WO2011004480A1 - スピーカ装置用磁気回路及びスピーカ装置 - Google Patents
スピーカ装置用磁気回路及びスピーカ装置 Download PDFInfo
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- WO2011004480A1 WO2011004480A1 PCT/JP2009/062483 JP2009062483W WO2011004480A1 WO 2011004480 A1 WO2011004480 A1 WO 2011004480A1 JP 2009062483 W JP2009062483 W JP 2009062483W WO 2011004480 A1 WO2011004480 A1 WO 2011004480A1
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- WIPO (PCT)
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- voice coil
- speaker device
- magnetic
- vibration direction
- diaphragm
- Prior art date
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
Definitions
- the present invention relates to a magnetic circuit for a speaker device and a speaker device.
- a dynamic speaker device As a general speaker device, a dynamic speaker device is known (see, for example, Patent Document 1). As shown in FIG. 1, for example, the dynamic speaker device is joined to a frame 3J, a cone-shaped diaphragm 21J, an edge 4J that supports the diaphragm 21J on the frame 3J, and an inner peripheral portion of the diaphragm 21J.
- the voice coil bobbin 610J, the damper 7J that supports the voice coil bobbin 610J on the frame 3J, the voice coil 611J wound around the voice coil bobbin 610J, the yoke 51J, the magnet 52J, and the plate 53J, and the voice coil 611J are arranged. And a magnetic circuit in which a magnetic gap is formed.
- the voice coil bobbin 610J vibrates due to the Lorentz force generated in the voice coil 611J in the magnetic gap, and the diaphragm 21J is driven by the vibration.
- the general dynamic speaker device described above has a voice coil 611J disposed on the side opposite to the acoustic radiation side of the diaphragm 21J, and vibration directions of the voice coil 611J and the voice coil bobbin 610J. And the vibration direction of the diaphragm 21J is the same.
- the region for vibrating the diaphragm 21J, the region for vibrating the voice coil bobbin 610J, the region where the magnetic circuit is disposed, and the like along the vibration direction (acoustic radiation direction) of the diaphragm 21J.
- the overall height of the speaker device must be relatively large.
- the size of the diaphragm 21J of the speaker device along the vibration direction is the same as the size of the cone-shaped diaphragm 21J along the vibration direction and the diaphragm 21J is supported by the frame 3J.
- the magnetic circuit mainly includes a magnet height (d) corresponding to a height from the upper surface of the yoke 51J to the yoke 51J, and the yoke 51J mainly includes a thickness (e) of the magnetic circuit.
- the vibration direction of the voice coil bobbin 610J and the vibration direction of the diaphragm 21J are the same direction, if the amplitude of the diaphragm 21J is increased to obtain a large volume, In order to ensure the vibration stroke of the voice coil bobbin 610J, the overall height of the speaker device becomes large, and it is difficult to achieve thinning of the device. That is, there is a problem that it is difficult to achieve both a reduction in device thickness and an increase in volume.
- the present invention is an example of a problem to deal with such a problem. That is, it is possible to provide a thin speaker device that can emit a large volume of reproduction sound with a relatively simple structure, a flat voice coil that can achieve a thin speaker device, and a thin voice device that drives the voice coil It is an object of the present invention to obtain an improved magnetic circuit.
- the speaker device includes at least a configuration according to the following independent claims.
- a magnetic circuit for a speaker device that is used in a speaker device that transmits vibration of a planar voice coil to a diaphragm via a rigid vibration direction converter, and that vibrates the voice coil in a plane.
- a first magnetic pole comprising a plurality of magnetic gaps arranged in a vibration direction of the voice coil, and a magnetic pole surface on one side partitioned by the voice coil facing the plurality of magnetic gaps is made of a magnetic material including a magnet
- a second magnetic pole surface composed of a plate-like magnetic body magnetically joined to the magnet, and the plate-like magnetic body includes the magnetic body forming the first magnetic pole surface;
- the second magnetic pole surface are formed in a stepped shape so that the first magnetic pole surface and the second magnetic pole surface have substantially the same height. circuit.
- FIG. 5 (a) is a side view
- FIG.5 (b) is a perspective view
- FIG.5 (c) is an A section enlarged view).
- FIG. 15 shows a different magnetic circuit for the sake of easy understanding. Is the same.
- FIG. 2 [Basic configuration of speaker device; FIG. 2] 2A and 2B are explanatory views showing the basic configuration of the speaker device according to the embodiment of the present invention (FIG. 2A is a cross-sectional view along the X-axis direction, and FIG. 2B shows the operation of the drive unit). Explanatory drawing).
- the speaker device 1 includes a diaphragm 10, a stationary unit 100 that supports the diaphragm 10 so as to freely vibrate along a vibration direction, a driving unit 14 that is provided in the stationary unit 100 and that vibrates the diaphragm 10 with an audio signal.
- the drive unit 14 includes a magnetic circuit 20 that forms a magnetic gap 20G, a voice coil 30 that receives an audio signal and vibrates in a direction different from the vibration direction of the diaphragm 10, and the direction of vibration of the voice coil 30.
- a vibration direction conversion unit 50 that converts and transmits the vibration to the diaphragm 10 is provided.
- the voice coil 30 is supported by the voice coil support unit 40, but the voice coil 30 itself may be connected to the vibration direction conversion unit 50.
- the vibration direction of the voice coil 30 is defined as the X-axis direction, and the two directions orthogonal thereto are defined as the Y-axis direction and the Z-axis direction, respectively.
- the diaphragm 10 may have a substantially rectangular shape in plan view, a circular shape, an elliptical shape, or other shapes.
- the cross-sectional shape of the diaphragm 10 can be formed in a predetermined shape such as a flat plate shape, a dome shape, or a cone shape, for example.
- the cross-sectional shape of the diaphragm 10 is a plane, but may be a curved shape.
- the overall height of the diaphragm 10 may be made relatively small, and the speaker device 1 may be thinned.
- the stationary part 100 is a general term for parts that support vibrations such as the vibration plate 10 and the drive part 14.
- the stationary part 100 includes a frame 12, a yoke part that also functions as the frame 12, and a later-described yoke part and mounting unit. It hits.
- the stationary part 100 is not intended to be completely stationary per se, but is entirely oscillated under the influence of the vibration of the driving part 14 or other force. Also good.
- the outer peripheral portion of the diaphragm 10 is supported by a frame 12 that is a stationary portion 100 via an edge 11.
- the drive unit 14 includes a magnetic circuit 20, a voice coil 30, and a vibration direction conversion unit 50.
- the voice coil 30 vibrates in a uniaxial direction along the magnetic gap 20G of the magnetic circuit 20, and the vibration is converted into a vibration direction conversion unit. 50 changes its direction and transmits it to the diaphragm 10.
- the voice coil 30 vibrates along the X-axis direction, and the diaphragm 10 is arranged so as to vibrate in the Z-axis direction perpendicular to the X-axis direction.
- the diaphragm 10 is vibrated in the Z-axis direction by converting the vibration in the direction into a changing oblique angle.
- the magnetic circuit 20 includes a magnet 21 (21A, 21B) and a magnetic pole member (yoke part) 22 (22A, 22B) so that a plurality of magnetic gaps 20G are arranged along the vibration direction (for example, the X-axis direction) of the voice coil 30. It has.
- the magnetic pole directions of the magnets 21 (21A, 21B) are set so that the magnetic field directions of the pair of magnetic gaps 20G are opposite to each other ( ⁇ Z-axis direction), and the magnetic gaps having magnetic fields in the opposite directions.
- a direction along the magnetic gap 20G ( ⁇ X-axis) is arranged in the voice coil 30.
- Direction) driving force (Lorentz force, electromagnetic force).
- the arrangement relationship between the magnet 21 and the magnetic pole member (yoke part) 22 is not limited to the illustrated example.
- the voice coil 30 is formed by winding a conducting wire (conductive member) to which an audio signal is input, and is itself arranged so as to be able to vibrate on the stationary part 100 or the stationary part 100 via the voice coil support part 40. Is arranged so as to freely vibrate.
- the voice coil support portion 40 can be formed of, for example, a flat insulating member, and the voice coil 30 is supported on the surface or inside thereof. By forming the voice coil support portion 40 with, for example, a flat insulating member, rigidity (including bending rigidity and torsional rigidity) can be added to the entire voice coil 30.
- the flat insulating member serving as the voice coil support portion 40 has a plurality of conductive layers formed on the outer side of the conducting wire.
- This conductive layer (voice coil lead wire) 32 (see FIG. 21) is electrically connected to a lead wire 31 (see FIG. 21) drawn from the start point and end point of the conducting wire.
- This lead line 31 (refer FIG. 21) is comprised by a part of electrically-conductive member mentioned later, for example. Further, it is electrically connected to the outside via a holding unit 15 (see FIG. 21) described later, and functions as a relay line for inputting a voice signal from the outside to the voice coil 30.
- a holding unit 15 see FIG. 21 described later
- the voice coil 30 and the voice coil support portion 40 are formed in a flat plate shape, but are not limited to this, and may be formed in a cylindrical shape.
- the vibration direction conversion portion is connected to the end portion on the vibration direction conversion portion 50 side so that the angle can be changed. You may attach the flat cover part which makes it possible.
- the voice coil 30 is held on the stationary part 100 by a holding part (not shown).
- the holding unit is configured to hold the voice coil 30 or the voice coil support unit 40 so as to freely vibrate along the vibration direction (for example, the X-axis direction) with respect to the stationary unit 100 and to prevent the voice coil 30 or the voice coil support unit 40 from moving in other directions.
- the holding portion can be deformed along the vibration direction (for example, the X-axis direction) of the voice coil 30, and can be formed by a curved plate member having rigidity in a direction crossing the vibration direction.
- the voice coil 30 is relatively large when driving the speaker by making the length of the voice coil in the direction orthogonal to the vibration direction of the voice coil 30 relatively large compared to the length of the voice coil 30 in the vibration direction. A driving force can be obtained.
- the vibration direction conversion part 50 is formed at the both ends of the link part 51 and the rigid link part 51 that is obliquely provided so that the angle can be freely changed between the voice coil 30 or the voice coil support part 40 and the diaphragm 10.
- the joint part 52 used as the fulcrum of the angle change of the conversion part 50 is provided.
- the connecting portion 53 of the vibration direction conversion unit 50 is, for example, an adhesive as a bonding member or both surfaces of the vibration plate 10 or the voice coil 30 or the attached member 200 including other members than the vibration plate 10 and the voice coil 30. They are connected by a connecting member such as a tape or a screw as a fastening member, and the joint portion 52 is arranged so as to be close to the attached member 200.
- the connecting portion 53 (53A) at one end of the vibration direction changing portion 50 is connected to the voice coil 30 or the voice coil support portion 40 via the connecting portion 60, but directly without using the connecting portion 60. You may connect.
- the connecting portion 60 is formed between the end portion on the voice coil side of the vibration direction converting portion 50 and the end portion on the vibration direction changing portion side of the voice coil 30 or the voice coil support portion 40, and both ends thereof in the vibration direction. They are connected at intervals along the line.
- the connection part 60 absorbs the thickness of the magnetic circuit 20, and is aiming at thickness reduction of a speaker apparatus.
- a contact avoiding portion 70 that avoids contact with the joint portion 52 is formed on the surface side of the attached member 200 adjacent to the joint portion 52 of the vibration direction changing portion 50.
- the contact avoiding portion 70 also functions as a joining member restraining portion that restrains the joining member that joins the vibration direction changing portion 50 and the attached member 200.
- the contact avoiding portion 70 is formed in a concave shape along the joint portion 52, for example, a concave portion, a notch portion, a groove portion or the like, and the joint portion 52 and the surface of the attached member 200 disposed in the vicinity of the joint portion 52.
- a predetermined space is formed between the joint portion 52 and the adhesive member interposed between the vibration direction changing portion 50 and the attached member 200.
- a notch 71 is formed as a contact avoidance portion 70 in the connecting portion 60 to be the attached member 200 so as to be close to the joint portion 52 (52A), and a recess 72 is provided as the contact avoidance portion 70 in the diaphragm 10. It forms so that it may adjoin to joint part 52 (52B).
- a bonding member such as an adhesive or a double-sided tape
- the adhesive protrudes toward the joint part 52.
- the end portion of the double-sided tape enters the cutout portion 71 or the concave portion 72 so as not to contact and adhere to the joint portion 52.
- such a speaker device 1 inputs a voice signal SS as an electrical signal to the voice coil 30 of the drive unit 14, thereby providing a magnetic signal as shown in FIG.
- the voice coil 30 or the voice coil support portion 40 vibrates in the X-axis direction shown in the figure along the magnetic gap 20G of the circuit 20, for example.
- the vibration is changed in direction by the vibration direction converter 50 and transmitted to the diaphragm 10, and the diaphragm 10 is vibrated in, for example, the Z-axis direction shown in FIG. A corresponding sound is emitted.
- the voice coil 30 is moved along the vibration direction of the diaphragm 10.
- the back side of the diaphragm 10 can be made thinner. As a result, a thin speaker device capable of reproducing the low sound range with high sound pressure can be obtained.
- the speaker device 1 can be increased even if the amplitude of the diaphragm 10 is increased by increasing the amplitude of the voice coil 30.
- the thickness in the acoustic radiation direction does not increase. This makes it possible to obtain a thin speaker device that can emit a large volume of reproduced sound.
- the adhesive diffuses and extends with the joining and protrudes toward the joint portion 52.
- the joint portion 52 may harden and become unable to move.
- the joint portion 52 may harden and become inoperable. There is. Further, the joint portion 52 that has been cured by adhering an adhesive or an end portion of a double-sided tape may be broken due to repeated bending, refraction, or rotational movement.
- the portion where the adhesive or the end of the double-sided tape is attached contacts or leaves the attached member 200 such as the diaphragm 10, the voice coil 30, or other members. Repeatedly, an abnormal sound (a hit sound) is generated each time.
- the vibration direction changing portion 50 and the attached member 200 are reduced. There is a problem that the coupling force is reduced, and peeling or the like occurs from the end surface, resulting in abnormal noise, or even complete peeling that leads to destruction of the speaker.
- the joint portion 52 is disposed in the vicinity of the attached member 200, the joint portion 52 comes into contact with the attached member 200, the joint portion 52 is damaged, or the vibration direction changing portion 50 is attached to the attached member. In some cases, bending, refraction, or rotational movement with respect to 200 cannot be performed. However, in this speaker device 1, since the contact avoiding portion 70 is formed on the surface side of the mounted member 200 close to the joint portion 52, the contact with the joint member 52 is suppressed and abnormal noise is generated due to the contact. Can be suppressed.
- a bonding member such as an adhesive or a double-sided tape used to connect the connecting portion 53 of the vibration direction changing portion 50 and the attached member 200 protrudes, a contact avoiding portion that functions as a bonding member restraining portion. It is possible to prevent the movement of the joint portion 52 from being blocked by entering the 70 and adhering to the joint portion 52. As a result, the function of the joint portion 52 can be maintained while maintaining a high coupling force between the vibration direction converter 50 and the attached member 200. Since the vibration direction converter 50 reliably bends, refracts, or rotates with respect to the attached member 200, contact of the joint portion 52 to the attached member 200 due to breakage, generation of abnormal noise, and the like can be suppressed.
- FIGS. 3 to 14 are explanatory diagrams for explaining a configuration example and operation of the vibration direction converter 50.
- the rigid vibration direction conversion unit 50 that changes the direction of the vibration of the voice coil 30 and transmits the vibration to the vibration plate 10 forms joint portions 52 on the vibration plate 10 side and the voice coil 30 side in the vibration direction of the voice coil 30. It has the link part 51 inclined with respect to it.
- the joint part 52 is a part that rotatably joins two rigid members, or a part that refracts or bends two integrated rigid parts.
- the joint portion 52 is a rigid portion formed at the end.
- the rigidity means that the vibration of the voice coil 30 is not deformed to such an extent that it can be transmitted to the diaphragm 10, and does not mean that it does not deform at all.
- the link portion 51 can be formed in a plate shape or a rod shape.
- one link portion 51 is provided, joint portions 52 (52A, 52B) are formed at both ends thereof, and one joint portion 52A is an end portion of the voice coil 30 or the voice coil support portion 40.
- the other joint portion 52B is formed on the diaphragm 10 side.
- the other joint portion 52B may be connected to the diaphragm 10 or may be connected to the diaphragm 10 via another member.
- a known member can be used.
- a metal member that improves the joint strength between the joint portion 52 and the diaphragm 10 may be selected (the diaphragm 10 is not shown in FIG. 3). is doing).
- FIG. 5A shows a case where the link portion 51 is at an intermediate position of vibration.
- the link portion 51 is obliquely provided at an angle ⁇ 0 between the voice coil 30 (or the voice coil support portion 40) and the diaphragm 10.
- the joint portion 52B on the diaphragm 10 side is disposed at a position Z 0 away from the voice coil 30 by a distance H 0 along the vibration direction of the diaphragm 10.
- the vibration direction of the voice coil 30 (or the voice coil support portion 40) is regulated so as to vibrate in one axial direction (for example, the X-axis direction), and the vibration direction of the diaphragm 10 is different from the vibration direction of the voice coil 30.
- the vibration direction is regulated so as to vibrate (eg, in the Z-axis direction).
- the position X 2 to move is formed on the end portion of the voice coil 30 joint portion 52A from the initial position X 0 to the vibration direction (-X axis direction) by [Delta] X 2 reaches Then, the inclination angle of the link portion 51 is converted to ⁇ 2 ( ⁇ 0 ⁇ 2 ), and the position of the joint portion 52B on the vibration plate 10 side is ⁇ Z 2 in the vibration direction ( ⁇ Z axis direction) of the vibration plate 10. move and reaches the position Z 2. That is, the diaphragm 10 is pushed down along the vibration direction by ⁇ Z 2 .
- the function of the vibration direction conversion unit 50 including the link part 51 and the joint part 52 converts the vibration of the voice coil 30 into the obliquely changing angle of the link part 51 and transmits it to the diaphragm 10.
- the vibration plate 10 is caused to vibrate in a direction different from the vibration direction of the voice coil 30.
- FIG. 4 is an explanatory diagram for explaining another configuration example of the vibration direction conversion unit 50 and its operation. More specifically, FIG. 5B shows the state of the vibration direction converter 50 in a state where the diaphragm 10 is located at the reference position, and FIG. FIG. 6C shows the state of the vibration direction conversion unit 50 in a state where the vibration plate 10 is displaced in the opposite direction with respect to the acoustic radiation side with respect to the reference position. (The diaphragm 10 is not shown).
- the vibration direction conversion section 50 has a function of converting the angle by receiving a reaction force from the stationary section 100 such as the frame 12 where the link portion 51 is located on the opposite side to the diaphragm side.
- the vibration direction converter 50 includes a first link portion 51A having one end as a joint portion 52A on the voice coil 30 side and the other end as a joint portion 52B on the diaphragm 10 side, and one end as a first link portion. 51 and a second link portion 51B having the other end as a joint portion 52D with the stationary portion 100.
- the first link portion 51A and the second link portion 51B are voiced.
- the coils 30 are inclined in different directions with respect to the vibration direction of the coil 30.
- the vibration direction conversion unit 50 includes a first link portion 51A having one end as a first joint portion 52A on the voice coil 30 side and the other end serving as a second joint portion 52B on the diaphragm 10 side, A second link portion 51B having one end as a third joint portion 52C with the intermediate portion of the first link portion 51A and the other end as a fourth joint portion 52D with the stationary portion 100;
- the joint portion 52A, the second joint portion 52B, and the fourth joint portion 52D are on a circumference having a diameter substantially equal to the length of the first link portion 51A centered on the third joint portion 52C. It is in.
- the joint portion 52 ⁇ / b> D is the only joint portion whose position does not change and is supported by the stationary portion 100 (or the frame 12), and applies a reaction force from the stationary portion 100 to the link portion 51. ing.
- the voice coil 30 or the voice coil support section 40
- ⁇ X 1 in the X-axis direction from the reference position X 0
- the link part 51A and the second link part 51B rise substantially at the same angle, and the joint part 52B receives the reaction force from the stationary part 100 at the joint part 52D, and the joint part 52B reliably moves the diaphragm 10 to the reference position Z 0.
- the length a of the link part from the joint part 52A to the joint part 52C, the length b of the link part from the joint part 52C to the joint part 52B, and the length c of the link part from the joint part 52C to the joint part 52D. are substantially equal, and the joint portion 52A and the joint portion 52D are preferably disposed substantially parallel to the moving direction of the voice coil 30.
- the angle formed by the straight line passing through the joint part 52A and the joint part 52D and the straight line passing through the joint part 52B and the joint part 52D are at right angles.
- the joint portion 52B between the first link portion 51A and the diaphragm 10 moves along the Z-axis perpendicular to the X-axis.
- Can be transmitted to the diaphragm 10 by converting the vibration direction thereof into a direction perpendicular thereto.
- the vibration direction converter 50 includes the link portion 51 and joint portions 52 (52A, 52B) formed at both ends thereof.
- connection portions 53 (a first connection portion 53A and a second connection portion 53B) are formed on both ends of the link portion 51 via joint portions 52.
- the first connecting portion 53A is a portion that is connected to the voice coil 30 or the voice coil support portion 40 directly or via another member and vibrates integrally with the voice coil 30, and the second connecting portion 53B. Is a portion that is connected to the diaphragm 10 directly or via another member and vibrates integrally with the diaphragm 10.
- the link portion 51, the joint portions 52A and 52B, and the first and second connection portions 53A and 53B are integrally formed, and the joint portions 52A and 52B include the joint portions 52A and 52B.
- the continuous member may be a member that forms the entirety of the link portion 51 and the first and second connection portions 53A and 53B, or the link portion 51 and the first and second connection portions 53A and 53B.
- the member which forms a part of may be sufficient.
- the joint portion 52 is formed in a linear shape extending in the width direction as shown in FIG. Further, since the link portion 51 is required to have a rigidity that does not deform, and the joint portion 52 is required to be refractable, the thickness of the joint portion 52 with respect to the thickness t1 of the link portion 51 or the connecting portion 53. By forming the thickness t2 in a thin shape, the integral member has different properties.
- the change in thickness between the joint portion 52 and the link portion 51 is formed in an inclined surface shape, and inclined surfaces 51t and 53t whose surfaces face each other at the end portions on both sides of the joint portion 52 are formed. Thereby, when the angle of the link portion 51 is changed, the thickness of the link portion 51 can be prevented from interfering with the angle change.
- the contact avoiding portion 70 is a recess or notch 71, and in the example shown in FIG.
- a space is formed between the joint portion 52A and the connecting portion 60.
- the diaphragm 10 of the mounted member 200 disposed in the vicinity of the joint portion 52B is formed with a concave portion or notch portion 72 as the contact avoiding portion 70, and a concave portion having a curved cross section in the illustrated example.
- a space is formed between the joint portion 52B and the diaphragm 10.
- the adhesive is bonded to the joint portions 52A, Even if it protrudes toward 52B, it enters the recess or notch 71, 72, so it does not adhere to the joint portions 52A, 52B, and even if attached, it is only a portion that is not a joint (a portion having rigidity that does not bend or bend). The hindrance to the bending operation or the bending operation of the joint portions 52A and 52B can be suppressed.
- a rigid member is integrated with a refracting continuous member to form a link portion or a connecting portion, and the joint portion is a portion constituted by a continuous member.
- a rigid member 50Q is attached to the surface of a continuous member 50P, which is a bendable sheet-like member, to form a link portion 51 or a connecting portion 53.
- the continuous member 50P is continuously extended in the part of the both sides straddling the joint part 52, and the joint part 52 is substantially formed only by the continuous member 50P so that bending is possible.
- the link portion 51 or the connecting portion 53 in which the rigid member 50Q is attached to the continuous member 50P is formed in a portion having rigidity.
- the link member 51 or the connecting member 53 is formed by attaching the rigid member 50Q so as to sandwich the continuous member 50P. Again, the portion where the rigid member 50Q is not attached becomes the joint portion 52.
- the rigid member forming the link portion 51 is formed in a multilayer by laminating the rigid members 50Q1 and 50Q2. Furthermore, in the same figure (c), you may make the rigid member 50Q1 or the rigid member 50Q2 into a multilayer structure. In this way, by partially attaching the rigid member 50Q to the refracting continuous member 50P, the refracting joint portion 52, the rigid link portion 51, and the connecting portion 53 can be integrally formed.
- the continuous member 50P is preferably strong and durable enough to withstand the refraction of the joint portion 52 repeated when the speaker device is driven, and flexible so that no sound is emitted when the refraction operation is repeated.
- the continuous member 50P can be formed of a woven or non-woven fabric of high-strength fibers.
- woven fabrics include plain weaves of uniform materials, plain weaves with different warp and weft yarns, plain weaves with different yarn materials alternately, plain weaves with twisted yarns, flat weaves of assortment, etc.
- the high-strength fiber When all or part of the high-strength fiber is used, the high-strength fiber is arranged along the vibration direction of the voice coil support portion 40, which is sufficient for the vibration of the voice coil 30 or the voice coil support portion 40. Strength can be obtained. When warp and weft are both high-strength fibers, both the warp and wefts are evenly tensioned by tilting the fiber direction by approximately 45 ° with respect to the vibration direction of the voice coil support section 40 to improve durability. Can be made. As the high-strength fiber, an aramid fiber, a carbon fiber, a glass fiber, or the like can be used. Further, in order to adjust physical properties such as bending stress and rigidity of the continuous member, a dumping agent (damping agent, braking material) may be applied (applied).
- a dumping agent damping agent, braking material
- the rigid member 50Q is preferably lightweight, easy to mold and rigid after curing, and thermoplastic resin, thermosetting resin, metal, paper, or the like can be used. After the rigid member 50Q is formed into a plate shape, the vibration direction changing portion 50 can be formed by sticking the surface of a portion excluding the joint portion 52 of the continuous member 50P with an adhesive as a bonding agent. When a thermosetting resin is used as the rigid member 50Q, the vibration direction changing portion 50 is formed by partially impregnating the resin in the link portion 51 and the connecting portion 53 of the fibrous continuous member 50P and then curing the resin. can do. When resin or metal is used as the rigid member 50Q, the continuous member 50P and the rigid member 50Q can be integrated in the link portion 51 and the connecting portion 53 by insert molding.
- FIG. 7 and 8 are explanatory views showing a speaker device employing the above-described vibration direction converter
- FIG. (b) is an explanatory view showing the operation of the drive unit.
- the first connecting portion 53A that is connected to the voice coil support portion 40 and vibrates integrally with the voice coil support portion 40, and is connected to the diaphragm 10 and vibrates.
- a link mechanism 50 ⁇ / b> L including a second connecting portion 53 ⁇ / b> B that vibrates integrally with the plate 10 and including a plurality of link portions is formed.
- the vibration direction converter 50 is formed by a link mechanism 50L including a rigid first link portion 51A and a second link portion 51B.
- the first link portion 51A has a first connection portion 53A formed on one end side via a joint portion 52A, and a second connection portion 53B formed on the other end side via a joint portion 52B.
- the second link portion 51B is formed with an intermediate portion of the first link portion 51A via a joint portion 52C on one end side, and does not move against vibration of the voice coil support portion 40 via the joint portion 52D on the other end side.
- the connecting portion 53C is formed.
- the first connecting portion 53A is connected to the end of the voice coil support portion 40 via the connecting portion 60 or directly, and the second connecting member 53B is directly connected to the diaphragm 10.
- the stationary connection portion 53 ⁇ / b> C is connected to the bottom portion 12 ⁇ / b> A of the frame 12 that becomes the stationary portion 100.
- the first link portion 51 ⁇ / b> A and the second link portion 51 ⁇ / b> B are inclined in different directions with respect to the vibration direction (X-axis direction) of the voice coil support portion 40, and the stationary portion 100 is in relation to the vibration direction conversion portion 50. It is provided on the side opposite to the diaphragm 10 side.
- the stationary portion 100 is formed by the bottom portion 12A of the frame 12, but instead, the yoke portion 22A of the magnetic circuit 20 extends below the vibration direction changing portion 50, and the yoke portion 22A is The stationary part 100 may be used.
- the joint portion 52A on the voice coil support portion 40 side moves in the X-axis direction as the voice coil support portion 40 moves, and the joint portion 52D connected to the stationary portion 100 is fixed.
- the movement of the joint portion 52A is converted into a changing angle between the first link portion 51A and the second link portion 51B by the reaction force received from the stationary portion 100, and the joint portion 52B on the diaphragm 10 side Is moved in the vibration direction of the diaphragm 10 (for example, the Z-axis direction).
- the speaker device 1B shown in FIG. 8 includes the drive units 14 shown in FIG. 7 arranged symmetrically facing each other, and includes drive units 14 (R) and 14 (L).
- R drive units 14 (R) and 14 (L).
- R drive units 14 (R) and 14 (L).
- R link mechanisms 50L (R), 50L (L), voice coil support portions 40 (R), 40 (L), magnetic circuits 20 (R), 20 (L), and connecting portions 60 ( R), 60 (L).
- the link mechanisms 50L (R) and (L) include a pair of first link portions 51A, a pair of second link portions 51B, a pair of first connection portions 53A, and a second connection portion that are arranged to face each other. 53B and the immovable connecting portion 53C are integrally formed to form the vibration direction changing portion 50.
- the pair of first connection portions 53A are respectively connected to the voice coil support portion 40, the second connection portion 53B is connected to the diaphragm 10, and the stationary connection portion 53C is connected to the bottom portion 12A of the frame 12.
- the two drive units 14 (R), 40 (R), 40 (L) are reversed by synchronizing the vibration directions of the voice coil support units 40 (R), 40 (L).
- the diaphragm 10 can be vibrated by combining the driving force of 14 (L). Further, since the joint portion 52B on the diaphragm 10 side can be provided at a plurality of locations, the support points of the diaphragm 10 are increased, and the vibration phase of the diaphragm 10 can be matched.
- FIG. 9 and 10 are explanatory views showing a more specific vibration direction converting portion
- FIG. 9A is a perspective view
- FIG. 9B is an enlarged view of a portion A in FIG. 9A
- FIG. 10 (a) is a plan view of a state in which the joint portion is stretched and the whole is flattened
- FIG. 10 (b) is a side view of a state in which the joint portion is stretched and the whole is flattened.
- the vibration direction changing part 50 is formed by one integrated part, and as described above, the pair of first link parts 51A and the joint parts 52A and 52B are formed at both ends thereof, and the pair of first link parts 51A and 52B are formed.
- Two link portions 51B and joint portions 52C and 52D are formed at both ends thereof. Further, a first connection portion 53A is formed on one end side of the pair of first link portions 51A via a joint portion 52A, and the joint portions 52B formed on the other end side of the pair of first link portions 51A. A second connecting portion 53B is formed, and a stationary connecting portion 53C is formed between the joint portions 52D formed on the other end side of the second link portion 51B.
- the first link portions 51A and 51A and the second connection portion 53B are refracted in a convex shape, and the second link portions 51B and 51B and the stationary connection portion 53C are refracted in a concave shape.
- the joint portion 52A is formed to be refracted by the above-described continuous member 50P, and the above-described rigid member 50Q is attached to the first link portion 51A, so that the first connecting portion.
- the above-described rigid member 50Q is also attached to 53A.
- all the joint parts mentioned above are formed in the same composition.
- inclined surfaces 51t and 53t are formed to face each other.
- the vibration direction changing portion 50 including the link portions 51A and 51B, the joint portions, and the connecting portions 53A, 53B, and 53C is formed from an integral sheet-like component.
- the joint portion 52A is formed so as to linearly cross the integral sheet-like component, and the joint portions 52B, 52C, 52D are formed so as to partially traverse the integral sheet-like component.
- the second link portions 51B and 51B and the stationary connection portion 53C are cut out by forming a pair of cutout portions 50S along the longitudinal direction of the integral sheet-like component.
- a resin material for forming the rigid member 50Q is applied to the entire surface of the continuous member 50P that is a sheet-like member.
- V-shaped die cutting is performed. Thereafter, the above-described notch 50S is formed, and the resin material is cured.
- the resin material used here a liquid uncured resin material or a resin film can be used.
- the rigid member 50Q may be formed simultaneously with the resin material. At this time, it is preferable that a groove or a recess having a V-shaped cross section is formed in advance in a mold for molding the rigid member 50Q.
- FIGS. 11A and 13 are explanatory diagrams illustrating another example of the vibration direction converter 50 (FIG. 11A is a side view, FIG. 11B is a perspective view, and FIG. 12 is an operation explanatory diagram).
- FIGS. 13A and 13B are explanatory diagrams of formation examples.
- This vibration direction conversion part 50 (link mechanism 50L) is a case where a pair of drive parts are provided and the vibration direction conversion parts 50 are arranged opposite to each other substantially symmetrically, and a parallel link is formed by a plurality of link portions. Yes.
- the vibration direction converter 50 has one end as a joint portion 52A (R), 52A (L) with the first connection portion 53A (R), 53A (L) and the other end as a joint with the second connection portion 53B.
- a pair of first link portions 51A (R) and 51A (L) are provided as portions 52B (R) and 52B (L).
- one end is a joint part 52C (R), 52C (L) with the intermediate part of the first link parts 51A (R), 51A (L), and the other end is a joint part 52D ( R) and 52D (L) have a pair of second link portions 51B (R) and 51B (L).
- the first connecting portion 53A is connected to the voice coil 30 or the voice coil support portion 40 directly or via the connecting portion 60 as another member, and the second connecting portion 53B is connected to the diaphragm 10.
- the stationary connection portion 53 ⁇ / b> C is connected to the bottom portion 12 ⁇ / b> A of the frame 12 that becomes the stationary portion 100, the yoke portion 22 that forms the magnetic circuit 20, and the like.
- Such a link mechanism 50L of the vibration direction changing section 50 has a function of combining the link mechanism of the embodiment shown in FIG. 7 and the parallel link mechanism, and each link portion and the connecting portion are connected to the continuous member 50P.
- the rigid members 50Q are integrally formed with each other, the joint portions between the link portions are formed in a linear shape by a refracting continuous member 50P, and the link portions are formed integrally with each other via the joint portions. Yes.
- the second connecting portion 53B disposed in the vicinity of the joint portions 52F (R) and 52F (L) and the pair disposed in the vicinity of the joint portions 52A (R) and 52A (L).
- a recess 76 is formed as the contact avoiding portion 70 so that a space is formed between each joint portion and the connecting portion.
- this vibration direction converter 50 will be described with reference to FIG.
- the stationary connection portion 53 ⁇ / b> C supported by the frame 12 functions as the stationary portion 100.
- the second is performed by the parallel link mechanism.
- the first link portions 51A (R), (L) and the third link portions 51C (R) forming the parallel links are raised while maintaining the parallel connection portion 53B and the connection portion 53E integrated therewith in a parallel state. ), (L) is changed so that the angle rises.
- the first link portion 51A (R) receives the reaction force from the stationary portion.
- (L) and the third link portions 51C (R), (L) are reliably changed, and the displacement of the joint portions 52A (R), (L) from the position X0 to the position X1 is determined by the diaphragm 10. Is reliably converted into a displacement from the position Z0 to the position Z1.
- the angle of the portions 51C (R) and (L) is reliably changed, and the displacement of the joint portions 52A (R) and (L) from the position X0 to the position X2 is changed from the position Z0 to the position Z2 of the diaphragm 10. Hence convert to
- (L) and the second connecting portion 53B are converted into vibrations in the Z-axis direction.
- the diaphragm 10 is supported in a wide range and is provided with vibrations having substantially the same phase and substantially the same amplitude. Therefore, the vibration of the voice coil support unit 40 with respect to the planar diaphragm 10 having a large area is provided. Can be transmitted in substantially the same phase.
- the vibration direction converter 50 has the connecting portions 53B, 53D (R), (L), and the third link portions 51C (R), (L) parallel to a pair in the width direction.
- the first link portions 51A (R) and (L) are formed in a bifurcated manner, and the joint portions 52C (R) and the second link portions 51B (R) and (L) are formed at intermediate portions thereof.
- (L) is formed, and the second link portions 51B (R), (L) and the connecting portion 53C are connected in parallel in a pair in the width direction 53B, 53D (R), (L), third. Between the link portions 51C (R) and (L).
- the link portion By forming the link portion with a single sheet-like (plate-like) component in this way, the diaphragm 10 can be supported and vibrated on the surface, so that the entire diaphragm 10 can be vibrated substantially in phase. It is possible to suppress divided vibration.
- the vibration direction converter 50 of this embodiment refracts the entire plate-like member forming the link portion into a convex shape so that the first link portion 51A (R). , (L) and the second connecting portion 53B are formed, and the plate-like member is partially cut out and refracted into a concave shape so as to be fixed to the second link portions 51B (R), (L). 53C is formed.
- the vibration direction changing portion 50 is formed by bonding a plurality of (two) sheet-like (plate-like) parts 501, 502, In the sheet-like component 501, the first connecting portions 53A (R), (L), the first link portions 51A (R), (L), the second link portions 51B (R), (L), second The connecting portion 53B and the stationary connecting portion 53C are formed, and the connecting portion 53D, the third link portions 51C (R) and (L), and the connecting portion 53E are formed on the other sheet-like component 502.
- the connecting portions 53D (R), (L) and the third link portions 51C (R), (L) are connected along the first link portions 51A (R), (L) and the second connecting portion 53B.
- the sheet-like component 502 is formed with an opening 502A corresponding to the second link portions 51B (R) and (L) and the stationary connection portion 53C.
- the size of the opening 502A formed in the other sheet-like component 502 corresponding to the second link portions 51B (R), (L) and the stationary connection portion 53C in one sheet-like component 501 is as follows.
- the other sheet-like component 502 is formed so as to expand from one end to the inside. By doing so, the second link portions 51B (R), (L) and the immovable connecting portion 53C are prevented from coming into contact with other sheet-like parts 502, and the link mechanism moves smoothly. Can be made.
- the two parts 501 and 502 are connected with the continuous member 50P facing each other.
- the continuous member 50P can be integrated and the joint portion 52 can be smoothly refracted.
- a recess or notch 76 is formed as a contact avoidance portion 70 at a location close to the joint portion 52.
- an inclined surface as shown in FIG. 5C is formed at the end of each link part.
- the inclined surfaces are formed so as not to interfere with each other when the link portion is refracted at the joint portion, so that the link portion can be efficiently refracted at the joint portion.
- the above-described sheet-like component 502 is formed integrally with the end of the above-mentioned sheet-like component 501, and the folding line f is formed in the direction of the arrow.
- the vibration direction converter 50 shown in FIGS. 11 and 12 can be obtained.
- a resin material for forming the rigid member 50Q is laminated on the entire surface of the continuous member 50P, which is a sheet-like member, to form each joint portion and inclined surfaces on both sides thereof. It can be easily formed by performing V-shaped die cutting as much as possible, and then forming the notch 50S and the opening 502A described above and curing the resin material.
- the rigid member 50Q may be formed simultaneously with the resin material. At this time, it is preferable that a groove or a recess having a V-shaped cross section is formed in advance in a mold for molding the rigid member 50Q.
- the link mechanism of the vibration direction conversion unit 50 can be formed by using one integral part for the two opposing voice coil support units 40. Therefore, the assembly work can be easily performed even when a speaker device including a pair of drive units is formed. Further, by providing the immovable connecting portion 53C, the joint portion 52D (particularly with respect to the opposing vibration of the voice coil support portion 40 (the plurality of voice coil support portions 40 vibrate in opposite directions to each other). Even if R) and (L) are not supported by the frame 12, the positions of the joint portions 52D (R) and (L) are held constant, and this also leads to the speaker device of the vibration direction conversion unit. Can be simplified.
- the right first link portion 51A (R) and the third link portion 51C (R), and the left first link portion are used as the link mechanism. Since the parallel link is formed by 51A (L) and the third link portion 51C (L), the second connecting portion 53B fixed to the diaphragm 10 against the opposing vibration of the voice coil support portion 40 is Z. It can be translated stably along the axial direction. As a result, it is possible to apply stable vibration to the planar diaphragm 10.
- the driving force of the magnetic circuit 20 or the vibration of the voice coil 30 is increased. Does not directly affect the size of the speaker devices 1, 1A, 1B in the thickness direction (Z-axis direction). Therefore, it is possible to reduce the thickness of the speaker devices 1, 1A, 1B while increasing the volume.
- the vibration direction conversion unit 50 converts the vibration direction of the voice coil support unit 40 and transmits it to the diaphragm 10 by a mechanical link mechanism, the vibration transmission efficiency is high.
- the angle change between the first link portion 51A and the second link portion 51B is caused by the vibration of the voice coil support portion 40 and the reaction force from the stationary portion 100.
- vibration from the voice coil support 40 can be transmitted to the diaphragm 10 more reliably. Thereby, good reproduction efficiency of the speaker devices 1A and 1B can be obtained.
- the position of the end 40 ⁇ / b> A of the voice coil 30 or the voice coil support unit 40 and the vibration direction conversion unit can be provided by providing the connecting unit 60.
- a step (interval) can be formed between the positions of the 50 end portions 50A.
- the width (height) of the magnetic circuit 20 in the Z-axis direction can be accommodated within the height of the vibration direction converter 50, and the height of the magnetic circuit 20 required for securing the driving force can be reduced.
- the speaker devices 1, 1 ⁇ / b> A, 1 ⁇ / b> B can be thinned while ensuring sufficient.
- the necessary height of the vibration direction converting portion 50 (the length of the link portion 51) can be sufficiently secured.
- the amplitude of the diaphragm 10 can be made relatively large.
- the vibration of the voice coil support 40 can be stabilized by forming the bottom 61 of the connecting portion 60 so as to slide on the bottom 12A of the frame 12 or the stationary portion 100 with a predetermined gap. Is possible.
- the movement of the end of the vibration direction converter 50 can be performed linearly, and the movement of the end of the vibration direction converter 50 connected to the diaphragm 10 can be reliably and stabilized.
- the vibration direction conversion unit 50 shown in FIG. 14 is an improved example of the form shown in FIG.
- the convex portion 510 is provided on the link portion where bending is likely to occur due to the opposing vibration of the voice coil support portion 40 to increase the rigidity.
- the first link portions 51A (R), (L), the second link portions 51B (R), (L), the connecting portions 53D (R), (L), and the connecting portions 53C are convex.
- a portion 510 is provided.
- an opening 520 is provided in a link portion that does not particularly require strength, thereby reducing the weight of the vibration direction changing portion.
- an opening 520 is provided in the connecting portion 53B.
- the weight reduction of the vibration direction converter is particularly effective in widening the reproduction characteristics and increasing the amplitude and sound pressure level of the sound wave for a predetermined audio current.
- [Magnetic circuit] 15 and 16 are explanatory views showing a magnetic circuit for a speaker device according to an embodiment of the present invention.
- the magnetic circuit 20 includes the magnet 21 and the magnetic pole member (yoke part) 22, and a plurality of magnetic gaps 20 ⁇ / b> G ⁇ b> 1 and 20 ⁇ / b> G ⁇ b> 2 disposed in the vibration direction of the voice coil 30 by the magnet 21 and the magnetic pole member 22. (30X in the figure is the center line of the voice coil 30).
- the magnetic circuit 20 includes a first magnetic pole surface 20X formed of a magnetic body including a magnet 21 on one side, which is partitioned by a voice coil 30 facing the plurality of magnetic gaps 20G1 and 20G2, and a magnetic And a second magnetic pole surface 20Y composed of a plate-like magnetic body (yoke portion 22) bonded to the magnetic body, and the plate-like magnetic body (yoke portion 22) forms a first magnetic pole surface 20X.
- the joining surface with the (magnet 21) and the second magnetic pole surface 20Y are formed in a step shape so that the first magnetic pole surface 20X and the second magnetic pole surface 20Y have substantially the same height.
- the yoke portion 22 which is a plate-like magnetic body is in a refracted state (including a bent state) in a sectional view, and the magnet 21 and the magnet A flat plate portion 22h1, an inclined portion 22t extending from the flat plate portion 22h1 to the second magnetic pole surface 20Y, and a flat plate portion 22h2 for forming the second magnetic pole surface 20Y.
- the first magnetic pole surface 20X is formed on a magnet 21 that is a magnetic body disposed on the flat plate portion 22h1.
- a third magnetic pole surface 20X1 and a fourth magnetic pole surface 20Y1 are formed in the other of the spaces partitioned by the voice coil 30.
- the third magnetic pole surface 20X1 is disposed opposite to the first magnetic pole surface 20X
- the fourth magnetic pole surface 20Y1 is disposed opposite to the second magnetic pole surface 20Y.
- the third magnetic pole surface 20X1 is composed of a magnetic body including the magnet 21, and the fourth magnetic pole surface 20Y1 is composed of a plate-shaped magnetic body (yoke portion 22).
- the other of the spaces partitioned by the voice coil 30 in the plurality of magnetic gaps 20G1, 20G2 is a plate disposed opposite to the first magnetic pole surface 20X and the second magnetic pole surface 22Y.
- a yoke portion 22 is provided.
- a plurality of magnetic gaps 20G1 and 20G2 form magnetic fields opposite to each other along a uniaxial direction (for example, the Z-axis direction), as shown in FIG.
- a voice coil 30 around which a conductive member is wound is disposed in the magnetic gaps 20G1 and 20G2 so as to intersect the magnetic field direction and so that a current flows in the opposite direction in each magnetic gap 20G1 and 20G2.
- a driving force (Lorentz force, electromagnetic force) is applied to the voice coil 30 in the magnetic field direction of the magnetic gaps 20G1 and 20G2 and the direction intersecting the current (for example, the X-axis direction).
- the voice coil 30 vibrates along the driving force.
- the magnetic flux density in the magnetic gap 20G1 formed by the first magnetic pole surface 20X and the third magnetic pole surface 20X1 is such that the magnetic gap 20G2 formed by the second magnetic pole surface 20Y and the fourth magnetic pole surface 20Y1.
- the vibration direction converter 50 is disposed on the magnetic gap 20G1 side and the end of the voice coil 30 and the vibration direction converter 50 are connected, the driving force of the voice coil 30 is large. Can be made relatively large.
- a magnetic body that becomes the magnet 21 and a magnetic body that becomes the yoke portion 22 are arranged as shown in FIG. 15A or 15B, and the magnetic body that becomes the magnet 21 in this arrangement state. Magnetize.
- FIG. 6A after the pair of magnets 21 and 21 are assembled in the magnetic circuit 20, they can be obtained by a single magnetization process. By reducing the number of times of magnetization, dust and the like can be prevented from entering the magnetic circuit 20, the reliability of the speaker device can be improved, and the manufacturing process can be simplified.
- the first magnetic pole surfaces 20X and 20X1 shown in FIG. 15 are composed of the magnet 21, but are sandwiched between, for example, the magnet 21 and the flat plate portion 22h1, or provided on the magnetic gap 20G1 side of the magnet 21.
- the first magnetic pole surface 20X composed of the magnetic body and the magnet 21 may be used.
- FIG. 16 is an explanatory view showing another configuration example of the magnetic circuit for the speaker device according to the embodiment of the present invention (FIG. 16 (a) is a plan view, and FIG. 16 (b) is an XX sectional view).
- FIG. 16 (a) is a plan view
- FIG. 16 (b) is an XX sectional view).
- the structure for forming the magnetic gaps 20G1 and 20G2 is the same as that of the example of FIG. 15 described above, but the yoke portion 22 which is a plate-like magnetic body has a plurality of protruding portions 22p.
- the plurality of protrusions 22p extend in directions opposite to each other along a direction (eg, the Y-axis direction) intersecting the vibration direction (eg, the X-axis direction) of the voice coil. Yes.
- one protrusion 22p (second protrusion 22p3) extends along the vibration direction of the voice coil 30.
- the plurality of protrusions 22p (22p1, 22p2, 22p3) function as locking protrusions for attaching the magnetic circuit 20 to the stationary part 100.
- the gaps in the magnetic gaps 20G1 and 20G2 can be made substantially constant along the vibration direction of the voice coil 30. Therefore, the uniformity of the magnetic flux density in the magnetic gaps 20G1 and 20G2 can be improved.
- FIG. 17 is a plan view of the speaker device according to the embodiment of the present invention, and FIG. 18 is a rear view thereof.
- the speaker device 1B shown in FIG. 8 is used as a basic configuration, and a speaker device equipped with the magnetic circuit 20 shown in FIG.
- the diaphragm 10 is formed in a rectangular shape viewed from the sound radiation direction, and has an elliptical outer shape near the center and a curved portion 10 ⁇ / b> A having a concave cross-sectional shape.
- a predetermined bending rigidity is provided in the vibration direction of the diaphragm 10 and the vibration direction of the voice coil 30.
- the concave curved portion 10A in the diaphragm 10
- the density in the curved portion 10A becomes larger than the density in a part of the other diaphragm 10, and the rigidity can be relatively increased.
- the bending portion 10 ⁇ / b> A is formed between the pair of joint portions 52 ⁇ / b> B formed between the vibration direction conversion unit 50 and the diaphragm 10. ing.
- the vibration plate 10 Since the vibration plate 10 has rigidity (including bending rigidity) in the vibration direction of the vibration plate 10, the occurrence of deflection of the vibration plate 10 is suppressed, a phase difference is generated between sound waves, and divided vibration is generated. It is possible to suppress degradation of acoustic characteristics due to occurrence. Further, the bending portion 10 ⁇ / b> A is formed on the diaphragm 10 between the pair of joint portions 52 ⁇ / b> B formed between the diaphragm 10 and the vibration direction converter vibration direction converter 50. Can be deterred.
- the diaphragm 10 is formed in a substantially rectangular shape having a short axis along the vibration direction of the voice coil 30 and a long axis along a direction orthogonal to the vibration direction of the voice coil 30. You may form a reinforcement part along the direction of an axis
- the reinforcing portion is, for example, a groove portion having a V-shaped cross section or other shape, and is formed in a linear shape, an annular shape, or a lattice shape with respect to the front surface or the back surface of the vibration plate 10.
- a filler such as a dumping agent (damping agent, braking material) may be applied (applied).
- the rigidity (including bending rigidity) of the diaphragm 10 can be improved, and the peak dip of the speaker sound pressure frequency characteristic can be reduced.
- a fiber member (not shown) made of a nonwoven fabric or the like may be attached.
- the rigidity (bending rigidity) of the diaphragm 10 can be improved.
- the diaphragm 10 vibrates, vibration and air resistance propagated from the vibration direction changing section. Therefore, it is possible to suppress deformation such as deflection in the diaphragm 10.
- the internal loss of the diaphragm 10 can be improved by providing the reinforcing portion 10B.
- the diaphragm 10 is formed of a first layer made of a foamed resin made of an acrylic resin or the like and a second layer made of a fiber-based member such as glass fiber, and the first layer is It has a laminated structure sandwiched between a pair of second layers.
- a material for forming the diaphragm 10 for example, a resin material, a metal material, a paper material, a fiber material, a ceramic material, a composite material, or the like can be used.
- An edge 11 that supports the diaphragm 10 to be able to vibrate on a frame 12 that is a stationary portion 100 is disposed between the diaphragm 10 and the frame 12 that is the stationary portion 100, and an inner peripheral portion thereof is an outer peripheral portion of the diaphragm 10.
- the diaphragm 10 is held at a specified position by the outer peripheral portion being joined to the frame 12 directly or via another member.
- the other member include an elastic member (including a resin member) having a function as a packing, an adhesive resin, and the like.
- the edge 11 supports the diaphragm 10 so as to freely vibrate along the vibration direction (Z-axis direction) and brakes in a direction orthogonal to the vibration direction (Y-axis direction).
- the edge 11 is formed in a ring shape (annular shape) as viewed from the acoustic radiation direction, and the cross-sectional shape thereof is a prescribed shape, for example, a concave shape, a convex shape, or a corrugated shape in the acoustic radiation direction.
- a material for forming the edge 11 for example, a known material such as leather, cloth, rubber, resin, a material obtained by applying a sealing process thereto, or a member formed by molding rubber or resin into a specified shape may be used. it can.
- a projection or a concave shape that protrudes toward the front surface (surface on the acoustic radiation side) or the back surface (surface on the opposite side to the acoustic radiation side) is formed on a part or the entire circumference of the edge 11, and the edge
- the rigidity in the 11 prescribed directions may be improved.
- the stationary portion 100 includes an outer peripheral frame portion 101 that surrounds the diaphragm 10 and a bridging portion 102 that bridges the inside of the outer peripheral frame portion 101.
- the bridging portion 102 is connected to the link mechanism 50L (vibration direction converting portion 50) described above. A reaction force is applied and rigidity is provided in the vibration direction of the link mechanism 50L.
- the link mechanism 50L that converts the angle of the link portion 51 is counteracted by the vibration from the diaphragm 10. Receive power.
- the link mechanism 50L receives such a reaction force, the link mechanism 50L itself vibrates when the stationary part 100 supporting the link mechanism 50L bends, and the link mechanism 50L transmits unnecessary vibration to the link portion 51. Will do. If unnecessary vibration transmitted to the link portion 51 is transmitted to the diaphragm 10, the vibration of the voice coil 30 cannot be efficiently transmitted to the diaphragm 10.
- the stationary part 100 includes a first constituent member (first frame) 100A and a second constituent member (second frame) 100B.
- the first component member 100A is a support member on the acoustic emission side of the speaker device 1B
- the second component member 100B is a support member on the opposite side (back side) to the acoustic emission side.
- the drive unit 14 of the speaker device 1 is supported so as to be sandwiched between the first component member 100A and the second component member 100B.
- the first component member 100 ⁇ / b> A includes an outer peripheral frame portion 101 formed in an annular shape, supports the outer periphery of the diaphragm 10 via the edge 11, and one side of the magnetic pole member (yoke portion) 22 of the magnetic circuit 20. (22B) is supported.
- the second component member 100B includes an outer peripheral frame portion 101 and a bridging portion 102, supports one side (22A) of the magnetic pole member (yoke portion) 22 of the magnetic circuit 20, and the bridging portion 102 is a link mechanism 50L. Support. At this time, the bridging portion 102 has rigidity against the force received from the diaphragm 10 via the link mechanism 50L.
- the compliance of the bridging portion 102 is substantially the same as or smaller than the compliance of the outer peripheral frame portion 101. More specifically, it is preferable that the thickness of the bridging portion 102 is substantially the same as or larger than the thickness of a part of the stationary portion 100 that supports the diaphragm 10 or the magnetic circuit 20.
- FIG. 19 and 20 are perspective views showing a single-piece structure of the first component member 100A and the second component member 100B
- FIG. 19A is a plan perspective view of the first component member 100A
- FIG. FIG. 20B is a rear perspective view of the member
- FIG. 20A is a plan perspective view of the second component member 100B
- FIG. 20B is a rear perspective view of the member.
- the first component member 100A is a second outer peripheral frame portion 101B that supports the diaphragm 10 inside the first outer peripheral frame portion 101A, with the outer peripheral frame portion 101 in the stationary portion 100 as the first outer peripheral frame portion 101A. Is provided.
- the opening inside the second outer peripheral portion 101 ⁇ / b> B is blocked by the edge 11 and the diaphragm 10.
- the bridging portion 102 provided in the second component member 100B is formed with a first projecting portion 102A that projects in the extending direction and the vibration direction of the diaphragm 10.
- the first protruding portion 102A has a rib structure formed along the longitudinal direction of the bridging portion 102, thereby increasing the bending rigidity of the bridging portion 102.
- a second projecting portion 102 ⁇ / b> B extending in a direction intersecting with the first projecting portion 102 ⁇ / b> A is formed in the plane of the bridging portion 102 facing the diaphragm 10.
- This 2nd protrusion part 102B becomes a reinforcement rib in the both ends of the bridge part 102, and the bridge part 102 is rigidly supported by the outer periphery frame part 101 at the both ends.
- the bridging portion 102 has a third protrusion 102C extending in a direction intersecting the first protrusion 102A and the second protrusion 102B in the plane of the stationary portion 100 facing the diaphragm 10.
- the reinforcing part 103 having a polygonal planar shape is formed by the plurality of second protrusions 102B and the third protrusions 102C.
- the first component member 100A and the second component member 100B that become the stationary portion 100 have a planar shape having a major axis O 1 and a minor axis O 2 , and the bridging portion 102 is along the minor axis O 2 direction. Is formed. Further, the bridging portion 102 can be formed along the major axis O 1 direction, or can be formed along the major axis ⁇ 1 direction and the minor axis ⁇ 2 direction.
- Convex portions 100m are formed at the four corners of the first constituent member 100A, and concave portions 100n are formed at the four corners of the second constituent member 100B, and the convex portions 100m and the concave portions 100n are fitted together to form the first configuration.
- the member 100A and the second component member 100B are coupled.
- the convex portion 100m may be formed on one of the first constituent member 100A and the second constituent member 100B, and the concave portion 100n may be formed on the other of the first constituent member 100A and the second constituent member 100B.
- the recess 100n may be formed as a hole.
- the second outer peripheral frame portion 101B on which the diaphragm 10 is supported via the edge 11 is formed with a protruding portion 101B1 that protrudes toward the acoustic radiation direction.
- the protrusion 101B1 obtains rigidity for supporting the periphery of the diaphragm 10.
- the first structural member 100A and the second structural member 100B support the yoke portion 22 included in the magnetic circuit 20.
- the first component member 100 ⁇ / b> A and the second component member 100 ⁇ / b> B include a concave receiving portion 105 that accommodates a part of the yoke portion 22.
- the above-described protrusion 22p is fitted into the receiving portion 105, and the yoke portion 22 is positioned in order to form an appropriate magnetic gap.
- a guide portion 106 that guides the wiring 82 for inputting a voice signal to the voice coil 360 from the outside is formed. Further, an opening 101S is formed between the outer peripheral frame portion 101 and the bridging portion 102 in the second component member 100B. A fourth protrusion 102D is formed on the outer peripheral frame portion 101 along the outer peripheral edge of the opening 101S. The fourth protrusion 102D increases the torsional rigidity of the outer peripheral frame 101.
- an excessive vibration suppression portion 108 for suppressing excessive vibration of the voice coil 30 is formed in the first structural member 100A or the second structural member 100B.
- the excessive vibration suppression unit 108 protrudes into the movable region of the voice coil 30, and the excessive vibration of the voice coil 30 is suppressed when the voice coil support unit 40 hits the excessive vibration suppression unit 108.
- a cutout portion 41f is formed in the base of the voice coil support portion 40, and a protruding portion of the excessive vibration suppression portion 108 is disposed in the cutout portion 41f.
- FIG. 21 is a plan view showing a state in which the drive unit is assembled on the first component member 100A.
- the second component member 100B is omitted.
- a pair of magnetic circuits 20 On the first structural member 100A to which the diaphragm 10 and the edge 11 are attached, a pair of magnetic circuits 20, a pair of voice coils 30 (voice coil support portions 40), and a vibration direction conversion portion 50 (link mechanism 50L) are provided. Assembled.
- the magnetic circuit 20 is attached to the first component member 100A in a state where the one-side magnetic pole member 22 indicated by a broken line is joined to the magnet.
- the magnetic pole member 22 includes a plurality of protruding portions 22p, and the protruding portions 22p are supported by the receiving portion 105 having the concave section described above.
- the yoke portion 22, which is a plate-like magnetic body, has a width that decreases from the vibration direction changing portion 50 to the stationary portion 100, thereby preventing the holding portion 15 from contacting the yoke portion 22. .
- the voice coil 30 is elastically held on the stationary part 100 by the holding part 15.
- the holding unit 15 restricts the vibration of the voice coil 30 in one axial direction and suppresses movement in the other direction.
- the voice coil 30 is supported by the voice coil support portion 40 and is held by the attachment unit 16 by the holding portion 15.
- the mounting and positioning of the voice coil 30 are simplified by mounting the mounting unit 16 on the first component member 100A.
- the vibration direction converter 50 includes a first link portion 51A and a second link portion 51B as a link mechanism 50L, one end of the second link portion 51B is supported by the first link portion 51A, and the other end is Supported by the bridge 102.
- the bridging portion 102 that supports the second link portion 51B is formed in a flat plate shape, and the connecting portion 104 that connects the other end of the second link portion 51B and the bridging portion 102 forms a single plane. ing.
- the other end of the second link portion 51B is engaged with the bridging portion 102, so that the vibration direction changing portion 50 and the bridging portion 102 are connected.
- a protruding portion 104A is formed on the connecting portion 104 of the bridging portion 102, and the protruding portion 104A is inserted into a connecting portion 53C formed integrally with the end portion of the second link portion 51B via the joint portion 52.
- a hole 104B is formed.
- the protruding portion 104A of the connecting portion 104 in the bridging portion 102 is a positioning portion 102E that determines the position of the vibration direction changing portion 50 with respect to the stationary portion 100.
- the protrusion 104A is inserted into the hole 104B of the connecting portion 53C that is integrally formed with the end portion of the second link portion 51B via the joint portion 52, so that the vibration direction changing portion 50 is moved with respect to the stationary portion 100. Positioning.
- FIG. 22 and 23 are explanatory views showing an embodiment of the present invention.
- FIG. 22 is a partial cross-sectional view of the above-described speaker device 1B.
- FIG. 23 is a perspective view mainly illustrating a state in which the first component member 100A, the diaphragm 10, and the edge 4J of the speaker device 1B are removed. Portions common to the above description are denoted by the same reference numerals, and a part of the description is omitted.
- the second coupling portion 53B of the vibration direction converter 50 is coupled to the back surface of the diaphragm 10 supported by the first component member 100A.
- the stationary connecting portion 53C of the vibration direction changing portion 50 is connected to the connecting portion 104 formed at the central portion of the bridging portion 102 in the second component member 100B.
- the second connecting portion 53B is a portion integrated with the end portion of the first link portion 51A via the joint portion 52B.
- the end of one link portion 51 ⁇ / b> A and the diaphragm 10 are connected.
- a concave portion is formed on the surface of the diaphragm 10 facing the second connecting portion 53B on the acoustic radiation side, and the diaphragm 10 has rigidity.
- the immovable connecting portion 53C is a portion integrated with the end of the second link portion 51B via a joint portion 52D, and a hole 104B is formed in the connecting portion 53C.
- the protrusion 104A of the connecting portion 104 is inserted, and the connecting portion 104 and the end of the second link portion 51B are connected.
- the voice coil support unit 40 and the vibration direction conversion unit 50 on which the voice coil 30 is supported are connected via a connection unit 60.
- the connecting portion 60 is attached so as to extend along the width of the voice coil support portion 40.
- the connection portion 60 is formed with a connection step portion 60s to which the first connection portion 53A of the vibration direction conversion portion 50 is detachably connected, and a through-hole penetrating along the vibration direction of the voice coil support portion 40. 60p is formed.
- the through hole 60p is a vent hole formed to reduce the air resistance acting on the connecting part 60 against the vibration of the voice coil support part 40.
- the connecting portion 60 connects the first connecting portion 53A of the vibration direction converting portion 50 and the end portion of the voice coil support portion 40 with a space therebetween, and thereby within the height of the vibration direction converting portion 50.
- the height of the magnetic circuit 20 is adjusted.
- the voice coil support part 40 and the connecting part 60 are held by the stationary part 100 by the holding part 15.
- the holding unit 15 includes a first holding unit 15A and a second holding unit made of a curved plate member that allows deformation in one direction along the vibration direction of the voice coil support unit 40 and restricts deformation in the other direction. Part 15B.
- the first holding unit 15A and the second holding unit 15B hold the voice coil support unit 40 on the first component member 100A and the second component member 100B via the mounting unit 16.
- the first holding portion 15A is made of a conductive metal, and is electrically connected to the lead wire drawn from the end of the voice coil 30, and the voice signal is transmitted through the first holding portion 15A. 30.
- the first holding portion 15A is electrically connected to the linear connection terminal portions 81 and 81 supported by the second component member 100B, and is electrically connected to the connection terminal portions 81 and 81, respectively. It is electrically connected to the outside through wirings 82, 82.
- the center portion of the second holding portion 15B is connected to the other side portion of the mounting unit 16, and both ends thereof are connected to the left and right ends of the voice coil support portion 40.
- the second holding portion 15 ⁇ / b> B is arranged within the width of the voice coil support portion 40 so that the holding mechanism of the voice coil support portion 40 is not bulky in the width direction of the whistle coil support portion 40.
- the second holding portion 15B is formed of a continuous member, it has a continuous shape even in the central portion, but it may be formed of a plurality of members and is not particularly limited. Note that a part of the second holding portion 15B is disposed so as to protrude outward from the stationary portion 100. However, the second retaining portion 15B is not limited thereto, and may be changed so as to be accommodated in the stationary portion 100.
- the voice coils 30 and 30 In order to input voice signals to the voice coils 30 and 30 corresponding to the plurality of driving units 14, the voice coils 30 and 30 extend from one voice coil 30 toward the other voice coil 30, A pair of common terminal portions 81, 81 for the voice coils 30, 30 are provided on the stationary portion 100. Further, the terminal portions 81 and 81 are formed between the first frame 12B (first constituent member 100A) and the second frame 12C (second constituent member 100B) constituting the frame 12 which is the stationary portion 100. Terminal portions 81 and 81 are arranged inside an opening portion (not shown). For this reason, compared with the case where the terminal portions are provided at one end and the other end of each voice coil 30, the arrangement of the terminal portions can be saved, and the speaker device can be reduced in size or thickness.
- terminal parts 81 and 81 can be stably fixed to the stationary part 100, and poor connection with the voice coils 30 and 30 can be avoided.
- the terminal portions 81 and 81 are formed in a shape having a long axis extending from one voice coil 30 to the other voice coil 30 and a short axis intersecting the long axis. Thus, by making it elongate shape, the efficiency of installation space can be improved.
- the terminal portions 81 and 81 are formed with connection portions 81a for wirings 82 and 82 that are electrically connected to the outside, and the terminal portions 81 and 81 and wirings 82 are electrically connected by the connection portion 81a.
- the wiring 82 is fixed to the side surface of the stationary portion 100, and the outer peripheral frame portion 101 of the stationary portion 100 has a side surface to which the wiring 82 is attached, and the side surface of the stationary portion 100 guides the wiring 82.
- Portions 106 and 106 are formed.
- a conductive layer (voice coil lead wire) 32 connected to a lead wire 31 made of a conductive member is formed on the voice coil support portion 40 (base) that supports the voice coil 30.
- the conductive layer (voice coil lead wire) 32 is patterned on the voice coil support portion 40 (base) so as to surround the conductive member of the voice coil 30, and the conductive layer (voice coil lead wire) 32 is voice coil lead.
- the conductive member of the voice coil 30 and the holding unit 15 are electrically connected via the line 31.
- the holding portion 15 is formed with a wiring that electrically connects the voice coil 30 and the terminal portion 81, and the conductive layer (voice coil lead wire) 32 and the wiring of the holding portion 15 are electrically connected, The holding portion 15 and the end portions of the terminal portions 81, 81 are electrically connected, and the wiring 82 is connected to the terminal portions 81, 81, whereby an audio signal is input to the voice coil 30 from the outside.
- connection part F1 connected to the terminal parts 81 and 81 is formed in the holding part 15.
- the connecting portion F1 extends in a direction intersecting with the vibration direction (Z-axis direction) of the diaphragm 10 and is formed in a flat plate shape so as to contact the terminal portions 81 and 81.
- the holding portion 15 is also formed with a connection portion (not shown) that is connected to the voice coil lead wire 43 and extends in a direction intersecting with the vibration direction (Z-axis direction) of the diaphragm 10, It is formed in a flat plate shape so as to come into contact with the end of the line 43.
- the attachment unit 16 includes a first connection portion 16a to which the end portion of the first holding portion 15A is connected on both the left and right sides of the connecting portion 60, and a second connection portion to which the second holding portion 15B is connected.
- 16b is provided behind the voice coil support portion 40, and has an integrated support portion 16c that integrally supports the first connection portion 16a and the second connection portion 16b.
- connection hole portions 16d into which the convex portions 100m provided in the first component member 100A of the stationary portion 100 are inserted are provided at the four corners of the mounting unit 16, and are fixed to the stationary portion 100 at predetermined positions.
- the yoke portions 22A and 22B are attached to the first component member 100A and the second component member 100B. Further, by coupling the first component member 100A and the second component member 100B, a gap formed between the yoke portions 22A and 22B or between the magnets 21 becomes a magnetic gap.
- the height of the magnetic circuit 20 is almost the entire height of the entire apparatus, and the voice coil support portion 40 vibrates in the vicinity of the center of the magnetic circuit 20.
- the end portion of the voice coil support portion 40 and the end portion of the vibration direction converting portion 50 are connected at different heights via the connecting portion 60, each link portion of the vibration direction changing portion 50 is connected to the device. A sufficient length can be secured within the height. Further, a part of the height of the magnetic circuit 20 can be accommodated within the height of the vibration direction converter 50.
- FIG. 24 shows a modification of the speaker device according to the embodiment of the present invention. Portions common to the above description are given the same reference numerals and redundant description is omitted.
- a yoke part 22 formed of a plate-like magnetic body is laminated.
- the yoke parts 22A and 22A1 made of two laminated magnetic bodies are supported on the first component member 100A side that supports the diaphragm 10, and the two laminated magnetic members are arranged on the second component member 100B side.
- the yoke portions 22B and 22B1 made of a body are supported.
- the magnetic gap of the magnetic circuit 20 is formed between the magnets 21 and 21 and the yoke portions 22A and 22B adjacent to each other.
- the yoke portions 22A, 22A1, 22B, and 22B1 have protrusions 22p (corresponding to the first protrusions 22p1 and 22p2) that protrude in a direction intersecting the vibration direction of the voice coil 30. Is formed.
- the protruding portion 22p is formed with a step portion on the side surface of the stationary portion 100 facing the yoke portion 22, and the protruding portion 22p is supported on the step portion to form a magnetic gap.
- FIG. 25 shows another modification of the speaker device according to the embodiment of the present invention.
- the magnet 21 is disposed on the side of the magnetic gap and the magnetic gap is formed within the thickness of the magnet 21, so that the magnetic circuit 20 can be made thinner and the thickness of the magnet 21 can be secured. Yes.
- the arrow indicates the direction of the magnetic pole of the magnet 21.
- the magnetic circuit is formed separately for each corresponding linear portion of the voice coil 30.
- the magnets 21 and 21 are sandwiched between both sides of the pair of yoke portions 22Aa and the yoke portion 22Ba that sandwich the magnetic gap, and in parallel with the magnets on both sides of the pair of yoke portions 22Ab and the yoke portion 22Bb that sandwich the magnetic gap. 21 and 21 are clamped.
- the magnetic gap is formed between the convex portions 22a and 22b protruding from the yoke portion.
- two magnetic circuits are arranged in the X-axis direction, but they can be integrally formed.
- FIG. 26 is an explanatory diagram for explaining the connection between the holding unit 15 and the attachment unit 16.
- the second holding portion 15B which is an integral part, and the attachment unit 16 are connected via an adhesive resin.
- the flat plate portions F, F at the left and right ends of the second holding portion 15B are connected to the connecting portions 40g, 40g at the left and right ends of the edge 40f1 via connecting parts 40g1, 40g1 having holes 40g2, respectively.
- the flat plate portion F at the center of 15B is coupled to the coupling end portion 16f1 of the attachment unit 16. Note that the edge 40f1 of the voice coil support 40 on the side opposite to the vibration direction changer side of the voice coil support 40 is formed in a concave shape on the voice coil 30 side.
- the voice coil support portion 40 is formed in a planar shape that can prevent the coil support portion 40 from vibrating and coming into contact with the mounting unit 16. Specifically, a relatively large gap is formed between the connecting end portion 16f1 of the mounting unit 16 and the end edge 40f1 of the voice coil support portion 40, and the flat portion F side on the left and right ends of the second holding portion 15B. As it moves to, it becomes the planar shape which protrudes toward the 2nd holding
- the flat portions F at the left and right ends of the second holding portion 15B are formed with holes into which the connecting portions 40g at the left and right ends of the other side edge 40f1 of the voice coil support portion 40 are inserted.
- FIG. 27 is an enlarged view showing the electrical connection structure of the holding portion.
- FIG. 4A shows in detail that one connection surface F2 of the first holding portion 15A is connected to the connection terminal portion 42 of the voice coil lead wire 32 (conductive layer).
- FIG. 2B shows in detail the other connecting surface F1 of the first holding portion 15A connected to the terminal portion 81.
- the first holding portion 15 ⁇ / b> A has a connection surface F ⁇ b> 1 on one end side connected to the terminal portion 81, and a connection surface F ⁇ b> 2 on the other end side connected to the connection terminal 42 of the voice coil lead wire 32.
- the terminal portion 81 electrically connects one end side of the pair of first holding portions 15A to the wiring 82 (external), and an audio signal input from the wiring 82 passes through the terminal portion 81 and the first holding portion 15A.
- the terminal portion 81 is a rod-shaped conductive member, and a positioning hole is formed. By positioning a positioning projection 111 provided on the stationary portion 100 into the positioning hole, the terminal portion 81 is positioned at a specific location in the stationary portion 100.
- the terminal portion 81 is configured by a member (insulating member) having insulation properties such as a resin member, and a conductive member is provided on the insulating member, and is electrically connected to the connection surface F 1 of the holding portion 15. It doesn't matter.
- FIG. 28 is an explanatory diagram showing an electronic apparatus including the speaker device according to the embodiment of the present invention.
- the electronic device 2 such as the mobile phone or the portable information terminal shown in FIG. 5A, or the electronic device 3 such as the flat panel display shown in FIG.
- the thickness space necessary for installing the speaker device 1 can be reduced.
- the overall thickness can be reduced.
- sufficient audio output can be obtained even in a thin electronic device.
- FIG. 29 is an explanatory view showing an automobile provided with a speaker according to an embodiment of the present invention.
- the space in the vehicle can be expanded by making the speaker device 1 thinner.
- the speaker device 1 according to the embodiment of the present invention is attached to a door panel or ceiling as a member to be attached, the protrusion of the door panel can be made relatively small, and the driver's operation space and the indoor space can be increased. Is possible. Also, since sufficient audio output can be obtained, music and radio broadcasting can be enjoyed comfortably in the car even during high-speed driving with a lot of noise.
- a hotel inn or training that can accommodate a large number of people, such as a house (building) intended for the residence of people, a meeting, a lecture, a party, etc.
- a large number of people such as a house (building) intended for the residence of people, a meeting, a lecture, a party, etc.
- buildings In facilities and the like (buildings), when the speaker device 1 is installed on a wall or ceiling as a member to be attached, the thickness space necessary for the installation of the speaker device 1 can be reduced, so that unnecessary space in the room can be deleted. Can be used effectively.
- projectors and large-screen TVs, etc. there have been examples of providing living rooms with audio / video equipment, while living rooms without audio / video equipment have been provided. In some cases, etc. are used as theater rooms.
- the speaker device 1 Even in such a case, by using the speaker device 1, it is possible to easily convert a living room or the like into a theater room and to effectively use the space in the living room.
- positioning location of the speaker apparatus 1, the ceiling, wall, etc. (attachment member) in a living room are mentioned, for example.
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Abstract
Description
図2は本発明の実施形態に係るスピーカ装置の基本構成を示した説明図である(同図(a)がX軸方向に沿った断面図、同図(b)が駆動部の動作を示した説明図)。スピーカ装置1は、振動板10と、振動板10を振動方向に沿って振動自在に支持する静止部100と、静止部100に設けられ、音声信号によって振動板10に振動を与える駆動部14とを備え、駆動部14は、磁気ギャップ20Gを形成する磁気回路20と、音声信号が入力され、振動板10の振動方向とは異なる方向に振動するボイスコイル30と、ボイスコイル30の振動を方向変換して振動板10に伝える振動方向変換部50とを備えている。図示においては、ボイスコイル30はボイスコイル支持部40に支持されているが、ボイスコイル30自体が振動方向変換部50と連結されるものであってもよい。ここでは、ボイスコイル30の振動方向をX軸方向とし、それと直交する2方向をそれぞれY軸方向とZ軸方向としている。
また、ボイスコイル支持部40としての平板状の絶縁部材には、導線の外側に複数の導電層が形成されている。この導電層(ボイスコイル引出線)32(図21参照)は、導線の始点及び終点から引き出される引出線31(図21参照)と電気的に接続される。この引出線31(図21参照)は、例えば、後述する導電部材の一部で構成される。また、後述する保持部15(図21参照)を介して外部と電気的に接続されており、外部からの音声信号をボイスコイル30に入力する中継線として機能している。また、例えば、ボイスコイルに対して遊離する導線を中継線としてスピーカ装置内で引き回す場合には、配線を引き回すスペースを別途必要とする。しかし、中継線としての導電層(ボイスコイル引出線)32(図21参照)をボイスコイル支持部40の表面に形成することで、中継線のためのスペースを確保する必要がなくなり、スピーカ装置を薄型化することができる。
図示の例では、ボイスコイル30及びボイスコイル支持部40は平板状に形成されているが、これに限定されず、筒形状に形成しても構わない。また、ボイスコイル30又はボイスコイル30を支持するボイスコイル支持部40が筒形状である場合には、振動方向変換部50側の端部に、振動方向変換部が角度変更自在に連結することを可能にする、平板状の蓋部を取り付けても構わない。
図3及び図4は、振動方向変換部50の構成例と動作を説明する説明図である。ボイスコイル30の振動を方向変換して振動板10に伝える剛性の振動方向変換部50は、振動板10側とボイスコイル30側のそれぞれに関節部分52を形成してボイスコイル30の振動方向に対して斜設されたリンク部分51を有する。ここで、関節部分52とは、2つの剛性を有する部材を回転自在に接合する部分、又は一体化された剛性を有する2つの部分を屈折又は屈曲自在にする部分であり、リンク部分51とは、関節部分52が端部に形成された剛性を有する部分である。ここで、剛性とはボイスコイル30の振動を振動板10に伝達できる程度に変形しないことを指し、全く変形しないことのみを指しているわけではない。リンク部分51は、板状又は棒状に形成することができる。
なお、前述の一体形成に関する技術は、2005年5月12日に米国出願されたUS20050127233(公開番号:US2005/253298)、2005年5月13日に米国出願されたUS20050128232(公開番号:US2005/253299)に記載されており、本願は前記の公報に記載される内容を援用する。
図15及び図16は、本発明の実施形態に係るスピーカ装置用磁気回路を示した説明図である。磁気回路20は、前述したように磁石21と磁極部材(ヨーク部)22を備えており、この磁石21と磁極部材22によってボイスコイル30の振動方向に配置される複数の磁気ギャップ20G1,20G2を備えている(図示の30Xはボイスコイル30の中心線)。
なお、図15に示される第1の磁極面20X、20X1は磁石21で構成されているが、例えば磁石21と平板部22h1との間に挟まれた、或いは磁石21の磁気ギャップ20G1側に設けられた磁性体と磁石21とで構成される第1の磁極面20Xを用いても構わない。
図17は、本発明の実施例に係るスピーカ装置の平面図、図18はその背面図を示している。以下の説明では、図8に示したスピーカ装置1Bを基本構成としたもので、磁気回路20として図16に示したものを装備したスピーカ装置を説明する。
図25は、本発明の実施例に係るスピーカ装置の他の変形例を示したものである。前述の説明と共通する部分は同じ符号を付して重複説明を省略する。この変形例では、先ず磁石21を磁気ギャップの側部に配置して磁石21の厚さ内に磁気ギャップを形成することで、磁気回路20の薄型化と磁石21の厚さ確保を両立させている。矢印は磁石21の磁極の方向を示している。また、図示の例では、ボイスコイル30の対応する直線部分毎に分けて磁気回路を形成している。すなわち、磁気ギャップを挟む一対のヨーク部22Aaとヨーク部22Baの両側部で磁石21,21が挟持され、それと平行して、磁気ギャップを挟む一対のヨーク部22Abとヨーク部22Bbの両側部で磁石21,21が挟持されている。磁気ギャップは、ヨーク部から突出する凸部22a,22b間に形成される。図示の例では、2つの磁気回路をX軸方向に並べているが、これを一体に形成することもできる。
なお、ボイスコイル支持部40の振動方向変換部側に対して逆側における、ボイスコイル支持部40の端縁40f1は、ボイスコイル30側に凹状に形成されており、ボイスコイル30の振動によってボイスコイル支持部40が振動し、取り付けユニット16と接触することを抑止できる平面形状に、ボイスコイル支持部40は形成されている。具体的には、取り付けユニット16の連結端部16f1とボイスコイル支持部40の端縁40f1との間に比較的大きい間隙を形成するとともに、第2の保持部15Bの左右両端の平坦部F側に移るに連れて、第2の保持部15Bに向かって突出する平面形状になっている。なお、第2の保持部15Bの左右両端の平坦部Fには、ボイスコイル支持部40の他方側縁40f1の左右両端の接続部40gが挿入される孔部が形成されている。
Claims (33)
- 平面状のボイスコイルの振動を、剛性の振動方向変換部を介して振動板に伝えるスピーカ装置に用いられ、前記ボイスコイルを平面的に振動させるスピーカ装置用磁気回路であって、
前記ボイスコイルの振動方向に配置される複数の磁気ギャップを備え、
該複数の磁気ギャップに臨む前記ボイスコイルで仕切られる片側の磁極面は、磁石を含む磁性体で構成される第1の磁極面と、前記磁石と磁気的に接合した板状の磁性体で構成される第2の磁極面とを備え、
前記板状の磁性体は、前記第1の磁極面を形成する前記磁性体との接合面と前記第2の磁極面とを段差状に形成して、前記第1の磁極面と前記第2の磁極面とを略同じ高さにしていることを特徴とするスピーカ装置用磁気回路。 - 前記板状の磁性体は、前記磁石と磁気的に接合される平板部と、前記平板部から前記第2の磁極面に至る傾斜部とを備えることを特徴とする請求項1に記載のスピーカ装置用磁気回路。
- 前記平板部に、前記第1の磁極面を構成する磁性体が配置されることを特徴とする請求項2に記載のスピーカ装置用磁気回路。
- 前記ボイスコイルで仕切られるスペースの他方に、第3の磁極面及び第4の磁極面が形成されていることを特徴とする請求項3に記載のスピーカ装置用磁気回路。
- 前記第1の磁極面には前記第3の磁極面が対向配置され、
前記第2の磁極面には前記第4の磁極面が対向配置されており、
前記磁石を含む磁性体にて前記第3の磁極面は構成されるとともに、前記板状の磁性体にて前記第4の磁極面が構成されることを特徴とする請求項4に記載のスピーカ装置用磁気回路。 - 前記第1の磁極面と前記第3の磁極面にて形成される磁気ギャップ内における磁束密度は、前記第2の磁極面と前記第4の磁極面にて形成される磁気ギャップにおける磁束密度に対して、大きいことを特徴とする請求項5に記載のスピーカ装置用磁気回路。
- 請求項1に記載のスピーカ装置用磁気回路を駆動部として備え、 振動板と、該振動板を振動方向に沿って振動自在に支持する静止部とを備え、音声信号によって前記振動板に振動を与える前記駆動部は、前記静止部に支
持されると共に、磁気ギャップを形成する磁気回路と、前記音声信号が入力さ
れ、前記振動板の振動方向とは異なる方向に沿って振動するボイスコイルと、
前記ボイスコイルの振動を方向変換して前記振動板に伝える前記振動方向変換
部とを備えることを特徴とするスピーカ装置。 - 前記静止部は、前記スピーカ装置用磁気回路を囲む外周枠部と底面部とを備え、
前記スピーカ装置用磁気回路が有する、前記板状の磁性体は、
前記静止部の外周枠部に向かって延びる突出部を備え、
前記突出部を介して、前記スピーカ装置用磁気回路は前記静止部に支持されることを特徴とする請求項7に記載のスピーカ装置。 - 前記ボイスコイルの振動方向に対して交差する方向に沿って、複数の前記突出部が互いに逆の向きに延びていることを特徴とする請求項8に記載のスピーカ装置。
- 複数の前記突出部は、前記ボイスコイルの振動方向に対して交差する方向に沿って延びる第1の突出部を複数備えるとともに、
前記ボイスコイルの振動方向に沿って延びる第2の突出部を備えることを特徴とする請求項8に記載のスピーカ装置。 - 前記静止部には、前記突起部を支持する受け部が形成されていることを特徴とする請求項8に記載のスピーカ装置。
- 前記突出部の端部は、前記静止部の受け部に支持されていることを特徴とする請求項11に記載のスピーカ装置。
- 前記受け部は、断面が凹状に形成されていることを特徴とする請求項12に記載のスピーカ装置。
- 前記静止部は、複数の構成部材で形成されており、
前記第2の磁極面及び前記第4の磁極面を構成する前記板状の磁性体の各々を、前記複数の構成部材が支持していることを特徴とする請求項13に記載のスピーカ装置。 - 前記板状の磁性体は、前記振動方向変換部から当該振動方向変換部と対向する前記静止部にかけて、その幅が小さくなることを特徴とする請求項14に記載のスピーカ装置。
- 前記第2の磁極面及び前記第4の磁極面は、複数の前記板状の磁性体にて構成されることを特徴とする請求項15に記載のスピーカ装置。
- 複数の前記スピーカ装置用磁気回路は、前記振動体を挟んで、前記ボイスコイルが振動する方向に沿って並べて配置されることを特徴とする請求項15に記載のスピーカ装置。
- 前記振動方向変換部は、一端部が前記ボイスコイルに角度変更自在に直接又は他の部材を介して連結されるとともに、他端部が前記振動板に角度変更自在に直接又は他の部材を介して連結され、
前記振動板の振動方向および前記ボイスコイルの振動方向それぞれに対して斜設された剛性のリンク部分を備えることを特徴とする請求項7に記載のスピーカ装置。 - 前記振動方向変換部は、前記ボイスコイル支持部と前記振動板との間に形成されたリンク部分を角度変換させるリンク機構を備えることを特徴とする請求項7に記載のスピーカ装置。
- 前記振動方向変換部における前記ボイスコイル側の端部と前記ボイスコイルの前記振動方向変換部側の端部との間に両端部の位置を前記振動方向に沿って異ならせて連結する連結部を備えることを特徴とする請求項7に記載のスピーカ装置。
- 前記振動方向変換部は、前記振動板および前記ボイスコイルを含む被取付部材と連結しているとともに、該被取付部材に近接する関節部分を備え、
前記関節部分に近接する前記被取付部材の面側には、前記関節部分と接触することを避ける接触回避部が形成されていることを特徴とする請求項7に記載のスピーカ装置。 - 前記振動方向変換部は、前記振動板および前記ボイスコイルを含む被取付部材と連結しているとともに、該被取付部材に近接する関節部分を備え、
前記関節部分と対向する前記被取付部材の面側には、前記振動方向変換部と前記被取付部材とを接合する接着部材の収容部が形成されていることを特徴とする請求項7に記載のスピーカ装置。 - 前記振動方向変換部は、前記ボイスコイルと前記振動板との間で角度変更自在に斜設される剛性のリンク部分と、該リンク部分の両端に形成される関節部分とを備え、
前記関節部分は、当該関節部分を跨いだ両側の部分で連続する屈折自在な連続部材で形成されていることを特徴とする請求項7に記載のスピーカ装置。 - 前記ボイスコイルは、平面状で且つ環状に巻かれた導電部材と、前記導電部材を支持する剛性の基体とを備え、
前記基体における前記導電部材の外側の表面には、導電層がパターン形成されていることを特徴とする請求項7に記載のスピーカ装置。 - 前記導電層は、前記導電部材を取り囲むように一対配備され、前記導電部材に音声信号を入力するための中継線として機能することを特徴とする請求項24に記載のスピーカ装置。
- 前記ボイスコイルを、前記静止部に直接又は他の部材を介して、前記ボイスコイルの振動方向に振動自在に保持する第1の保持部を備えることを特徴とする請求項1に記載のスピーカ装置。
- 前記ボイスコイルを、前記静止部に直接又は他の部材を介して、当該ボイスコイルの振動方向に振動自在に保持する第2の保持部を備えることを特徴とする請求項26に記載のスピーカ装置。
- 前記振動方向変換部における前記ボイスコイル側の端部と前記ボイスコイルの前記振動方向変換部側の端部との間に両端部の位置を前記振動方向に沿って異ならせて連結する連結部を備え、
前記連結部と前記静止部との間において、前記第1の保持部は該連結部の左右に配置され、
前記第2の保持部は、前記第1の保持部に対して前記静止部側で、前記ボイスコイルに対して左右に配置され、
前記第1の保持部及び前記第2の保持部は前記ボイスコイルを略左右対称に前記静止部に直接又は他の部材を介して保持することを特徴とする請求項27に記載のスピーカ装置。 - 前記第2の保持部は、中央部が直接又は他の部材を介して前記静止部に保持され、その両端が前記ボイスコイルの左右端に接続されていることを特徴とする請求項28記載のスピーカ装置。
- 前記第1の保持部及び前記第2の保持部は、取り付けユニットを介して前記連結部及び前記ボイスコイルを前記静止部に保持することを特徴とする請求項28に記載のスピーカ装置。
- 請求項7に記載のスピーカ装置を備えることを特徴とする電子機器。
- 請求項7に記載のスピーカ装置を備えることを特徴とする自動車。
- 請求項7に記載のスピーカ装置を備えることを特徴とする建築物。
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JPS63250995A (ja) * | 1987-04-07 | 1988-10-18 | Citizen Watch Co Ltd | 薄型スピ−カ |
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JPS63250995A (ja) * | 1987-04-07 | 1988-10-18 | Citizen Watch Co Ltd | 薄型スピ−カ |
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