JP2013145994A - Electrodynamic speaker and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrodynamic speaker which reduces man hours in the manufacturing processes even when a damper is provided at the cylindrical inner side of a voice coil bobbin in a speaker, and to provide a manufacturing method of the electrodynamic speaker.SOLUTION: An electrodynamic speaker includes: a diaphragm formed by injection molding a resin material; a voice coil connected with the diaphragm; a magnetic circuit having a magnetic gap into which the voice coil is inserted; and a damper disposed in a space defined by the voice coil, the damper where the inner peripheral side connects with the center side of the diaphragm and the outer peripheral side is fastened to the magnetic circuit. The diaphragm includes: a thin diaphragm part; and a protruding part extending at the center side of the diaphragm part in a direction that the magnetic circuit is positioned. The damper includes: an inner periphery fixing part connected with the protruding part of the diaphragm; an outer periphery fixing part connected with the magnetic circuit; and a support movable part connecting the inner periphery fixing part with the outer peripheral fixing part so that the inner periphery fixing part and the outer peripheral fixing part can move.

Description

  The present invention is a small electrodynamic speaker excellent in sound reproduction capability, and an electrodynamic speaker capable of reducing the number of manufacturing steps even if the damper is provided with a damper inside the cylinder of the voice coil bobbin, and its It relates to a manufacturing method.

  In an audio device such as a display to which a speaker for reproducing sound is attached, it is desired to reduce the space required for attaching the speaker. In particular, a small-sized or slender (rectangular, oval (including elliptical, track-shaped) electrodynamic speaker) is a speaker in which a tinsel wire (or lead wire) that supplies a voice signal current to a voice coil is arranged. Since the space on the back side of the diaphragm is narrowed, there is a problem that the tinsel wire is in contact with the diaphragm or the frame and noise is likely to occur. Small electrodynamic speakers have disadvantages for various reasons, such as providing an edge or damper that supports the vibration system including the speaker diaphragm, because the tinsel wires are more likely to come into contact and cannot be miniaturized. Therefore, conventionally, in order to solve these problems, there is a speaker in which a damper is provided inside the cylinder of the voice coil bobbin without providing the damper outside the cylinder of the voice coil bobbin.

  For example, in the related art, a speaker including a dome diaphragm, a voice coil bobbin, a damper, and a magnetic circuit, and the dome diaphragm extends from the outer peripheral end of the dome portion along the cylindrical inner surface of the voice coil bobbin. The damper has a first fixing portion and a second fixing portion extending substantially at right angles from the outer peripheral end of the first fixing portion, and the damper is disposed inside the space defined by the voice coil bobbin, and the inner peripheral end of the damper. However, there is a speaker that is fixed to the magnetic circuit and the outer peripheral end of the damper is joined to the outer peripheral end of the dome portion and the cylindrical inner surface of the voice coil bobbin. (Patent Document 1).

  In addition, a bobbin around which the voice coil is wound, a damper that is disposed inside the space defined by the bobbin and whose outer peripheral side is fixed to the cylindrical inner surface of the bobbin, and a damper fixing portion that fixes the inner peripheral side of the damper A speaker assembly comprising a damper base and a magnetic circuit having a magnetic gap in which a voice coil is disposed and fixing the damper base. The damper base and the magnetic circuit temporarily fix the damper fixing portion of the damper base. The vibration system positioning mechanism is configured to move between the position and the main fixing position, and the bobbin protrudes from the inner surface of the cylinder toward the inner diameter side, and the engagement protrusion is set so that the inner diameter is substantially equal to the inner diameter of the magnetic gap. The engagement protrusion is approximately the distance that the separation between the engagement protrusion and the center position of the voice coil is such that the damper fixing portion of the damper base moves between the temporary fixing position and the main fixing position. The damper fixing part is set to a position where the damper is fixed, and the damper fixing part protrudes through the central hole formed in the top plate of the magnetic circuit, and the damper fixing part comes into contact with the magnetic circuit and is temporarily fixed or permanently fixed. And a speaker using the speaker assembly. (Patent Document 2).

  In addition, a bobbin around which the voice coil is wound, a diaphragm fixed to the bobbin, a damper disposed inside a space defined by the bobbin and having an outer peripheral side fixed to the cylindrical inner surface of the bobbin, and a voice coil A magnetic circuit having a magnetic gap and a magnetic circuit for fixing the inner peripheral side of the damper, and a frame fixed to the outer peripheral side of the diaphragm and the magnetic circuit, wherein the diaphragm, the damper, and the bobbin are: The upper space of the damper is defined, the magnetic circuit, the damper, and the bobbin define the lower space of the damper, and the bobbin is defined as a notch extending from the middle portion to the lower end thereof in the circumferential direction, etc. The damper has a plurality of damper notches that are defined as notches extending from the middle portion to the outer peripheral end at equal intervals in the circumferential direction, and the damper notches are located at the middle portion of the bobbin. And a first cutout portion formed in an arc shape in the circumferential direction, and a second cutout portion formed so as to connect the first cutout portion and the bobbin cutout portion of the bobbin in the radial direction. There is a speaker that connects a space and a damper lower space to each other (Patent Document 3).

JP 2004-221691 A (FIG. 1) JP 2008-271341 A (FIGS. 1 to 6) JP 2008-271342 A (FIGS. 1 to 5)

  However, a speaker having a damper inside the cylinder of the voice coil bobbin has a problem that it is difficult to arrange the voice coil at a predetermined position in the magnetic gap of the magnetic circuit in the manufacturing process. For example, in a speaker provided with an inner damper of Patent Document 1, a step of fixing an outer peripheral edge to a bobbin in advance, a step of removing a voice coil holder inserted on the inner peripheral side of the bobbin, and an inner damper thereafter. A step of fixing to the magnetic circuit and the bobbin and a step of fixing the dome diaphragm to the upper end of the bobbin cylinder are required. In the case of Patent Document 2, a vibration system positioning mechanism for the speaker assembly is required, and the speaker of Patent Document 3 requires a predetermined voice coil holder, which requires a large number of manufacturing steps and is expensive. There is a problem of becoming an electrodynamic speaker.

  The present invention has been made in order to solve the above-described problems of the prior art, and an object of the present invention is to enable a reduction in the number of manufacturing steps even for a speaker in which a damper is provided inside a cylinder of a voice coil bobbin. An object is to provide an electric speaker and a manufacturing method thereof.

  The electrodynamic speaker of the present invention is defined by a diaphragm formed by injection molding of a resin material, a voice coil connected to the diaphragm, a magnetic circuit having a magnetic gap into which the voice coil is inserted, and a voice coil. A damper that is arranged inside the space and whose inner peripheral side is connected to the center side of the diaphragm and whose outer peripheral side is fixed to the magnetic circuit, the diaphragm is a thin-walled diaphragm part, and the center of the diaphragm part A protrusion extending in the direction in which the magnetic circuit is positioned on the side, and an inner periphery fixing portion where the damper is connected to the protrusion of the diaphragm, an outer periphery fixing portion connecting to the magnetic circuit, and an inner periphery fixing And a support movable part that couples the part and the outer peripheral fixed part so as to vibrate.

  The electrodynamic speaker of the present invention further includes a frame having a substantially basket-like base and connected to the magnetic circuit to accommodate the diaphragm, and an outer peripheral end of the diaphragm and an edge connected to the frame, An edge includes an inner peripheral fixed portion that is connected to the outer peripheral end of the diaphragm, an outer peripheral fixed portion that is fixed to the frame, and a support movable portion that connects the inner peripheral fixed portion and the outer peripheral fixed portion so as to vibrate, The diaphragm and the edge are integrally formed, and at least the support movable part of the diaphragm and the edge are made of different materials.

  Preferably, in the electrodynamic loudspeaker of the present invention, the magnetic circuit includes a top plate or a pole piece that forms a magnetic gap and connects the outer periphery fixing portion of the damper.

  Preferably, in the electrodynamic speaker of the present invention, the magnetic circuit has a central through hole communicating with the space defined by the voice coil from the back side at the center and a plurality of through holes communicating with the magnetic gap from the back side. And including.

  A method for manufacturing an electrodynamic speaker according to the present invention is the above-described method for manufacturing an electrodynamic speaker, comprising a step of forming a magnetic circuit and a plurality of engaging portions at predetermined positions of a plate-like substrate. Placing the magnetic circuit on the jig, inserting the engaging portion into the central through hole and the plurality of through holes of the magnetic circuit from the back side of the magnetic circuit, and connecting the outer periphery fixing portion of the damper to the magnetic circuit; And a step of placing the inner periphery fixing portion of the damper on the engagement portion at the center of the jig, a step of connecting the diaphragm and the voice coil to form a vibration system, and a vibration system. Placing the voice coil in the magnetic gap of the magnetic circuit, placing the voice coil on the engaging portion of the jig, and connecting the protruding portion of the diaphragm and the inner peripheral fixing portion of the damper; Removing the jig from the back side of the magnetic circuit.

  The operation of the present invention will be described below.

  The electrodynamic speaker of the present invention is defined by a diaphragm formed by injection molding of a resin material, a voice coil connected to the diaphragm, a magnetic circuit having a magnetic gap into which the voice coil is inserted, and a voice coil. A damper disposed inside the space and having an inner peripheral side connected to a central side of the diaphragm and an outer peripheral side fixed to a magnetic circuit. That is, the electrodynamic speaker is an electrodynamic speaker with an inner damper in which a damper is provided inside the cylinder of the voice coil bobbin.

  The electrodynamic speaker may further include a frame that has a substantially basket-like base and is connected to the magnetic circuit and accommodates the diaphragm, and an outer peripheral end of the diaphragm and an edge connected to the frame. The magnetic circuit may be an internal magnetic type or an external magnetic type as long as it includes a top plate or a pole piece that forms a magnetic gap and connects the outer peripheral fixed portion of the damper. In addition, the substantially basket-shaped base means that the front side of the frame constituting the edge mounting portion or the mounting portion and the rear side of the frame constituting the magnetic circuit fixing portion or the damper mounting portion are connected to define the window portion. And a connecting portion to be at least included in the shape.

  The diaphragm includes a thin diaphragm portion and a protrusion extending in a direction in which the magnetic circuit is positioned on the center side of the diaphragm portion, and the diaphragm and the edge may be integrally formed. The projection corresponding to the gate portion of the injection molding is a thick and columnar portion that extends on the center side of the diaphragm portion and extends in the direction in which the magnetic circuit is located. Therefore, the damper arranged inside the space defined by the voice coil, the inner periphery fixing part that connects the projection of the diaphragm, the outer periphery fixing part that connects to the magnetic circuit, the inner periphery fixing part and the outer periphery fixing part, By forming so as to include a support movable part that couples the two in a vibrating manner, an electrodynamic speaker including an inner damper can be configured.

  When the diaphragm and the edge formed by injection molding of the resin material are integrally formed, at least the movable movable part of the diaphragm and the edge are made of different materials, and the edge is connected to the outer peripheral end of the diaphragm. An inner peripheral fixed portion, an outer peripheral fixed portion fixed to the frame, and a support movable portion that couples the inner peripheral fixed portion and the outer peripheral fixed portion so as to be able to vibrate. That is, the diaphragm and the edge may be integrally formed with different resins by a method such as two-color molding, and at least the movable movable part of the diaphragm and the edge may be made of different materials. In the case where the diaphragm and the outer periphery fixing portion of the edge corresponding to the gasket for attaching the edge to the frame are made of the same material, the vibration system including the preliminarily preprocessed tinsel wire is arranged from one side of the base of the frame. The process of moving toward the other side and placing it at a predetermined position becomes easy, and the number of steps can be reduced.

  When the magnetic circuit of the electrodynamic speaker includes a central through hole communicating with the space defined by the voice coil from the back side at the center and a plurality of through holes communicating with the magnetic gap from the back side. An electrodynamic speaker can be manufactured by inserting and removing a jig having a plurality of engaging portions at predetermined positions on a plate-like substrate from the back side. That is, the magnetic circuit is placed on a jig having a plurality of engaging portions at a predetermined position of the plate-like substrate, and the engaging portions are inserted into the central through hole and the plurality of through holes of the magnetic circuit from the back side of the magnetic circuit. If inserted, the diaphragm, the voice coil, and the damper can be easily connected with the damper disposed inside the cylinder of the voice coil bobbin. The outer periphery fixing part of the damper is connected to the magnetic circuit, the inner periphery fixing part of the damper is placed on the engaging part at the center of the jig, and the voice coil having the diaphragm connected in advance is connected to the magnetic gap of the magnetic circuit. The vibration system of the electrodynamic speaker can be vibrated by placing the voice coil on the engaging part of the jig and connecting the protruding part of the diaphragm and the inner periphery fixing part of the damper. Can be configured.

  Even if the electrodynamic speaker of the present invention is a speaker in which a damper is provided inside the cylinder of the voice coil bobbin, an electrodynamic speaker capable of reducing the number of manufacturing steps can be provided.

1 is a perspective view illustrating an electrodynamic speaker 1 according to a preferred embodiment of the present invention. Example 1 1 is a rear perspective view illustrating an electrodynamic speaker 1 according to a preferred embodiment of the present invention. Example 1 It is an expanded view explaining the electrodynamic speaker 1 by preferable embodiment of this invention. Example 1 It is a back side perspective view explaining the structure of the diaphragm 2 and edge 3 by preferable embodiment of this invention. Example 1 It is sectional drawing explaining the manufacturing method of the electrodynamic speaker 1 by preferable embodiment of this invention. Example 1 It is sectional drawing explaining the manufacturing method of the electrodynamic speaker 1 by preferable embodiment of this invention. Example 1

  Hereinafter, although the electrodynamic speaker by the preferable embodiment of this invention and its manufacturing method are demonstrated, this invention is not limited to these embodiment.

1 and 2 are diagrams illustrating an electrodynamic speaker 1 according to a preferred embodiment of the present invention. Specifically, FIG. 1 is a perspective view of the electrodynamic speaker 1 viewed from the front side, and FIG. 2 is a perspective view of the electrodynamic speaker 1 viewed from the back side. FIG. 3 is a developed view for explaining the configuration of the electrodynamic speaker 1 and is a perspective view excluding some parts unnecessary for explanation. FIG. 4 is a rear perspective view illustrating the configuration of the diaphragm 2 and the edge 3. 5 and 6 are cross-sectional views illustrating a method for manufacturing the electrodynamic speaker 1. A part of the structure of the electrodynamic speaker 1 that is not necessary for the description, an internal structure, and the like are omitted. Further, the direction in which the straight line (long axis) connecting the points A-O-A ′ extends is the major axis direction, and the point B-O-B ′.
The direction in which the straight line (minor axis) connecting the two extends is the minor axis direction.

  The electrodynamic speaker 1 of this embodiment is an elongated electrodynamic speaker having a track-shaped diaphragm 2, and is an electrodynamic type of an inner type damper in which a damper 5 is provided inside a cylinder of a bobbin 4 b of a voice coil 4. It is a speaker. The outer peripheral end of the diaphragm 2 is supported by the edge 3, and the outer peripheral end of the edge 3 is fixed to the frame 6. The frame 6 has an elongated shape corresponding to the track-shaped diaphragm 2, and the magnetic circuit 10 fixed so as to be accommodated in the frame 6 also has an elongated shape having a narrow width in the minor axis direction. . Therefore, the electrodynamic speaker 1 is an electrodynamic speaker suitable for a device with a small width for mounting the speaker, such as a side surface of a display unit included in a device such as a display. A terminal 8 to which an audio signal current is supplied is attached to the side surface of the frame 6, and a part of the magnetic circuit 10 is exposed on the back side.

  The diaphragm 2 of the present embodiment is a track-shaped speaker diaphragm having a track-shaped outer dimension of about 12 mm × 36 mm and formed of a polyolefin-based thermoplastic resin to a thickness of about 0.2 mm. The outer peripheral end is freely supported by the edge 3 so as to vibrate. The diaphragm 2 includes a plurality of ribs in the diaphragm portion 2a on the center side, and the voice coil 4 is connected from the back side to a boundary portion with an outer peripheral end portion having a shallow cross section.

  Since the diaphragm 2 is formed by injection molding of a resin material, as shown in FIG. 4, the diaphragm 2 a is thin, and in the back side where the magnetic circuit 10 is located at the center of the diaphragm 2 a. And an extended protrusion 2b. The protrusion 2b of the diaphragm 2 corresponds to a gate part of injection molding, and is a thick and columnar part extending in the direction in which the magnetic circuit 10 is located on the center side of the diaphragm 2a. Therefore, the diaphragm 2 is supported so as to be able to vibrate by a later-described damper 5 that is connected to the protrusion 2b on the inner peripheral side and is fixed to the magnetic circuit 10 on the outer peripheral side.

  The edge 3 includes an inner peripheral fixing portion 3a connected to the outer peripheral end of the diaphragm 2, an outer peripheral fixing portion 3b fixed to an edge mounting portion 61 of the frame 6 described later, an inner peripheral fixing portion 3a, and an outer peripheral fixing portion 3b. And a support movable portion 3c that connects the two in a vibrating manner. The outer periphery fixing portion 3b may be used as a gasket with a thickness. Moreover, the support movable part 3c may be a roll edge having a substantially roll-shaped cross section or a corrugation edge having corrugation. The edge 3 may be formed by forming the support movable portion 3c from a different material that is softer and lower in hardness than the inner peripheral fixed portion 3a and the outer peripheral fixed portion 3b, and is a polyolefin-based thermoplastic resin or other polystyrene-based thermoplastic resin. , Polyethylene thermoplastic resins, polyurethane thermoplastic resins, and the like. The edge 3 may be formed by being connected to the diaphragm 2 manufactured separately by an adhesive, or may be formed integrally with the diaphragm 2 by a manufacturing method such as two-color molding as in this embodiment. Good. When the outer periphery fixing portion 3b of the diaphragm 2 and the edge 3 is made of the same material by a manufacturing method such as two-color molding, the diaphragm 2 and the edge 3 are integrated in advance. In the manufacturing process, the number of work steps can be reduced.

  The voice coil 4 is formed in a track shape by winding a coil 4a around a cylindrical bobbin 4b. Further, the one end side of the tinsel wire 7 is connected and fixed to the coil 4 a of the voice coil 4. Accordingly, the two tinsel wires 7 are connected to both ends of the coil 4 a in order to supply a voice signal to the voice coil 4. Further, the other end side of the tinsel wire 7 is connected and fixed to a terminal 8 fixed to the frame 6 described later. The voice coil 4 has a damper 5 disposed inside the cylinder of the bobbin 4b.

  The damper 5 is a damper that is formed by impregnating a phenolic resin with a woven fabric of flexible fibers as a base material. The damper 5 connects the inner periphery fixing portion 5a connected to the protrusion 2b of the diaphragm 2, the outer periphery fixing portion 5b connected to the magnetic circuit 10, and the inner periphery fixing portion 5a and the outer periphery fixing portion 5b so as to vibrate. Support movable portion 5c. In the damper 5 of this embodiment, the inner periphery fixing portion 5a and the outer periphery fixing portion 5b are round in shape, but the outer periphery fixing portion 5b may be an elongated and irregularly shaped damper. It may be a butterfly damper formed by injection molding, or a member formed by pressing a resin plate. The damper 5 is connected to the diaphragm 2 or the magnetic circuit 10 with an adhesive.

  The frame 6 is formed of a resin and has a substantially basket-like base. The frame 6 connects an edge mounting portion for mounting the edge 3 formed on one side of the base, a magnetic circuit mounting portion for mounting a magnetic circuit formed on the other side of the base, and the edge mounting portion and the magnetic circuit mounting portion. And a connecting portion that defines a plurality of window portions, and a terminal fixing portion that fixes the two terminals 8. Screw holes for attaching the electrodynamic speaker 1 to another housing or the like are formed at the four corners of the edge attaching portion of the base. The frame 6 may be a metal frame formed by press-molding a steel plate.

  The magnetic circuit 10 includes a yoke 11 having a bowl-shaped cross section, and an annular magnet 12 and a plate 13 each having a through-hole are placed on the inside thereof, and a track shape is formed between the plate 13 and the side wall of the yoke 11. This is an internal magnet type magnetic circuit that forms the magnetic gap 14. As a result, since a magnetic field having a high magnetic flux density is formed in the magnetic gap 14, the coil 4 a of the voice coil 4 is disposed in the magnetic gap 14 in the electrodynamic speaker 1. The magnetic circuit 10 is connected to a magnetic circuit mounting portion of the frame 6. As shown in FIG. 2, the yoke 11 of the magnetic circuit 10 includes a plurality of through holes on the back side thereof, so that the magnetic circuit 10 includes a central through hole 15 communicating with the front side and a magnetic gap 14. Four through holes 16 communicating with each other are defined. Each member constituting the magnetic circuit 10 is fixed with an adhesive. The magnetic circuit 10 is also fixed to the fixing portion of the frame 6 with an adhesive. As long as the magnetic circuit 10 includes a top plate or a pole piece that forms a linear magnetic gap 14 and connects the outer periphery fixing portion 5b of the damper 5, an internal magnetic type or an external magnetic type may be used. Regardless, it is not limited to the structure of a present Example.

  As described above, the electrodynamic speaker 1 of the present embodiment has the diaphragm 2 extending in the direction in which the magnetic circuit 10 is positioned on the center side of the diaphragm 2a and the diaphragm 2a. 2b, and the damper 5 is connected to the protrusion 2b of the diaphragm 2 with the inner peripheral fixed portion 5a, the outer peripheral fixed portion 5b connected with the magnetic circuit 10, the inner peripheral fixed portion 5a and the outer peripheral fixed portion 5b. Since the support movable part 5c which couple | bonds so that it can vibrate is included, as shown in FIG.5 and FIG.6, the structure provided with an inner type damper is attained.

  In the manufacturing process of the electrodynamic speaker 1 of the present embodiment, as shown in FIGS. 5 and 6, the magnetic circuit 10 is placed on a predetermined assembly jig 20, and the frame 6 is placed thereon. If the diaphragm 2 and the vibration system including the edge 3 and the voice coil 4 are placed in order, the coil 4 a of the voice coil 4 is arranged in the magnetic gap 14 of the magnetic circuit 10. can do. The assembly jig 20 is engaged from the flat base 21 to the engaging portion 22 that engages with the central through hole 15 of the magnetic circuit 10 and the through hole 16 that communicates with the magnetic gap 14 of the magnetic circuit 10. The joint portion 23 is provided so as to protrude. The front end of the engaging portion 22 defines a position where the protrusion 2 b of the diaphragm 2 and the inner peripheral fixing portion 5 a of the damper 5 are connected, and the stepped portion of the engaging portion 23 is a magnetic gap 14 of the magnetic circuit 10. The predetermined position where the coil 4a of the voice coil 4 can vibrate is defined.

  Specifically, in the manufacturing process of the electrodynamic loudspeaker 1, the magnetic circuit 10 is formed in advance, the magnetic circuit 10 is placed on the assembly jig 20 having the engaging portions 22 and 23, and the center of the magnetic circuit 10 is placed. The respective engaging portions 22 and 23 corresponding to the through holes 15 and the four through holes 16 are inserted from the back side of the magnetic circuit 10. Next, the outer periphery fixing portion 5b of the damper 5 is connected to the plate 13 of the magnetic circuit 10 with an adhesive, and the inner periphery fixing portion 5a of the damper 5 is mounted on the engagement portion 22 at the center of the assembly jig 20. Put. Further, the diaphragm 2 and the voice coil 4 are connected to form a vibration system in advance, the voice coil 4 constituting the vibration system is disposed in the magnetic gap 14 of the magnetic circuit 10, and the voice coil 4 is assembled. While mounting on the engaging part 23 of the jig | tool 20, the projection part 2b of the diaphragm 2 and the inner peripheral fixing | fixed part 5a of the damper 5 are connected with an adhesive agent. Therefore, if the assembly jig 20 is removed after the adhesive is solidified, the speaker vibration system including the diaphragm 2, the edge 3, the coil 4, and the damper 5 can vibrate with respect to the frame 6 and the magnetic circuit 10. Supported.

  When the diaphragm 2 and the edge 3 are integrally formed by injection molding of a resin material as in this embodiment, at least the movable movable portion 3c of the diaphragm 2 and the edge 3 is made of different materials. . That is, the diaphragm 2 and the edge 3 may be integrally formed with different resins by a method such as two-color molding, and at least the movable movable portion 3c of the diaphragm 2 and the edge 3 is made of different materials. Good. The edge 3 may be formed by connecting the diaphragm 2 separately manufactured with an adhesive, but the diaphragm 2 and the outer peripheral fixing portion 3b corresponding to a gasket for attaching the edge 3 to the frame 6 are the same. In the case of being made of a material, the step of moving the vibration system including the preliminarily processed broiler wire 7 from one side to the other side of the base body of the frame 6 and placing it at a predetermined position becomes easy.

  The electrodynamic speaker 1 can easily place the voice coil 4 at a predetermined position in the magnetic gap 14 of the magnetic circuit 10 in the manufacturing process as compared with a conventional speaker in which a damper is provided inside the cylinder of the voice coil bobbin. Man-hours can be reduced. As a result of configuring the vibration system including the damper 5, the damper 5 supports the voice coil 4 so that it can vibrate substantially at the center position. An excellent electrodynamic speaker 1 can be obtained.

  The electrodynamic speaker 1 of the above embodiment is a track-type speaker whose short axis direction is shorter than the long axis direction. The electrodynamic speaker 1 includes a cone-shaped diaphragm having a circular outer diameter. The present invention can also be applied to a speaker using a substantially circular frame corresponding to a plate. When there is a restriction on the shape and size of a substantially circular frame in a small speaker, the vibration system including the damper 5 can be configured, so that the voice coil 4 comes into contact with other parts and generates abnormal noise. And a stable speaker can be realized.

  The electrodynamic speaker of the present invention can be applied not only as a speaker built in video / audio equipment such as a display but also to a game machine having a cabinet with a built-in speaker for reproducing sound, a game machine such as a slot machine, etc. It is. The electrodynamic speaker and the manufacturing method thereof according to the present invention can be applied not only to a small speaker but also to a headphone.

1, 1a Speaker 2 Diaphragm 3, 30 Edge 4 Voice coil
5 Damper 6 Frame 7 Kinshi Wire 8 Terminal 10 Magnetic Circuit 20 Assembly Jig

Claims (5)

A diaphragm formed by injection molding of a resin material, a voice coil connected to the diaphragm, a magnetic circuit having a magnetic gap into which the voice coil is inserted, and a space defined by the voice coil A damper whose inner peripheral side is connected to the center side of the diaphragm and whose outer peripheral side is fixed to the magnetic circuit,
The diaphragm includes a thin diaphragm part, and a thick and columnar protrusion extending in a direction in which the magnetic circuit is located on the center side of the diaphragm part,
The damper is an inner peripheral fixed portion that is connected to the protrusion of the diaphragm, an outer peripheral fixed portion that is connected to the magnetic circuit, and a movable support that connects the inner peripheral fixed portion and the outer peripheral fixed portion so as to vibrate. Including
Electrodynamic type speaker. A frame having a substantially basket-like base and connected to the magnetic circuit to accommodate the diaphragm; and an outer peripheral end of the diaphragm and an edge connected to the frame;
An inner peripheral fixed portion that is connected to the outer peripheral end of the diaphragm, an outer peripheral fixed portion that is fixed to the frame, and a movable movable portion that connects the inner peripheral fixed portion and the outer peripheral fixed portion so that the edge can vibrate. And including
The diaphragm and the edge are integrally formed, and at least the diaphragm and the support movable part of the edge are made of different materials.
The electrodynamic speaker according to claim 1. The magnetic circuit includes a top plate or a pole piece that forms the magnetic gap and connects the outer periphery fixing portion of the damper.
The electrodynamic speaker according to claim 1 or 2. The magnetic circuit includes a central through hole that communicates with the space defined by the voice coil from the back side at the center, and a plurality of through holes that communicate with the magnetic gap from the back side.
The electrodynamic speaker according to any one of claims 1 to 3. It is a manufacturing method of the electrodynamic speaker according to claim 4,
Forming the magnetic circuit;
The magnetic circuit is placed on a jig having a plurality of engaging portions at predetermined positions of a plate-like base, and the engaging portions are placed in the central through hole and the plurality of through holes of the magnetic circuit. Inserting from the back side of
Connecting the outer periphery fixing portion of the damper to the magnetic circuit, and placing the inner periphery fixing portion of the damper on the engaging portion at the center of the jig;
Connecting the diaphragm and the voice coil to form a vibration system;
The voice coil constituting the vibration system is disposed in the magnetic gap of the magnetic circuit, and the voice coil is placed on the engaging portion of the jig, and the protrusion of the diaphragm Connecting the damper and the inner periphery fixing portion of the damper;
Removing the jig from the back side of the magnetic circuit;
For producing an electrodynamic speaker including

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