JP2009141657A - Speaker apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact, omnidirectional speaker instrument having satisfactory acoustic characteristics. <P>SOLUTION: The speaker apparatus has a vibrating body 2, a casing 1 for supporting the outer-periphery section of the vibrating body 2, a magnetic circuit 3 disposed opposite to the casing 1, and a support section 11. In the speaker apparatus, the vibrating body 2 is disposed between the casing 1 and the magnetic circuit 3. The support section 11 supports the casing 1 and the magnetic circuit 3. A buffer member 17 is mounted at the outside of the casing 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an omnidirectional speaker device that diffuses radiated sound in all directions in the horizontal direction.

  In a conventional speaker device, an outer peripheral edge of cone paper having a cone raised portion that protrudes outward at a substantially central position is attached to an opening of a housing (cabinet) via an edge, and a voice coil bobbin is attached to the cone raised portion. And a voice coil attached. In this speaker device, the outer peripheral edge of a frame having a substantially dome shape and having a through-hole formed in the substantially center is attached to the opening, and a magnetic circuit is provided so that the magnetic gap faces the opening. Is attached so that the voice coil bobbin and the voice coil are loosely inserted into the magnetic gap (see, for example, Patent Document 1). Hereinafter, this technique is referred to as a first conventional example.

  Some conventional speaker devices have a plate attached to the tip of a T-shaped center pole attached to the center of the frame, and a magnet is interposed between the plate and the bottom yoke. . A voice coil bobbin having a voice coil wound around the outer periphery is loosely inserted in the magnetic gap between the bottom yoke and the plate. The plate, bottom yoke, magnet and the like constitute a magnetic circuit. Each of the voice coil bobbins is supported by a damper and a diaphragm fixed to the frame (see, for example, Patent Document 2). Hereinafter, this technique is referred to as a second conventional example.

  Further, in addition to the configuration of the second conventional example described above, the conventional speaker device has a protrusion formed on the side surface of the bottom yoke, and the protrusion is fitted into the center portion of the speaker grille. There is one in which a hole is fitted and the speaker grille is locked. A rubber sheet for absorbing an impact is interposed between the speaker grill and the bottom yoke. The front end of the outer peripheral portion of the speaker grille is in contact with the flange portion of the frame with a predetermined distance from the diaphragm and the bonded portion of the frame (see, for example, Patent Document 2). Hereinafter, this technique is referred to as a third conventional example.

Japanese Utility Model Publication No. 50-146535 (page 5, line 8 to line 12, FIG. 3) Japanese Patent Laid-Open No. 9-18983 ([0002], [0016], [0019], FIGS. 2 and 5)

  When a sound signal (sound current) is supplied to the voice coil, the speaker device is based on the electromagnetic force (Lorentz force) between the magnetic flux from the magnetic circuit and the sound current passed through the voice coil. A driving force in the central axis direction is induced in the voice coil. Since this driving force is transmitted to the vibrating body via the voice coil bobbin, the vibrating body made of cone paper or the like vibrates to generate a sound wave (hereinafter referred to as “acoustic”) corresponding to the voice current (front side). ) Radiates toward the space.

  Since the air pressure generated when the vibrating body vibrates acts on the casing that supports the outer peripheral edge of the vibrating body, the casing vibrates. On the other hand, when the driving force described above is induced in the voice coil, a force in the direction opposite to the driving force induced in the voice coil acts in the magnetic circuit due to the reaction. As a result, a member such as a yoke constituting the magnetic circuit vibrates or resonates. Furthermore, the housing and the magnetic circuit are connected by a support member, a frame, or the like. Therefore, the vibration of the casing is transmitted to the magnetic circuit via the support member, the frame, or the like, and conversely, the vibration of the magnetic circuit is transmitted to the casing via the support member, the frame, or the like.

  As a result, the member or the case constituting the magnetic circuit emits the sound having the opposite phase or the same phase as the sound radiated from the diaphragm such as cone paper constituting the vibrating body. As a result, the sound radiated from the member constituting the magnetic circuit or the case cancels or strengthens the sound radiated from the vibrating body, and the sound pressure of the sound that should be radiated (reproduced sound pressure) There is a problem that the frequency characteristic is disturbed and the acoustic characteristic of the speaker device is deteriorated.

  In the first to third conventional examples described above, no measures are taken to suppress vibrations of the housing itself and the magnetic circuit itself. Further, in the first to third conventional examples described above, the casing and the magnetic circuit are both exposed, and it is not possible to suppress acoustic radiation from the casing and the magnetic circuit. Therefore, there is a problem that the acoustic characteristics of the speaker device are deteriorated by canceling or strengthening the sound emitted from the vibrating body.

  In both the first and third conventional examples, a part of the frame extends around a diaphragm such as cone paper that emits sound. Accordingly, the air pressure generated by the vibration of a vibrating body such as cone paper acts on the frame extending around the diaphragm such as cone paper, so that the frame itself vibrates to emit unnecessary sound, and the speaker. There is a problem that the acoustic characteristics of the device may be adversely affected. In addition, since the frame is an obstacle to the propagation of sound, directivity is generated and sound is radiated in all directions, more specifically, in the horizontal direction (substantially the vibration direction of the voice coil). The sound pressure level in the vertical direction is approximately equal, and the non-directional speaker device functions sufficiently that there is no significant difference between the sound pressure level in the horizontal direction and the sound pressure level in the vibration direction of the voice coil. There is a problem that it cannot be demonstrated. Further, in the first conventional example described above, since it is necessary to arrange the frame so as to surround the outer peripheral portion of the diaphragm, there is a problem that the entire speaker device cannot be reduced in size.

  Further, in each of the first to third conventional examples described above, the long voice method in which the voice coil is longer than the width opposite to the magnetic gap is adopted. Therefore, the length of the voice coil bobbin around which the voice coil is wound becomes longer, and the weight of the entire vibrator including the voice coil and the voice coil bobbin longer than usual increases. There is a problem that transmission is difficult, and in particular, a high-frequency reproduction band is reduced.

  This invention is made | formed in view of the situation mentioned above, and makes it an example of a subject to solve the above problems, and provides the speaker apparatus which can solve these subjects. With the goal.

  In order to solve the above-described problem, a speaker device according to a first aspect of the present invention is arranged to face a vibrating body, a casing that supports an outer peripheral portion of the vibrating body, and the casing. A magnetic circuit; and a support portion, wherein the vibrating body is disposed between the housing and the magnetic circuit, and the housing and the magnetic circuit are supported by the support portion. A shock-absorbing member is attached to the outside of the head.

  According to a third aspect of the present invention, there is provided a speaker device comprising: a vibrating body; a housing that supports an outer peripheral portion of the vibrating body; a magnetic circuit that is disposed so as to face the housing; And the diffuser, wherein the vibrating body is disposed between the casing and the magnetic circuit, and the casing and the magnetic circuit are supported by the support portion so as to cover the magnetic circuit. The above diffuser is provided, and a buffer member is attached to the outside of the diffuser.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 1 of the present invention. The speaker device includes a housing 1, a vibrating body 2, a magnetic circuit 3, and a diffuser (diffuser) 4. The housing 1 has a substantially circular planar shape and a substantially pan-shaped cross section. The housing 1 has a function as a base of the speaker device.

  As a material of the housing 1, for example, glass fiber is added as a reinforcing filler to thermoplastic resins such as olefins such as PP (polypropylene), ABS (acrylonitrile / budadiene / styrene), and PET (polyethylene terephthalate). , A fibrillated thermotropic liquid crystalline polyester resin dispersed in the thermoplastic resin, and an olefin-based thermoplastic resin to which basalt fiber (basalt fiber) is added as a filler.

  Moreover, as a material of the housing | casing 1, metal materials, such as aluminum, magnesium, brass, are mentioned, for example. For details of the material of the casing 1 described above, refer to, for example, Japanese Patent Application Laid-Open Nos. 2006-303969 and 2007-288258.

  The upper end 1a of the housing 1 has a substantially annular shape. An edge support portion 1ab is formed on the upper end 1a of the housing 1 from substantially the vicinity of the outer peripheral edge to the inner peripheral edge of the upper end surface 1aa. On the other hand, a concave portion 1ba having a substantially columnar shape is formed at the substantially lower center of the bottom 1b of the housing 1. A through-hole 1c having a substantially columnar shape is formed in the approximate center of the recess 1ba. The shaft portion 12a of the first support member 12 constituting the support portion 11 for supporting the magnetic circuit 3 is inserted into the through hole 1c. The first support member 12 can be constituted by, for example, a bolt in which a head portion 12b having a substantially hexagonal shape and a shaft portion 12a having a substantially cylindrical shape are integrally formed. The head 12b of the first support member 12 is accommodated in the recess 1ba.

  The shaft portion 12 a of the first support member 12 is inserted into the second support portion 13 having a substantially cylindrical shape that constitutes the support portion 11. On the outer periphery of the shaft portion 12a, male threads (not shown) having a predetermined shape are spirally formed at a predetermined pitch from the tip to the head 12b in a predetermined range. The inner diameter of the second support member 13 is substantially equal to the inner diameter of the through hole 1c. The first support member 12 and the second support member 13 are made of, for example, substantially the same material as that of the casing 1 described above.

  On the outer peripheral surface of the second support member 13, a pair of terminals 14 having a substantially L-shaped cross section are attached at two substantially symmetrical positions. One end of each of the pair of tinsel wires 15 is electrically connected to each terminal 14, and one end of each of the pair of external connection wires 16 is electrically connected to each terminal 14. Each tinsel wire 15 is formed by twisting a plurality of thin electric wires and is strong against bending. The other ends of the pair of tinsel wires 15 are electrically connected to both ends of a voice coil 24 wound around the outer periphery of a voice coil bobbin 23 described later. The voice coil 24 is a short voice type voice coil whose vibration range is within a portion where the magnetic flux density of the magnetic gap is uniform. On the other hand, the pair of external connection lines 16 are respectively inserted into the two through holes 1d drilled in the housing 1 and pulled out to the outside.

  On the other hand, a through hole having a substantially columnar shape and substantially the same inner diameter as the outer diameter of the shaft portion 12 a of the first support member 12 is provided at the approximate center of a main body portion 31 a of a yoke 31 (described later) constituting the magnetic circuit 3. 31aa is perforated. On the inner periphery of the through hole 31aa, a female screw (not shown) having a predetermined shape for screwing with a male screw formed on the outer periphery of the shaft portion 12a of the first support member 12 is formed in a spiral at a predetermined pitch. . Therefore, the central axis of the through hole 1 c of the casing 1, the central axis of the second support member 13, and the central axis of the through hole 31 aa of the yoke 31 almost coincide with the inner bottom surface of the casing 1. After the second support member 13 and the yoke 31 are sequentially placed on the first support member 12, the shaft portion 12 a of the first support member 12 is sequentially inserted into the through hole 1 c and the second support member 13, and the first support member 12. The male screw is screwed into the female screw of the through hole 31aa, so that the housing 1 and the yoke 31 are fastened by the first support member 12. Thus, the support part 11 is supporting so that the magnetic circuit 3 including the housing | casing 1 and the yoke 31 may oppose.

  A plurality of through holes 1d are formed around the through hole 1c formed in the housing 1 so as to surround the through hole 1c. Each through-hole 1d exchanges air from the bottom 1b side of the housing 1 between the internal space of the speaker device formed by the housing 1 and the vibrating body 2 and the external space of the speaker device. It has a function as a ventilation hole which suppresses the temperature rise of the internal space of the apparatus. Furthermore, each through-hole 1d also has an air pressure adjusting function for preventing the air pressure in the internal space of the speaker device from increasing and the vibration of the vibrating body 2 from being appropriately controlled. In addition, in the busless type speaker device in which the housing 1 functions as a cabinet, the through-holes 1d are formed in the housing 1, whereby the low-frequency resonance frequency can be reduced. Of the plurality of through-holes 1d, the two through-holes 1d have a pair of external connection wires 16 inserted at the respective ends thereof electrically connected to the pair of terminals 14 as described above. It is configured to be pulled out.

  A buffer member 17 is fixed to the outside of the housing 1 with an adhesive or the like. The buffer member 17 is for suppressing the vibration of the housing 1 from being emitted as sound to the outside of the speaker device. As a material of the buffer member 17, a non-woven fabric such as nylon is impregnated with a material that is difficult to transmit vibration, for example, a rubber material, a soft fiber material such as felt, an elastomer material, a silicon gel, a polyurethane resin, an epoxy resin, or the like. There are things. Examples of the rubber material include silicon rubber, polyisobutylene rubber, polyisoprene rubber, polychloroprene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, and isobutylene-isoprene rubber, which are natural or synthetic, and foamed. Or non-foamed. The shock-absorbing member 17 does not necessarily have an acoustic function. The shock-absorbing member 17 has a function of preventing the outside of the housing 1 from directly touching air and blocking transmission of vibration generated in the housing 1. Any material or shape may be used as long as it has a structure.

  The buffer member 17 includes a member having a function as a sound absorbing member, a member having a function as a vibration damping member, and a member having a function as an echo suppression member. Here, the sound absorbing member is a member that absorbs sound by converting sound energy into thermal energy by air viscosity resistance, fiber vibration, friction, etc. (porous type), and vibration in the thickness direction by the force of sound pressure. The sound energy is consumed due to internal loss of the material and absorbs sound (plate vibration type), which applies the principle of the Helmholtz resonator, and the air at the narrow inlet of the resonator moves violently at the resonance frequency. There are three types (resonance type) in which sound energy is consumed by frictional resistance.

  As the porous sound absorbing member, for example, a nonwoven fabric composed of fibers of carbon, glass, polyester, polyether, polyamide, or the like, or a base material provided with a resin on the nonwoven fabric, a polyurethane resin, a rubber material, or the like Examples include foamed members, polyurethane foam, and the like. Examples of the plate vibration type sound absorbing member include a flat plate member made of wood, resin, rubber material, or the like.

  On the other hand, the vibration damping member suppresses the fixed sound that is radiated as a sound wave again by vibrating the floor vibration and the side wall vibration caused by the force of sound waves to propagate inside the material and vibrate the wall of the adjacent chamber. Refers to a member. Specific examples of the damping member include a plywood (plywood), an artificial leather composed of a resin and a nonwoven fabric (see, for example, JP-A-2006-271847), a flat metal member having a large weight, and the like. From the viewpoint of the mass rule (the larger the mass, the greater the sound insulation effect), a member made of a metal material is preferred. However, it is necessary that the pores and the like are not formed in the interior and are formed continuously.

  The echo suppression member is a member used as one type of the vibration damping member. The echo suppression member has irregularities formed on the surface, and even if the echo suppression member vibrates and the sound is radiated into the space when the housing 1 vibrates, a plurality of sounds with different phases are suppressed. It has the property that it interferes with each other in the vicinity of the member (cancellation) and does not propagate sound farther than the echo suppression member. Furthermore, as an echo suppression member, even when sound propagated through space from the outside acts on the echo suppression member, a plurality of reflected waves reflected by the echo suppression member interfere with each other (cancellation). In addition, it is necessary that the reflected wave does not propagate farther than the echo suppression member.

  The vibrating body 2 includes a diaphragm 21, an edge 22, a voice coil bobbin 23, a voice coil 24, and a damper 25. The planar shape of the diaphragm 21 has a substantially annular shape. The diaphragm 21 has a substantially conical shape (cone shape) and is arranged so as to cover the housing 1.

  Examples of the material of the diaphragm 21 include paper, a woven fabric using fibers, a knitted fabric using fibers, a nonwoven fabric, a woven fabric using fibers impregnated with a binding resin made of a silicone resin, a metal material, There are synthetic resins, acrylic foams, hybrid materials made of synthetic resins and metals, and the like. Examples of the metal material include aluminum, titanium, duralumin, beryllium, magnesium, and alloys thereof. Examples of the synthetic resin include polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polyethylene naphthalate, polyarylate, polymethyl methacrylate, polycarbonate, epoxy resin, and the like. The acrylic foam is made from, for example, methyl methacrylate, methacrylic acid, styrene, maleic anhydride, and methacrylamide.

  In the first embodiment, an edge 22 is formed integrally with the diaphragm 21 on the outer peripheral edge of the diaphragm 21. The edge 22 has appropriate compliance and rigidity. The edge 22 has a substantially roll shape in which the planar shape has a substantially annular shape and the longitudinal cross-sectional shape protrudes to the back side (the opposite side to the acoustic radiation direction) of the speaker device. The outer peripheral edge (outer peripheral portion) of the edge 22 is fixed to the edge support portion 1ab formed on the upper end 1a of the casing 1 with an adhesive or the like. As described above, the diaphragm 21 is connected to the housing 1 via the edge 22. That is, the edge 22 elastically supports the diaphragm 21 with respect to the housing 1. As described above, since the edge 22 is formed integrally with the diaphragm 21, the material of the edge 22 is the same as the material of the diaphragm 21 described above. In the first embodiment, the diaphragm 21 and the edge 22 are integrally formed. However, the present invention is not limited to this, and the diaphragm 21 and the edge 22 are formed as separate members. May be.

  The outer peripheral surface near the lower end of the voice coil bobbin 23 is fixed to the inner peripheral edge of the diaphragm 21 with an adhesive or the like. As a material of the voice coil bobbin 23, for example, a metal material or a resin can be adopted. Specifically, for example, a metal such as aluminum or duralumin, a resin film such as polyimide, or the like can be used as the material of the voice coil bobbin 23.

  The voice coil bobbin 23 has a substantially cylindrical shape. The voice coil bobbin 23 according to the first embodiment extends from an inner periphery of a diaphragm 21 described later to the magnetic circuit 3 and is disposed between the diaphragm 21 and the magnetic circuit 3. By disposing the voice coil bobbin 23 between the diaphragm 21 and the magnetic circuit 3, the length of the voice coil bobbin 23 can be made relatively small, and the weight of the vibrating body 2 can be reduced. In addition, by making the length of the voice coil bobbin 23 relatively small, vibration of the voice coil 24 described later can be relatively easily transmitted to the diaphragm 21, and in particular, a high frequency reproduction band can be expanded. Further, by arranging the voice coil bobbin 23 between the terminal 14 described later and the magnetic circuit 3, even if the voice coil bobbin 23 vibrates due to vibration of the voice coil 24 described later, the voice coil bobbin 23 contacts the terminal 14 described later. It is possible to suppress the generation of abnormal noise by contacting a terminal 14 described later.

  On the other hand, a voice coil 24 is wound around the outer peripheral surface near the upper end (that is, the magnetic circuit 3 side) of the voice coil bobbin 23. Both ends of the voice coil 24 are electrically connected to the other ends of the pair of tinsel wires 15 as described above. Further, the inner peripheral edge of the damper 25 is fixed to the approximate center of the outer peripheral surface of the voice coil bobbin 23 with an adhesive or the like.

  The damper 25 has a substantially annular shape in plan view. The damper 25 has appropriate compliance and rigidity. Corrugation is formed in the damper 25 concentrically with the inner peripheral edge of the diaphragm 21. That is, the cross-sectional shape of the damper 25 has a plurality of convex portions and concave portions. The damper 25 is formed, for example, by impregnating a cloth with a phenolic resin or the like, a solution made of a phenolic resin and an organic solvent, and the like, and by heat molding.

  The outer peripheral edge of the damper 25 is fixed to the lower surface of a substantially annular damper support member 41 attached with an adhesive or the like near the lower end of the inner wall of the recess 4a of the diffuser 4 with an adhesive or the like. As described above, the diaphragm 21 is connected to the diffuser 4 via the damper 25 and the damper support member 41. That is, the damper 25 elastically supports the diaphragm 21 with respect to the diffuser 4.

  Accordingly, the damper 25 is arranged such that the diaphragm 21, the voice coil bobbin 23, and the voice coil 24 are arranged at predetermined positions of the speaker device together with the edge 22 in a stationary state of the speaker device (a state where the speaker device is not driven). Support elastically. In particular, the damper 25 and the edge 22 are arranged such that the voice coil 24 is disposed in a magnetic gap formed between the outer peripheral wall of the main body 31a constituting the yoke 31 and the inner peripheral wall of the plate 32. 21, the voice coil bobbin 23 and the voice coil 24 are elastically supported. In this case, the damper 25 elastically holds the voice coil bobbin 23 and the voice coil 24 at predetermined positions that do not contact the yoke 31, the plate 32, the magnet 33, and the like. Further, the damper 25 also has a role of elastically supporting the diaphragm 21, the voice coil bobbin 23, and the voice coil 24 along the vibration direction (Y direction shown in FIG. 1) in the driving state of the speaker device.

  A magnetic circuit 3 is provided at the upper part of the support part 11, that is, at the end opposite to the housing 1. The magnetic circuit 3 is an outer magnet type in which a magnet 33 is sandwiched between a yoke 31 and a plate 32. The yoke 31 is made of a magnetic material such as pure iron, oxygen-free steel, or silicon steel. The yoke 31 is formed by integrally forming a main body portion 31a having a substantially cylindrical shape and a flange portion (outer ring portion) 31b having a substantially annular shape extending from the upper end of the main body portion 31a in the outer peripheral direction. As described above, a through-hole 31aa having a substantially cylindrical shape and having an inner diameter substantially the same as the outer diameter of the shaft portion 12a of the first support member 12 is formed in the approximate center of the main body portion 31a. On the inner periphery of the through hole 31aa, a female screw (not shown) having a predetermined shape for screwing with a male screw formed on the outer periphery of the shaft portion 12a of the first support member 12 is formed in a spiral at a predetermined pitch. . The flange portion 31 b is formed so that the outer diameter is substantially equal to or larger than the outer diameter of the plate 32. In the example of FIG. 1, the outer diameter of the flange portion 31 b is substantially equal to the outer diameter of the plate 32.

  The plate 32 is made of a magnetic material such as iron, for example. The plate 32 has a substantially annular shape. The magnet 33 is made of, for example, a permanent magnet such as a rare earth, samarium / cobalt, alnico, or ferrite magnet. The magnet 33 has a substantially annular shape. The magnet 33 has an outer diameter larger than the outer diameter of the yoke 31 and the plate 32, and an inner diameter larger than the outer diameter of the main body portion 31 a constituting the yoke 31. The magnet 33 is formed so that the thickness of the magnet 33 is substantially equal to or greater than the thickness of the plate 32. In the example of FIG. 1, the thickness of the magnet 33 is about twice the thickness of the plate 32. The yoke 31, the plate 32, and the magnet 33 are fixed by, for example, an adhesive or the like so that the central axes in the thickness direction of each other overlap each other.

  The magnetic circuit 3 described above is accommodated in a recess 4 a formed in the diffuser 4. That is, the magnetic circuit 3 is surrounded by the diffuser 4. The diffuser 4 has a substantially circular planar shape. Examples of the material of the diffuser 4 include metal materials, synthetic resins, and hybrid materials made of synthetic resins and metals. Examples of the metal material include zinc, aluminum, titanium, duralumin, beryllium, magnesium, and alloys thereof. Synthetic resins include, for example, hard materials such as ABS (acrylonitrile / budadiene / styrene), polybutylene terephthalate, and polyphenylene sulfide. Examples of the synthetic resin used for the hybrid material include polypropylene as well as the above-described synthetic resin. On the other hand, examples of the metal used for the hybrid material include aluminum and tungsten. The material of the damper support member 41 described above may be the same as the material of the diffuser 4 described above.

  In the speaker device having the above configuration, when an audio signal (audio current) is supplied, the audio current is supplied to the voice coil 24 through the pair of external connection lines 16, the pair of terminals 14, and the pair of tinsel wires 15. . Thereby, the central axis direction of the speaker device (Y direction shown in FIG. 1) based on the electromagnetic force (Lorentz force) between the magnetic flux based on the magnet 33 constituting the magnetic circuit 3 and the audio current supplied to the voice coil 24. ) Is induced in the voice coil 24. This driving force is transmitted to the diaphragm 21 via the voice coil bobbin 23. The vibration plate 21 receives the action of the driving force and is elastically supported by the edge 22 and the damper 25, vibrates in the Y direction shown in FIG. 1, and has sound corresponding to the sound current in the front surface (sound radiation direction). Radiates towards the space.

  The air pressure generated when the diaphragm 21 vibrates acts on the housing 1 that supports the outer peripheral edge of the diaphragm 21. However, since the shock-absorbing member 17 is attached to the outside of the housing 1, vibrations in the housing 1 can be suppressed and the housing 1 is not in direct contact with the air that is a sound wave medium. Even if vibration is generated in the housing 1, the vibration can be prevented from being radiated to the outside as sound. Therefore, it is possible to suppress the occurrence of a phenomenon in which the sound radiated from the diaphragm 21 is canceled by the sound radiated from the housing 1. As a result, it is possible to suppress a decrease in the reproduced sound pressure of the sound that should be radiated, to suppress disturbance in the frequency characteristics, to suppress a decrease in the acoustic characteristics of the speaker device, and to obtain good acoustic characteristics. In addition, when the sound from the outside acts on the buffer member 17, particularly when the buffer member 17 is a sound absorbing member, the above-described sound is converted into thermal energy, and a reflected wave is generated from the buffer member 17. Can be deterred.

  Here, FIG. 2 shows an example of the acoustic characteristics of the speaker device. In FIG. 2, a curve a is a characteristic curve when the buffer member 17 is not provided in the speaker device shown in FIG. 1, and a curve b is a characteristic curve when the buffer member 17 is provided in the speaker device shown in FIG. . From FIG. 2, the peak dip is large when the buffer member 17 is not provided, but when the buffer member 17 is provided, the peak dip is reduced and the sound quality is improved by increasing the sound pressure. I understand.

  In the speaker device according to Embodiment 1 of the present invention, a part of the frame is provided on the acoustic radiation side of the diaphragm 21 constituting the vibrating body 2 as in the first and third conventional examples described above. An open space is formed without extending. Therefore, the vibration of the frame can be suppressed, and the frame itself can be prevented from emitting sound. As a result, it is possible to suppress a decrease in acoustic characteristics of the speaker device. Further, since the frame does not become an obstacle to the propagation of sound, the sound is radiated in all directions without causing directivity. More specifically, the horizontal direction (substantially the vibration direction of the voice coil). The sound pressure level in the vertical direction is approximately equal, and the non-directional speaker device functions sufficiently that there is no significant difference between the sound pressure level in the horizontal direction and the sound pressure level in the vibration direction of the voice coil. Can be demonstrated. Furthermore, since it is not necessary to arrange a frame so as to surround the outer periphery of the diaphragm 21, the entire speaker device can be reduced in size.

  Furthermore, since the speaker device according to Embodiment 1 of the present invention employs the short voice method, the weight of the entire vibrator 2 can be reduced, and the voice coil bobbin 23 is a part of the magnetic circuit 3. It is possible to suppress the rolling phenomenon that comes into contact with the surface.

  Further, in the speaker device according to Embodiment 1 of the present invention, since the magnetic circuit 3 and the inner peripheral end of the diaphragm 21 are close to each other, the length of the voice coil bobbin 23 in the vibration direction (arrow Y direction) of the vibration body 2. Can be shortened. Thereby, the weight of the vibrating body 2 can be reduced and a sensitivity can be improved.

  Further, in the speaker device according to Embodiment 1 of the present invention, the half apex angle of the diaphragm 21 can be reduced, so that the high-frequency resonance frequency can be increased, and the occurrence of resonance in the audible and high frequency ranges. It can be suppressed, the reproduction band in the high frequency region can be expanded, and the acoustic characteristics in the high frequency region can be improved. The “half apex angle of the diaphragm” means an angle formed by the axial direction of the diaphragm and the inclined surface of the diaphragm.

  In the speaker device according to Embodiment 1 of the present invention, a pair of terminals 14 are attached inside the vibrating body 2. Accordingly, it is possible to prevent the sound radiated from the diaphragm 21 from interfering with the reflected wave reflected at the terminal 14, and the interference between the sound radiated from the diaphragm 21 and the reflected wave from the terminal 14. It is possible to prevent the sound emitted from the diaphragm 21 from being canceled. As a result, it is possible to suppress a decrease in the reproduced sound pressure of the sound that should be radiated, to suppress disturbance in the frequency characteristics, to suppress a decrease in the acoustic characteristics of the speaker device, and to obtain good acoustic characteristics.

In the speaker device according to Embodiment 1 of the present invention, the diffuser 4 and the support portion 11 are formed of different members, particularly different metal materials. For example, the diffuser 4 is formed of aluminum (density: 2.7 g / cm ³ ), and the support portion 11 is formed of brass (density: 8.4 g / cm ³ ). By forming the diffuser 4 and the support portion 11 with different metal materials, the resonance frequencies are different from each other. Therefore, it is possible to prevent the diffuser 4 from resonating due to the vibration generated in the housing 1 and transmitted through the support portion 11.

In the speaker device according to the first embodiment of the present invention, the support portion 11 and the members (particularly the yoke 31) constituting the magnetic circuit 3 are formed of different members, particularly different metal materials. For example, the support part 11 is made of brass (density: 8.4 g / cm ³ ), and the magnetic circuit 3 (particularly the yoke 31) is made of iron (density: 7.8 g / cm ³ ). By forming the support member 11 and the members constituting the magnetic circuit 3 with different metal materials, the resonance frequencies are different from each other. Therefore, it is possible to prevent the member (particularly, the yoke 31) constituting the magnetic circuit 3 from resonating due to the vibration generated in the housing 1 and transmitted through the support portion 11.

  Therefore, it is possible to suppress the occurrence of resonance in the members (particularly the yoke 31) constituting the diffuser 4 or the magnetic circuit 3, and further by providing the buffer member 17, the sound from the members constituting the diffuser 4 or the magnetic circuit 3 can be reduced. Can be prevented from being radiated to the outside, and the acoustic characteristics can be improved.

Embodiment 2. FIG.
FIG. 3 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 2 of the present invention. 3, parts corresponding to those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted. The speaker device shown in FIG. 3 is different from the speaker device shown in FIG. 1 in that an inner magnet type magnetic circuit 51 is newly provided in place of the outer magnet type magnetic circuit 3.

  The magnetic circuit 51 is an internal magnet type in which a magnet 54 is sandwiched between a yoke 52 and a plate 53. The yoke 52 is made of a magnetic material such as pure iron, oxygen-free steel, or silicon steel. The yoke 52 has a substantially disk shape, and the outer diameter is substantially equal to the inner diameter of the recess 4 a of the diffuser 4. A through hole 52 a having a substantially cylindrical shape and having an inner diameter substantially the same as the outer diameter of the shaft portion 12 a of the first support member 12 is formed in the approximate center of the yoke 52. On the inner periphery of the through hole 52a, a female screw (not shown) having a predetermined shape for screwing with a male screw formed on the outer periphery of the shaft portion 12a of the first support member 12 is formed in a helical shape at a predetermined pitch. .

  The plate 53 is made of a magnetic material such as iron, for example. The plate 53 has a substantially disk shape. A through hole 53 a having a substantially cylindrical shape and having an inner diameter slightly larger than the outer diameter of the shaft portion 12 a of the first support member 12 is formed in the approximate center of the plate 53. The thickness of the plate 53 is formed so as to be substantially equal to or greater than the thickness of the yoke 52. In the example of FIG. 3, the thickness of the plate 53 is substantially equal to the thickness of the yoke 52.

  The magnet 54 is made of, for example, a permanent magnet such as a rare earth, samarium / cobalt, alnico, or ferrite magnet. The magnet 54 has a substantially disk shape. A through-hole 54 a having a substantially cylindrical shape and having an inner diameter slightly larger than the outer diameter of the shaft portion 12 a of the first support member 12 is formed in the approximate center of the magnet 54. The outer diameter of the magnet 54 is slightly smaller than the outer diameter of the plate 32 and smaller than the inner diameter of the voice coil bobbin 23. The thickness of the magnet 54 is formed so as to be substantially equal to or greater than the thickness of the plate 53. In the example of FIG. 1, the thickness of the magnet 54 is about 1.5 times the thickness of the plate 53. The yoke 52, the plate 53, and the magnet 54 are fixed by, for example, an adhesive or the like so that the central axes in the thickness direction thereof overlap each other.

  Further, on the inner bottom surface of the housing 1, the central axis of the through hole 1 c of the housing 1, the central axis of the second support member 13, and the central axes in the thickness direction of the yoke 52, the plate 53, and the magnet 54 are provided. After the second support member 13, the fixed yoke 52, the plate 53, and the magnet 54 are sequentially placed so that they all coincide, the shaft portion 12 a of the first support member 12 is inserted into the through hole 1 c and The housing 1 and the yoke 52 are inserted into the second support member 13 in sequence, and the male screw of the first support member 12 is screwed into the female screw of the through hole 52a of the yoke 52, whereby the first support member 12 is connected. It is concluded by. As described above, the support portion 11 supports the housing 1 and the magnetic circuit 51 including the yoke 52 so as to face each other. Further, the magnetic circuit 51 is accommodated in a recess 4 a formed in the diffuser 4. That is, the magnetic circuit 51 is surrounded by the diffuser 4.

  According to the speaker device according to the second embodiment of the present invention, even when the internal magnetic type magnetic circuit 51 is provided, as in the speaker device according to the first embodiment of the present invention described above, Since the shock-absorbing member 17 is attached to the outside of the housing 1, vibrations in the housing 1 can be suppressed and the housing 1 is not in direct contact with air that is a sound wave medium. Even if vibration is generated in the body 1, the vibration can be prevented from being radiated to the outside as sound. Therefore, it is possible to suppress the occurrence of a phenomenon in which the sound radiated from the diaphragm 21 is canceled by the sound radiated from the housing 1. As a result, it is possible to suppress a decrease in the reproduced sound pressure of the sound that should be radiated, to suppress disturbance in the frequency characteristics, to suppress a decrease in the acoustic characteristics of the speaker device, and to obtain good acoustic characteristics. In addition, when the sound from the outside acts on the buffer member 17, particularly when the buffer member 17 is a sound absorbing member, the above-described sound is converted into thermal energy, and a reflected wave is generated from the buffer member 17. Can be deterred. About another point, it is the same as that of the case of the speaker apparatus which concerns on Embodiment 1 of above-described this invention.

Embodiment 3 FIG.
FIG. 4 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 3 of the present invention. 4, parts corresponding to those in FIG. 3 are given the same reference numerals, and descriptions thereof are omitted. The speaker device shown in FIG. 4 is different from the speaker device shown in FIG. 3 in that a magnetic circuit 61 is newly provided in place of the magnetic circuit 51.

  The magnetic circuit 61 is different from the magnetic circuit 51 in that a yoke 62 is newly provided in place of the yoke 52. The yoke 62 is made of a magnetic material such as pure iron, oxygen-free steel, or silicon steel. The yoke 62 has a substantially frustoconical shape whose outer peripheral portion extends toward the housing 1 and has a hollow shape. The outer diameter of the yoke 62 is smaller than the inner diameter of the recess 4 a of the diffuser 4. A through-hole 62 a having a substantially cylindrical shape and having an inner diameter substantially the same as the outer diameter of the shaft portion 12 a of the first support member 12 is formed in the approximate center of the yoke 62. On the inner periphery of the through-hole 62a, a female screw (not shown) having a predetermined shape for screwing with a male screw formed on the outer periphery of the shaft portion 12a of the first support member 12 is formed in a spiral at a predetermined pitch. . The yoke 62, the plate 53, and the magnet 54 are fixed by, for example, an adhesive or the like so that the central axes in the thickness direction of each other overlap.

  Further, on the inner bottom surface of the housing 1, the central axis of the through hole 1 c of the housing 1, the central axis of the second support member 13, and the central axes in the thickness direction of the yoke 62, the plate 53, and the magnet 54 are provided. After the second support member 13, the fixed yoke 62, the plate 53, and the magnet 54 are sequentially placed so that they all coincide, the shaft portion 12 a of the first support member 12 is inserted into the through hole 1 c and The housing 1 and the yoke 62 are inserted into the second support member 13 sequentially, and the male screw of the first support member 12 is screwed into the female screw of the through hole 62a of the yoke 62, whereby the housing 1 and the yoke 62 are connected. It is concluded by. As described above, the support portion 11 supports the housing 1 and the magnetic circuit 61 including the yoke 62 so as to face each other. Further, the magnetic circuit 61 is accommodated in a recess 4 a formed in the diffuser 4. That is, the magnetic circuit 61 is surrounded by the diffuser 4.

  According to the speaker device according to the third embodiment of the present invention, the buffer member 17 is attached to the outside of the housing 1 in the same manner as the speaker devices according to the first and second embodiments of the present invention described above. Therefore, the vibration in the housing 1 can be suppressed, and the housing 1 is not in direct contact with the air that is a sound wave medium. Radiation to the outside can be suppressed. Therefore, it is possible to suppress the occurrence of a phenomenon in which the sound radiated from the diaphragm 21 is canceled by the sound radiated from the housing 1. As a result, it is possible to suppress a decrease in the reproduced sound pressure of the sound that should be radiated, to suppress disturbance in the frequency characteristics, to suppress a decrease in the acoustic characteristics of the speaker device, and to obtain good acoustic characteristics. In addition, when the sound from the outside acts on the buffer member 17, particularly when the buffer member 17 is a sound absorbing member, the above-described sound is converted into thermal energy, and a reflected wave is generated from the buffer member 17. Can be deterred. About another point, it is the same as that of the case of the speaker apparatus which concerns on Embodiment 1 and 2 of above-described this invention.

Embodiment 4 FIG.
FIG. 5 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 3 of the present invention. In FIG. 5, parts corresponding to those in FIG. 3 are assigned the same reference numerals, and explanations thereof are omitted. The speaker device shown in FIG. 5 is different from the speaker device shown in FIG. 3 in that a magnetic circuit 71 is newly provided in place of the magnetic circuit 51.

  The magnetic circuit 71 is different from the magnetic circuit 51 in that a yoke 72 is newly provided in place of the yoke 52. The yoke 72 is made of a magnetic material such as pure iron, oxygen-free steel, or silicon steel. The yoke 72 is configured by integrally forming a head portion 72a, a side portion 72b, and a bottom portion 72c. The head 72a has a substantially disk shape. The side part 72b is exhibiting the substantially annular shape, and is connected to the peripheral lower end of the head part 72a. The bottom portion 72c has a substantially annular shape and is connected to the lower end of the side portion 72b. That is, the yoke 72 hangs down from the lower end of the periphery of the head 72a to form a side portion 72b, and then extends horizontally toward the central axis of the head 72a to form a bottom portion 72c.

  The outer diameter of the yoke 72 is smaller than the inner diameter of the recess 4 a of the diffuser 4. A through hole 72aa having a substantially columnar shape and having an inner diameter substantially the same as the outer diameter of the shaft portion 12a of the first support member 12 is formed in the approximate center of the head 72a constituting the yoke 72. On the inner periphery of the through hole 72aa, a female screw (not shown) having a predetermined shape for screwing with a male screw formed on the outer periphery of the shaft portion 12a of the first support member 12 is formed in a helical shape at a predetermined pitch. . The yoke 72, the plate 53, and the magnet 54 are fixed by, for example, an adhesive or the like so that the central axes in the thickness direction thereof overlap each other.

  Further, on the inner bottom surface of the housing 1, the central axis of the through hole 1 c of the housing 1, the central axis of the second support member 13, and the central axes in the thickness direction of the yoke 72, the plate 53, and the magnet 54 are provided. After the second support member 13, the fixed yoke 72, the plate 53, and the magnet 54 are sequentially placed so that they all coincide, the shaft portion 12 a of the first support member 12 is inserted into the through hole 1 c and The housing 1 and the yoke 72 are inserted into the second support member 13 sequentially, and the male screw of the first support member 12 is screwed into the female screw of the through hole 72aa of the head 72a constituting the yoke 72. Fastened by the first support member 12. As described above, the support portion 11 supports the housing 1 and the magnetic circuit 71 including the yoke 72 so as to face each other.

  Further, the magnetic circuit 71 is accommodated in a recess 4 a formed in the diffuser 4. That is, the magnetic circuit 71 is surrounded by the diffuser 4. Further, the connecting portion between the side portion 72 b and the bottom portion 72 c of the yoke 72 is in contact with the upper surface and the side surface of the damper support member 41. The outer peripheral surface of the plate 53 and the inner peripheral surface of the bottom 72c constituting the yoke 72 form a magnetic gap. A voice coil 24 is disposed in the magnetic gap.

  According to the speaker device according to the fourth embodiment of the present invention, the buffer member 17 is attached to the outside of the housing 1 in the same manner as the speaker device according to the first to third embodiments of the present invention described above. Therefore, the vibration in the housing 1 can be suppressed, and the housing 1 is not in direct contact with the air that is a sound wave medium. Radiation to the outside can be suppressed. Therefore, it is possible to suppress the occurrence of a phenomenon in which the sound radiated from the diaphragm 21 is canceled by the sound radiated from the housing 1. As a result, it is possible to suppress a decrease in the reproduced sound pressure of the sound that should be radiated, to suppress disturbance in the frequency characteristics, to suppress a decrease in the acoustic characteristics of the speaker device, and to obtain good acoustic characteristics. In addition, when the sound from the outside acts on the buffer member 17, particularly when the buffer member 17 is a sound absorbing member, the above-described sound is converted into thermal energy, and a reflected wave is generated from the buffer member 17. Can be deterred. Other points are the same as those of the speaker device according to the first to third embodiments of the present invention described above.

Embodiment 5 FIG.
FIG. 6 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 5 of the present invention. In FIG. 6, parts corresponding to those in FIG. The speaker device shown in FIG. 6 is different from the speaker device shown in FIG. 3 in that a support portion 81 and a magnetic circuit 82 are newly provided in place of the support portion 11 and the magnetic circuit 51, respectively.

  The difference between the support portion 81 and the support portion 11 is that a first support member 83 is newly provided in place of the first support member 12. The first support member 83 is made of, for example, substantially the same material as the casing 1 described above. The first support member 83 is configured by integrally forming a shaft portion 83a and a head portion 83b. The head 83 b has the same shape as the head 12 b of the first support member 12. The shaft portion 83 a has a substantially cylindrical shape and is shorter than the length of the shaft portion 12 a of the first support member 12. Specifically, the length of the shaft portion 83a is determined when the shaft portion 83a of the first support member 83 is sequentially inserted into the through hole 1c and the second support member 13 of the housing 1, as will be described later. The length of the shaft 83 a is such that the tip of the shaft 83 a is located on the same plane as the tip of the second support member 13. Further, the outer periphery of the shaft portion 83a is different from the outer periphery of the shaft portion 12a, and no male screw is formed.

  The magnetic circuit 82 is an internal magnet type in which a magnet 86 is sandwiched between a yoke 84 and a plate 85. The yoke 84 is made of a magnetic material such as pure iron, oxygen-free steel, or silicon steel. The yoke 84 is configured by integrally forming a head portion 84a and a side portion 84b. The head portion 84a has a substantially disk shape. The side part 84b is exhibiting the substantially annular shape, and is connected to the peripheral lower end of the head part 84a. The yoke 84 has an outer diameter smaller than the inner diameter of the recess 4 a of the diffuser 4.

  The plate 85 is made of a magnetic material such as iron, for example. The plate 85 has a substantially disk shape. The thickness of the plate 85 is formed to be substantially equal to the thickness of the yoke 84 or thinner than the thickness of the yoke 84. In the example of FIG. 6, the thickness of the plate 85 is about one half of the thickness of the yoke 84.

  The magnet 86 is made of, for example, a permanent magnet such as a rare earth, samarium / cobalt, alnico, or ferrite magnet. The magnet 86 has a substantially disk shape. The outer diameter of the magnet 86 is substantially equal to the outer diameter of the plate 85 and is smaller than the inner diameter of the voice coil bobbin 23. The magnet 86 is formed so that the thickness of the magnet 86 is substantially equal to or greater than the thickness of the plate 85. In the example of FIG. 6, the thickness of the magnet 86 is about 1.5 times the thickness of the plate 85. The yoke 84, the plate 85, and the magnet 86 are fixed by, for example, an adhesive or the like so that the central axes in the thickness direction of each other overlap each other.

  Further, on the inner bottom surface of the housing 1, the central axis of the through hole 1 c of the housing 1, the central axis of the second support member 13, and the central axes in the thickness direction of the yoke 84, the plate 85, and the magnet 86 are provided. After the second support member 13 and the yoke 84, the plate 85, and the magnet 86, which are adhered to each other and the adhesive is applied to the lower surface of the plate 85, are sequentially placed so that they all substantially coincide, The shaft portion 83a of the support member 83 is sequentially inserted into the through hole 1c and the second support member 13, whereby the housing 1 and the magnetic circuit 82 including the plate 85 are connected to the first support member 83 and the second support member 83. The support member 13 is fixed. As described above, the support portion 81 supports the housing 1 and the magnetic circuit 82 including the plate 85 so as to face each other.

  Further, the magnetic circuit 82 is accommodated in a recess 4 a formed in the diffuser 4. That is, the magnetic circuit 82 is surrounded by the diffuser 4. Further, the side portion 84 b of the yoke 84 is in contact with the upper surface and the side surface of the damper support member 41. The outer peripheral surface of the plate 85 and the inner peripheral surface of the side portion 84b constituting the yoke 84 form a magnetic gap. A voice coil 24 is disposed in the magnetic gap.

  According to the speaker device according to the fifth embodiment of the present invention, the buffer member 17 is attached to the outside of the housing 1 in the same manner as the speaker devices according to the first to fourth embodiments of the present invention described above. Therefore, the vibration in the housing 1 can be suppressed, and the housing 1 is not in direct contact with the air that is a sound wave medium. Radiation to the outside can be suppressed. Therefore, it is possible to suppress the occurrence of a phenomenon in which the sound radiated from the diaphragm 21 is canceled by the sound radiated from the housing 1. As a result, it is possible to suppress a decrease in the reproduced sound pressure of the sound that should be radiated, to suppress disturbance in the frequency characteristics, to suppress a decrease in the acoustic characteristics of the speaker device, and to obtain good acoustic characteristics. In addition, when the sound from the outside acts on the buffer member 17, particularly when the buffer member 17 is a sound absorbing member, the above-described sound is converted into thermal energy, and a reflected wave is generated from the buffer member 17. Can be deterred. About another point, it is the same as that of the case of the speaker apparatus based on above-mentioned Embodiment 1 thru | or 4 of this invention.

Embodiment 6 FIG.
FIG. 7 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 6 of the present invention. 7, parts corresponding to those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted. The speaker device shown in FIG. 7 is different from the speaker device shown in FIG. 1 in that a protective net 91 is newly provided so as to cover the space between the diffuser 4 and the housing 1. The protective net 91 has a substantially trapezoidal cross section. That is, the lower end of the protective net 91 has an outer diameter that can be placed on the edge support portion 1ab formed on the upper end 1a of the housing 1. On the other hand, the upper end of the protective net 91 has an outer diameter that can be connected to the lower end of the diffuser 4.

  Since the protective net 91 is uniformly formed in the circumferential direction of the space between the diffuser 4 and the housing 1, the speaker device can be provided even if the protective net 91 is arranged around the diaphragm 21. The sound radiated from the sound can be propagated without causing directivity. In addition, since the buffer member 17 is attached to the outside of the housing 1, generation or reflection of unnecessary sound based on vibration generated in the housing 1 can be suppressed, and good acoustic characteristics can be obtained. About another point, it is the same as that of the case of the speaker apparatus which concerns on Embodiment 1 of above-described this invention.

Embodiment 7 FIG.
FIG. 8 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 7 of the present invention. In FIG. 8, parts corresponding to those in FIG. The speaker device shown in FIG. 8 is different from the speaker device shown in FIG. 1 in that a plurality of protective members 92 are newly provided so as to cover the space between the diffuser 4 and the housing 1. Each protection member 92 is a rod-shaped member, and is attached at equal intervals in the circumferential direction of the diffuser 4. The lower end of each protection member 92 extends to the vicinity of the upper end 1 a of the housing 1.

  The plurality of protection members 92 are uniformly formed in the circumferential direction of the space between the diffuser 4 and the casing 1 with a thickness that does not adversely affect the acoustic characteristics. Even if it is arranged around the diaphragm 21, the sound radiated from the speaker device can be propagated without causing directivity. In addition, since the buffer member 17 is attached to the outside of the housing 1, generation or reflection of unnecessary sound based on vibration generated in the housing 1 can be suppressed, and good acoustic characteristics can be obtained. About another point, it is the same as that of the case of the speaker apparatus which concerns on Embodiment 1 of above-described this invention.

  By the way, when the protection member 92 according to the seventh embodiment extends from the housing 1 to the magnetic circuit 3 and is supported by both the housing 1 and the magnetic circuit 3 or the diffuser 4, the following is performed. There are problems. That is, when the voice coil 24 vibrates, the damper 25 vibrates following the vibration of the diaphragm 21, so that the vibration of the damper 25 is transmitted to the protective member 92, causing resonance or the like, and the protective member 92 generates sound waves. May occur.

  However, in the seventh embodiment, since the protective member 92 has the shape shown in FIG. 8, it is possible to prevent the protective member 52 from generating sound waves due to resonance or the like and adversely affecting the acoustic characteristics. it can. Here, FIG. 9 shows an example of the acoustic characteristics of the speaker device for which an experiment relating to the protective member 92 was conducted. In FIG. 9, a curve a is a characteristic curve when the protection member 92 is provided in the speaker device as shown in FIG. 8, and a curve b is a characteristic curve when the protection member 92 is not provided in the speaker device. None of the speaker devices is provided with a vibration damping member, a sound absorbing member, or the like. From FIG. 9, it can be seen that even if the protective member 52 is provided, the acoustic characteristics are hardly affected.

Embodiment 8 FIG.
FIG. 10 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 8 of the present invention. 10, parts corresponding to those in FIG. 1 are given the same reference numerals, and descriptions thereof are omitted. The speaker device shown in FIG. 10 is different from the speaker device shown in FIG. 1 in that the buffer member 17 is removed and the buffer member 101 is attached to the outside of the diffuser 4.

  A buffer member 101 is fixed to the outside of the diffuser 4 with an adhesive or the like. The buffer member 101 transmits the vibration of the magnetic circuit 3 and the vibration of the housing 1 transmitted to the magnetic circuit 2 via the support member 11 to the diffuser 4 and radiates it as sound to the outside of the speaker device. It is for deterrence. The material of the buffer member 101 is the same as the material of the buffer member 17. Further, the buffer member 101 may be the above-described echo suppression member.

  In the speaker device having the above configuration, when an audio signal (audio current) is supplied, the audio current is supplied to the voice coil 24 through the pair of external connection lines 16, the pair of terminals 14, and the pair of tinsel wires 15. . Thus, the central axis direction of the speaker device (Y direction shown in FIG. 10) is based on the electromagnetic force (Lorentz force) between the magnetic flux based on the magnet 33 constituting the magnetic circuit 3 and the voice current supplied to the voice coil 24. ) Is induced in the voice coil 24. This driving force is transmitted to the diaphragm 21 via the voice coil bobbin 23. The vibration plate 21 receives the action of the driving force and is elastically supported by the edge 22 and the damper 25 and vibrates in the Y direction shown in FIG. 10, and the sound corresponding to the sound current is in the front surface (acoustic radiation direction). Radiates towards the space.

  When the driving force described above is induced in the voice coil 24, a force in a direction opposite to the driving force induced in the voice coil 24 acts in the magnetic circuit 3 due to the reaction. However, since the magnetic circuit 3 is surrounded by the diffuser 4 and the buffer member 101, vibrations in the magnetic circuit 3 can be suppressed and the diffuser 4 is not in direct contact with the air that is a sound wave medium. Even if the vibration of the magnetic circuit 3 is transmitted to the diffuser 4, the vibration can be prevented from being radiated to the outside as sound. Therefore, it is possible to suppress the occurrence of a phenomenon such as the sound radiated from the diaphragm 21 being canceled by the sound radiated from the diffuser 4. As a result, it is possible to suppress a decrease in the reproduced sound pressure of the sound that should be radiated, to suppress disturbance in the frequency characteristics, to suppress a decrease in the acoustic characteristics of the speaker device, and to obtain good acoustic characteristics. In addition, when the sound from the outside acts on the buffer member 101, particularly when the buffer member 101 is a sound absorbing member, the sound described above is converted into thermal energy, and a reflected wave is generated from the buffer member 101. Can be deterred. About another point, it is the same as that of the case of the speaker apparatus which concerns on Embodiment 1 of above-described this invention.

Embodiment 9 FIG.
FIG. 11 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 9 of the present invention. In FIG. 11, parts corresponding to those in FIG. 10 are assigned the same reference numerals and explanations thereof are omitted. The speaker device shown in FIG. 11 is different from the speaker device shown in FIG. 10 in that the buffer member 102 is fixed to the inner surface of the recess 4a formed in the diffuser 4 with an adhesive or the like.

  The buffer member 102 is used to prevent the vibration of the magnetic circuit 3 from being transmitted to the diffuser 4 and radiated as sound to the outside of the speaker device. The material of the buffer member 102 is the same as the material of the buffer members 17 and 101. Further, the buffer member 102 may be the above-described echo suppression member.

  In the speaker device having the above configuration, when an audio signal (audio current) is supplied, the audio current is supplied to the voice coil 24 through the pair of external connection lines 16, the pair of terminals 14, and the pair of tinsel wires 15. . Thus, the central axis direction of the speaker device (Y direction shown in FIG. 11) is based on the electromagnetic force (Lorentz force) between the magnetic flux based on the magnet 33 constituting the magnetic circuit 3 and the voice current supplied to the voice coil 24. ) Is induced in the voice coil 24. This driving force is transmitted to the diaphragm 21 via the voice coil bobbin 23. The diaphragm 21 is elastically supported by the edge 22 and the damper 25 under the action of the driving force, vibrates in the Y direction shown in FIG. 11, and the sound corresponding to the audio current is in the front surface (acoustic radiation direction). Radiates towards the space.

  When the driving force described above is induced in the voice coil 24, a force in a direction opposite to the driving force induced in the voice coil 24 acts in the magnetic circuit 3 due to the reaction. However, since the magnetic circuit 3 is surrounded by the buffer member 102, the diffuser 4, and the buffer member 101, the vibration transmission path from the magnetic circuit 3 to the diffuser 4 is cut off by the buffer member 102, and the vibration in the magnetic circuit 3 is suppressed. Can be deterred. Further, since the diffuser 4 is not in direct contact with the air that is the sound wave medium, even if vibration is generated in the magnetic circuit 3 and transmitted to the diffuser 4 through the buffer member 102, the vibration is radiated to the outside as sound. Can be suppressed.

  Therefore, it is possible to suppress the occurrence of a phenomenon such as the sound radiated from the diaphragm 21 being canceled by the sound radiated from the diffuser 4. As a result, it is possible to suppress a decrease in the reproduced sound pressure of the sound that should be radiated, to suppress disturbance in the frequency characteristics, to suppress a decrease in the acoustic characteristics of the speaker device, and to obtain good acoustic characteristics. In addition, when the sound from the outside acts on the buffer member 101, particularly when the buffer member 101 is a sound absorbing member, the sound described above is converted into thermal energy, and a reflected wave is generated from the buffer member 101. Can be deterred. About another point, it is the same as that of the case of the speaker apparatus which concerns on Embodiment 1 of above-described this invention.

Embodiment 10 FIG.
FIG. 12 is a cross-sectional view showing a schematic configuration of the speaker device according to Embodiment 10 of the present invention. In FIG. 12, parts corresponding to those in FIG. 11 are given the same reference numerals, and descriptions thereof are omitted. The speaker device shown in FIG. 12 is different from the speaker device shown in FIG. 11 in that the buffer member 17 according to the first embodiment is fixed to the outside of the housing 1 with an adhesive or the like.

  In the speaker device having the above configuration, when an audio signal (audio current) is supplied, the audio current is supplied to the voice coil 24 through the pair of external connection lines 16, the pair of terminals 14, and the pair of tinsel wires 15. . Thereby, the central axis direction of the speaker device (Y direction shown in FIG. 12) based on the electromagnetic force (Lorentz force) between the magnetic flux based on the magnet 33 constituting the magnetic circuit 3 and the sound current supplied to the voice coil 24. ) Is induced in the voice coil 24. This driving force is transmitted to the diaphragm 21 via the voice coil bobbin 23. The vibration plate 21 receives the action of the driving force and is elastically supported by the edge 22 and the damper 25 and vibrates in the Y direction shown in FIG. 12, and the sound corresponding to the sound current is in the front surface (acoustic radiation direction). Radiates towards the space.

  The air pressure generated when the diaphragm 21 vibrates acts on the housing 1 that supports the outer peripheral edge of the diaphragm 21. On the other hand, when the driving force described above is induced in the voice coil 24, a force in the direction opposite to the driving force induced in the voice coil 24 acts in the magnetic circuit 3 due to the reaction. However, the buffer member 17 is attached to the outside of the housing 1, and the magnetic circuit 3 is surrounded by the buffer member 102, the diffuser 4, and the buffer member 101.

  Therefore, the vibration transmission path from the magnetic circuit 3 to the diffuser 4 is cut off by the buffer member 102, so that the vibration in the magnetic circuit 3 can be suppressed and the vibration in the housing 1 can be suppressed. Further, the vibration of the housing 1 is transmitted to the magnetic circuit 3 through the support member 11, and conversely, the vibration of the magnetic circuit 3 is prevented from being transmitted to the housing 1 through the support member 11. Can do.

  Further, since the diffuser 4 is not in direct contact with the air that is the sound wave medium, even if vibration is generated in the magnetic circuit 3 and transmitted to the diffuser 4 through the buffer member 102, the vibration is emitted to the outside as sound. Can be suppressed. Moreover, since the housing | casing 1 does not touch air directly, even if a vibration generate | occur | produces in the housing | casing 1, it can suppress that the vibration is radiated | emitted outside as a sound.

  Therefore, it is possible to suppress the occurrence of a phenomenon such as the sound radiated from the diaphragm 21 being canceled by the sound radiated from the housing 1 or the diffuser 4. As a result, it is possible to suppress a decrease in the reproduced sound pressure of the sound that should be radiated, to suppress disturbance in the frequency characteristics, to suppress a decrease in the acoustic characteristics of the speaker device, and to obtain good acoustic characteristics. In addition, when the sound from the outside acts on the buffer members 17 and 101, particularly when the buffer members 17 and 101 are sound absorbing members, the above-described sound is converted into heat energy and reflected from the buffer members 17 and 101. Generation of waves can be suppressed. About another point, it is the same as that of the case of the speaker apparatus which concerns on Embodiment 1 of above-described this invention.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention.

  For example, in the first to seventh embodiments described above, the example in which the buffer member 17 is attached to the outside of the housing 1 is shown. However, the present invention is not limited to this, and the housing 1 is embedded in a wall or the like made of a member that hardly transmits vibration. But it ’s okay.

  In each of the above embodiments, a magnetic fluid may be provided between the magnetic circuit and the voice coil bobbin or voice coil. By providing the magnetic fluid in this way, it is possible to increase the electromagnetic force acting on the voice coil, to dissipate heat by transmitting the heat (Joule heat) generated in the voice coil to the plate, and the like.

  Further, in each of the above-described embodiments, the example in which the planar shape of the speaker device has a substantially circular shape has been shown, but the present invention is not limited to this, and the planar shape of the speaker device is substantially rectangular, substantially elliptical, or The polygonal shape may be exhibited. Furthermore, in each of the above-described embodiments, since the planar shape of the speaker device has a substantially circular shape, the yoke, the plate, and the magnet have been shown to have a substantially disk shape or a substantially annular shape. It is not limited to this. For example, when the planar shape of the speaker device has a substantially rectangular shape, the yoke, the plate, and the magnet may have a substantially rectangular shape or a substantially rectangular ring shape.

  Further, in each of the above-described embodiments, an example in which the magnetic circuit is configured by a single plate or magnet having a substantially ring shape has been described, but the present invention is not limited thereto. Any or all of the plates and magnets may be composed of a plurality of plate materials or a plurality of magnets having a substantially arc shape or a substantially rectangular shape.

  Further, in each of the above-described embodiments, the damper 25 is shown as an example in which corrugation is formed concentrically with the inner peripheral edge 21a of the diaphragm 21, but the invention is not limited to this, and the damper 25 is formed with corrugation. You don't have to.

  In addition, each of the above-described embodiments can divert each other's technology as long as there is no particular contradiction or problem in its purpose and configuration.

It is sectional drawing which shows schematic structure of the speaker apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows an example of the acoustic characteristic of the speaker apparatus shown in FIG. It is sectional drawing which shows schematic structure of the speaker apparatus which concerns on Embodiment 2 of this invention. It is sectional drawing which shows schematic structure of the speaker apparatus which concerns on Embodiment 3 of this invention. It is sectional drawing which shows schematic structure of the speaker apparatus which concerns on Embodiment 4 of this invention. It is sectional drawing which shows schematic structure of the speaker apparatus which concerns on Embodiment 5 of this invention. It is sectional drawing which shows schematic structure of the speaker apparatus which concerns on Embodiment 6 of this invention. It is sectional drawing which shows schematic structure of the speaker apparatus which concerns on Embodiment 7 of this invention. It is a figure which shows an example of the acoustic characteristic of the speaker apparatus shown in FIG. It is sectional drawing which shows schematic structure of the speaker apparatus which concerns on Embodiment 8 of this invention. It is sectional drawing which shows schematic structure of the speaker apparatus which concerns on Embodiment 9 of this invention. It is sectional drawing which shows schematic structure of the speaker apparatus based on Embodiment 10 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Housing, 1a ... Upper end, 1aa ... Upper end surface, 1ab ... Edge support part, 1b ... Bottom part, 1ba ... Recessed part, 1c, 1d ... Through-hole, 2 ... Vibrating body, 3, 51, 61, 71, 82 ... Magnetic circuit, 4 ... Diffuser, 4a ... Recess, 11, 81 ... Support part, 12, 83 ... First support member, 12a, 83a ... Shaft part, 12b, 83b ... Head part, 13 ... Second support part, DESCRIPTION OF SYMBOLS 14 ... Terminal, 15 ... Kinshi wire, 16 ... External connection wire, 17, 101, 102 ... Buffer member, 21 ... Diaphragm, 22 ... Edge, 23 ... Voice coil bobbin, 24 ... Voice coil, 25 ... Damper, 31, 52 , 62, 72, 84 ... yoke, 31a ... main body, 31aa ... through hole, 31b ... flange (outer ring), 32, 53, 85 ... plate, 33, 54, 86 ... magnet, 41 ... damper support member, 52a, 53a, 54a, 2a, 72Aa ... through hole, 72a ... head, 72b ... side, 72c ... bottom, 84a ... head, 84b ... side, 91 ... protective net, 92 ... protective member

Claims (19)

A vibrating body, a housing that supports an outer peripheral portion of the vibrating body, a magnetic circuit that is disposed so as to face the housing, and a support portion.
The vibrating body is disposed between the housing and the magnetic circuit,
The housing and the magnetic circuit are supported by the support portion,
A speaker device, wherein a buffer member is attached to the outside of the housing.   The speaker device according to claim 1, further comprising a diffuser formed so as to surround the magnetic circuit. A vibrating body, a housing that supports an outer peripheral portion of the vibrating body, a magnetic circuit disposed so as to face the housing, a support portion, and a diffuser
The vibrating body is disposed between the housing and the magnetic circuit,
The housing and the magnetic circuit are supported by the support portion,
The diffuser is provided so as to cover the magnetic circuit,
A speaker device, wherein a buffer member is attached to the outside of the diffuser.   The speaker device according to any one of claims 1 to 3, wherein an open space is formed on an acoustic radiation side of the diaphragm constituting the vibrating body.   5. The speaker device according to claim 1, wherein the support portion passes through the inside of the vibrating body and extends from the housing toward the magnetic circuit.   The speaker device according to claim 1, wherein the buffer member is a vibration damping member.   The speaker device according to claim 1, wherein the buffer member is a sound absorbing member.   The speaker device according to claim 1, wherein the buffer member is an echo suppression member.   The speaker device according to claim 1, wherein a terminal is provided inside the vibrating body. The magnetic circuit is an outer magnet type magnetic circuit including a magnet and a yoke,
The speaker device according to claim 1, wherein the member supported by the support portion is the yoke. The magnetic circuit is an outer magnet type magnetic circuit including a yoke, a magnet, and a plate disposed on a lower surface side of the magnet,
The speaker device according to claim 1, wherein the member supported by the support portion is the yoke. The magnetic circuit is an internal magnetic circuit including a yoke, a magnet, and a plate disposed on the lower surface side of the magnet,
The speaker device according to claim 1, wherein the member supported by the support portion is the yoke. The magnetic circuit is an internal magnetic circuit including a yoke, a magnet, and a plate disposed on the lower surface side of the magnet,
The speaker device according to claim 1, wherein the member supported by the support portion is the plate.   The speaker device according to any one of claims 1 to 13, wherein a through hole for allowing the inside of the vibrating body to communicate with the outside is formed in the housing. The vibrating body includes a diaphragm, an edge, a voice coil bobbin, and a damper.
An outer peripheral edge of the diaphragm is supported by the housing via the edge;
An inner periphery of the diaphragm is connected to an outer periphery of the voice coil bobbin;
An inner periphery of the damper is connected to an outer periphery of the boil coil bobbin;
The speaker device according to claim 1, wherein an outer peripheral edge of the damper is connected to a member constituting the magnetic circuit.   The speaker device according to claim 15, wherein the diaphragm and the edge are integrally formed. The magnetic circuit is an outer magnet type magnetic circuit comprising a yoke, a magnet, a plate, and a damper support member disposed on the lower surface side of the plate,
The speaker device according to claim 15 or 16, wherein the member to which an outer peripheral edge of the damper is connected is the damper support member.   The speaker device according to claim 1, wherein a plurality of the support portions are arranged.   The speaker device according to any one of claims 1 to 18, wherein a protective net or a protective member is disposed so as to surround a periphery of the diaphragm constituting the vibrating body.

Images