JP2006041768A - Electroacoustic transducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electroacoustic transducer which has enhanced anti-shock performance and therefore hardly undergoes a change in an output sound pressure and a distortion factor even when receiving an external shock. <P>SOLUTION: In the electroacoustic transducer wherein a drive section 1 comprising an armature 2, a yoke 3, a coil 4, and a pair of magnets 5, 6 is arranged in a housing 22, an elastic body 30 is provided between an outer side face 11a of a rear plate part 11 of the armature 2 and an inner wall 20c of a case 20 forming the housing 22, even when the electroacoustic transducer receives a transient shock such as a falling shock, the elastic body 30 suppresses a torsion or the like of the back plate part 11 of the armature 2 to thereby prevent a bent part 15 being a connected part between a central plate 14 and the back plate part 11 from being plastically deformed thereby preventing a change in the output sound pressure and the distortion factor due to a positional deviation in the center plate 14 of the armature 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electroacoustic transducer in which a drive unit including an armature, a yoke, a coil, a pair of magnets, and the like is arranged in a housing.

  Conventional electroacoustic transducers used for hearing aids, etc. are arranged inside a side plate of a plate-like member that forms an armature by arranging a drive unit consisting of an armature, a yoke, a coil, a pair of magnets, etc. in a casing consisting of a case and a cover. It is known that the plate-like member forming the armature is fixed to the housing via the yoke by fixing the side surface of the yoke by bonding or the like, and further fixing the lower surface of the yoke and the bottom surface of the case ( For example, see Patent Document 1).

JP 58-99099 A

  However, in the conventional electroacoustic transducer, the armature formed by the plate-like member is fixed to the side surface of the yoke on the inner side of the side plate away from the center plate by welding or bonding. For example, the hearing aid is dropped. When an external impact is received, as in the case of stagnation, plastic deformation occurs in a part of the plate-like member due to excessive vibration of the center plate, and the position of the center plate of the armature formed parallel to the side plate is changed. There is a problem that both the output sound pressure and the distortion rate change due to deviation.

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to improve the impact resistance and output sound pressure and distortion even when subjected to an external impact. It is an object of the present invention to provide an electroacoustic transducer in which rate change is unlikely to occur.

  In order to solve the above-mentioned problem, the invention according to claim 1 is an electroacoustic transducer in which a drive unit including an armature, a yoke, a coil, a pair of magnets, and the like is disposed in a casing, between the armature and the inner wall of the casing. An elastic body was provided.

  According to a second aspect of the present invention, there is provided an electroacoustic transducer in which a drive unit including an armature, a yoke, a coil, a pair of magnets, and the like is disposed in a housing, and the outer surface of the back plate portion of the armature and the inner wall of the housing. An elastic body was provided between them.

  According to a third aspect of the present invention, there is provided an electroacoustic transducer in which a drive unit including an armature, a yoke, a coil, a pair of magnets, and the like is disposed in a housing, and the space between the upper surface of the back plate portion of the armature and the inner wall of the housing. An elastic body was provided.

  According to a fourth aspect of the present invention, there is provided an electroacoustic transducer in which a drive unit including an armature, a yoke, a coil, a pair of magnets, and the like is disposed in a housing, and between the lower surface of the back plate portion of the armature and the lead of the coil. An elastic body was provided.

  The invention according to claim 5 is an electroacoustic transducer in which a drive unit including an armature, a yoke, a coil, a pair of magnets, and the like is disposed in a housing, and the armature has an inner wall of the coil on the upper and lower surfaces of the center plate. It is bridged by an elastic body.

  The invention according to claim 6 is an electroacoustic transducer in which a drive unit including an armature, a yoke, a coil, a pair of magnets, and the like is arranged in a casing, and both the inner and outer surfaces of both side plates of the armature and the coil. An elastic body was provided between the outer wall of the case or the inner wall of the case.

  As described above, according to the first aspect of the present invention, even when a transitional impact such as a drop impact is applied, the elastic body suppresses displacement such as torsion of the armature so that plastic deformation hardly occurs. Thus, it is possible to prevent the output sound pressure and the distortion rate from being changed due to the position shift of the armature.

According to the invention of claim 2, even when a transitional impact such as a drop impact is received, the elastic body suppresses twisting of the back plate portion of the armature and the connection portion between the center plate and the back plate portion Since the (bending portion) is less likely to cause plastic deformation, it is possible to prevent the output sound pressure and the distortion rate from being changed due to the armature position shift.

  According to the invention of claim 3, even when a transitional impact such as a drop impact is received, the elastic body suppresses displacement in the upper surface direction of the back plate portion of the armature, and the center plate and the back plate portion Since the connecting portion (bending portion) is less likely to be plastically deformed, it is possible to prevent the output sound pressure and the distortion rate from being changed due to the position shift of the armature.

  According to the invention of claim 4, even when a transitional impact such as a drop impact is received, the elastic body suppresses the displacement of the armature back plate in the lower surface direction, and the center plate and the back plate Since the connecting portion (bending portion) is less likely to be plastically deformed, it is possible to prevent the output sound pressure and the distortion rate from being changed due to the position shift of the armature.

  According to the invention of claim 5, even when a transitional impact such as a drop impact is received, the elastic body suppresses the displacement of the central plate of the armature, and the connecting portion (bending of the central plate and the back plate portion) Therefore, it is possible to prevent the output sound pressure and the distortion rate from being changed due to the armature misalignment.

According to the invention according to claim 6, even when a transient impact such as a drop impact is received, the elastic body suppresses the deflection of the side plate portion and the displacement, thereby suppressing the displacement of the back plate portion, Since the connecting portion (bending portion) between the center plate and the back plate portion is less likely to be plastically deformed, it is possible to prevent the output sound pressure and the distortion rate from being changed due to the armature position shift.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is an exploded perspective view of a drive unit constituting the electroacoustic transducer according to the present invention, and FIGS. 2 to 6 are a part of the first to fifth embodiments of the electroacoustic transducer according to the present invention. A plan view (a), cross-sectional views (b), (c), FIG. 7 and FIG. 8 showing the interior of the other armature are shown in a plan view (a), a cross-sectional view (b), and a rear view (c). ).

  As shown in FIG. 1, the drive unit 1 constituting the electroacoustic transducer according to the present invention includes an armature 2, a yoke 3, a coil 4, a pair of magnets 5 and 6, and a rod 7.

  The armature 2 is a plate-like member obtained by bending a metal plate of a soft magnetic material into a substantially E shape in plan view, and a back plate portion 11 and side plate portions 12 and 13 extending in parallel from both ends of the back plate portion 11. And a central plate 14 extending between the side plate portions 12 and 13 from the central portion of the back plate portion 11.

A bent portion 15 that is bent substantially at a right angle is formed at a connection portion between the center plate 14 and the back plate portion 11. Also, bent portions 16 and 17 that are bent substantially at right angles are formed at the connecting portion between the back plate portion 11 and the side plate portions 12 and 13.

As shown in FIGS. 2 to 5, plate-like magnets 5 and 6 are fixed to the opposing inner walls of the yoke 3, and the yoke 3 and the coil 4 are connected so that the respective through holes 3a and 4a are connected. ing. Further, the central plate 14 is inserted into the through holes 3a, 4a until the tip portion 14a protrudes so that the central plate 14 does not contact the coil 4 and the magnets 5, 6, and the inner side surfaces 12a, 13a of the side plate portions 12, 13 are inserted into the yoke 3. It is being fixed to the outer surface of this by welding or adhesion | attachment.

  The coil 4 is provided with a pair of leads 4b and 4c extending to the back plate portion 11 side of the armature 2. Further, one end 7 a of the rod 7 is fixed to the front end portion 14 a of the center plate 14 so that the rod 7 is perpendicular to the upper surface 14 b of the center plate 14.

  In the first embodiment of the electroacoustic transducer according to the present invention, as shown in FIG. 2, the drive unit 1 is housed in a housing 22 including a case 20 and a cover 21. The lower surface is fixed to the case 20 by being fixed to the bottom surface of the case 20. The other end 7 b of the rod 7 is inserted and fixed in a through hole opened in the diaphragm 23.

  The diaphragm 23 is bonded to a film 25 stretched on the diaphragm frame 24 and is configured to be interlocked with the movement of the front end portion 14 a of the center plate 14 via the rod 7. The diaphragm frame 24 is sandwiched between the case 20 and the cover 21 and is a part of the housing 22. The pair of leads 4 b and 4 c provided on the coil 4 passes through a through hole formed in the case 20, is bent at its tip, and is fixed to the terminal plate 26. The through-hole formed in the case 20 is closed with an ultraviolet curing adhesive or the like after passing through the leads 4b and 4c.

  Further, an elastic body 30 is provided between the outer surface 11 a of the back plate portion 11 of the armature 2 and the inner wall 20 c of the case 20. The location where the elastic body 30 is provided may be one central portion of the outer surface 11a, two left and right portions of the outer surface 11a, or three or more locations on the outer surface 11a.

  As the elastic body 30, it is best to use an ultraviolet curable resin, but silicon rubber can also be used. When using an ultraviolet curable resin, the ultraviolet curable resin is filled between the outer surface 11a of the back plate 11 and the inner wall 20c of the case 20, and the filled ultraviolet curable resin is irradiated with ultraviolet rays to be cured. An elastic body 30 is formed.

  Note that reference numeral 31 denotes a sound guide, which guides an acoustic signal, which has been subjected to electrical / acoustic conversion by the drive unit 1 and the diaphragm 23 disposed in the housing 22, from the sound port 32 formed in the housing 22. Is.

As described above, when the elastic body 30 is provided between the outer surface 11a of the back plate portion 11 and the inner wall 20c of the case 20, the hearing aid to which the electroacoustic transducer according to the present invention is applied is dropped on the floor or the like. However, the twist of the back plate portion 11 due to the vibration of the center plate 14 due to the drop impact is suppressed, and the angle portion of the bent portion 15 which is a connection portion between the center plate 14 and the back plate portion 11 is prevented from being opened. It becomes difficult to become plastic deformation beyond elastic deformation.

Accordingly, since the bending portion 15 does not reach plastic deformation but remains elastic deformation, even if the hearing aid is dropped, the position of the distal end portion 14a of the central plate 14 is unlikely to occur, and the output sound pressure and distortion rate as an electroacoustic transducer is reduced. Can be prevented from changing.

Next, in the second embodiment of the electroacoustic transducer according to the present invention, an elastic body 30 is provided between the upper surface 11b of the back plate portion 11 of the armature 2 and the inner wall 20c of the case 20, as shown in FIG. Is provided. The elastic body 30 may be provided at one central portion of the upper surface 11b, at two left and right positions on the upper surface 11b, or at three or more locations on the upper surface 11b. Other configurations are the same as those of the first embodiment shown in FIG.

Thus, even when the hearing aid to which the electroacoustic transducer according to the present invention is applied is dropped on the floor or the like by providing the elastic body 30 between the upper surface 11b of the back plate portion 11 and the inner wall 20c of the case 20. In addition, the displacement of the back plate portion 11 to the inner wall 20c side due to the drop impact is suppressed, the opening of the bent portion 15 which is a connection portion between the center plate 14 and the back plate portion 11 is suppressed, and the bent portion 15 is elastic. It becomes difficult to become plastic deformation beyond deformation.

  Accordingly, since the bending portion 15 does not reach plastic deformation but remains elastic deformation, even if the hearing aid is dropped, the position of the distal end portion 14a of the central plate 14 is unlikely to occur, and the output sound pressure and distortion rate as an electroacoustic transducer is reduced. Can be prevented from changing.

  Next, in the third embodiment of the electroacoustic transducer according to the present invention, as shown in FIG. 4, between the lower surface 11c of the back plate portion 11 of the armature 2 and the upper surfaces of the leads 4b and 4c of the coil 4. The elastic body 30 is provided. Other configurations are the same as those of the first embodiment shown in FIG.

  As described above, by providing the elastic body 30 between the lower surface 11c of the back plate 11 and the upper surfaces of the leads 4b and 4c of the coil 4, the hearing aid to which the electroacoustic transducer according to the present invention is applied is dropped on the floor or the like. Even if it is made to move, the displacement of the back plate portion 11 to the leads 4b and 4c side due to the drop impact is suppressed, and the opening of the bent portion 15 which is the connection portion between the center plate 14 and the back plate portion 11 is suppressed. The bent portion 15 is less likely to be plastically deformed beyond elastic deformation.

  Accordingly, since the bending portion 15 does not reach plastic deformation but remains elastic deformation, even if the hearing aid is dropped, the position of the distal end portion 14a of the central plate 14 is unlikely to occur, and the output sound pressure and distortion rate as an electroacoustic transducer is reduced. Can be prevented from changing.

  Next, as shown in FIG. 5, the electroacoustic transducer according to the fourth embodiment of the present invention is between the upper and lower surfaces 14 b and 14 c on the back plate portion 11 side of the center plate 14 and the inner wall 4 d of the coil 4. The elastic body 30 is provided so as to be bridged. The location where the elastic body 30 is provided may be one, two, or three or more central portions of the upper and lower surfaces 14b and 14c. The elastic body 30 may be provided between one of the upper and lower surfaces 14b and 14c and the inner wall 4d of the coil 4. Other configurations are the same as those of the first embodiment shown in FIG.

  Thus, by providing the elastic body 30 between the upper and lower surfaces 14b and 14c on the back plate portion 11 side of the center plate 14 and the inner wall 4d of the coil 4, a hearing aid to which the electroacoustic transducer according to the present invention is applied. Even when dropped on the floor or the like, the displacement of the front end portion 14a of the center plate 14 due to the drop impact is suppressed, and the opening of the bent portion 15 that is the connection portion between the center plate 14 and the back plate portion 11 is suppressed. The bent portion 15 is less likely to be plastically deformed beyond elastic deformation.

  Accordingly, since the bending portion 15 does not reach plastic deformation but remains elastic deformation, even if the hearing aid is dropped, the position of the distal end portion 14a of the central plate 14 is unlikely to occur, and the output sound pressure and distortion rate as an electroacoustic transducer is reduced. Can be prevented from changing.

Next, in the fifth embodiment of the electroacoustic transducer according to the present invention, as shown in FIG. 6, between the inner surfaces 12 a and 13 a of the side plate portions 12 and 13 of the armature 2 and the side surfaces of the coil 4, An elastic body 30 is provided between the outer surfaces 12 b and 13 b of the two side plate portions 12 and 13 and the inner wall of the case 20. The elastic body 30 may be provided between any one of the inner and outer surfaces 12a, 12b, 13a, 13b and the side surface of the coil 4 or the inner wall of the case 20. Other configurations are the same as those of the first embodiment shown in FIG.

Thus, the elastic body 30 is formed between the inner surfaces 12a and 13a of the side plate portions 12 and 13 of the armature 2 and the side surface of the coil 4, and the outer surfaces 12b and 13b of the side plate portions 12 and 13 of the armature 2 and the inner wall of the case 20. Even when the hearing aid to which the electroacoustic transducer according to the present invention is applied is dropped on the floor or the like, the displacement of the front end portion 14a of the central plate 14 due to the drop impact is suppressed by providing the elastic body 30 between The opening of the angle of the bending part 15 which is a connection part of the center board 14 and the back board part 11 is suppressed, and the bending part 15 becomes difficult to become plastic deformation exceeding elastic deformation.

Accordingly, since the bending portion 15 does not reach plastic deformation but remains elastic deformation, even if the hearing aid is dropped, the position of the distal end portion 14a of the central plate 14 is unlikely to occur, and the output sound pressure and distortion rate as an electroacoustic transducer is reduced. Can be prevented from changing.

Moreover, not only the armature 2 shown in FIG. 1 but the armature 40 shown in FIG. 7 and the armature 50 shown in FIG. 8 can be used.
As shown in FIG. 7, the armature 40 is a plate-like member obtained by bending a metal plate of a soft magnetic material into a substantially E shape in plan view, and is parallel to the back plate portion 41 and both ends of the back plate portion 41. It consists of extended side plate portions 42 and 43 and a center plate 44 extending between the side plate portions 42 and 43 from the center portion of the back plate portion 41.

In the case of the armature 40, between the outer surface 41a of the back plate portion 41 and the inner wall 20c of the case 20, between the lower surface 41c of the back plate portion 41 and the upper surfaces of the leads 4b and 4c of the coil 4, Between the upper and lower surfaces 44b, 44c near the back plate 41 and the inner wall 4d of the coil 4, between the inner surfaces 42a, 43a of the side plates 42, 43 and the side surfaces of the coil 4, and the outer surfaces 42b, 43b of the side plates 42, 43. An elastic body 30 can be provided between the inner wall of the case 20.

  If the elastic body 30 is provided in such a place, even when the hearing aid to which the electroacoustic transducer according to the present invention is applied is dropped on the floor or the like, the displacement of the front end portion 44a of the central plate 44 due to the drop impact is suppressed. And the connection part 45 of the center board 44 and the back board part 41 exceeds elastic deformation, and becomes difficult to become plastic deformation.

  Accordingly, since the connecting portion 45 does not reach the plastic deformation and remains in the elastic deformation, even if the hearing aid is dropped, the position shift of the front end portion 44a of the central plate 44 hardly occurs, and the output sound pressure and distortion rate as the electroacoustic transducer are reduced. Can be prevented from changing.

  As shown in FIG. 8, the armature 50 is a plate-like member obtained by bending a metal plate of a soft magnetic material into a substantially E shape in plan view, and is parallel to the back plate portion 51 and both ends of the back plate portion 51. The center plate 54 extends between the side plate portions 52 and 53 via the side plate portions 52 and 53 extending from the center portion of the back plate portion 51 and the bent portion 55 bent in a substantially U shape.

  In the case of the armature 50, between the bent portion 55 and the inner wall 20c of the case 20, between the lower portion 55c of the bent portion 55 and the upper surfaces of the leads 4b and 4c of the coil 4, and above and below the bent portion 55 of the central plate 44. Between the both surfaces 54b and 54c and the inner wall 4d of the coil 4, between the inner surfaces 52a and 53a of the side plate portions 52 and 53 and the side surface of the coil 4, and between the outer surfaces 52b and 53b of the side plate portions 52 and 53 and the inner wall of the case 20. An elastic body 30 can be provided therebetween.

  If the elastic body 30 is provided in such a place, even when the hearing aid to which the electroacoustic transducer according to the present invention is applied is dropped on the floor or the like, the displacement of the front end portion 54a of the central plate 54 due to the drop impact is suppressed. In addition, the bent portion 55, which is a connection portion between the center plate 54 and the back plate portion 51, is less likely to be plastically deformed beyond elastic deformation.

  Therefore, the bent portion 55 does not reach plastic deformation but remains elastically deformed, so that even if the hearing aid is dropped, the position of the front end portion 54a of the center plate 54 hardly occurs, and the output sound pressure and distortion rate as an electroacoustic transducer are reduced. Can be prevented from changing.

  Improve impact resistance and provide electroacoustic transducers that do not easily change the output sound pressure and distortion rate even when subjected to external impacts. Will contribute to the expansion of demand for hearing aids.

The disassembled perspective view of the drive part which comprises the electroacoustic transducer which concerns on this invention BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a first embodiment of an electroacoustic transducer according to the present invention, in which (a) is a plan view showing the inside with a part cut away, and (b) and (c) are both sectional views. FIG. 2 shows a second embodiment of the electroacoustic transducer according to the present invention, in which (a) is a plan view showing the inside with a part cut away, and (b) and (c) are both sectional views. FIG. 3 shows a third embodiment of an electroacoustic transducer according to the present invention, in which (a) is a plan view showing the inside with a part cut away, and (b) and (c) are both sectional views. 4A and 4B show a fourth embodiment of an electroacoustic transducer according to the present invention, in which FIG. 4A is a plan view showing the inside with a part cut away, and FIGS. FIG. 5 shows a fifth embodiment of an electroacoustic transducer according to the present invention, in which (a) is a plan view showing the inside with a part cut away, and (b) and (c) are both sectional views. The other armature structure is shown, (a) is a plan view, (b) is a cross-sectional view, and (c) is a rear view. The other armature structure is shown, (a) is a plan view, (b) is a cross-sectional view, and (c) is a rear view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Drive part, 2 ... Armature, 3 ... Yoke, 4 ... Coil, 4b, 4c ... Lead | Lead, 4d ... Inner wall, 5, 6 ... Magnet, 7 ... Rod, 11 ... Back board part, 11a ... Outer surface, 11b ... Upper surface, 11c ... lower surface, 12, 13 ... side plate portion, 12a, 13a ... inner surface, 12b, 13b ... outer surface, 14 ... central plate, 14a ... tip portion, 14b ... upper surface of central plate, 14c ... lower surface of central plate, 15 ... bending Part, 20 ... case, 20c ... inner wall, 21 ... cover, 22 ... housing, 30 ... elastic body.

Claims (6)

An electroacoustic transducer in which a driving unit including an armature, a yoke, a coil, a pair of magnets, and the like is disposed in a housing, and an electroacoustic transducer is provided between the armature and the inner wall of the housing vessel. In an electroacoustic transducer in which a drive unit composed of an armature, a yoke, a coil, a pair of magnets, etc. is arranged in a housing, an elastic body is provided between the outer surface of the back plate portion of the armature and the inner wall of the housing. An electroacoustic transducer characterized by. In an electroacoustic transducer in which a drive unit including an armature, a yoke, a coil, a pair of magnets, and the like is arranged in a housing, an elastic body is provided between the upper surface of the back plate portion of the armature and the inner wall of the housing. A featured electroacoustic transducer. In an electroacoustic transducer in which a drive unit including an armature, a yoke, a coil, a pair of magnets, and the like is disposed in a housing, an elastic body is provided between the lower surface of the back plate portion of the armature and the lead of the coil. Electroacoustic transducer. In an electroacoustic transducer in which a drive unit composed of an armature, a yoke, a coil, a pair of magnets, etc. is arranged in a housing, the upper and lower surfaces or either one of the central plate of the armature are bridged by the inner wall of the coil and an elastic body. An electroacoustic transducer characterized by that. In an electroacoustic transducer in which a drive unit composed of an armature, a yoke, a coil, a pair of magnets, etc. is arranged in a housing, both the inner and outer surfaces of both side plates of the armature and the outer wall of the coil or the inner wall of the case An electroacoustic transducer, wherein an elastic body is provided between the two.