Speaker

Abstract

To provide a loudspeaker in which a magnetic circuit can be stably positioned and held in a magnetic circuit holding portion and excessive stress can be prevented from acting on the magnetic circuit holding portion.SOLUTION: In a loudspeaker 1, an outer circumferential structure portion of a magnetic circuit 30 is held inside a holding recession 11a of a magnetic circuit holding portion 11 of a frame. A pressing portion 40 is arranged by threadedly mounted to an attachment surface 15 formed in the magnetic circuit holding portion 11, with the use of fixing screws 17. Elastically deformable pressing pieces 42 are arranged in the pressing portion 40. A restriction surface 32d of the outer circumferential structure portion of the magnetic circuit 30 is pressed by the pressing pieces 42. The magnetic circuit 30 is stably held in the magnetic circuit holding portion 11, and the pressing pieces 42 is elastically deformed, resultantly acting of excessive stress on the frame 10 can be suppressed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a speaker having a structure in which a magnetic circuit can be stably held on a frame and distortion of the frame holding the magnetic circuit is unlikely to occur. [Background technology]

[0002] Patent Document 1 describes an invention related to a speaker. This speaker has a bottom chamber and a frame. A magnetic circuit is held in the bottom chamber, and a diaphragm and a damper are supported by the frame. The magnetic circuit has a magnet on the inner periphery and a yoke on the outer periphery, and two magnetic gaps are formed in the front and back between the outer periphery of the magnet and the inner periphery of the yoke. Two voice coils are wound around a coil bobbin fixed to the diaphragm, and the voice coils are located in the respective magnetic gaps.

[0003] A bottom is formed on the frame, and this bottom is fixed to the front end face of the bottom chamber with a mounting screw. The inner diameter of the bottom of the frame is slightly smaller than the outer diameter of the yoke held in the bottom chamber, and the front end face of the yoke is pressed from the front by the inner diameter part of the bottom. The magnets that make up the magnetic circuit are attracted and fixed to the bottom chamber by their magnetic force, but the yoke is held in a position restricted in the thrust direction within the bottom chamber by its front end face being pressed by the inner diameter part of the bottom of the frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-215090 Summary of the Invention [Problem to be solved by the invention]

[0005] In the speaker described in Patent Document 1, due to the dimensional tolerances of the bottom chamber and the frame, it is difficult to align the front end face of the bottom chamber, to which the bottom of the frame is fixed, with the front end face of the yoke in the thrust direction, and it is unavoidable that a step will occur between the front end face of the bottom chamber and the front end face of the yoke.

[0006] If the front end face of the bottom chamber is set back from the front end face of the yoke, the inner diameter part of the bottom abuts against the front end face of the yoke, which creates a gap between the bottom and the front end face of the bottom chamber, and the frame and the bottom chamber cannot be stably connected by the mounting screw. In addition, the frame is easily distorted by the tightening force of the mounting screw, which may cause the frame to deform and even break. In addition, the distortion of the frame may adversely affect the vibration characteristics of the diaphragm supported by the frame. Conversely, if the front end face of the yoke is set back from the front end face of the bottom chamber, the magnetic circuit cannot be stably restricted in the thrust direction, and the position of the magnetic circuit may be displaced when external vibration acts on it.

[0007] The present invention is devised to solve the above-mentioned problems of the conventional technology, and aims to provide a speaker that can stably hold a magnetic circuit on a frame and has a structure that can easily prevent large stress from acting on the frame even if a step is formed between the mounting surface of the frame and the front end face of the magnetic circuit. [Means for solving the problem]

[0008] The present invention provides a speaker including a frame, a vibrating body supported by the frame so as to be capable of vibrating freely, a coil that applies a vibration force to the vibrating body, and a magnetic circuit that is located behind the vibrating body and applies a magnetic field to the coil, the magnetic circuit is held by a magnetic circuit holding portion provided on the frame, The magnetic circuit holding portion has a mounting surface facing forward, The magnetic circuit is provided with a restriction surface facing forward, A pressing portion is screwed to the mounting surface, and the pressing portion is The pressing piece that contacts the regulating surface the pressing piece and the screw fastening portion are integrally formed, and the pressing piece and the screw fastening portion are arranged so that the pressing piece and the screw fastening portion are not positioned on a common radial line extending from a center of the magnetic circuit, The pressing piece and the regulating surface have a feature that the contact portions are provided at a plurality of positions spaced apart from each other.

[0009] In the speaker of the present invention, the magnetic circuit is inserted rearward into the magnetic circuit holding portion and fixed therein.

[0011] In the speaker of the present invention, the pressing portion is provided separately from the frame.

[0012] Alternatively, in the speaker of the present invention, the pressing portion is provided integrally with the frame.

[0013] In the speaker of the present invention, a damper support member to which an outer periphery of a damper supporting the vibrating body is fixed is provided separately from the frame, The pressing portion is sandwiched between the mounting surface and the damper support member.

[0014] Alternatively, in the speaker of the present invention, a damper support member to which an outer periphery of a damper supporting the vibrating body is fixed is provided separately from the frame, The pressing portion is formed integrally with the damper support member.

[0015] In the speaker of the present invention, the frame has a vibrating body support member that supports the vibrating body, and a magnetic circuit holding member that has the magnetic circuit holding portion, The pressing portion is formed integrally with the vibration body support member.

[0016] Alternatively, in the speaker of the present invention, the frame has a vibrating body support member that supports the vibrating body and a magnetic circuit holding member that holds the magnetic circuit, The pressing portion is sandwiched between the mounting surface and the vibration body support member. Effect of the Invention

[0017] In the speaker of the present invention, the restricting surface of the magnetic circuit is held by a pressing piece while the magnetic circuit is held by the magnetic circuit holding part located at the rear of the frame. Therefore, the magnetic circuit can be stably held by the frame. In addition, since the abutment portions between the pressing piece and the restricting surface are provided at multiple locations with spaces between them, even if a step is formed between the restricting surface of the magnetic circuit and the mounting surface of the magnetic circuit holding part, it is possible to prevent a large stress from acting on the frame due to deformation of the pressing piece. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a half-sectional perspective view of a speaker according to a first embodiment of the present invention, taken along a cutting plane including a central axis; [Diagram 2] FIG. 2 is a partial cross-sectional view of the speaker according to the first embodiment taken along line II-II of the loudspeaker; [Diagram 3] FIG. 3 is a partial cross-sectional view of the speaker according to the first embodiment taken along line III-III of the loudspeaker; [Figure 4] FIG. 2 is an exploded perspective view showing a frame, a magnetic circuit, a damper support member, and a pressing portion of the speaker according to the first embodiment; [Diagram 5] FIG. 3 is a partial cross-sectional view corresponding to FIG. 2 showing a speaker according to a second embodiment of the present invention; [Figure 6] FIG. 4 is a partial cross-sectional view corresponding to FIG. 3 showing a speaker according to a second embodiment of the present invention; [Figure 7] FIG. 11 is an exploded perspective view showing a frame, a magnetic circuit, a damper support member, and a pressing portion of the speaker according to the second embodiment; [Figure 8] FIG. 11 is a half cross-sectional view of a speaker according to a third embodiment of the present invention taken along a cutting plane including a central axis; [Figure 9] FIG. 13 is a perspective view showing a vibrating body support member integrated with a pressing portion in the speaker of the third embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] In the speaker 1 of the first embodiment of the present invention shown in Figures 1 to 3, the Z1-Z2 direction is the front-rear direction, with the Z1 direction being the front and the Z2 direction being the rear. The speaker 1 is sometimes used with the Z1 direction as the sound output direction, and sometimes with the Z2 direction as the sound output direction. Figure 1 shows a central axis O extending in the front-rear direction (Z1-Z2 direction). The main part of the speaker 1 has a structure that is almost rotationally symmetrical about the central axis O. Figure 1 also shows an X-axis and a Y-axis that are perpendicular to each other on a plane perpendicular to the central axis O. The XY plane is a plane perpendicular to the central axis O.

[0020] As shown in Fig. 1 and Fig. 4, the support structure of the speaker 1 is composed of a frame 10 and a damper support member 20. The frame 10 and the damper support member 20 are formed of a magnetic metal or a non-magnetic metal, or are formed of a synthetic resin material. As shown in Fig. 4, the frame 10 is integrally formed with a magnetic circuit holding part 11 located at the rear (Z2 direction), a vibrating body support part 12 located at the front (Z1 direction), and a connecting rib 13 connecting the magnetic circuit holding part 11 and the vibrating body support part 12. The speaker 1 of the embodiment is for vehicle mounting, and the outside of the magnetic circuit holding part 11 of the frame 10 is covered with an exterior case (cosmetic case) 3 as shown in Fig. 1.

[0021] The magnetic circuit holding portion 11 of the frame 10 is formed with a holding recess 11a recessed toward the rear (Z2 direction), and the magnetic circuit 30 is held in a state of being inserted toward the rear in the holding recess 11a. As shown in FIG. 1, the magnetic circuit 30 has an outer circumferential structure located outside the bobbin 53 and an inner circumferential structure located inside. The outer circumferential structure is made up of a ring-shaped magnet 31, a ring-shaped outer circumferential front yoke 32a joined to the front of the magnet 31, and a ring-shaped outer circumferential rear yoke 33a joined to the rear of the magnet 31, which are stacked together. The inner circumferential structure of the magnetic circuit 30 is made up of an inner circumferential front yoke 32b located at the front and an inner circumferential rear yoke 33b located at the rear, which are stacked together. Each of the yokes 32a, 32b, 33a, and 33b is made of a magnetic metal material.

[0022] In the magnetic circuit 30, a front magnetic gap G1 is formed at the opposing portion between the inner peripheral surface of the outer peripheral front yoke 32a and the outer peripheral surface of the inner peripheral front yoke 32b, and a rear magnetic gap G2 is formed at the opposing portion between the inner peripheral surface of the outer peripheral rear yoke 33a and the outer peripheral surface of the inner peripheral rear yoke 33b.

[0023] As shown in Fig. 1, a phase plug 4 is provided in the center of the speaker 1. The phase plug 4 is made of a light metal material or a synthetic resin material, and its outer circumferential surface has a tapered shape in which the diameter dimension gradually decreases toward the front (Z1 direction). A rear end face 4a of the phase plug 4 facing rearward (Z2 direction) is flat, and a female screw hole 4b is formed in the center of the rear end face 4a facing forward. A front end face 32c of the inner circumferential front yoke 32b of the magnetic circuit 30 is also flat, and the rear end face 4a of the phase plug 4 is overlapped with the front end face 32c of the inner circumferential front yoke 32b.

[0024] A fixing hole is formed in the rear end 14 of the frame 10. The inner circumferential rear yoke 33b and the inner circumferential front yoke 32b constituting the inner circumferential structural part of the magnetic circuit 30 are inserted rearward into the holding recess 11a of the magnetic circuit holding part 11. The shank of the fixing screw 5 inserted from the rear into the fixing hole of the rear end 14 is inserted into the central hole of the inner circumferential rear yoke 33b and the central hole of the inner circumferential front yoke 32b, and the male threaded part formed at the tip of the shank of the fixing screw 5 is screwed into the female threaded hole 4b formed in the phase plug 4. By screwing the fixing screw 5 inserted along the central axis O into the phase plug 4, the inner circumferential rear yoke 33b, the inner circumferential front yoke 32b, and the phase plug 4 are positioned relative to each other and firmly fixed.

[0025] In the outer circumferential structural portion of the magnetic circuit 30, the magnet 31, the outer circumferential front yoke 32a, and the outer circumferential rear yoke 33a are positioned relative to one another so that their centers are aligned, and are fixed to one another by the magnetic attraction force of the magnet 31, and are further fixed to one another with an adhesive. After the outer circumferential structural portion is inserted rearward into the holding recess 11a of the magnetic circuit holding portion 11, the rear end face 33c of the outer circumferential rear yoke 33a, which is the rear end face of the outer circumferential structural portion, is fixed to the front face of the rear end portion 14 of the frame 10 with an adhesive. In the installation work of the magnetic circuit 30, a jig is used to position and fix the inner circumferential structural portion and the outer circumferential structural portion of the magnetic circuit 30 so that their centers both match the central axis O.

[0026] As shown in Figs. 1 to 4, the damper support member 20 has a damper fixing surface 22 formed on the inner periphery of a ring-shaped main body 21, which is recessed toward the rear (Z2 direction). The damper fixing surface 22 is a plane parallel to the XY plane. Fixing legs 23 are integrally formed from the ring-shaped main body 21 toward the rear (Z2 direction). The fixing legs 23 are provided at five locations at equal angular intervals in the circumferential direction. A fixing hole 23a is formed in each of the fixing legs 23.

[0027] 1 to 4, in the magnetic circuit holding portion 11 of the frame 10, a mounting surface 15 is formed around the open end of the holding recess 11a. The mounting surface 15 is provided in a ring-shaped area centered on the central axis O, and is a plane parallel to the XY plane. Female threaded holes 16 are formed in the mounting surface 15. The female threaded holes 16 are formed in five locations at equal angular intervals around the central axis O.

[0028] The speaker 1 shown in Figures 1 to 4 is provided with a pressing portion 40. The pressing portion 40 is a pressing member provided separately from the frame 10 and the damper support member 20. The pressing portion (pressing member) 40 is formed of an elastically deformable plate material such as a metal plate or a synthetic resin plate. As shown in Figures 1 to 3, the pressing portion 40 is sandwiched and fixed between the mounting surface 15, which is the front end surface of the magnetic circuit holding portion 11, and the rear surface 23b of the fixing leg portion 23 of the damper support member 20.

[0029] 4, the pressing part 40 has a ring-shaped main body 41, pressing pieces 42, and fixing holes 43 formed in the ring-shaped main body 41. The fixing holes 43 are formed in five locations at equal angular intervals around the central axis O, and the pressing pieces 42 are also formed in five locations at equal angular intervals around the central axis O. The ring-shaped main body 41 is formed with a radius that allows it to be installed on the mounting surface 15 of the magnetic circuit holder 11, and the fixing holes 43 are formed at positions corresponding to the female threaded holes 16 formed in the mounting surface 15.

[0030] The pressing piece 42 is formed to protrude from the ring-shaped main body 41 toward the central axis O. The pressing piece 42 is tapered and has a substantially triangular shape with a width dimension gradually decreasing toward the tip 42a. The pressing portion 40 is formed with a void 44, which is a recess recessed from the outer periphery toward the inside of the pressing piece 42. By providing this void 44, the effective width dimension of the pressing piece 42 is reduced. It is also possible to open a hole in the center of the tapered (substantially triangular) pressing piece 42, and use this hole as the void 44. The pressing piece 42 is tapered toward the tip 42a, and further, the void 44 is formed, so that the elastic modulus due to bending deformation in the plate thickness direction is adjusted to be relatively low.

[0031] 1 and 3, with the pressing portion 40 sandwiched between the mounting surface 15 of the magnetic circuit holding portion 11 and the rear surface 23b of the fixing leg portion 23, five fixing screws 17 are inserted rearward into the fixing holes 23a formed in the fixing leg portion 23 and the fixing holes 43 formed in the pressing portion 40, and are screwed into the female threaded holes 16 formed in the mounting surface 15. The ring-shaped main body portion 41 is firmly fixed onto the mounting surface 15 by the tightening force of the fixing screws 17. The fixing holes 23a and 43, as well as the fixing screws 17 and the female threaded holes 16, form a screw fastening portion that fixes the pressing portion 40 to the magnetic circuit holding portion 11.

[0032] 1 and 2, a ring-shaped restricting surface 32d facing forward is provided on the outer peripheral front yoke 32a of the magnetic circuit 30. The restricting surface 32d is a restricting surface of the outer peripheral structure of the magnetic circuit 30, and is a plane parallel to the XY plane perpendicular to the central axis O. A pressing piece 42 extending from a pressing portion 40 fixed to the mounting surface 15 toward the central axis O abuts against the restricting surface 32d of the magnetic circuit 30.

[0033] 2, the restricting surface 32d is located slightly forward (Z1 direction) of the mounting surface 15, and a step is provided between the restricting surface 32d and the mounting surface 15. Since the pressing piece 42 abuts against the restricting surface 32d in a state where it is bent forward (Z1 direction), the outer peripheral structure of the magnetic circuit 30 is elastically pressed backward (Z2 direction) by the elastic force of the pressing piece 42. When the restricting surface 32d and the mounting surface 15 are at the same position in the front-to-rear direction, or when the restricting surface 32d is set back further rearward than the mounting surface 15, the pressing piece 42 can be bent backward in a free state to allow the pressing piece 42 to elastically press the restricting surface 32d backward.

[0034] 3, in the region where the pressing piece 42 is not provided, the ring-shaped main body 41 of the pressing portion 40 is spaced from the restricting surface 32d toward the outer periphery, and the contact portions between the pressing piece 42 and the restricting surface 32d are positioned with a gap in the circumferential direction centered on the central axis O. The pressing member 40 does not elastically press the restricting surface 32d over the entire circumference in the circumferential direction, but the elastic pressing is limited to the pressing piece 42, so that the stress for elastic pressing acts in a dispersed manner on the multiple pressing pieces 42, and the stress does not act excessively on the entire pressing portion 40.

[0035] In addition, the screw fastening portion including the fixing hole 43 is located on a radial line R1 extending from the central axis O, the pressing piece 42 is located on a radial line R2, and the screw fastening portion and the pressing piece 42 are not located on the same radial line. Therefore, stress due to elastic deformation of the pressing piece 42 is unlikely to act on the screw fastening portion, and it is possible to suppress a large stress acting on the frame 10 due to the elastic deformation of the pressing piece 42. In particular, since the center in the width direction of the pressing piece 42 is located on the radial line R2 that bisects the opening angle of the fixing holes 43 adjacent in the circumferential direction, and the screw fastening portion and the pressing piece 42 are located at equal intervals in the circumferential direction, the stress due to the elastic deformation of the pressing piece 42 does not act unevenly on any one of the screw fastening portions, and this also makes it difficult for the stress due to the deformation of the pressing piece 42 to act on the frame 10.

[0036] Furthermore, in the speaker 1 of the first embodiment, the pressing portion 40 and the damper support member 20 that fixes this pressing portion 40 are provided separately from the frame 10, so that the stress due to the elastic deformation of the pressing piece 42 is less likely to act directly on the frame 10.

[0037] As shown in FIG. 1, a vibrating body 51 is provided in the center of the speaker 1. The vibrating body 51 is cone-shaped. An elastically deformable edge member 52 is joined to the outer periphery of the vibrating body 51 facing forward, and the outer periphery of the edge member 52 is joined to the front edge of the frame 10. A bobbin 53 is joined to the center of the vibrating body 51. Voice coils 54 are provided at two locations in the rear part of the bobbin 53. The voice coils 54 are formed by winding a conductor around the outer periphery of the cylindrical bobbin 53. One voice coil 54 is located in the front magnetic gap G1 of the magnetic circuit 30, and the other voice coil 54 is located in the rear magnetic gap G2. The inner periphery of a damper 55 having a corrugated cross section is joined to the outer periphery of the bobbin 53. The outer periphery of the damper 55 is joined to the damper fixing surface 22 of the damper support member 20.

[0038] 1 to 4, a driving current is applied to two voice coils 54 based on an audio signal output from an audio amplifier. The magnetic flux that crosses the voice coil 54 in the front magnetic gap G1 and the rear magnetic gap G2 of the magnetic circuit 30 and the electromagnetic force excited by the driving current cause the vibrating part including the vibrating body 51 and the voice coil 54 to vibrate in the front-rear direction, generating a sound pressure according to the frequency of the driving current, and sound is emitted forward (Z1 direction) or backward (Z2 direction).

[0039] As shown in Fig. 1, the inner circumferential structure having the inner circumferential front yoke 32b and the inner circumferential rear yoke 33b constituting the magnetic circuit 30 is firmly fixed inside the magnetic circuit holding part 11 of the frame 10 by screwing the fixing screw 5 into the phase plug 4. On the other hand, the outer circumferential structure in which the magnet 31 and the outer circumferential front yoke 32a and the outer circumferential rear yoke 33a are overlapped is bonded inside the magnetic circuit holding part 11. Therefore, there is a risk that the outer circumferential structure may move due to external vibrations, etc. However, in the speaker 1 of the embodiment, as shown in Fig. 2, the outer circumferential structure is elastically pressed backward by the pressing piece 42 of the pressing part 40 provided on the magnetic circuit holding part 11, so that the outer circumferential structure can be prevented from moving inadvertently.

[0040] 2 and 3, the contact portions between the pressing pieces 42 and the restricting surfaces 32d of the outer peripheral structure are spaced apart in the circumferential direction, so that almost only the pressing pieces 42 undergo elastic deformation, preventing a large stress from acting on the frame 10. Therefore, the frame 10 is less likely to be distorted or damaged, and deterioration of the vibration characteristics of the vibrating body 51 caused by distortion of the frame 10 can also be suppressed.

[0041] 5 to 7 show a speaker 101 according to a second embodiment of the present invention. This speaker 101 has a frame 10 and a damper support member 120. The damper support member 120 is formed by integrally molding the damper support member 20 and the pressing portion 40 used in the speaker 1 of the first embodiment. The damper support member 120 is integrally formed as a whole by injection molding using a synthetic resin material or die-cast molding using a metal material. Alternatively, the damper support member 20 and the pressing portion 40, which have been formed separately in advance, may be fixed by a means such as adhesion and used as the damper support member 120.

[0042] As shown in Fig. 6 and Fig. 7, the damper support member 120 is formed by integrating the fixed leg portion 23 and the ring-shaped main body portion 41 of the holding portion 40, and a fixing hole 123a is formed penetrating the fixed leg portion 23 and the ring-shaped main body portion 41. As shown in Fig. 6, the fixing screw 17 is inserted into the fixing hole 123a and screwed into the female threaded hole 16, so that the damper support member 120 is fixed to the mounting surface 15 of the magnetic circuit holding portion 11. The fixing screw 17, the fixing hole 123a, and the female threaded hole 16 form a screw fastening portion. In the holding portion 40, at least the holding piece 42 is configured to be elastically deformable. As shown in Fig. 5, the holding piece 42 is elastically pressed against the restricting surface 32d, which is the front end surface of the magnetic circuit 30, and is supported so that the outer peripheral structure of the magnetic circuit 30 does not easily move.

[0043] In the speaker 201 of the third embodiment of the present invention shown in FIG. 8, the frame 110 is divided into a magnetic circuit holding member 111 and a vibrating body support member 112. However, the frame 110 may be composed of three or more members. The magnetic circuit holding member 111 is a magnetic circuit holding portion, and the magnetic circuit 30 is held in a holding recess 111a formed in the magnetic circuit holding member 111. The inner peripheral structure of the magnetic circuit 30 is composed of the inner peripheral front yoke 32b and the inner peripheral rear yoke 33b, and the inner peripheral structure and the phase plug 4 are fixed in the holding recess 111a by the fixing screw 5, as in the speaker 1 of the first embodiment shown in FIG. 1. However, the fixing screw 5 is omitted in FIG. 8. The outer peripheral structure of the magnetic circuit 30 is composed of the magnet 31, the outer peripheral front yoke 32a, and the outer peripheral rear yoke 33a. In the outer peripheral structure, the rear end surface 33c of the outer peripheral rear yoke 33a is bonded to the bottom surface of the holding recess 111a. A front magnetic gap G1 and a rear magnetic gap G2 are formed between the inner peripheral structure and the outer peripheral structure.

[0044] As shown in FIG. 9, the vibrating body support member 112 of the frame 110 has a pressing part 40 integrally formed at the rear. The vibrating body support member 112 is integrally formed as a whole by injection molding using a synthetic resin material, die casting molding using a metal material, or press molding. The pressing part 40 has a ring-shaped main body part 41, a fixing hole 43 provided in the ring-shaped main body part 41, and a pressing piece 42 protruding from the ring-shaped main body part 41 toward the center. As shown in FIG. 8, the surface of the magnetic circuit holding member 111 facing forward (Z1 direction) is a mounting surface 115, and a female screw hole 116 is formed in this mounting surface 115. As shown in FIG. 8, the fixing screw 17 inserted into the fixing hole 43 is screwed into the female screw hole 116, and the ring-shaped main body part 41 is fixed to the mounting surface 115 of the magnetic circuit holding member 111. The fixing hole 43, the female screw hole 116, and the fixing screw 17 form a screw-fastening part. The magnetic circuit holding member 111 and the vibrating body support member 112 are fixed together by this screw fastening portion.

[0045] At least the pressing piece 42 is elastically deformable in the vibrating body support member 112. As shown in Fig. 8, the pressing piece 42 extends from the mounting surface 115 toward the central axis O, and presses against a restricting surface 32d, which is a front end surface of the outer structural portion of the magnetic circuit 30.

[0046] As shown in Fig. 9, an edge member fixing surface 113 is formed on the outer periphery of the front end of the vibrating body support member 112, and a damper fixing surface 114 is formed behind the inner periphery. The outer periphery of the edge member 52 joined to the outer edge of the vibrating body 51 is joined to the edge member fixing surface 113. A bobbin 53 is adhered to the center of the vibrating body 51, and a voice coil 54 is provided at two locations on the rear of the bobbin 53. The voice coil 54 is located inside the front magnetic gap G1 and the rear magnetic gap G2. A damper 55 is joined to the outer periphery of the bobbin 53, and the outer periphery of the damper 55 is joined to the damper fixing surface 114.

[0047] In the speaker 201 of the third embodiment, the pressing portion 40 is integrally formed with the vibrating body support member 112, and therefore, by fixing the magnetic circuit holding member 111 and the vibrating body support member 112 with a screw fastening portion, the pressing portion 40 can be accurately positioned and fixed without the need to position it separately. The pressing piece 42 is located away from the vibrating body support member 112 via a space portion 117, and has a structure that allows it to elastically deform independently. Therefore, even if the pressing piece 42 that presses the outer peripheral structure of the magnetic circuit 30 elastically deforms, the structure is such that stress is not easily transmitted to the vibrating body support member 112. Therefore, the outer peripheral structure of the magnetic circuit 30 can be stably held in the holding recess 111a of the magnetic circuit holding member 111, and excessive stress can be prevented from acting on the vibrating body support member 112.

[0048] In addition, in the speaker 201 of the third embodiment shown in Figures 8 and 9, the pressing portion 40 may be formed separately from the vibrating body support member 112, and the ring-shaped main body portion 41 of the pressing portion 40 may be sandwiched and fixed between the magnetic circuit holding member 111 and the vibrating body support member 112. [Explanation of symbols]

[0049] 1,101,201 Speakers 10 Frames 11 Magnetic circuit holding part 11a Retaining recess 12 Vibrating body support part 15 Mounting surface 16 Female thread hole 17 Fixing screw 20 Damper support member 23 Fixed legs 30 Magnetic Circuit 32d Regulatory aspects 40 Presser section 41 Ring-shaped main body 42 Presser piece 43 Fixing hole 51 Vibration Body 52 Edge material 54 Voice coil 55 Damper 110 Frames 111 Magnetic circuit holding member 111a Retaining recess 112 Vibration body support member 115 Mounting surface 120 Damper support member G1, G2 magnetic gap O center axis

Claims

1. A speaker including a frame, a vibrating body supported by the frame so as to be capable of vibrating freely, a coil that applies a vibrating force to the vibrating body, and a magnetic circuit located behind the vibrating body and applying a magnetic field to the coil, the magnetic circuit is held by a magnetic circuit holding portion provided on the frame, the magnetic circuit holding portion is formed with a mounting surface facing forward, and the magnetic circuit is provided with a restricting surface facing forward, a pressing portion is screwed to the mounting surface, a pressing piece that comes into contact with the regulating surface is formed integrally with the pressing portion, and the pressing piece and the screw fastening portion are arranged so that they are not located on a common radial line extending from a center of the magnetic circuit, A speaker, characterized in that the abutment portions between the pressing piece and the regulating surface are provided at a plurality of locations spaced apart from one another.

2. 2. The speaker according to claim 1, wherein the magnetic circuit is inserted rearward into the magnetic circuit holder and fixed thereto.

3. 3. The speaker according to claim 1, wherein the pressing portion is provided separately from the frame.

4. 3. The speaker according to claim 1, wherein the pressing portion is provided integrally with the frame.

5. a damper support member to which an outer periphery of a damper that supports the vibrating body is fixed is provided separately from the frame, 4. The speaker according to claim 3, wherein the pressing portion is sandwiched between the mounting surface and the damper support member.

6. a damper support member to which an outer periphery of a damper that supports the vibrating body is fixed is provided separately from the frame, 4. The speaker according to claim 3, wherein the pressing portion is formed integrally with the damper support member.

7. the frame has a vibrator support member that supports the vibrator and a magnetic circuit holding member that holds the magnetic circuit, 5. The speaker according to claim 4, wherein the pressing portion is formed integrally with the vibrating body support member.

8. the frame has a vibrator support member that supports the vibrator and a magnetic circuit holding member that holds the magnetic circuit, 4. The speaker according to claim 3, wherein the pressing portion is sandwiched between the mounting surface and the vibrating body support member.

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