JP5549435B2 - Speaker frame and electrodynamic speaker using the same - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodynamic speaker including a frame made of a resin material integrated with a drain cover, and more particularly, to a speaker frame that is lightweight and rigid and suitable for mounting on a vehicle such as an automobile, and an electrodynamic speaker using the same. .

  In a speaker attached to a vehicle such as an automobile, it is desired to reduce the size and weight of a speaker that reproduces sound from the viewpoint of energy saving. In particular, in an electrodynamic speaker having a magnetic circuit, the magnetic circuit may be reduced in size and weight, and the frame attached to the magnetic circuit may be reduced in weight. The speaker frame supports the speaker diaphragm so as to vibrate and forms an attachment portion to the vehicle. There is a speaker attached to a vehicle in which a drain cover is formed integrally with a resin frame on which resin such as ABS is injection-molded.

  If the resin frame that integrates the drain cover is made lighter and its skeleton is made thin or thin, unnecessary vibration will occur due to insufficient rigidity required to attach a heavy magnetic circuit, or drain Due to the lack of rigidity of the cover, there may be a problem that the frame is damaged when the speaker is attached to the vehicle or when a large impact is applied to the vehicle. Therefore, conventionally, various frames and electrodynamic speakers using the same have been proposed in order to solve these problems.

  Conventionally, a magnetic circuit in which a magnetic gap is formed, a frame that is provided with an arcuate standing wall on at least the upper and lower sides on the back side in the attached state, and coupled to the upper surface of the magnetic circuit, and fits in the magnetic gap There is a speaker composed of a diaphragm that is coupled around a voice coil and has an outer peripheral portion coupled to the periphery of the frame. (Patent Document 1).

  In addition, a magnetic coil, a frame formed by resin molding coupled to the magnetic circuit, and a voice coil in which the outer periphery is adhesively bonded to the frame, and the inner periphery is disposed below the magnetic gap of the magnetic circuit. A speaker formed by an adhesively bonded diaphragm, an inner periphery adhesively bonded to the voice coil, and an outer periphery adhesively bonded to the frame to support the voice coil in a vertically movable manner, There is a speaker in which polygonal ribs are integrally provided at the time of resin molding at a portion of the frame excluding at least a coupling portion with the magnetic circuit. (Patent Document 2).

Japanese Patent No. 3327014 (FIGS. 1 to 6) JP 2008-193371 A (FIGS. 1 to 3)

  However, it is desired to further reduce the weight of the speaker frame. When using a resin frame to reduce the weight of the speaker, if the mounting part of the frame to the vehicle is molded with resin, it will be higher due to mounting screws or the like around the mounting hole defined by the thinly formed mounting part Pressure may be applied, resulting in problems such as breakage of the mounting portion. On the other hand, if the frame and the drain cover are thick and the rigidity is increased, there is a problem that the weight reduction may not be sufficient. If the rigidity of the entire frame is insufficient, there is a problem that the result is an electrodynamic speaker with inferior sound reproduction capability.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a frame made of a resin material in which a drain cover is integrated, and an electrodynamic speaker including the frame. Another object of the present invention is to provide a speaker frame that is excellent in sound reproduction capability and suitable for mounting on a vehicle such as an automobile, and an electrodynamic speaker using the same.

  The speaker frame of the present invention includes an annular portion having an edge fixing portion for fixing the outer peripheral end side of the edge, a magnetic circuit fixing portion for fixing the magnetic circuit, a drain cover portion extending rearward from the annular portion, A plurality of first connecting portions for connecting the magnetic circuit fixing portion and the annular portion; and a plurality of second connecting portions for connecting the magnetic circuit fixing portion and the drain cover portion; and the annular portion and the first connecting portion. The connecting portion is arranged in front of the magnetic circuit fixing portion, and the connecting portion between the drain cover portion and the second connecting portion is arranged behind the first connecting portion.

  In the speaker frame of the present invention, the drain cover portion has a plurality of cylindrical portions formed so as to protrude inward from the inner curved surface and including a connecting portion with the second connecting portion, and the front of the cylindrical portion. The end side is closed by the annular part, and the rear end side of the cylindrical part is opened.

  In the speaker frame of the present invention, the width dimension in the circumferential direction of the second connecting portion is formed wider than the width dimension in the circumferential direction of the first connecting portion.

  Preferably, in the speaker frame of the present invention, the drain cover portion further includes a plurality of attachment portions that define attachment holes at positions where the second connection portion extends substantially in the radial direction.

  In the electrodynamic speaker of the present invention, the magnetic circuit fixing part further includes a damper fixing part for fixing the outer peripheral part of the damper.

  The electrodynamic speaker according to the present invention includes a speaker frame, a magnetic circuit fixed to the magnetic circuit fixing portion, a voice coil having a coil disposed in a magnetic gap of the magnetic circuit, A speaker diaphragm connected on the side, and an edge connected to an outer peripheral end side of the speaker diaphragm and an edge fixing portion of the annular portion.

  The electrodynamic speaker of the present invention further includes a damper connected to the damper fixing portion of the voice coil and the speaker frame.

  The operation of the present invention will be described below.

  The speaker frame of the present invention is a basket-like frame formed of a resin material with which a drain cover is integrated, and has an annular shape having an edge fixing portion for fixing the outer peripheral end side of the speaker diaphragm or the edge on the front outer peripheral side. A magnetic circuit fixing portion that fixes the magnetic circuit on the inner peripheral side of the back surface, a drain wall-shaped drain cover portion extending from the annular portion to the rear side (rear side), a magnetic circuit fixing portion and an annular portion, And a plurality of second connection parts for connecting the magnetic circuit fixing part and the rear end part of the drain cover part. The magnetic circuit fixing portion of the speaker frame may further include a damper fixing portion that fixes the outer peripheral portion of the damper, and the annular portion or the drain cover portion further includes a plurality of mounting portions that define mounting holes. It may be.

  An electrodynamic speaker using the speaker frame of the present invention includes a magnetic circuit fixed to a magnetic circuit fixing portion of the speaker frame, a voice coil having a coil disposed in a magnetic gap of the magnetic circuit, and a voice coil. A speaker diaphragm coupled on the center side; and an edge coupled to an outer peripheral end side of the speaker diaphragm and an edge fixing portion of the annular portion. Furthermore, you may provide the damper connected with a voice coil and a damper fixing | fixed part. The speaker circuit magnetic circuit fixing portion, the annular portion, and the plurality of first connecting portions and second connecting portions form a window portion which is a through hole, and a speaker vibration system including a speaker diaphragm and a voice coil is provided. Exposed from the window.

  In the speaker frame of the present invention, the vertical wall-shaped drain cover portion extending from the annular portion to the back side is attached to the magnetic circuit fixing portion when the speaker frame is attached to a vehicle or the like, or Cover the speaker vibration system exposed from the window so that it will not be exposed to rainwater. In the speaker frame of the present invention, the connecting portion between the annular portion and the first connecting portion is disposed in front of the magnetic circuit fixing portion, and the connecting portion between the drain cover portion and the second connecting portion is the first connecting portion. It is arranged behind the part. As described above, since the first connecting portion and the second connecting portion extend in different directions from the magnetic circuit fixing portion and are connected to the rear end portion of the annular portion or the drain cover portion, the speaker frame including the drain cover portion is provided. The rigidity can be increased, and the weight can be reduced.

  In the speaker frame in which the circumferential width dimension of the second coupling portion is wider than the circumferential width dimension of the first coupling portion, resonance and deformation of the drain cover portion are suppressed, and rigidity is further increased. Further, if the drain cover portion further includes a plurality of attachment portions that define attachment holes at positions where the second connecting portion extends substantially in the radial direction, the strength when attached to a vehicle or the like is sufficient. Can be secured.

  Further, the drain cover portion of the speaker frame has a cylindrical portion that protrudes inward from the inner curved surface. The cylindrical portion includes a connecting portion between the drain cover portion and the second connecting portion, the front end side of the cylindrical portion is closed by the annular portion, and the rear end side of the cylindrical portion is opened. As a result, the cylindrical portion is formed with a cylindrical space that extends out to the rear surface side, so that it is possible to increase meat stealing and contribute to weight reduction of the speaker frame. Furthermore, since the cylindrical space defines a space that goes out to the rear surface side, in the injection mold for molding the speaker frame, the second connecting portion that connects to the rear end portion of the drain cover portion without causing an undercut is provided. Can be formed. Therefore, it is not necessary to use an expensive slide mold or the like, and the production cost of the speaker frame can be reduced.

  An electrodynamic speaker having a frame made of a resin material in which a drain cover is integrated is provided. The speaker frame is lightweight, excellent in sound reproduction capability, and suitable for mounting on a vehicle such as an automobile, and an electrodynamic speaker using the same. can do.

It is sectional drawing explaining the electrodynamic speaker 1 by preferable embodiment of this invention. Example 1 It is sectional drawing explaining the structure of the flame | frame 10 for speakers by preferable embodiment of this invention. Example 1 It is a top view explaining the structure of the flame | frame 10 for speakers by preferable embodiment of this invention. Example 1 It is a perspective view explaining the structure of the flame | frame 10 for speakers by preferable embodiment of this invention. Example 1

  Hereinafter, a speaker frame and an electrodynamic speaker according to preferred embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

  FIG. 1 is a diagram illustrating an electrodynamic speaker 1 according to a preferred embodiment of the present invention. 2, 3, and 4 are diagrams illustrating the configuration of the speaker frame 10 that constitutes the electrodynamic speaker 1. Specifically, FIG. 1 is a cross-sectional view of the electrodynamic speaker 1 corresponding to an OA cross section in which the right half side is omitted from the central axis (not shown) passing through the central point O in FIG. 2 is an OB cross-sectional view of the speaker frame 10. FIG. 3 is a plan view of the speaker frame 10 as seen from the front side to which the speaker diaphragm is attached. Further, FIG. 4 is a perspective view of the speaker frame 10 as viewed from the back side to which the magnetic circuit is attached, and the front side to which the speaker diaphragm 2 is attached is illustrated on the back side of FIG. As will be described later, a part of the structure of the electrodynamic speaker 1, the internal structure, and the like are omitted.

  The electrodynamic speaker 1 of the present embodiment is an electrodynamic speaker having a circular speaker diaphragm 2 having a diameter of about 16 cm, and is used for a vehicle that is reduced in weight so as to be attached to a vehicle body (not shown). It is a speaker. The cone-shaped speaker diaphragm 2 is supported at its outer peripheral edge by an edge 3. The speaker diaphragm 2 of the present embodiment is a paper material to be made of paper, but may be composed of other materials. The outer peripheral end of the roll-shaped edge 3 is fixed to a resin frame 10, and a gasket 20 is attached to the front side thereof. The inner peripheral end of the edge 3 is connected to the outer peripheral end of the speaker diaphragm 2. A voice coil 4 is connected to the center of the speaker diaphragm 2 from the back side. The voice coil 4 is supported by a damper 5 so that the coil bobbin can vibrate. The damper 5 is a corrugation damper that is formed by impregnating a phenol resin with a woven fabric of flexible fibers as a base material, and an outer peripheral end thereof is fixed to the frame 10.

  The voice coil 4 has a coil wound around one end of a cylindrical coil bobbin, and this coil is disposed in a magnetic gap of a magnetic circuit fixed to the frame 10. The tinsel wire (not shown) connected to the voice coil 4 is electrically connected by soldering a terminal (not shown) fixed to the frame 10 and a lead wire of the coil 4 from the terminal, so that the voice coil 4 A current can be supplied. The tinsel wire may be electrically connected to the terminal by providing a metal eyelet on the speaker diaphragm 2. Since the dust cap 9 is attached to the center side of the speaker diaphragm 2 with an adhesive, the magnetic gap of the magnetic circuit and the end of the coil bobbin of the voice coil 4 are blocked so that dust such as iron powder does not enter. ing.

  The magnetic circuit of the present embodiment includes a pole 6 including a center pole portion, a ring-shaped magnet 7a fixed to the underplate portion of the pole 6, and a ring-shaped top plate 8 fixed to the upper surface side of the magnet 7. An outer magnet type magnetic circuit comprising a ring-shaped repulsive magnet 7b fixed to the upper surface side of the top plate 8, wherein a resin frame 10 is fixed between the top plate 8 and the repulsive magnet 7b. Yes. The magnetic circuit forms a high magnetic flux density DC magnetic field in an annular magnetic gap defined between the center pole portion of the pole 6 and the top plate 8. Therefore, when an audio current is supplied to the coil of the voice coil 4 disposed in the magnetic gap, a driving force acts on the voice coil 4 to vibrate the speaker diaphragm 2. Therefore, the electrodynamic speaker 1 can convert an audio signal current into a sound wave.

  The frame 10 is a speaker frame formed from ABS alloy resin. The frame 10 has an overall weight of about 40 g, and is lightweight as a speaker frame having a diameter of 16 cm formed from a resin material with which the drain cover is integrated. The frame 10 includes an annular portion 11 formed on the outer peripheral side of the front surface, a magnetic circuit fixing portion 12 formed on the inner peripheral side of the rear surface with respect to the annular portion 11, and a standing wall shape extending from the annular portion 11 to the rear side. The drain cover portion 13, the three first connecting portions 15 that connect the magnetic circuit fixing portion 12 and the annular portion 11, and the three first connecting portions that connect the magnetic circuit fixing portion 12 and the rear end portion of the drain cover portion 13. 2 is a substantially basket-like speaker frame including two connecting portions 16. From the vicinity of the rear end side of the drain cover portion 13, the flange 14 is formed so as to protrude outward in the radial direction over a round, and the flange 14 formed integrally with the drain cover portion 13 includes: Three attachment portions 14a that define attachment holes to be attached to the vehicle body of the vehicle are formed.

  The annular portion 11 of the frame 10 has an edge fixing portion 17 that fixes the outer peripheral end side of the edge 3 to which the speaker diaphragm 2 is connected. The magnetic circuit fixing portion 12 to which the magnetic circuit of the frame 10 is fixed has a center hole that communicates with the magnetic gap of the magnetic circuit, and a damper fixing portion 18 that fixes the outer peripheral portion of the damper 5. The edge fixing portion 17 and the damper fixing portion 18 are annular plane portions that bond the edge and the damper, respectively.

  Moreover, the drain cover part 13 is a standing wall-like part extended from the annular part 11 to the back side, and forms a cylindrical drain cover as shown in the figure. As will be described later, the drain cover portion 13 of the frame 10 has three cylindrical portions 13b formed so as to protrude radially inward from the inner curved surface 13a. The front end side of the cylindrical portion 13b is closed by the annular portion 11, and the rear end side of the cylindrical portion 13b is opened, and as a result, a cylindrical space 13c that escapes to the rear side is formed. As shown in the drawing, the drain cover portion 13 has a terminal connection portion 19 for connecting terminals (not shown). Further, a gasket 20 that protects the speaker vibration system including the speaker diaphragm 2 and the edge 3 is attached to the front side of the annular portion 11 of the frame 10. On the other hand, on the drain cover portion 13 of the frame 10, a gasket 21 is attached to a flange 14 formed on the rear end side so as to seal a space between an attachment portion such as a vehicle body.

  The first connecting portion 15 is a columnar portion having a U-shaped cross section that connects the magnetic circuit fixing portion 12 and the annular portion 11, and the two are set in a circumferential direction around the center point O. A total of six are provided at intervals of about 40 degrees. Since the annular portion 11 is disposed on the front side of the frame 10 when viewed from the magnetic circuit fixing portion 12, the first connecting portion 15 extends from the magnetic circuit fixing portion 12 toward the annular portion 11 on the front side. It becomes a structure. Therefore, the first connecting portion 15 has a connecting portion 15 a to the annular portion 11 disposed on the front side of the frame 10 with respect to the magnetic circuit fixing portion 12.

  On the other hand, the second connecting portion 16 is a columnar portion having a U-shaped cross section that connects the magnetic circuit fixing portion 12 and the rear end side of the drain cover portion 13, and has a center point O as the center. Three are provided at intervals of about 120 degrees in the circumferential direction. When viewed from the magnetic circuit fixing portion 12, the drain cover portion 13 extends from the annular portion 11 of the frame 10 to the back side, so that the second connecting portion 16 extends toward the rear end side of the drain cover portion 13. It becomes the structure that has been installed. Accordingly, the second connecting portion 16 is arranged such that the connecting portion 16 a with the drain cover portion 13 is located on the rear side of the frame 10 with respect to the connecting portion 15 a with the annular portion 11.

  The magnetic circuit fixing portion 12 of the frame 10, the annular portion 11, the respective first connecting portions 15, and the adjacent second connecting portions 16 form a window portion that is a through hole. Although the speaker vibration system including the speaker diaphragm 2, the voice coil 4, and the damper 5 is exposed from these window portions of the frame 10, the drain cover portion 13 is provided with a substantially cylindrical drain cover portion 13. 13 can cover the speaker vibration system exposed from the window so as not to be exposed to rainwater.

  Thus, in the frame 10, the first connecting portion 15 and the second connecting portion 16 extend from the magnetic circuit fixing portion 12 in the front-rear direction, and are connected to the rear end portion of the annular portion 11 or the drain cover portion 13. The rigidity including the drain cover portion 13 can be increased. Since the first connecting portion 15 and the second connecting portion 16 are arranged so as to appear to be switched in the circumferential direction around the magnetic circuit fixing portion 12, the resonance of the drain cover portion 13 formed thinly In addition, the rigidity can be further increased by suppressing deformation. In the frame 10 of the present embodiment, since the connecting portion 15a of the first connecting portion 15 and the connecting portion 16a of the second connecting portion 16 are arranged in the front-rear direction of the drain cover portion 13, high rigidity can be obtained from the structure. It is possible to reduce the average thickness or increase the partial meat theft. As a result, the frame 10 of the present embodiment can be reduced in weight as compared with the conventional case.

  In the frame 10, as shown in FIG. 3, the circumferential width W <b> 2 of the second coupling portion 16 is formed wider than the circumferential width W <b> 1 of the first coupling portion 15. In addition, in the frame 10, since the flange 14 provided at the rear end portion of the drain cover portion 13 corresponds to a position where the second connecting portion 16 is substantially extended in the radial direction, three attachments including attachment holes from the flange 14 are provided. The portion 14a is provided so as to substantially extend the second connecting portion 16 in the radial direction. Therefore, even when the attachment part 14a of the frame 10 is attached to a vehicle or the like, the second connecting part 16 integrated by extending the attachment part 14a is not deformed, and the frame strength can be sufficiently secured.

  Further, the drain cover portion 13 of the frame 10 of the present embodiment has the three cylindrical portions 13b formed to protrude inward from the inner curved surface 13a as described above. The cylindrical portion 13b corresponds to each of the three second connecting portions 16 as shown in the drawing, includes a connecting portion 16a with the second connecting portion 16, and the front end side of the cylindrical portion 13b is formed by the annular portion 11. It is closed and the rear end side of the cylindrical portion 13b is opened, and as a result, a cylindrical space 13c is formed that extends to the rear surface side.

  The cylindrical space 13 c of the drain cover portion 13 can contribute to weight reduction of the frame 10 by increasing meat theft. Further, since the cylindrical space 13c defines a space that extends out to the rear surface side, in the injection mold for molding the frame 10, a second connecting portion that is connected to the rear end portion of the drain cover portion 13 without causing an undercut. 16 can be formed. As a result, it is not necessary to use a slide mold or the like that increases the cost, so that the production cost of the frame 10 can be reduced.

  Therefore, in the frame 10 of the present embodiment, a structure that is less likely to break than the conventional frame can be realized when a larger force is applied. As described above, in the frame 10 of the present embodiment, high rigidity can be obtained from the structure, and therefore the reinforcing ribs and the like necessary for obtaining the same rigidity as in the conventional case can be partially removed. As a result, the weight can be reduced in the range of about 8 to 15 g as compared with the conventional case.

  In the frame 10 of the present embodiment, the six first connecting portions 15 and the three second connecting portions 16 appear at intervals of about 40 degrees in the circumferential direction around the magnetic circuit fixing portion 12. Although it arrange | positions, the number and arrangement | positioning of the some 1st connection part 15 and the 2nd connection part 16 are not limited to said Example. The plurality of first connecting parts 15 and the second connecting parts 16 may be at least two or more, and may be four or five, respectively, and is not limited to the same number. The interval at which the first connecting portion 15 and the second connecting portion 16 are arranged is not limited to the case where they are arranged at substantially equal angles in the circumferential direction.

  In addition, the resin frame for a speaker according to the present invention is arranged such that the first connecting portions 15 are partially adjacent to each other, or the second connecting portions 16 are partially adjacent to each other. The case is also included. In the frame 10 of this embodiment, the connecting portion 15 of the first connecting portion 15 is arranged in the front direction of the magnetic circuit fixing portion 12, and the connecting portion 16 a of the second connecting portion 16 is more than the connecting portion 15 of the first connecting portion 15. May be disposed rearward. A first connecting portion 15 that connects the magnetic circuit fixing portion 12 and the annular portion 11 and a second connecting portion 16 that connects the magnetic circuit fixing portion 12 and the rear end side of the drain cover portion 13 are fixed to the magnetic circuit. If it arrange | positions so that it may appear alternately in the circumferential direction around the part 12, it can improve the rigidity of a resin frame further, and is preferable.

  Further, the electrodynamic speaker 1 using the frame 10 of this embodiment is an electrodynamic speaker for a vehicle having a circular speaker diaphragm 2. However, the speaker diaphragm 2 having an oval or rectangular outer diameter. Even a frame having an oval shape or a rectangular annular portion suitable for the above may be a resin frame provided with a drain cover. Even if a drain cover is provided, the required rigidity can be maintained and the weight of the vehicle can be reduced.

  The speaker frame and the electrodynamic speaker using the same according to the present invention reproduce not only an electrodynamic speaker attached to a vehicle that requires a drain cover but also a speaker incorporated in a video / audio device such as a display or sound. The present invention can also be applied to game machines having a cabinet with a built-in speaker, game machines such as slot machines.

DESCRIPTION OF SYMBOLS 1 Electrodynamic type speaker 2 Speaker diaphragm 3 Edge 4 Voice coil 5 Damper 6 Pole 7a Magnet 7b Repulsive magnet 8 Top plate 9 Dust cap 10 Frame 11 Annular part 12 Magnetic circuit fixing part 13 Drain cover part 14 Flange 15 1st connection part 16 Second connecting portion 17 Edge fixing portion 18 Damper fixing portion 19 Terminal connecting portion 20, 21 Gasket

Claims (5)

An annular portion having an edge fixing portion for fixing the outer peripheral end side of the edge; a magnetic circuit fixing portion for fixing a magnetic circuit; a drain cover portion extending rearward from the annular portion; the magnetic circuit fixing portion; A plurality of first connecting parts for connecting the annular part, and a plurality of second connecting parts for connecting the magnetic circuit fixing part and the drain cover part, and the annular part and the first connecting part A connecting portion is disposed in front of the magnetic circuit fixing portion, and a connecting portion between the drain cover portion and the second connecting portion is disposed behind the first connecting portion ,
The circumferential width dimension of the second connecting portion is formed wider than the circumferential width dimension of the first connecting portion, and the drain cover portion substantially extends the second connecting portion in the radial direction. Ru comprising a plurality of mounting portion defining a mounting hole in a position,
Speaker frame. The drain cover portion has a plurality of cylindrical portions formed so as to protrude inward from an inner curved surface thereof and including a connecting portion with the second connecting portion, and a front end side of the cylindrical portion is blocked by the annular portion. The rear end side of the tubular part is open,
The speaker frame according to claim 1. The magnetic circuit fixing part further includes a damper fixing part for fixing an outer peripheral part of the damper,
The speaker frame according to claim 1 or 2 . The speaker frame according to any one of claims 1 to 3 ,
The magnetic circuit fixed to the magnetic circuit fixing unit;
A voice coil having a coil disposed in a magnetic gap of the magnetic circuit;
A speaker diaphragm connected to the voice coil on the center side;
An edge connected to an outer peripheral end side of the speaker diaphragm and the edge fixing portion of the annular portion;
An electrodynamic type speaker. A damper connected to the damper fixing portion of the voice coil and the speaker frame;
The electrodynamic speaker according to claim 4 .

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