JP2001128289A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker that can easily be manufactured with high sound quality. SOLUTION: The speaker is provided with a frame 1, a diaphragm 4 of a plate shape provided contactlessly to an inside of the frame 1, and a drive mechanism that is fixed to a mount 18 fitted to the frame 1 to provide vibration to the diaphragm 4. A clearance 50 is formed between a projection member 33 provided in the drive mechanism 20 and a joint member 46 provided in the diaphragm 4 and having a larger diameter than that of the projection member 33, an adhesive 51 is filled in the clearance 50 and solidified to connect and fix the diaphragm 4 and the drive mechanism 20. Thus, the loudspeaker A that can be easily manufactured with high sound quality, can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker provided with a diaphragm.

[0002]

2. Description of the Related Art Conventionally, as a speaker, for example, a speaker unit for a bass range,
It is known that a speaker unit for a mid-range sound, a speaker unit for a high sound range, and the like are mounted to accommodate these speaker units in an enclosure.

[0003]

In such a conventional loudspeaker, the loudspeaker unit is mounted on the baffle plate on the front, so that the vibrating portion and the driving portion of the diaphragm of the loudspeaker unit are connected via the frame of the loudspeaker unit. The vibration of the enclosure is transmitted to the enclosure. Also, the vibration of the cone of the speaker unit compresses the air behind the speaker unit,
The wall pressure of the enclosure is pressed and vibrated by the air pressure, and this vibration interferes with the vibration of the cone of the speaker unit. For this reason, the acoustic characteristics of the enclosure affect the sound production, which causes the reproduction sound quality to deteriorate.

[0004] For this reason, for example, a loudspeaker has been developed in which a flat diaphragm is mounted on a mounting frame and the diaphragm is driven to drive sound as described in Japanese Patent Publication No. 4-64240. In such a speaker, a driving mechanism for driving the diaphragm, that is, one of a voice coil and a center pole (magnet) is provided on the diaphragm side and the other is provided on the mounting frame side in advance, and positioning of the two is performed. And are manufactured by assembling them. As described above, since a driving mechanism that is difficult to position or the like is configured in the final stage of the manufacturing, the manufacturing requires a highly skilled technique. Therefore, further improvement has been desired so that it can be mass-produced industrially.

[0005] In view of the above circumstances, it is an object of the present invention to provide a speaker that can obtain high sound quality and can be easily manufactured.

[0006]

According to the first aspect of the present invention,
A speaker, comprising: a frame; a plate-shaped diaphragm provided in a non-contact manner inside the frame; and a driving mechanism fixed to a mounting portion provided on the frame to apply vibration to the diaphragm. A clearance is formed between a first joint provided on the drive mechanism side and a second joint provided on the diaphragm side, and the clearance is filled with an adhesive. Thereby, the diaphragm and the drive mechanism are connected and fixed.

[0007] With such a configuration, the manufacture of the speaker can be facilitated. That is, after assembling the frame, the drive mechanism, and the diaphragm integrally, in a separate process, an adhesive is injected into a clearance formed between the second joint and the first joint to be solidified. Then the speaker is completed.
As described above, since the second joint and the first joint have a dimensional margin, the frame, the driving mechanism, and the diaphragm can be easily assembled, and the speaker can be easily manufactured.
Further, since the members constituting the speaker have a dimensional margin, the dimensional accuracy required for such members can be relaxed, and the manufacture thereof can be facilitated.

According to a second aspect of the present invention, there is provided the speaker according to the first aspect, wherein the diaphragm is provided with a rib for reinforcing the diaphragm.

With this configuration, the strength of the diaphragm can be improved. Further, the reproduction sound quality can be improved. That is, since the diaphragm is provided with a number of ribs located on one surface of the diaphragm, the sound waves vibrate in order to hold and send out the air having the sound waves on one surface of the diaphragm with the ribs. The sound is prevented from wrapping around the other surface of the plate and the resonance is suppressed, so that the reproduced sound quality is improved.

According to a third aspect of the present invention, in the loudspeaker according to the first or second aspect, the driving mechanism comprises: a fixed portion having a magnet; A movable portion having a movable coil, wherein the first joining portion is formed by a projecting member joined to the coil having a projection projecting toward the diaphragm, and the second joining portion is formed by the projecting member; The portion is formed by a cylindrical joint member provided in a hole formed in the diaphragm.

With this configuration, the manufacture of the speaker can be further facilitated. That is, after assembling the frame, the drive mechanism, and the diaphragm integrally, in a separate process, an adhesive is injected from the hole into the clearance formed between the joint member and the projection member, and the speaker is completed. Therefore, the injection of the adhesive can be facilitated, and the manufacture of the speaker can be facilitated. In addition, since the joint member and the projection member have a dimensional allowance, the dimensional accuracy required for such a member can be relaxed, and the manufacture thereof can be facilitated.

According to a fourth aspect of the present invention, in the speaker according to any one of the first to third aspects, the adhesive is a reaction-curable resin mortar.

With this configuration, the workability of bonding the second joint and the first joint is improved, and the time required for manufacturing the speaker is reduced.

According to a fifth aspect of the present invention, in the loudspeaker according to any one of the first to fourth aspects, the diaphragm is provided inside the frame via an elastic member. I do.

[0015] With this configuration, the vibration of the diaphragm can be prevented from being transmitted to the frame, and the diaphragm can be supported and guided.

The invention according to claim 6 is the speaker according to any one of claims 1 to 5, wherein the frame is provided with an attachment to which a stand or a locking member is attached. I do.

With such a configuration, the speakers can be installed in various places in various forms. In other words, if a stand is attached to the attachment, the speaker can be used as a stand-alone type by making the speaker self-supporting. It can also be used as a bracket type.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a speaker according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1 to FIG.
Is composed of a frame 1, a drive mechanism 20 (fixed part 2, movable part 3), and a diaphragm 4. The frame 1 forms the outer frame of the speaker A and holds the driving mechanism 20 and the diaphragm 4, and has a substantially square front shape. This frame 1 is different from the main functions of an enclosure or a box-shaped baffle (cabinet) used for a conventional speaker, and includes a portion provided for holding and fastening the diaphragm 4 as necessary, It has a part that is compatible with each type of use, such as self-standing, standing, and fitting. In this embodiment, the schematic shape of the front is substantially square, but may be other shapes such as a circle and an ellipse, and can be freely selected mainly from a design point of view of the speaker.

The frame 1 includes a first frame 11 and a second frame 12. The main part of the frame 1, that is, the first frame 11 and the second frame 12, are formed of a wooden material. In addition to the wood material, a metal molded product, a resin molded product, or a mechanical structure made of these may be used.

The first frame 11 constitutes a substantially square outer frame, and the second frame 12 together with the first frame 11 constitutes a substantially square outer frame. Outer frame 12a
And a beam portion 12b having an attachment portion 18 of the drive mechanism 20. An open hole 13 is formed in the second frame 12, and a sound wave emitted from the diaphragm 4 is transmitted to the second frame 1.
It is radiated to two sides. The first frame 11 and the second frame 12 are connected and fixed by a connecting screw 14. Note that the first frame 11 and the second frame 12 may be joined and fixed with an adhesive without using the coupling screw 14. An elastic member 60 which is a rubber tubular body is sandwiched between the first frame 11 and the second frame 12. The frame 1 supports and guides the diaphragm 4 via the elastic member 60. That is, the frame 1 and the diaphragm 4 are not in direct contact. The shape and the mounting method of the elastic member 60 are not limited as long as the elastic member 60 can elastically support and guide the diaphragm 4 as well as the tubular body.

The attachment 16 is fixed to one side of the frame 1 with a screw or the like so that the speaker A can be installed at various places in various forms, and has an attachment hole 17 formed therein. For example, when the speaker A is used as a wall-mount type or a bracket type, the speaker A can be fixed to a wall-type or bracket-type by locking the mounting hole 17 to a locking member (not shown) such as a screw provided in advance on the wall side or the bracket side. Can be used as When the speaker A is used as a stationary type, the speaker A can be made independent by attaching a stay (stand) 15 to the attachment hole 17. In addition to this example, a method of providing a mounting flange at a corresponding portion for mounting from the front side, or a snap-action type fitting type utilizing the elasticity of the frame material may be used.

The mounting portions 18 are for connecting the magnetic circuit, that is, the fixing portion 2, and are provided at two places on the beam portion 12b. A yoke 22 of the fixing portion 2 described later is connected and fixed to the mounting portion 18 by press-fitting or by using an adhesive. The yoke 22 may be fixed to the beam portion 12b or the mounting portion 18 by a screw or the like, with a slight dimensional allowance provided between the mounting portion 18 and the yoke 22.

As shown in FIG. 4, the drive mechanism 20 is composed of a fixed part 2 and a movable part 3,
Vibrates the diaphragm 4 with respect to the speaker A.
Two sets are provided as a whole. The fixed part 2 constitutes a moving coil type magnetic circuit by the pole (magnet) 21, the yoke 22, and the magnetic conducting piece 23. Here, the inner magnet type is shown, but in addition to this example, the outer magnet type may be used.

The pole 21 is a columnar permanent magnet, and the yoke 22 is a ring-shaped mild steel member. The magnetic piece 23 is a doughnut-shaped plate made of mild steel. The yoke 22 is attached to an attachment portion 18 provided on the second frame 12. The pole 21 is fixed to a portion near the center of the yoke 22 and for receiving the coil bobbin 32 of the movable portion 3. Further, the magnetic conductive piece 23 is fitted to the yoke 22 so as to surround the pole 21 by press fitting or caulking. Note that the yoke 22 and the magnetic conductive piece 23 may be integrated.

The movable part 3 is a moving coil (coil)
31, coil bobbin 32, projection member (first joint) 3
3 and a damper 34. The moving coil 31 is a voice coil having a cylindrical winding, and the coil bobbin 32 is a thin cylindrical winding core around which the moving coil 31 is wound. The moving coil 31 and the coil bobbin 32 constitute a drive coil for the magnetic circuit of the fixed unit 2. Further, a projection member 33 having a projection 33b is provided at the tip of the coil bobbin 32. In such a drive mechanism 20, the power supplied to the fixed unit 2, which is a magnetic circuit, is controlled by a control circuit (not shown), and the moving coil 33 is driven to move forward and backward with respect to the fixed unit 2. The damper 34
One side is fixed to the yoke 22 and the other side is fixed to the coil bobbin 32.
The movable part 3 is movably connected to the fixed part 2 by the damper 34.

In this embodiment, two sets of a magnetic circuit and a drive coil, that is, two sets of drive mechanisms are provided. The number of the sets is appropriately determined according to the control of the vibration state of the diaphragm 4, the acoustic output, and the dynamic range. This is selected, and one or two or more sets are used per unit of the diaphragm 4.

The diaphragm 4 includes a diaphragm main body 41, peripheral ribs (ribs) 42, horizontal ribs (ribs) 43, and vertical ribs (ribs) 4.
4 is provided. The diaphragm main body 41 has both upper and lower portions curved so as to form part of a substantially cylindrical (elliptical cylinder) surface, and has a plate-like shape in which the central portion is substantially planar and the whole is curved in one direction. ing. In addition, a normal flat plate, a plate obtained by bending the periphery of a flat plate to have a curved shape, and the like can be used.
The front shape of the outer shell is a square, a circle, an ellipse, or the like according to the shape of the frame 1. The diaphragm main body 41 is made of a balsa wood veneer. In addition, other than balsa material, any material having light weight and appropriate rigidity may be used.
The main ones are listed in (a) to (e) below. (A) Pulp paper and mixed papers of various woody materials and inorganic / organic fibers, metal fibers and the like. (B) Wood veneers (cypress, other softwoods) or laminates of such veneers. (C) A resin plate or a low foam resin plate. (D) An integrally molded product made of resin or low foaming resin. (E) A composite plate formed by joining any one of paper, a metal plate, a resin material, a foamed resin material, and the like.

Peripheral rib 42, horizontal rib 43, vertical rib 44
Is provided on the surface of the diaphragm main body 41 on the second frame 12 side so as to protrude toward the second frame 12 side. The peripheral ribs 42 are adhesively bonded so as to surround the periphery of the diaphragm main body 41, and the horizontal ribs 43 and the vertical ribs 44
It is bonded to the diaphragm main body 41 inside the peripheral rib 42 in the horizontal and vertical directions so as to form a lattice. By doing so, the rigidity and strength of the diaphragm 4 increase, and split vibration can be suppressed. The peripheral ribs 42, the horizontal ribs 43, and the vertical ribs 44 are lightweight and have appropriate rigidity. Materials and processing methods are appropriately determined in view of the acoustic characteristics of the speaker, the shape and size of the diaphragm, the manufacturing cost, and the like. Is the choice.

The periphery of the diaphragm main body 41, that is, the peripheral rib 41 forms an operation surface connected to the elastic member 60, and the diaphragm 4 is supported and guided by the frame 1 via the elastic member 60. .

The vibration plate 4 and the driving mechanism 2
0 is connected and fixed as follows. That is, a plate 32a is formed at the distal end of the coil bobbin 32 of the movable portion 3 constituting the drive mechanism 20 so as to cover the cylindrical coil bobbin 32. The plate 32a has an outer peripheral edge protruding toward the diaphragm 4 side. The outer peripheral rib 32b is integrally formed. The projection member 33 is provided in a form held by the plate 32a and the outer peripheral rib 32b. The protruding member 33 is formed from a base portion 33a abutting on the plate 32a inside the outer peripheral rib 32, and a cylindrical protrusion 33b protruding from the center of the base portion 33a to the diaphragm 4 side. The tip 33 of
c is closed.

On the other hand, the driving mechanism 20
A hole 45 is formed at a position corresponding to, and a cylindrical joint member (second joint) 46 is fitted into the hole 45. This joint member 46
Is fixed to the hole 45 by flanges 46a and 46b on the outer peripheral side thereof, so that it does not directly contact the projection member 33.
The third projection 33b is set to be larger than the outer diameter of the projection 33b by a predetermined dimension. Thereby, the joint member 46 and the projection member 33
A clearance 50 is formed between the protrusions 33b. By filling the clearance 50 with the adhesive 51, the joint member 46 and the projection member 3 are filled.
3 are joined, that is, the diaphragm 4 and the drive mechanism 20 are connected and fixed.

As the adhesive 51, for example, a reaction-curable resin mortar is suitable, and a type such as a light-reactive type or a heat-reactive type is appropriately selected depending on the conditions of the manufacturing process and the like.
Note that other types may be used.

The diaphragm 4 is subjected to a surface treatment such as painting (not shown) in order to improve its surface hardening and environmental resistance and to improve the design. In order to cover the hole 45 and protect such a joint, a cap 48 is provided.
Are fitted.

In order to manufacture the speaker A having the above structure, the frame 1, the drive mechanism 20 and the diaphragm 4 are assembled together, and then the projection member 33 and the joint member 4 are formed in a separate step.
The speaker is completed by injecting and filling and solidifying the adhesive 51 into the clearance 50 formed between the speaker 50 and the speaker 50. At this time, since the clearance 50 is formed between the projection member 33 and the joint member 46, the joining of the diaphragm 4 to the drive mechanism 20 can be easily performed.

The loudspeaker A operates as follows. First, an output signal of the amplifier is input to the drive mechanism 20. Then, the moving coil 31 vibrates, and this vibration is transmitted to the diaphragm 4 via the protrusion member 33, the adhesive 51, and the joint member 46. Thereby, the diaphragm 4 vibrates, and a sound wave is emitted.

A peripheral rib 42, a horizontal rib 43, and a vertical rib 44 are provided on the second frame 12 side of the diaphragm 4, and the upper and lower edges of the diaphragm 4 are curved toward the second frame 12. Therefore, the air having the sound wave on the second frame 12 side of the diaphragm 4 is held by the peripheral rib 42, the horizontal rib 43, and the vertical rib 44,
The diaphragm 4 is pushed out to the second frame 12 side. That is, the sound wave is scattered up, down, left and right of the diaphragm 4,
Is prevented from wrapping around the other side. Therefore, the sound wave radiated from the diaphragm 4 to the first frame 11 and the sound wave radiated to the second frame 12 hardly interfere with each other, and are very clear on any side. High sound quality can be obtained.

The diaphragm 4 is supported and guided by the frame 1 via an elastic member 60. That is, since the frame 1 and the diaphragm 4 are not in contact with each other, the response to an input signal is very good, and the vibration of the diaphragm 4 is hardly transmitted to the frame 1. For this reason, unlike the conventional case, the acoustic characteristics of the enclosure do not greatly affect the sound generation, and pure sound can be heard directly, so that very clear high sound quality can be obtained.

In the speaker A according to the present embodiment,
A clearance 50 is formed between the projection member 33 and the joint member 46, and the clearance 50 is filled with an adhesive 51 so that the diaphragm 4 and the drive mechanism 20 are connected and fixed. ing. Therefore, after assembling the frame 1, the drive mechanism 20, and the vibration plate 4 integrally, in a separate process, the adhesive 51 is injected into the clearance 50 formed between the projection member 33 and the joint member 46 and solidified. Then, the speaker will be completed,
The speaker can be easily manufactured. As described above, since the projection member 33 and the joint member 46 have a dimensional allowance, the frame 1, the drive mechanism 20, and the diaphragm 4 can be easily assembled integrally, and the speaker A can be easily manufactured.
Further, since the projection member 33 and the joint member 46 have dimensional allowance, the dimensional accuracy required for the members constituting the speaker A can be relaxed, and the manufacture thereof can be facilitated. As described above, the manufacturing cost can be reduced and the manufacturing time can be reduced without requiring a high level of skill in manufacturing the speaker A. Further, the diaphragm 4 has ribs for reinforcing the diaphragm 4, that is, peripheral ribs 42, lateral ribs 4 and the like.
3. Since the vertical ribs 44 are provided, the strength of the diaphragm 4 can be improved, and sound waves can be prevented from wrapping around the first frame 11 of the diaphragm 4 to suppress resonance. Therefore, the reproduction sound quality can be improved.

Further, since the adhesive 51 is a reaction-curable resin mortar that is cured by light or heat, the time required for joining the projection member 33 and the joint member 46 is reduced, and the manufacturing time of the speaker A is further reduced. Will be shortened. Further, since the diaphragm 4 is supported inside the frame 1 via the elastic member 60, it is possible to prevent the vibration of the diaphragm 4 from being transmitted to the frame 1. Furthermore, since the frame 1 is provided with an attachment to which the stay 15 or the locking member is attached, the speakers A can be installed in various forms in various places.

In the above embodiment, the diaphragm and the ribs are made of wood such as balsa material. However, as described above, other materials such as resin may be used. FIG. 5 shows an example in which the diaphragm is an integrally molded resin product. The diaphragm 100 includes a diaphragm main body 101, a peripheral rib 102, a horizontal rib 103, and a vertical rib 1.
04, the oblique rib 105, the joint member 106, and the joint rib 107 are integrally formed. The oblique rib 105 is provided so as to mainly form a diagonal line between the horizontal rib 103 and the vertical rib 104, and the joint rib 107 includes the joint member 106 and the peripheral rib 10.
2. It is provided between each of the horizontal rib 103 and the vertical rib 104. Compared to the diaphragm 4 using wood or the like, the diaphragm 100 can be mass-produced by integral molding and thus can be manufactured more easily. Further, since a rib having a complicated shape can be easily formed, the strength is further increased. Can be done. The diaphragm 100 is appropriately selected in terms of the acoustic characteristics of the speaker, the shape and size of the diaphragm, the manufacturing cost, the design point of view, and the like.

Further, although the first joint is a cylindrical projection member and the second joint is a cylindrical joint member, they may have other shapes. Such an example is shown in FIGS. 6 (a) and 6 (b). As shown in this figure, a plurality of projections 142 protruding toward the coil bobbin 32 are integrally formed as a first joint around the hole 141 of the diaphragm 140. Further, a disc-shaped joining board 130 having a plurality of projections 133 alternately arranged with the projections 142 as a second joining portion is fitted to the distal end portion of the coil bobbin 32. A clearance 150 is formed between the protrusion 142 and the protrusion 133. The clearance 150 is filled with an adhesive (not shown) and solidified to connect and fix the drive mechanism 20 and the diaphragm 140. it can. In this figure, reference numeral 21 is a pole, and reference numeral 1 is
22 is a member in which the yoke and the magnetic conductive piece are integrated. The shapes of the first joint and the second joint are appropriately determined in view of the acoustic characteristics of the speaker, the shape and size of the diaphragm, the joint strength required for the diaphragm and the drive mechanism, or the manufacturing cost. Is the choice.

[0043]

As described above, the loudspeaker according to the present invention has the above-described configuration, so that it is possible to provide a loudspeaker which can be manufactured easily and can obtain high sound quality.

[Brief description of the drawings]

FIG. 1 is a front view of a speaker according to an embodiment of the present invention.

2 is a cross-sectional view of the speaker of FIG. 1 taken along the line II.

FIG. 3 is a rear view of the speaker of FIG. 1;

FIG. 4 is a partially enlarged view showing the drive mechanism in FIG. 2 in an enlarged manner.

FIG. 5 is a perspective view showing a diaphragm used for a speaker which is another example of the embodiment of the present invention.

FIGS. 6A and 6B are diagrams showing a first joint and a second joint used for a speaker as another example of the embodiment of the present invention, wherein FIG. 6A is a side sectional view, and FIG. a) II-
FIG. 2 is a sectional view taken along line II.

[Explanation of symbols]

 Reference Signs List 1 frame 2 fixed part 3 movable part 4, 100, 140 diaphragm 15 stand (stay) 16 attachment 20 drive mechanism 21 pole (magnet) 31 moving coil (coil) 33 projecting member (first joint) 42, 102 Ribs (ribs) 43, 103 Horizontal ribs (ribs) 44, 104 Vertical ribs (ribs) 45, 141 Holes 46, 106 Joint member (second joint) 50 Clearance 51 Adhesive 60 Elastic member 105 Oblique rib 107 Joint Rib 133 Projection (first joint) 142 Projection (second joint)

Claims (6)

[Claims] 1. A frame, a plate-shaped diaphragm provided in a non-contact state inside the frame, and a drive mechanism fixed to a mounting portion provided on the frame to apply vibration to the diaphragm. A clearance is formed between a first joint provided on the drive mechanism side and a second joint provided on the diaphragm side, and the clearance is filled with an adhesive. The speaker is characterized in that the diaphragm and the drive mechanism are connected and fixed. 2. The speaker according to claim 1, wherein the diaphragm is provided with a rib for reinforcing the diaphragm. 3. The driving mechanism includes a fixed portion having a magnet, and a movable portion having a coil movable in a thickness direction of the diaphragm with respect to the fixed portion. A cylindrical member provided with a projection member having a projection protruding toward the diaphragm and joined to the coil, wherein the second joint portion is provided in a hole formed in the diaphragm. The speaker according to claim 1, wherein the speaker is formed by a joint member. 4. The speaker according to claim 1, wherein the adhesive is a reaction-curable resin mortar. 5. The speaker according to claim 1, wherein the diaphragm is provided inside the frame via an elastic member. 6. The speaker according to claim 1, wherein the frame is provided with an attachment to which a stand or a locking member is attached.