JP2009284064A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin "speaker" having large amplitude. <P>SOLUTION: In the speaker 100, an annular diaphragm 114 has an inner peripheral end and an outer peripheral end nearly equal in height, the outer peripheral end is fitted to a cylinder portion 112 constituting an annular support member, and the inner peripheral end is fitted to a voice coil bobbin 106. An annular damper 116 extends downward from the inner peripheral end to the outer peripheral end when the diaphragm 114 is stopped, and has its inner peripheral end fitted to the voice coil bobbin 106 and its inner peripheral end fitted to a projection portion 111 formed on a frame 110 constituting the support member to expand or contract as the diaphragm 114 vibrates. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker used in various audio apparatuses.

  The speaker vibrates the diaphragm with an amount of vibration corresponding to the voltage value of the acoustic signal flowing through the voice coil bobbin 106, and thereby emits sound by vibrating the surrounding air (see, for example, Patent Document 1).

  FIG. 6 is a cross-sectional view of a conventional speaker in an initial state (when the diaphragm is stopped). The speaker 200 shown in FIG. 6 includes a yoke 202, a magnet 203, a top plate 204, a voice coil bobbin 206, a voice coil 208, a frame 212, a diaphragm 214, a damper 216, and a dust cap 218.

  The yoke 202 has a convex portion at the center, and an annular magnet 203 is provided on the outer peripheral portion of the convex portion, and an annular top plate 204 is provided on the upper surface of the magnet 203. The yoke 202, the magnet 203, and the top plate 204 form a magnetic circuit. A cylindrical voice coil bobbin 206 serving as a vibration mechanism is arranged such that a voice coil 208 is wound around an outer periphery and the voice coil 208 is positioned between the convex portion of the yoke 202 and the top plate 204.

  The frame 212 is annular and has a lower end attached to the upper surface of the top plate 204. The diaphragm 214 has an annular shape and is inclined upward from the inner peripheral end toward the outer peripheral end, and the inner peripheral end is attached to the upper end portion of the voice coil bobbin 206. The diaphragm 214 has a support portion 214 a attached to the outer peripheral end, and the support portion 214 a is attached to the upper end portion of the frame 212. When the voice coil bobbin 206 vibrates in the vertical direction, the diaphragm 216 vibrates along with the vibration, and sounds are generated from the speaker 200 by vibrating the surrounding air.

The damper 216 has an annular shape and extends at substantially the same height from the inner peripheral end toward the outer peripheral end when the diaphragm 214 is stopped. The inner peripheral end is attached to a predetermined position of the voice coil bobbin 206, and The end is attached to the frame 212. The dust cap 218 has a bowl-like shape, and is provided on the diaphragm 216 so as to cover the inner opening of the diaphragm 216.
JP 2003-102091 A

  By the way, in particular, a speaker used in an audio device mounted on a vehicle is required to realize a large amplitude while being thinned due to a limitation of an installation space. However, in the above-described conventional speaker 200, the diaphragm 214 has a shape that is inclined upward from the inner peripheral end toward the outer peripheral end, which hinders thinning. Further, the outer peripheral end of the damper 216 is higher than the lower part of the frame 212, and the height thereof does not change when the diaphragm 214 vibrates. For this reason, if the diaphragm 214 is simply formed in a substantially horizontal shape, when the diaphragm 214 moves downward, the diaphragm 214 and the outer peripheral end of the damper 216 come into contact with each other, and the amplitude of the diaphragm 214 is reduced. A sufficient amount cannot be secured. That is, in the conventional speaker 200, it has been impossible to realize both thinning and large amplitude.

  The present invention has been made in view of the above-described circumstances, and provides a speaker that realizes both a reduction in thickness and an increase in amplitude.

  The speaker according to the present invention has an annular support member, an annular voice coil bobbin that vibrates up and down in accordance with the amplitude of an acoustic signal, and an annular shape, and the inner peripheral end and the outer peripheral end have substantially the same height. The outer peripheral end is attached to the support member, and the inner peripheral end is attached to the voice coil bobbin. The diaphragm is annular, and is inclined downward from the inner peripheral end toward the outer peripheral end when the diaphragm is stopped. The inner peripheral end is attached to the voice coil bobbin, and the outer peripheral end is attached to the support member, and has a damper that expands and contracts in response to vibration of the diaphragm.

  According to this configuration, the diaphragm is not shaped to incline upward from the inner peripheral end toward the outer peripheral end as in the prior art, but is formed such that the inner peripheral end and the outer peripheral end have substantially the same height. Therefore, the speaker can be made thin by reducing the vertical dimension. The damper extends from the inner peripheral end connected to the voice coil bobbin so as to incline downward toward the outer peripheral end connected to the support member and has a height when the diaphragm is stopped. The outer peripheral end where is constant is positioned below the conventional one. Therefore, the damper and the diaphragm are prevented from coming into contact with each other not only when the diaphragm moves upward due to the vibration of the voice coil bobbin but also when the diaphragm moves downward, and the amplitude of the diaphragm is ensured. be able to.

  In addition, the speaker according to the present invention may be attached to the support member and may have a protruding portion protruding upward to which the outer peripheral end of the damper is attached.

  According to this configuration, by attaching the outer peripheral end of the damper to the convex portion, it is possible to reliably prevent the portion other than the outer peripheral end of the damper from contacting the support member.

  From the same point of view, the speaker according to the present invention may be formed integrally with the support member and may have a convex portion protruding upward to which the outer peripheral end of the damper is attached.

  In the speaker according to the present invention, the diaphragm may have a shape that does not contact the convex portion during vibration.

  According to this configuration, by making the diaphragm not in contact with the convex portion during vibration, contact between the convex portion and the vibration plate when the diaphragm moves downward is prevented.

  In the speaker according to the present invention, the diaphragm may have a shape in which a portion directly above the convex portion protrudes upward.

  According to this configuration, by making the portion of the diaphragm substantially directly above the convex portion projecting upward, contact between the convex portion and the diaphragm when the diaphragm moves downward is prevented.

  In the speaker according to the present invention, the diaphragm may have a concave portion in which a portion directly above the convex portion opens downward.

  According to this configuration, the concave portion that opens downward is formed in the diaphragm directly above the convex portion, so that contact between the convex portion and the vibration plate when the diaphragm moves downward is prevented. .

  In the speaker according to the present invention, the diaphragm has a shape in which an outer peripheral portion protrudes downward, and the support member has a shape in which an outer peripheral portion protrudes downward.

  According to this configuration, by matching the outer peripheral shapes of the diaphragm and the support member, it is possible to prevent the diaphragm from contacting the support member when the diaphragm moves downward.

  According to the present invention, the diaphragm is formed so that the inner peripheral end and the outer peripheral end have substantially the same height, and the vertical dimension can be reduced to achieve a thinner speaker. Further, when the diaphragm is stopped, the damper extends so as to incline downward from the inner peripheral end toward the outer peripheral end, and the outer peripheral end whose height does not change is located below, so that the diaphragm is When moved downward, the damper and the diaphragm are prevented from coming into contact, and the amplitude of the diaphragm can be ensured.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a cross-sectional view of the speaker according to the embodiment of the present invention in an initial state (when the diaphragm 114 is stopped). A speaker 100 shown in FIG. 1 includes a yoke 102, a magnet 103, a top plate 104, a voice coil bobbin 106, a voice coil 108, a frame 112, a diaphragm 114, a damper 116, and a dust cap 118.

  The yoke 102 has a convex portion at the center, and an annular magnet 103 is provided on the outer peripheral portion of the convex portion. Further, an annular top plate 104 is provided on the magnet 103, and a frame 110 as a support member is provided on the top surface of the top plate 104. The top plate 104 is made of a magnetic material such as iron, and the frame 110 is made of a high-strength resin material such as engineering plastic. A convex portion 111 is attached to the upper surface of the frame 110. The protrusion 111 is made of a resin such as ABS that is not affected by the magnetism of the magnet 103, or a non-magnetic metal. The convex portion 111 may be formed integrally with the frame 110. A magnetic circuit is formed by the yoke 102, the magnet 103, the top plate 104, and the frame 110 described above.

  A cylindrical voice coil bobbin 106 serving as a vibration mechanism is arranged such that a voice coil 108 is wound around the outer periphery and the voice coil 108 is positioned between the convex portion of the yoke 102 and the top plate 104. With such an arrangement, the magnetic flux generated from the magnetic circuit formed by the yoke 102, the magnet 103, the top plate 104 and the frame 110 passes through the voice coil 108. The cylindrical portion 112 as a support member is made of a high-strength material such as iron or plastic. The cylindrical portion 112 has a lower end attached to the upper surface of the frame 110.

  The diaphragm 114 is attached to the upper end portion of the voice coil bobbin 106 at the inner peripheral end. One end of a support portion 114 a that is an elastic body is attached to the outer peripheral end of the diaphragm 114, and the other end of the support portion 114 a is attached to the upper end portion of the cylindrical portion 112. The diaphragm 114 is made of titanium, magnesium, ABS resin, or the like. The diaphragm 114 is annular and is formed so that the inner peripheral end and the outer peripheral end have substantially the same height. Furthermore, the diaphragm 114 has a central portion 114b that is directly above the projection 111 protruding upward so that the diaphragm 114 does not contact the projection 111 on the upper surface of the frame 110 when the diaphragm 114 moves downward. It has a shape. FIG. 2 is an external perspective view of the diaphragm 114 from above.

  The damper 116 is annular and extends so as to incline downward from the inner peripheral end toward the outer peripheral end when the diaphragm 114 is stopped. The damper 116 has an inner peripheral end attached to a predetermined position of the voice coil bobbin 106 and an outer peripheral end attached to the upper surface of the convex portion 111 formed on the frame 110.

  The dust cap 118 is made of a lightweight member that easily vibrates, such as pulp or carbon fiber. The dust cap 118 has a bowl-like shape, and is provided on the diaphragm 116 so as to cover the inner opening of the diaphragm 116.

  With such a structure, when an acoustic signal flows through the voice coil 108, the acoustic signal is generated by an electromagnetic action between the magnetic signal generated by the magnetic circuit including the yoke 102, the magnet 103, the top plate 104, and the frame 110 and the acoustic signal. Depending on the amplitude (voltage value), the voice coil bobbin 106 vibrates in the vertical direction (Z1-Z2 direction in FIG. 1). Further, as the voice coil bobbin 106 vibrates, the diaphragm 114 having the inner peripheral end attached to the upper end portion of the voice coil bobbin 106 vibrates in the vertical direction. When the diaphragm 114 vibrates in the vertical direction, ambient air vibrates, thereby generating sound from the speaker 100.

  3 and 4 are sectional views of the speaker 100 when the voice coil bobbin 106 and the diaphragm 114 vibrate. FIG. 3 shows a case where the voice coil bobbin 106 and the diaphragm 114 are moved upward, and FIG. A case where the diaphragm 114 moves downward is shown.

  In FIG. 3, the voice coil bobbin 106 moves upward, and accordingly, the diaphragm 114 moves upward. At this time, one end of the support portion 114 a having one end attached to the outer peripheral end of the vibration plate 114 and the other end attached to the upper end portion of the cylindrical portion 112 moves upward as the vibration plate 114 moves. In addition, the damper 116 attached to the predetermined position of the voice coil bobbin 106 at the inner peripheral end and attached to the upper surface of the convex portion 111 formed on the frame 110 has the inner peripheral end unchanged in height. The peripheral edge moves upward as the voice coil bobbin 106 moves. As a result, the damper 116 expands from the initial state shown in FIG. 1, and the angle at which the damper 116 is inclined downward from the inner peripheral end toward the outer peripheral end is increased.

  On the other hand, in FIG. 4, the voice coil bobbin 106 moves downward, and accordingly, the diaphragm 114 moves downward. At this time, one end of the support portion 114 a moves downward as the diaphragm 114 moves. Further, the damper 116 moves downward with the movement of the voice coil bobbin 106 while the height of the outer peripheral end is unchanged. As a result, the damper 116 is degenerated from the initial state shown in FIG. 1, and the angle at which the damper 116 is inclined downward from the inner peripheral end toward the outer peripheral end is reduced. When the diaphragm 114 moves downward as much as possible, the damper 116 becomes substantially horizontal from the inner peripheral end toward the outer peripheral end.

  As described above, in the speaker 100 of the present embodiment, the annular diaphragm 114 is attached to the cylindrical portion 112 whose inner peripheral end and outer peripheral end are substantially the same height, and whose outer peripheral end constitutes the annular support member. The inner peripheral end is attached to the voice coil bobbin 106, and it is not a shape that is inclined upward from the inner peripheral end toward the outer peripheral end as in the prior art, but the vertical dimension is reduced to make the speaker 100 thinner. It can be realized.

  The annular damper 116 extends from the inner peripheral end connected to the voice coil bobbin 106 so as to incline downward toward the outer peripheral end connected to the convex portion 111 when the diaphragm 114 is stopped. In addition, the outer peripheral end whose height is not changed is positioned on the convex portion 111 which is lower than the conventional one. Therefore, the damper 116 and the diaphragm 114 are prevented from coming into contact with each other not only when the diaphragm 114 moves upward due to the vibration of the voice coil bobbin 106 but also when the diaphragm 114 moves downward. The amount of amplitude can be secured.

  Further, by forming the convex portion 111 on the frame 110 and attaching the outer peripheral end of the damper 116 to the convex portion 111, the space between the damper 116 and the frame 110 is secured, and the portion other than the outer peripheral end of the damper 116 is Contact with the frame 110 can be reliably prevented. Further, by making the central portion 114b of the vibration plate 114 project upward, contact between the convex portion 111 and the vibration plate 114 when the vibration plate 114 moves downward is prevented.

  Note that the configuration of the speaker 100 is not limited to that shown in FIGS. FIG. 5 is a cross-sectional view of an initial state of another speaker according to the embodiment of the present invention. Compared with the speaker 100 shown in FIG. 1, the speaker 101 shown in FIG. 5 has a shape in which the outer peripheral portion 114c of the diaphragm 114 protrudes downward, and the outer peripheral portion 110a of the frame 110 constituting the support member protrudes downward. Shape.

  By adopting such a configuration, the diaphragm 114 and the outer periphery shape of the frame 110 are matched to prevent the diaphragm 114 from contacting the frame 110 when the diaphragm 114 moves downward.

  In the above-described embodiment, the central portion 114b of the diaphragm 114, which is substantially directly above the convex portion 111, has a shape protruding upward. However, when the diaphragm 114 is thick, the convex portion 111 is formed. You may make it have a recessed part opened below substantially on. Also in this case, when the vibration plate 114 moves downward, the contact between the convex portion 111 and the vibration plate 114 is prevented.

  As described above, the speaker according to the present invention can realize both thinning and large amplitude, and is useful as a speaker.

It is sectional drawing of the initial state of the speaker concerning embodiment of this invention. It is an external appearance perspective view from the upper part of a diaphragm. It is sectional drawing when the voice coil bobbin and diaphragm of the speaker concerning embodiment of this invention move upwards. It is sectional drawing when the voice coil bobbin and diaphragm of the speaker concerning embodiment of this invention move below. It is sectional drawing of the initial state of the other speaker concerning embodiment of this invention. It is sectional drawing of the initial state of the conventional speaker.

Explanation of symbols

100, 101 Speaker 102 Yoke 103 Magnet 104 Top plate 106 Voice coil bobbin 108 Voice coil 110 Frame 110a Frame outer peripheral part 111 Convex part 112 Cylindrical part 114 Diaphragm 114a Support part 114b Diaphragm central part 114c Diaphragm outer peripheral part 116 Damper 118 Dust cap

Claims (7)

An annular support member;
An annular voice coil bobbin that vibrates up and down according to the amplitude of the acoustic signal;
A diaphragm having an annular shape, an inner peripheral end and an outer peripheral end having substantially the same height, the outer peripheral end attached to the support member, and the inner peripheral end attached to the voice coil bobbin;
It is annular and extends so as to incline downward from the inner peripheral end toward the outer peripheral end when the diaphragm is stopped. The inner peripheral end is attached to the voice coil bobbin, and the outer peripheral end is the support member. And a damper that extends and contracts according to the vibration of the diaphragm.   The speaker according to claim 1, wherein the speaker has a convex portion that is attached to the support member and protrudes upward to which an outer peripheral end of the damper is attached.   The speaker according to claim 1, wherein the speaker has a convex portion that is integrally formed with the support member and protrudes upward to which an outer peripheral end of the damper is attached.   The speaker according to claim 2, wherein the diaphragm has a shape that does not contact the convex portion during vibration.   The speaker according to claim 2, wherein the diaphragm has a shape in which a substantially upper portion of the convex portion protrudes upward.   The speaker according to claim 2, wherein the diaphragm has a concave portion in which a portion directly above the convex portion opens downward. The diaphragm has a shape in which an outer peripheral portion projects downward,
The speaker according to claim 1, wherein the support member has a shape in which an outer peripheral portion protrudes downward.

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