JP2014033328A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker which has a simple structure, enables easy arrangement of a voice coil, and improves the stability of vertical vibrations.SOLUTION: The speaker includes: a magnetic circuit having a magnetic gap formed between a yoke 24 and magnets 11a, 11b; a voice coil bobbin 6 housed in the magnetic gap G; a diaphragm 4 which supports the voice coil bobbin 6; a frame 2 which holds the diaphragm 4, the frame 2 to which a part of the magnetic circuit is attached; and a damper unit 8 which connects the voice coil bobbin 6 with the frame 2. The yoke 24 is formed so as to partially have a cutout 27 extending in a vibration direction of the diaphragm. In the damper unit 8, multiple conductive film like dampers 13, 14, each of which includes a fixed part 31 fixed to an outer peripheral surface of the voice coil and a connection part 33 placed in the cutout 27, are placed so as to form a gap therebetween in a thickness direction.

Description

  The present invention relates to a speaker, and more particularly to a thin speaker used in an electronic device such as a thin television.

  In some small speakers, a damper is used to hold the voice coil in the correct position so that the voice coil can accurately perform vertical vibration. In these small speakers, various devices have been devised for the assembly configuration of each member and the damper so that the speaker can be miniaturized as much as possible. For example, in Patent Documents 1 and 2, other components that configure the damper and the speaker are used. A technique for preventing interference with a member is disclosed.

  In Patent Document 1, a speaker having a guide member having a rod-shaped guide piece for guiding the vertical vibration of the voice coil bobbin around the voice coil bobbin, and an insertion hole provided in the damper so that the guide piece does not interfere with the damper. Is disclosed.

  Further, in Patent Document 2, a yoke is partially cut out to extend from a plurality of locations on the opening side end of the voice coil bobbin, and each tip is fixed to the frame, and a damper is attached from the cutout. A speaker is disclosed that extends to the outside of a yoke and is fixed to a frame.

Japanese Patent Laid-Open No. 2002-300695 JP 2009-290815 A

  However, in the speaker of Patent Document 1, since the guide piece guides the outer surface of the voice coil bobbin, it is necessary to arrange the voice coil on the inner peripheral surface of the voice coil bobbin. The handling of the wire was troublesome, and the practicality was poor. Further, since the magnetic field of the magnetism generator is configured to follow the vibration direction of the voice coil, there is a problem in that the thickness dimension of the speaker becomes large and it cannot be applied to a small speaker.

  The speaker of Patent Document 2 has a feature that the stability of vertical vibration is large because the voice coil bobbin is supported at the lower end. However, since it is necessary to connect the lower end of the voice coil bobbin and the bottom surface of the frame, a certain distance between the voice coil bobbin and the bottom surface of the frame is required. Therefore, it is necessary to shorten the voice coil bobbin and the voice coil height. There was a problem that the pressure level became weak.

  Furthermore, the speaker of Patent Document 2 has a complicated handling of the voice coil lead wire, and there is a risk of disconnection due to metal fatigue due to vertical vibration. In addition, there is a problem that the vertical vibration of the voice coil is partially obstructed by the lead wire located in a part of the voice coil and is not uniform in the circumferential direction, and the vibration is skewed.

  Therefore, the technical problem to be solved by the present invention is to provide a thin speaker capable of improving the stability of vertical vibration with a simple configuration and easy voice coil handling.

  In order to solve the above technical problem, the present invention provides a speaker having the following configuration.

According to the first aspect of the present invention, a magnetic circuit having a magnetic gap formed between a yoke and a magnet, a voice coil bobbin housed in the magnetic gap, a diaphragm supporting the voice coil bobbin, In a loudspeaker having a diaphragm that holds a diaphragm and a part of the magnetic circuit is attached, and a damper unit that connects the voice coil bobbin and the frame,
The yoke is configured to partially have a notch extending in the vibration direction of the diaphragm,
In the damper unit, a plurality of conductive film dampers having a fixed portion fixed to the outer peripheral surface of the voice coil and a connecting portion arranged in the notch are arranged with a gap in the thickness direction. A speaker is provided.

  According to a second aspect of the present invention, there is provided the speaker according to the first aspect, wherein the membrane damper is connected to a voice coil bobbin so as to arrange the voice coil in the gap.

  According to a third aspect of the present invention, the film damper is composed of a member in which a synthetic resin film is coated with a metal, a lead wire of the voice coil is connected to the fixing portion, and the connecting portion is A speaker according to the first or second aspect is provided, wherein the speaker is connected to a wiring board.

  According to a fourth aspect of the present invention, the damper unit includes a plate-like holding member that is sandwiched between the plurality of film-like dampers and that defines a gap between the plurality of dampers. A speaker according to any one of the third aspects is provided.

According to the fifth aspect of the present invention, the film damper includes an outer peripheral portion disposed on an outer periphery of the yoke around the coupling portion,
The holding member is formed in a ring shape that is substantially the same shape as the outer peripheral portion, and provides a speaker according to a fourth aspect.

  According to the present invention, the conductive film damper provided on the outer peripheral surface of the voice coil bobbin and extending to the outer periphery of the yoke through the notch of the yoke can be used as a power supply line to the voice coil. The configuration can be facilitated. In addition, since the voice coil bobbin is supported at a total of three locations by the damper unit and the diaphragm, the vertical vibration stability of the voice coil bobbin can be improved, the magnetic gap can be reduced, and the efficiency of the magnetic field can be increased. The pressure level can be increased.

  According to the second aspect of the present invention, since the membrane damper is positioned at the upper and lower positions of the voice coil, an odd number of turns of the voice coil is possible, and the number of turns of the coil is smaller than that of the voice coil of the same height. This can increase the sound pressure level.

  According to the third aspect of the present invention, it is possible to provide a film-like damper that is not disconnected even by repeated vibrations, and it is possible to simplify the configuration of the voice coil.

  According to the fourth aspect of the present invention, the gaps between the plurality of membrane dampers can be easily defined, and the assembly of the damper unit can be facilitated. In addition, the connection between the holding member and the film damper can be facilitated by the outer peripheral portion configured in a shape along the holding member.

It is a perspective view which shows the external appearance structure of the speaker concerning embodiment of this invention. It is a perspective view which shows the state which removed the diaphragm of the speaker of FIG. It is a bottom view of the speaker of FIG. It is an assembly exploded view of the speaker of FIG. It is sectional drawing which shows the structure of the speaker of FIG. 1 typically. It is the elements on larger scale of FIG. It is a top view which shows the upper damper structure used for the speaker of FIG. It is an enlarged view which shows the arrangement | positioning state of the damper of the speaker of FIG. It is sectional drawing in the IX-IX line of FIG. It is a top view which shows the structure of the upper damper used for the speaker of other embodiment of this invention.

  Hereinafter, a speaker according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an external configuration of a speaker according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which the diaphragm of the speaker of FIG. 1 is removed. FIG. 3 is a bottom view of the speaker of FIG. FIG. 4 is an exploded view of the speaker of FIG.

  The speaker 1 of the present invention is a thin speaker mounted on a small electronic device, for example, particularly a thin television. The speaker 1 includes a flat bottomed cylindrical frame 2 as a housing, and a diaphragm 4 is provided in an upper opening portion of the frame 2. The diaphragm 4 vibrates and speaks when an electrical signal is sent from the lead wire 3 to a magnetic circuit built in the frame 2. The speaker according to this embodiment is a flat speaker in which the outer diameter of the frame 2 is approximately 6 cm and the thickness is approximately 8 mm.

  The diaphragm 4 is made of a plate member having a relatively high rigidity, and a synthetic resin, a honeycomb metal material, or the like can be used. In the present embodiment, the diaphragm 4 is made of a material in which aluminum and paper sheets are bonded to the surface of a honeycomb metal material, and has an outer diameter of about 4 cm.

  An edge 5 is attached to the periphery of the diaphragm 4, and the diaphragm 4 is connected to the frame 2 through the edge 5. As shown in FIG. 5, an upper frame 2 a is provided at the outer peripheral end of the edge 5, and the diaphragm 4 is fixed to the frame 2 by being fitted into an opening portion of the frame 2.

  The edge 5 is formed of a material having flexibility, and in the present embodiment, for example, foam rubber or the like is suitably used. By supporting the entire circumference of the diaphragm 4 with the flexible edge 5, the diaphragm 4 is supported so as to be able to vibrate vertically.

  Further, as shown in FIG. 5, a coil bobbin 6 having a circular cross section that substantially matches the outer diameter shape of the diaphragm 4 is provided on the back surface of the diaphragm 4. A voice coil 7 is wound around the outer peripheral surface of the side wall 6a of the track-shaped coil bobbin 6 to which the audio current is supplied.

  The coil bobbin 6 provided on the diaphragm 4 is an annular cylindrical body that substantially conforms to the outer frame shape of the diaphragm, and can be manufactured by press molding a light metal such as duralumin or aluminum, a heat-resistant resin film, or the like. . In this embodiment, an aluminum press-processed product having a large heat dissipation effect is used.

  The frame 2 is a bottomed container-shaped member having a bottom wall 21 and a side wall 22 and is made of a magnetic material. In this embodiment, steel with a thickness of 0.6 mm is used. In addition, the side wall etc. may be comprised with resin etc., if the flame | frame arrangement | positioning part 23 and the yoke which are mentioned later are comprised with the magnetic body material.

  The bottom wall 21 of the frame is formed with a magnet placement portion 23 for placing a magnet in the center. The magnet arrangement part 23 may be configured with slight unevenness so that a magnet unit to be described later can be positioned.

  The bottom wall 21 located around the magnet arrangement portion 23 is partially punched and functions as a vent. A yoke 24 described later is formed in a state of being erected on the upper side along the inner periphery of the punched portion.

  The side wall 22 is provided so as to rise from the bottom wall 21 to the upper side in the figure by bending the periphery. Flat portions 25 and 26 for attaching a later-described damper unit 8 and the upper frame 2a are provided in an intermediate portion of the side wall 22. The flat portion 25 is provided with a through hole 28 for drawing out the terminal pieces 13a and 14a of the upper and lower dampers 13 and 14 constituting the bumper unit 8 described later.

  As shown in FIG. 3, the bottom wall 21 of the frame is punched out at four locations, and a yoke 24 is formed so as to stand along the inner periphery of the punched hole 29. An interval between adjacent punching holes 29 can be set to about 1 to 3 mm, for example, and a notch 27 is formed between the yokes 24 at a position corresponding to a gap portion of the punching hole. In the example shown in FIG. 4, the punching holes are provided at four places and the yokes 24 are provided at four places. However, the present invention is not limited to this.

  Various members such as a magnetic circuit are housed in the frame 2 as shown in FIGS.

  Various members incorporated in the frame 2 are a magnet unit 9 composed of magnets 11 a and 11 b and a pole piece 12, a voice coil bobbin 6, a voice coil 7, and a bumper unit 8. As will be described later, the frame 2, the magnet unit 9, and the yoke 24 constitute a magnetic circuit.

  The magnets 11a and 11b used in the magnet unit 9 are disk-shaped permanent magnets. In the present embodiment, magnets having a diameter of 30 mm and a thickness of 1.4 mm are used as an example. As the type of magnet, an Nd—Fe—B rare earth magnet having large residual magnetization and coercive force and strong coercive force even in a small volume is used, but is not particularly limited, and may be a ferrite magnet. The rare earth magnet is an Nd—Fe—B type neodymium magnet or an Sm—Co type samarium cobalt magnet, which has a large maximum energy product (BH) max. In addition, the kind of magnet 11a, 11b is not specifically limited, An alnico magnet, a ferrite magnet, a neodymium magnet, a samarium cobalt magnet, etc. are used.

  As shown in FIGS. 5 and 6, the pole piece 12 is made of a magnetic material having a substantially H-shaped cross section with magnet arrangement concave portions on both surfaces. The magnet unit is configured by adhering the magnets 11a and 11b to the respective magnet arrangement recesses of the pole piece 12 so that the same poles face each other. The pole piece 12 is preferably made of the same material as the frame 2 constituting the yoke.

  By arranging the magnet unit 9 in the magnet arrangement part 23 of the frame 2 as described above, a magnetic gap G is formed between the yoke 24 and the magnet unit 9. In the present embodiment, the magnetic gap G is configured to be approximately 1.5 mm.

  A voice coil bobbin 6 and a voice coil 7 are arranged in the magnetic gap G. The voice coil 7 is formed in a cylindrical shape by winding an insulating conductor many times, and lead wires 7a and 7b are drawn from the upper and lower end positions. In this embodiment, the lead wires 7a and 7b are connected to a damper unit 8 to be described later, and the thin lead wire is configured to be very short, so that there is a problem of disconnection of the lead wire due to the vertical vibration of the voice coil. In addition, the number of parts to be assembled can be reduced.

  The damper unit 8 is fixed to the flat portion 25 of the side wall 22 of the frame 2. The damper unit 8 is connected to the voice coil bobbin 6 and the frame 2 and guides the diaphragm 2 to vibrate vertically.

  As shown in FIGS. 3 and 6, the damper unit 8 includes an upper damper 13, a lower damper 14, and a damper ring 15. The damper ring 15 is an annular member made of a synthetic resin, and is a member that supports the upper damper 13 and the lower damper 14 that are attached to the upper and lower surfaces of the damper ring 15 in a substantially parallel manner with a predetermined interval.

  On the lower surface of the damper ring, a notch 15a that fits into the flat portion 25 of the frame 2 is provided, and positioning with the frame 2 is possible.

  FIG. 7 is a plan view showing a configuration of an upper damper as an example of a damper. In the present embodiment, the upper damper 13 and the lower damper 14 are made by applying a copper coating on the surface of a polyimide resin film. Therefore, both the upper damper 13 and the lower damper 14 have conductivity. The upper damper 13 and the lower damper 14 have the same configuration except that the attachment positions of the terminal pieces 13a and 14a are different. Hereinafter, the configuration will be described taking the upper damper 13 as an example.

  As shown in FIG. 7, the damper can be displaced in the thickness direction by integrally fixing the fixed portion 31 located on the inner peripheral side, the connecting portion 33 extending radially from the fixed portion 31, and the fixed portion 31 and the connecting portion 33. And a circular outer peripheral portion 35 to be supported. Further, the outer peripheral portion 35 is provided with a terminal piece 13a.

  As shown in FIG. 8, the fixing portion 31 is affixed to the outer peripheral surface 6a of the voice coil bobbin 6, and its width dimension D is substantially the same as that of the voice coil 7 as shown in FIG. The fixed portion 31 is disposed in the magnetic gap G, and the yoke 24 is disposed on the outer peripheral side thereof. As described above, the notch 27 is provided between the adjacent yokes 24, and the connecting portion 33 is disposed in the notch.

  The connecting portion 33 is connected to the leg portion 32 that is a member that connects the fixing portion 31 and the outer peripheral portion 35, and further connects the outer peripheral portion 35 via the terminal portion 34. That is, as shown in FIG. 7, the connecting portion is supported in a doubly supported state by the leg portions 32 extending along the circumference outside the fixed portion 31 and connected to the outer peripheral portion 35.

  As shown in FIG. 8, the yoke 24 is disposed in a region 36 surrounded by the fixed portion 31 and the leg portion 32.

  The outer peripheral portion 35 is connected to the damper ring 15. Therefore, the upper and lower dampers 13 and 14 are elastically deformed with respect to the support surface of the damper ring so that the fixing portion 31 can move in the thickness direction.

  As shown in FIG. 9, the upper damper 13 and the lower damper 14 are connected to the voice coil bobbin 6 at the upper and lower positions of the voice coil 7 so as to sandwich the voice coil 7, and lead wires 7a and 7b of the voice coil 7, respectively. Concatenate with The lead wires 7a and 7b of the voice coil 7 can be connected to the upper damper 13 and the lower damper 14 by means such as spot welding.

  Since the upper damper 13 and the lower damper 14 are arranged with the voice coil 7 interposed therebetween, the voice coil 7 can set the lead-out position of the lead wire to the upper end and the lower end of the winding portion. As shown in FIG. 9, winding can be performed over odd layers. That is, in the conventional voice coil, since it is necessary to draw out the lead wires of both poles from the upper end or the lower end, the total number of windings is often an even number. However, according to the speaker of the present embodiment, the lead wires 7a and 7b can be drawn from both ends, and the upper damper 13 and the lower damper 14 are located very close to each other. It can be shortened and the problem of disconnection can be prevented.

  Further, the upper damper 13 and the lower damper 14 are provided. As described above, the terminal pieces 13 a and 14 a are drawn out of the frame through the through hole 28 and connected to the terminal plate 10.

  The terminal plate 10 provided on the outer peripheral portion 8 of the frame 2 is a member for electrically connecting the lead wire 3 and the lead wire 14a. The terminal piece 13a of the upper damper 13 and the terminal piece 14a of the lower damper connected to the lead wire 14a drawn from the voice coil 7 are fixed to the terminal plate 10 by soldering.

Since the lead wire 3 is connected to the terminal plate 10, the electrical signal supplied from the lead wire is supplied to the voice coil 7 through the upper damper 13 and the lower damper 14 via the terminal plate 10. The By adopting this configuration, the entire lead line of the voice coil vibrates together with the voice coil bobbin, so that disconnection of the lead line can be prevented and obstruction of vertical vibration caused by the lead line can be eliminated. That is, since the damper has a uniform configuration in the entire circumferential direction of the voice coil, it is easy to keep the vibration vertical.

  FIG. 10 is a plan view showing a configuration of an upper damper used in a speaker according to another embodiment of the present invention. As described above, the speaker according to the embodiment according to this modification has three yokes 24, and three connection portions 44 of the upper damper 43 corresponding to the notches of the yoke. is there.

  Further, the leg portion 42 that connects the fixed portion 41 and the outer peripheral portion 45 has a cantilever configuration so that the movement of the voice coil bobbin 6 is not hindered. Moreover, the clearance gap 46 provided between the fixing | fixed part 41 and the outer peripheral part 45 can be enlarged, and the contact with the yoke 24 and a damper can be prevented.

  The inner peripheral edge 42a of the leg portion 42 is configured to have a large curvature. As a result, the width of the gap 46 facing the yoke 29 is increased at the intermediate portion of the leg portion 42. Further, the width of the connecting part 44 and the terminal part 47 is configured to be larger than that of the leg part 42.

  The fixed portion 41 connected to the voice coil bobbin 6 is bent and displaced in the thickness direction of the damper by bending the leg portion 42, the connecting portion 44, and the terminal portion 47 due to the vibration of the voice coil bobbin 6. At this time, since the intermediate position of the leg portion 42 is inclined with respect to the thickness direction of the damper, the intermediate portion is shifted to the yoke side. The damper according to the present embodiment is configured such that the curvature of the inner peripheral side edge 42a of the leg portion 42 is large, so that the leg portion 42 configured to prevent the peripheral edge from coming into contact with the yoke and the narrow width is provided. By absorbing the twist, the bending fatigue applied to the connecting portion 44 and the terminal portion 47 can be reduced, and the breakage of the damper can be prevented.

  As described above, according to the speaker of the embodiment of the present invention, according to the present invention, the conductive material provided on the outer peripheral surface of the voice coil bobbin 6 and further extending through the notch 27 of the yoke 24 to the outer periphery of the yoke. A plurality of dampers can be used as a power supply line to the voice coil, and the configuration of routing the voice coil can be facilitated.

  Further, since the voice coil bobbin 6 is supported at a total of three locations by the damper unit 8 and the diaphragm 4, the vertical vibration stability of the voice coil bobbin is improved, the magnetic gap G is reduced, and the efficiency of the magnetic field is increased. Therefore, the sound pressure level can be increased.

  In addition, this invention is not limited to the said embodiment, It can implement in another various aspect. For example, the magnet unit is not limited to the above embodiment, and a configuration in which a pole piece is arranged on the upper surface of one magnet can be adopted.

  Further, the upper damper and the lower damper are not limited to the configuration of the above embodiment, and the material thereof is not only a copper plate but also a conductive material such as a synthetic resin film with printed wiring attached. it can.

  The speaker of the present invention can be used for a relatively small electronic device and can prevent breakage of the lead wire, thereby providing an electronic device with excellent durability.

DESCRIPTION OF SYMBOLS 1 Speaker 2 Frame 2a Upper frame 3 Lead wire 4 Diaphragm 5 Edge 6 Voice coil bobbin 7 Voice coil 8 Damper unit 9 Magnet unit 10 Terminal board 11a, 11b Magnet 12 Pole piece 13 Upper damper 13a Terminal piece 14 Lower damper 14a Terminal piece 15 Damper ring 21 Bottom wall 22 Side wall 23 Magnet arrangement part 24 Yoke 25, 26 Flat part 28 Through hole 31 Fixing part 32 Leg part 33 Connection part 34 Termination part 35 Outer part

Claims (5)

A magnetic circuit having a magnetic gap formed between a yoke and a magnet; a voice coil bobbin housed in the magnetic gap; a diaphragm supporting the voice coil bobbin; In a speaker having a frame to which a portion is attached and a damper unit that connects the voice coil bobbin and the frame,
The yoke is configured to partially have a notch extending in the vibration direction of the diaphragm,
In the damper unit, a plurality of conductive film dampers having a fixed portion fixed to the outer peripheral surface of the voice coil and a connecting portion arranged in the notch are arranged with a gap in the thickness direction. A speaker, characterized by   The speaker according to claim 1, wherein the film damper is connected to the voice coil bobbin so that a voice coil is disposed in the gap.   The film damper is formed of a metal-coated member on the surface of a synthetic resin film, the lead wire of the voice coil is connected to the fixing portion, and the connecting portion is connected to a wiring board. The speaker according to claim 1 or 2.   The damper unit according to any one of claims 1 to 3, wherein the damper unit includes a plate-like holding member that is sandwiched between the plurality of film-like dampers and that defines a gap between the plurality of dampers. Speaker. The film damper includes an outer peripheral portion disposed on an outer periphery of the yoke around the coupling portion,
The speaker according to claim 4, wherein the holding member is formed in a ring shape having substantially the same shape as the outer peripheral portion.

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