JP2008160364A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker reducing its distortion and improving a driving efficiency. <P>SOLUTION: This speaker is provided with: a frame 5; a diaphragm 3 having its outer peripheral side supported on the frame 5; a voice coil body 2 connected to the diaphragm 3; a magnetic circuit 1 wherein a voice coil 2b of the voice coil body 2 is disposed movably in a magnetic gap 8 thereof; and first and second edge bodies 7 which are supported on the frame 5 at two points with a predetermined interval of a portion closer to the magnetic gap 8 than a connection portion of the voice coil body 2 for the diaphragm 3. The edge bodies 7A and 7B have connection portions 7a and 7b having air permeability and heat resistance and edge portions 7c and 7d made of ring-shaped flexible materials connected to the connection portions 7a and 7b, and while one of the edge portions 7c and 7d of the first and second edge bodies 7A and 7B projects toward the diaphragm 3, the other projects toward the magnetic circuit 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a speaker.

  As shown in FIG. 2, in the conventional speaker, a voice coil body 2A movably disposed on a magnetic circuit 1A is connected to an inner peripheral end of a diaphragm 3A, and the outer peripheral end of the diaphragm 3A is connected via an edge 4A. It was connected to the frame 5A, and the back surface of the diaphragm 3A was connected to the frame 5A via the suspension holder 6A and the edge 7A.

  In addition, the distortion in the speaker is reduced by making the protruding shapes of the edges 4A and 7A in opposite directions and making the vertical amplitude of the diaphragm 3A vertically symmetric.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP 2004-7332 A

  Since the speaker shown in FIG. 2 uses the suspension holder 6A that firmly supports the diaphragm 3A, the weight increases, and it is not a problem for low-frequency sounds that add a large output. Since the weight is large, the driving efficiency becomes a problem.

  Accordingly, an object of the present invention is to further increase the driving efficiency in a low distortion speaker.

  In order to achieve this object, the present invention includes a frame, a diaphragm supported on the outer periphery of the frame, a voice coil body connected to the diaphragm, and a voice coil of the voice coil body. A first and second magnetic circuit arranged movably in the magnetic gap, and two points spaced from the diaphragm connecting portion of the voice coil body by a predetermined distance on the magnetic gap side are supported by the frame. Two edge bodies, and the first and second edge bodies include a connecting portion having air permeability and heat resistance, and an edge portion made of a flexible material in a ring shape connected to the connecting portion. And one of the edge portions of the first and second edge bodies protrudes toward the diaphragm and the other protrudes toward the magnetic circuit.

  With this configuration, the distortion of the speaker can be suppressed, and the driving efficiency can be improved by reducing the weight, which is appropriate for medium and high sounds.

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

  FIG. 1 is a cross-sectional view showing a speaker according to the present invention. A magnetic circuit 1 arranged at the center of the bottom of a mortar-shaped frame 5 includes a disk-shaped magnet 1a, a disk-shaped plate 1b, and a cylindrical yoke 1c. A cylindrical magnetic gap 8 opened toward the upper surface side of the magnetic circuit 1 is formed between the inner peripheral side surface of the side wall portion of the yoke 1c and the outer peripheral side surface of the plate 1b. .

  The voice coil body 2 has a structure in which a voice coil 2b is wound around an outer peripheral portion of a cylindrical main body 2a. The voice coil body 2b is arranged so as to move up and down with respect to the magnetic gap 8. Thus, the thin plate-like diaphragm 3 connected to the upper outer peripheral portion of the cylindrical body 2a of the voice coil body 2 is vibrated.

  A dust cap 9 is provided at the upper end portion of the cylindrical body 2a of the voice coil body 2 as a dust-proof measure.

  The diaphragm 3 is a part that becomes a sound source of the speaker, and is mainly made of pulp and resin having both high rigidity and internal loss, and the frame 5 through an edge 4 whose outer peripheral end protrudes upward. The inner peripheral end portion is connected and fixed to the outer peripheral side of the main body 2 a of the voice coil body 2. The edge 4 is formed of a material such as urethane, foam rubber, SBR rubber or cloth so as not to apply a movable load to the diaphragm 3.

  As shown in FIG. 1, the ring-shaped connecting portions 7a and 7b of the edge bodies 7A and 7B have an inner peripheral end portion on the outer peripheral side of the main body 2a of the voice coil body 2 and the magnetic circuit 1 rather than the fixed portion of the diaphragm 3. It is connected to a part at a predetermined interval on the side.

  Further, the outer peripheral end portions of the edge bodies 7A and 7B are connected to portions of the frame 5 at predetermined distances via ring-shaped edge portions 7c and 7d, respectively.

  The ring-shaped connecting portions 7a and 7b are made of a material such as cloth, which is consolidated into a corrugated ring structure. When the movable dimension of the voice coil body 2 is small, the ring-shaped connecting portions 7a and 7b are adapted to expand and contract following the downward movement. However, when the upper and lower movable dimensions of the voice coil body 2 are large, as will be described later, the ring-shaped edge portions 7c and 7d follow the upward and downward movements.

  Further, the ring-shaped connecting portions 7a and 7b are made of a material such as a cloth, which is hardened in a corrugated ring structure as described above. There is little load on the edge bodies 7A and 7B.

  Furthermore, since the ring-shaped connecting portions 7a and 7b are made of a material such as cloth, which is hardened in a corrugated ring structure as described above, the ring-shaped connecting portions 7a and 7b have heat resistance, and the heat generated by the voice coil 2b of the voice coil body 2 Of course, the ring-shaped edge portions 7c and 7d in which the ring-shaped connection portions 7a and 7b are interposed are not thermally deteriorated as well as the ring-shaped connection portions 7a and 7b.

  Now, when an audio signal is applied to the voice coil 2b of the voice coil body 2 in such a structure, the voice coil body 2 moves upward and downward by reacting with the magnetic field of the magnetic gap 8, and this movement causes the diaphragm to move. 3 vibrates and sounds are emitted from the speaker. In particular, the ring-shaped edge portions 7c and 7d are provided at the outer peripheral end portions of the ring-shaped connection portions 7a and 7b of the edge bodies 7A and 7B. For this reason, distortion of the speaker is suppressed, and the driving efficiency of the speaker is further increased.

  Conventionally, the ring-shaped edge portions 7c and 7d have both outer and outer ends connected to the frame 5 and the voice coil body 2 to suppress rolling when the voice coil body 2 is movable. In the form, in order to easily follow the movement of the voice coil body 2, the ring-shaped edge portion 7c protrudes in the direction of the diaphragm 3, and the ring-shaped edge portion 7d protrudes toward the magnetic circuit 1, and both ring-shaped edges are formed. Both the parts 7c and 7d have elasticity.

  That is, as described above, when a voice signal is applied to the voice coil 2b of the voice coil body 2, it reacts with the magnetic field of the magnetic gap 8 and the voice coil body 2 moves up and down. When the amplitude amount of 2 is small, the ring-shaped connecting portions 7a and 7b do not become a large load for moving the voice coil body 2, but as the amplitude amount of the voice coil body 2 increases, the ring-shaped connecting portions 7a and 7b 7a and 7b are smooth and load which hinders downward movement.

  Therefore, in the present embodiment, the outer peripheral portions of the ring-shaped connection portions 7a and 7b are connected to the frame 5 via the ring-shaped edge portions 7c and 7d, respectively, so that the voice coil body 2 can be moved. When the width is increased and the ring-shaped connecting portions 7a and 7b are loaded, stress is applied to the ring-shaped edge portions 7c and 7d, and the ring-shaped edge portions 7c and 7d are elastically deformed according to the stress. Become.

  For this reason, even when the amount of amplitude of the voice coil body 2 becomes large in this way, the presence of the ring-shaped edge portions 7c and 7d makes it difficult for the amplitude to be inhibited, and a decrease in drive efficiency is suppressed. Become.

  In the present embodiment, the voice coil body 2 is formed by two supports of the edge 4 and the edge bodies 7A and 7B (a combined body of the ring-shaped connection portions 7a and 7b and the ring-shaped edge portions 7c and 7d). Although supported in the upward and downward directions, in order to increase the driving efficiency of the diaphragm 3, the edge 4 is thinned to reduce its weight, thereby reducing the weight of the diaphragm 3 and the edge 4 Thus, the driving efficiency of the diaphragm 3 is increased.

  However, since the support strength of the voice coil body 2 is reduced when the edge 4 is thinned, the ring-shaped edge portions 7c and 7d of the edge bodies 7A and 7B are made thicker than the edge 4 accordingly. 2 is prevented from lowering the supporting strength. As a result, the elastic modulus of the edge bodies 7A and 7B (the combined body of the ring-shaped connecting portions 7a and 7b and the ring-shaped edge portions 7c and 7d) is larger (harder) than the elastic modulus of the edge 4.

  With the above configuration, the support of the voice coil body 2 is dominated by the support by the edge bodies 7A and 7B (the combined body of the ring-shaped connection portions 7a and 7b and the ring-shaped edge portions 7c and 7d). In order to suppress the distortion of the downward movement on the plate 3, the load on the edge bodies 7A and 7B (the combined body of the ring-shaped connecting portions 7a and 7b and the ring-shaped edge portions 7c and 7d) is as much as possible. There is a need to.

  Here, since the ring-shaped connecting portions 7a and 7b have only a small amplitude as described above, in order to make the lower load as high as possible on the ring-shaped edge portions 7c and 7d in the present embodiment, As described above, the ring-shaped edge portion 7c projects in the direction of the diaphragm 3, the ring-shaped edge portion 7d projects toward the magnetic circuit 1, and both the ring-shaped edge portions 7c and 7d have elasticity. That is, by making the protruding directions of the ring-shaped edge portions 7c and 7d substantially symmetrical with respect to each other, the upper and lower loads are made as similar as possible.

  Since the ring-shaped edge portions 7c and 7d are respectively connected to the portions of the steps 5a and 5b of the frame 5, the stability with respect to the connection is high.

  As described above, in the present embodiment, on the edge bodies 7A and 7B (a combination of the ring-shaped connection portions 7a and 7b and the ring-shaped edge portions 7c and 7d) substantially supporting the voice coil body 2, A major feature is that the underload is in the same state.

  Due to this feature, the upper and lower amplitudes of the diaphragm 3 are substantially symmetric upward and downward, so that distortion in the speaker can be reduced, and the edge 4 having a large area on the outer periphery of the diaphragm 3 is thin and lightweight. Therefore, it becomes a speaker with high driving efficiency even for medium and high sounds.

  INDUSTRIAL APPLICABILITY The present invention can reduce speaker distortion and drive efficiency in a speaker, and is particularly useful for a mid-high frequency speaker.

Sectional drawing of the speaker in one embodiment of this invention Cross-sectional view of a conventional speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnetic circuit 2 Voice coil body 2b Voice coil 3 Diaphragm 4 Edge 5 Frame 7A, 7B Edge body 7a, 7b Ring-shaped connection part 7c, 7d Ring-shaped edge part 8 Magnetic gap

Claims (3)

A frame, a diaphragm whose outer peripheral side is supported by the frame, a voice coil body connected to the diaphragm, and a magnetic circuit in which the voice coil of the voice coil body is movably disposed in the magnetic gap; The first and second edge bodies supported by the frame at two points spaced apart from the diaphragm connecting portion of the voice coil body by a predetermined gap on the magnetic gap side. The edge body has a connecting portion having air permeability and heat resistance, and an edge portion made of a flexible material in a ring shape connected to the connecting portion, and the edges of the first and second edge bodies One of the parts is a speaker that protrudes toward the diaphragm and the other protrudes toward the magnetic circuit. The connection parts of the first and second edge bodies are ring-shaped, and the inner circumferences of the connection parts of the first and second edge bodies are connected to the voice coil. The speaker according to claim 1, wherein the inner periphery of the edge portion of each of the first and second edge bodies is connected to the outer periphery of the connection portion, and the outer periphery of the edge portion of each of the first and second edge bodies is connected to a frame. . The connection part of the 1st, 2nd edge body was formed with the material which has air permeability, and the edge part of the 1st, 2nd edge body was formed with the rubber material or the synthetic resin material. Speaker.

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