JP3651481B2 - 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. 21, 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. The outer periphery of the magnetic gap 2 of the coil body 4 has a diaphragm 5 connected to the inner periphery thereof, and a frame 7 connected to the outer periphery of the diaphragm 5 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. 21, the inner periphery of the damper 8 is fixed between the voice coil part 3 of the voice coil body 4 and the inner periphery fixing part 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. 21, 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. 22 shows the power linearity of the 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. 23 shows the 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 diaphragm having an inner periphery connected to an outer portion of the magnetic gap, and a frame having an outer periphery connected to the diaphragm via a first edge. A suspension holder that substantially supports the voice coil is provided, and an outer peripheral portion of the suspension holder is connected to the frame via a second edge, and the first and second edges are the first and second edges. It is made into a substantially symmetrical similar shape with the boundary between the edges.

  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 the asymmetry of the suspension, and the first edge and the second edge. Since the edges of the antenna are arranged so as to cancel their own asymmetry, the nonlinearity and asymmetry of the suspension can be fundamentally selected, thereby reducing the harmonic distortion reduction and power linearity of the speaker. The performance of the speaker can be improved.

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

(Embodiment 1)
FIG. 1A shows a cross-sectional view of a speaker according to Embodiment 1 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 circle. The magnetic circuit includes a columnar pole 13 and concentrates the magnetic flux of the magnet 10 in the 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 according to the first embodiment of the present invention, 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 according to Embodiment 1 of the present invention. The larger the dynamic range of the output sound pressure and the 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 loudspeaker according to Embodiment 1 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 2)
Next, FIG. 4 will be described. FIG. 4 shows a cross-sectional view of the second embodiment, and components having the same configuration as those of the first embodiment are denoted by the same reference numerals. In FIG. 4, reference numeral 27 denotes a frustoconical suspension holder whose inner periphery is connected by a flat overlapping portion 27 </ b> A between the inner periphery and the outer periphery of the diaphragm 17, and the outer periphery has a second edge 21. Via the frame 19. For this reason, the suspension holder 27 can be significantly reduced in weight, and the sound conversion efficiency of the speaker itself can be improved.

(Embodiment 3)
Next, FIG. 5 will be described. FIG. 5 shows an enlarged cross-sectional view of the main part of the third 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 20 by an L-shaped planar overlapping portion 20B. As a result, the effect of dispersing the stress applied to the connecting portion between the suspension holder 20 and the second edge 21 is increased, so that the input resistance performance of the speaker can be further improved.

(Embodiment 4)
Next, FIG. 6 will be described. FIG. 6 shows an enlarged cross-sectional view of a main part of the fourth embodiment. In FIG. 6, the tip of the outer peripheral portion of the suspension holder 20 is obtained by extending the suspension holder 20 while bending the suspension holder 20 while the suspension holder 20 and the second edge 21 are connected 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 20 and the second edge 21 is further increased, so that the input resistance performance of the speaker can be further improved.

(Embodiment 5)
Next, FIG. 7 will be described. FIG. 7 shows an enlarged cross-sectional view of a main part of the fifth embodiment. In FIG. 7, the tip of the outer peripheral portion of the diaphragm 17 is extended while being bent in an L shape. Thereby, since the connection part of the diaphragm 17 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.

(Embodiment 6)
Next, FIG. 8 will be described. FIG. 8 shows a cross-sectional view of the sixth embodiment, and components having the same configurations as those of the first to fifth embodiments are denoted by the same reference numerals. In FIG. 8, corrugation is provided in a portion between the middle portion of the diaphragm 17 and the first edge 18. Thereby, since the rigidity of the diaphragm 17 is improved, the input resistance performance of the speaker can be further improved.

(Embodiment 7)
Next, FIG. 9 will be described. FIG. 9 shows a cross-sectional view of the seventh embodiment, and components having the same configurations as those of the first to sixth embodiments are denoted by the same reference numerals. In FIG. 9, the suspension holder 20 is made of a metal material having high thermal conductivity together with the bobbin of the voice coil body 15.

  Therefore, the heat generated by the voice coil body 15 can be efficiently radiated to the space via the bobbin of the voice coil body 15 and the suspension holder 20, and the temperature rise of the voice coil body 15 can be suppressed. For this reason, the adhesive strength of the voice coil body 15, the diaphragm 17, and the suspension holder 20 can be sufficiently ensured even with an adhesive whose adhesive strength is reduced at high temperatures, thereby improving the input resistance performance of the speaker. be able to.

(Embodiment 8)
Next, FIG. 10 will be described. FIG. 10 shows a cross-sectional view of the eighth embodiment, and the same reference numerals are attached to the same components as those of the first to seventh embodiments. In FIG. 10, the first edge 18 has a shape protruding in the opposite direction to the magnetic circuit 9, and the second edge 21 has a shape protruding toward the magnetic circuit 9.

  For this reason, even when the positional relationship between the first edge 18 and the second edge 21 is close, the movable contact between the first edge 18 and the second edge 21 can be avoided, so that the amplitude of the speaker The maximum sound pressure can be increased by increasing the margin.

(Embodiment 9)
Next, FIG. 11 will be described. FIG. 11 shows a cross-sectional view of the ninth embodiment, and components having the same configurations as those of the first to eighth embodiments are denoted by the same reference numerals. In FIG. 11, the first edge 29 has a shape protruding toward the magnetic circuit 9, and the second edge 30 has a shape protruding toward the diaphragm 17.

  For this reason, even when an acoustic opening such as a net is close to the front of the first edge 29, contact between the first edge 29 and the acoustic net can be avoided, so that an amplitude margin of the speaker is increased. The maximum sound pressure can be increased.

(Embodiment 10)
Next, FIG. 12 will be described. FIG. 12 is a cross-sectional view of the tenth embodiment. In FIG. 12, the elastic modulus of the first edge 18 and the second edge 21 are set to be approximately equal.

  For this reason, the first edge 18 and the second edge 21 can accurately cancel the nonlinearity and asymmetry of the first edge 18 and the second edge 21, and can greatly solve the nonlinearity and asymmetry of the suspension. The harmonic distortion and power linearity of the speaker device resulting from this can be greatly reduced.

(Embodiment 11)
Next, FIG. 13 will be described. FIG. 13 shows a sectional view of the eleventh embodiment. In FIG. 13, the first edge 18 and the second edge 21 are made of urethane.

  For this reason, even in the speaker according to the eleventh embodiment of the present invention having the first and second edges 18 and 21, the increase in the vibration system weight can be suppressed to a low level, and the efficiency reduction of the speaker accompanying the increase in the vibration system weight is suppressed to a low level. be able to.

(Embodiment 12)
Next, FIG. 14 will be described. FIG. 14 shows a sectional view of the twelfth embodiment. In FIG. 14, the suspension holder 20 is made of pulp.

  For this reason, it is possible to suppress the increase in the weight of the vibration system while securing the elastic modulus and the internal loss, and it is possible to suppress the decrease in the efficiency of the speaker accompanying the increase in the weight of the vibration system.

(Embodiment 13)
Next, FIG. 15 will be described. FIG. 15 shows a cross-sectional view of the thirteenth embodiment, and components having the same configurations as those of the first to twelfth embodiments are denoted by the same reference numerals. In FIG. 15, the suspension holder 20 is configured to be connected to the frame 19 via the second edge 21 with its outer peripheral end being closer to the magnetic circuit 9 side than the inner peripheral end of the frame 19.

  For this reason, the distance between the fulcrums of the first edge 18 and the second edge 21 can be made as large as possible, and the voice coil body 15 can be prevented from rolling when it is movable.

(Embodiment 14)
Next, FIG. 16 will be described. FIG. 16 shows a cross-sectional view of the fourteenth embodiment, and components having the same configurations as those of the first to thirteenth embodiments are denoted by the same reference numerals. In FIG. 16, a dustproof net 31 is attached between the voice coil body 15 and the frame 19.

  For this reason, it is possible to prevent dust and the like from entering the magnetic gap 14 of the magnetic circuit 9.

(Embodiment 15)
Next, FIG. 17 will be described. FIG. 17 is a view of the speaker according to the fifteenth embodiment as viewed from the back side, and components having the same configurations as those of the first to fourteenth embodiments are denoted by the same reference numerals. In FIG. 17, the inner end of the frame 19 is connected to the magnetic circuit 9, a vent hole 32 is provided on the inner end side (bottom surface side) of the frame 19, and a dustproof net 33 is provided on the vent hole 32 portion. .

  For this reason, it is possible to prevent dust and the like from entering the magnetic gap 14 of the magnetic circuit 9.

(Embodiment 16)
Next, FIG. 18 will be described. FIG. 18 shows a partially cutaway front view of the loudspeaker according to the sixteenth embodiment, and the same components as those in the first embodiment are given the same reference numerals. In FIG. 18, the suspension holder 20 is provided with an opening 34.

  For this reason, it can suppress that the acoustic output of the suspension holder 20 interferes with the diaphragm 17, and the acoustic characteristic of a speaker deteriorates.

(Embodiment 17)
Next, FIG. 19 will be described. FIG. 19 shows a partially cutaway front view of the seventeenth embodiment of the present invention, and the same components as those in the first to sixteenth embodiments have the same reference numerals. In FIG. 19, an opening 35 is provided in a portion between the first edge 18 and the second edge 21 of the frame 19. Therefore, it is possible to prevent the intermediate chamber from being formed by the diaphragm 17, the first edge 18, the frame 19, the second edge 21, the suspension holder 20, and the voice coil body 15. That is, by forming the intermediate chamber, it is possible to prevent the acoustic output of the suspension holder 20 from interfering with the diaphragm 17 to deteriorate the acoustic characteristics of the speaker.

(Embodiment 18)
Finally, FIG. 20 will be described. FIG. 20 is a cross-sectional view of the eighteenth embodiment, and the same reference numerals are given to the same components as those of the first to seventeenth embodiments. In FIG. 20, reference numeral 36 denotes a sealed box with a relatively small volume to which the speakers according to the first to 17th embodiments of the present invention are attached. . Therefore, even when used in a sealed box 36 having a relatively small volume, the suspension characteristics are matched by the air spring and the first edge 18 and the second edge 21 so that nonlinearity and asymmetry can be accurately determined. It can be canceled, and the harmonic distortion reduction and power linearity of the speaker can be improved.

  As described above, the present invention eliminates the damper that causes the nonlinearity and asymmetry of the suspension by configuring the suspension with the first edge and the second edge, and the first edge and the second edge. The edge is positioned to cancel its own asymmetry, so it can fundamentally resolve suspension non-linearity and asymmetry, resulting in reduced speaker harmonic distortion and improved power linearity. Thus, the performance of the speaker can be improved.

(A), (b) is sectional drawing of the speaker of Embodiment 1 of this invention, respectively. The characteristic view which shows the power linearity of the speaker of Embodiment 1 of this invention The characteristic view which shows the harmonic distortion characteristic of the speaker of Embodiment 1 of this invention Sectional drawing of the speaker of Embodiment 2 of this invention The principal part expanded sectional view of the speaker of Embodiment 3 of this invention. The principal part expanded sectional view of the speaker of Embodiment 4 of this invention. The principal part expanded sectional view of the speaker of Embodiment 5 of this invention. Sectional drawing of the speaker of Embodiment 6 of this invention Sectional drawing of the speaker of Embodiment 7 of this invention Sectional drawing of the speaker of Embodiment 8 of this invention Sectional drawing of the speaker of Embodiment 9 of this invention Sectional drawing of the speaker of Embodiment 10 of this invention. Sectional drawing of the speaker of Embodiment 11 of this invention Sectional drawing of the speaker of Embodiment 12 of this invention Sectional drawing of the speaker of Embodiment 13 of this invention Sectional drawing of the speaker of Embodiment 14 of this invention The rear view of the speaker of Embodiment 15 of this invention A partially cutaway front view of the speaker of the sixteenth embodiment of the present invention The partially cutaway front view of the speaker of Embodiment 17 of this invention Sectional drawing of the speaker of Embodiment 18 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 17, 26 Diaphragm 18, 29 1st edge 19 Frame 20, 27 Suspension holder 20A, 20B, 27A Plane superposition part 21, 30 Second edge 31, 33 Dust-proof net 32 Vent 34, 35 Opening

Claims (15)

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. And a suspension holder that substantially supports the voice coil on the magnetic circuit side of the diaphragm. The suspension holder includes a coupled diaphragm and an outer peripheral portion of the diaphragm coupled via a first edge. An outer peripheral portion of the suspension holder is connected to the frame through a second edge, and the first and second edges are substantially symmetrically shaped with the first and second edges as a boundary. Speaker. The speaker according to claim 1, wherein the inner peripheral portion of the suspension holder is connected to the magnetic circuit side from the inner peripheral connecting portion of the diaphragm of the voice coil. 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 3 or 4, wherein the elastic moduli of the first edge and the second edge are set substantially equal. The speaker according to claim 5, wherein the first edge and the second edge are made of urethane. The speaker according to claim 6, wherein the suspension holder is made of pulp. The speaker according to any one of claims 3 to 5, wherein an outer peripheral side of the suspension holder is connected to the frame via a second edge closer to the magnetic circuit than the inner end of the frame. 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. A diaphragm connected to the outer periphery of the diaphragm via a first edge; and the inner periphery of the suspension holder is connected to the middle of the diaphragm, and the outer periphery of the suspension holder is The speaker is connected to the frame via a second edge, and the first and second edges are substantially symmetrically shaped with the first and second edges as a boundary. The speaker according to claim 9, 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 9, 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 10 or 11, wherein the elastic modulus of the first edge and the second edge are set to be substantially equal. The speaker according to claim 12, wherein the first edge and the second edge are made of urethane. The speaker according to claim 12, wherein the suspension holder is made of pulp. The speaker according to any one of claims 10 to 12, wherein the outer peripheral side of the suspension holder is connected to the frame via a second edge on the magnetic circuit side from the inner end of the frame.

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