JP3651482B2 - Speaker - Google Patents

Description

  The present invention relates to a speaker.

  A conventional speaker has a configuration as shown in FIG.

  That is, as shown in FIG. 7, the speaker includes a magnetic circuit 1, a voice coil body 4 in which at least a coil portion 3 is movably provided in a magnetic gap 2 of the magnetic circuit 1, and the voice coil. The outer periphery of the magnetic gap 2 of the body 4 is provided with a diaphragm 5 whose inner periphery is connected, and a frame 7 whose outer periphery is connected via an edge 6.

That is, by inputting an electrical signal output from an audio amplifier or the like to the voice coil section 3 of the voice coil body 4, the voice coil body 4 vibrates, and the vibration force is transmitted to the diaphragm 5. 5 is configured to vibrate air and convert an electrical signal into sound (for example, Patent Document 1).
JP-A-11-275690

  In the above conventional example, as shown in FIG. 7, the inner periphery of the damper 8 is fixed between the voice coil portion 3 of the voice coil body 4 and the inner periphery fixing portion of the diaphragm 5, and the outer periphery of the damper 8 is a frame. 7 is fixed. The damper 8 forms a suspension together with the edge 6 so that the voice coil body 4 does not roll when it is movable. Further, as shown in FIG. 7, the damper 8 has a configuration in which a plurality of waveforms are combined so that the movable load of the voice coil body 4 is not as much as possible.

  However, in the recent high performance of speakers, the presence of this damper 8 causes a big problem.

  That is, the non-linearity and asymmetry of the movable load of the damper 8 are large in the behavior of the voice coil body 4 toward the magnetic circuit 1 and the behavior toward the opposite side of the magnetic circuit 1, and the harmonic distortion caused by this is large. At the same time it occurred, the power linearity was also going to deteriorate.

  FIG. 8 shows the power linearity of a conventional speaker and the displacement of the diaphragm 5 with respect to the speaker input power. A shows the amplitude characteristic of the diaphragm 5 toward the magnetic circuit 1, and B shows the amplitude characteristic of the diaphragm 5 in the direction opposite to the magnetic circuit 1. FIG. 9 shows harmonic distortion characteristics of a conventional speaker, where C is the frequency characteristic of the speaker, D is the second harmonic distortion characteristic, and E is the third harmonic distortion characteristic.

  In order to solve such problems of power linearity deterioration and harmonic distortion characteristics due to such non-linearity and asymmetry, each company has devised various ways to solve the non-linearity and asymmetry of the damper 8. However, as described above, the damper 8 is formed by combining a plurality of waveforms so as to reduce the movable load. Therefore, as long as the suspension is configured by combining the damper 8 and the edge 6, nonlinearity is achieved. It is difficult to reduce the harmonic distortion by solving the asymmetry and the present situation is that the performance of the speaker has not been improved. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to improve the performance of a speaker.

  In order to achieve this object, the present invention provides a magnetic circuit having a magnetic gap, a voice coil body in which at least a coil portion is movably provided in the magnetic gap of the magnetic circuit, and the voice coil body. A suspension holder whose inner periphery is connected to the outer part of the magnetic gap, a frame in which the outer periphery of the suspension holder is connected via a second edge, and an inner periphery connected to the middle part of the suspension holder. The outer periphery includes a diaphragm connected to the frame via a first edge, and the first and second edges have a substantially symmetrical similar shape between the first and second edges. Is.

  As described above, according to the present invention, the suspension is constituted by the first edge and the second edge, thereby eliminating the damper that causes the nonlinearity and asymmetry of the suspension, and the first edge and the second edge. By arranging the edges to cancel their own asymmetry, the nonlinearity and asymmetry of the suspension can be fundamentally solved, thereby reducing the harmonic distortion reduction and power linearity of the speaker. The performance of the speaker can be improved. In addition, since the inner periphery of the diaphragm is connected to the middle part of the suspension holder, the input resistance can be improved by increasing the amplitude stroke of the suspension holder and the magnetic circuit. Also, by connecting the inner periphery of the diaphragm to the middle part of the suspension holder, the acoustic conversion efficiency can be increased by reducing the weight of the vibration system.

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

(Example before the present invention)
FIG. 1A shows a cross-sectional view of the speaker of the previous example of the present invention. In FIG. 1A, 9 is a ring-shaped magnet 10, a ring-shaped plate 11, a disk-shaped yoke 12, and a column-shaped yoke. The magnetic circuit includes a pole 13, and the magnetic flux of the magnet 10 is concentrated in a magnetic gap 14 between the inner periphery of the plate 11 and the outer periphery of the pole 13. Ferrite and rare earth cobalt are used for the magnet 10, and iron is mainly used for the plate 11, the yoke 12 and the pole 13. Although FIG. 1 shows an example of an outer magnet type, an inner magnet type magnetic circuit is also widely used. Reference numeral 15 denotes a cylindrical voice coil body in which at least the coil portion 16 is movably provided in the magnetic gap 14 of the magnetic circuit 9. Generally, a bobbin made of a metal such as paper, resin, aluminum or the like is used. A coil such as a copper wire is wound on the top.

  Reference numeral 17 denotes an inverted conical diaphragm whose inner periphery is connected to the outer part of the magnetic gap of the voice coil body 15, which actually emits sound due to the vibration generated by the voice coil body 15. Pulp and resin having both rigidity and internal loss are mainly used. Reference numeral 18 denotes a ring-shaped first edge coupled to the outer periphery of the diaphragm 17, and materials such as urethane, rubber, and cloth are used so as not to apply a movable load to the diaphragm 17. Reference numeral 19 denotes a dish-like frame in which the outer periphery of the diaphragm 17 is connected via a first edge 18, and a material such as an iron plate press product, a resin molded product, and an aluminum die cast is used so as to cope with a complicated shape. Used.

  Reference numeral 20 denotes a suspension holder in which the inner periphery is connected to the magnetic circuit 9 side of the diaphragm 17 of the voice coil body 15, and pulp and resin having both high rigidity and internal loss are mainly used.

  Further, the middle part between the inner circumference and the outer circumference of the suspension holder 20 is coupled to the middle part of the diaphragm 17 with an adhesive or the like. For this reason, the phase of the diaphragm 17 and the suspension holder 20 becomes substantially the same phase, and it becomes possible to reduce the resonance distortion in the mid-low range due to the phase shift between the diaphragm 17 and the suspension holder 20. The characteristics can be flattened.

  Reference numeral 21 denotes a second edge for coupling the outer periphery of the suspension holder 20 to the frame 19. Like the first edge 18, materials such as urethane, rubber, and cloth are used so as not to apply a movable load to the suspension holder 20. . The first edge 18 protrudes in the opposite direction to the magnetic circuit 9 and the second edge 21 protrudes toward the magnetic circuit 9, but is substantially symmetrical with respect to the boundary between the first and second edges 18 and 21. It has a similar shape.

  Next, FIG. 1B shows an enlarged view of a connecting portion between the second edge 21 and the suspension holder 20. Since the connecting portion of the second edge 21 to the suspension holder 20 is connected by the planar overlapping portion 20A, the stress applied to the connecting portion can be dispersed, and the input resistance performance of the speaker can be further improved. .

  Further, a suspension by a suspension holder 20 and a second edge 21 is provided between the voice coil body 15 and the frame 19 in place of the conventional damper. The suspension holder 20 and the second edge 21 constitute a suspension together with the first edge 18 and are provided so as not to roll when the voice coil body 15 is movable.

  For this reason, a suspension can be comprised by the 1st edge 18 and the 2nd edge 21, and the damper used as the factor of the nonlinearity and asymmetry of a suspension can be excluded. Further, the first edge 18 and the second edge 21 have substantially symmetric similar shapes so as to cancel their own asymmetry. Specifically, the first edge 18 and the second edge 21 are opposed to each other so that the protruding directions are opposite to each other, whereby the power linearity input power-diaphragm amplitude shown by A and B in FIG. As the characteristics, the nonlinearity and asymmetry of the suspension can be fundamentally solved.

  For this reason, the harmonic distortion resulting from the nonlinearity and asymmetry of the suspension can be reduced as in the harmonic distortion characteristics of the loudspeaker indicated by D and E in FIG. 3, and the performance of the loudspeaker can be improved.

  FIG. 2 shows the power linearity of the speaker of FIG. 1 and shows the amplitude of the diaphragm 17 with respect to the input power. A is the input power to the magnetic circuit 9 side-diaphragm amplitude characteristics. B is the input power-diaphragm amplitude characteristic to the side opposite to the magnetic circuit 9.

  FIG. 3 shows the harmonic distortion characteristics of the loudspeaker of FIG. 1, and shows that the higher the dynamic range of output sound pressure and harmonic distortion, the smaller the harmonic distortion. C is a speaker characteristic, D is a second harmonic distortion characteristic, and E is a third harmonic distortion characteristic.

  The operation of the speaker of the previous example of the present invention configured as described above will be described below.

  By inputting an electrical signal output from an audio amplifier or the like to the coil portion 16 of the voice coil body 15, the voice coil body 15 is vibrated, the vibration force is transmitted to the diaphragm 17, and the diaphragm 17 is air. Is oscillated to convert the electrical signal into sound.

  Further, a suspension by a suspension holder 20 and a second edge 21 is provided between the voice coil body 15 and the frame 19 in place of the conventional damper. The suspension holder 20 and the second edge 21 constitute a suspension together with the first edge 18 and are provided so as not to roll when the voice coil body 15 is movable.

  For this reason, a suspension can be comprised by the 1st edge 18 and the 2nd edge 21, and the damper used as the factor of the nonlinearity and asymmetry of a suspension can be excluded. Further, the first edge 18 and the second edge 21 have substantially symmetric similar shapes so as to cancel their own asymmetry. Specifically, the first edge 18 and the second edge 21 are opposed to each other so that the protruding directions are opposite to each other, whereby the power linearity input power-diaphragm amplitude shown by A and B in FIG. As the characteristics, the nonlinearity and asymmetry of the suspension can be fundamentally solved.

  For this reason, the harmonic distortion resulting from the nonlinearity and asymmetry of the suspension can be reduced as in the harmonic distortion characteristics of the loudspeaker indicated by D and E in FIG. 3, and the performance of the loudspeaker can be improved.

(Embodiment 1)
Next, FIG. 4 will be described. FIG. 4 shows a cross-sectional view of the first embodiment of the present invention, and components having the same configuration as in FIG. That is, FIG. 4 is an improvement of FIG. 1 from the viewpoint of weight reduction. In FIG. 4, reference numeral 26 denotes an inverted frustoconical diaphragm whose inner periphery is connected by a flat overlapping portion 25 </ b> A between the inner periphery and the outer periphery of the suspension holder 25, and the outer periphery thereof is the first edge 18. It is connected to the frame 19 via. For this reason, the diaphragm 26 can be significantly reduced in weight, and the acoustic conversion efficiency of the speaker itself can be improved.

(Embodiment 2)
Next, FIG. 5 will be described. FIG. 5 shows an enlarged cross-sectional view of the main part of the second embodiment. In FIG. 5, the suspension holder 20 and the second edge 21 are connected to the front end of the outer peripheral portion of the suspension holder 25 by an L-shaped planar overlapping portion 20B. As a result, the effect of dispersing the stress applied to the connection portion between the suspension holder 25 and the second edge 21 is increased, so that the input resistance performance of the speaker can be further improved.

(Embodiment 3)
Next, FIG. 6 will be described. FIG. 6 shows an enlarged cross-sectional view of the main part of the third embodiment. In FIG. 6, the tip of the outer peripheral portion of the diaphragm 26 is extended while being bent in an L shape. Thereby, since the connection part of the diaphragm 26 and the 1st edge 18 is strengthened and the stress concerning this connection part can be disperse | distributed, the input-proof performance of a speaker can be improved more.

  As described above, according to the present invention, the suspension is constituted by the first edge and the second edge, thereby eliminating the damper that causes the nonlinearity and asymmetry of the suspension, and the first edge and the second edge. By arranging the edges to cancel their own asymmetry, the suspension nonlinearity and asymmetry can be fundamentally solved, resulting in reduced speaker harmonic distortion and improved power linearity. Thus, the performance of the speaker can be improved. In addition, since the inner periphery of the diaphragm is connected to the middle part of the suspension holder, the input resistance can be improved by increasing the amplitude stroke of the suspension holder and the magnetic circuit. Also, by connecting the inner periphery of the diaphragm to the middle part of the suspension holder, the acoustic conversion efficiency can be increased by reducing the weight of the diaphragm system.

(A), (b) is sectional drawing of the speaker which becomes an example before the present invention, respectively. Characteristic diagram showing power linearity of the speaker of FIG. Characteristic diagram showing harmonic distortion characteristics of the speaker of FIG. Sectional drawing of the speaker of Embodiment 1 of this invention The principal part expanded sectional view of the speaker of Embodiment 2 of this invention. The principal part expanded sectional view of the speaker of Embodiment 3 of this invention. Cross-sectional view of a conventional speaker Characteristics diagram showing the power linearity of a conventional speaker Characteristic diagram showing harmonic distortion characteristics of a conventional speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 Magnetic circuit 10 Magnet 11 Plate 12 Yoke 13 Pole 14 Magnetic gap 15 Voice coil body 16 Coil part 18 1st edge 19 Frame 21 2nd edge 25 Suspension holder 26 Diaphragm

Claims (6)

A magnetic circuit having a magnetic gap; a voice coil body in which at least a coil portion thereof is movably provided in the magnetic gap of the magnetic circuit; and an inner peripheral portion of the voice coil body at an outer portion of the magnetic gap. The connected suspension holder, the outer peripheral part of the suspension holder is connected to the frame connected via the second edge, and the inner periphery to the middle part of the suspension holder, and the outer periphery is connected to the intermediate part via the first edge. And a diaphragm connected to a frame, wherein the first and second edges are substantially symmetrically shaped with a boundary between the first and second edges as a boundary. The speaker according to claim 1, wherein the first edge has a shape protruding in a direction opposite to the magnetic circuit, and the second edge has a shape protruding toward the magnetic circuit. The speaker according to claim 1, wherein the first edge has a shape protruding toward the magnetic circuit, and the second edge has a shape protruding toward the diaphragm. The speaker according to claim 2 or 3, wherein the elastic modulus of the first edge and the second edge are set to be substantially equal. The speaker according to claim 4, wherein the first edge and the second edge are made of urethane. The speaker according to claim 4, wherein the suspension holder is made of pulp.

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