JP5278045B2 - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a speaker thin and high in performance. <P>SOLUTION: A magnetic circuit 11 having a magnetic gap 17 is installed on the reverse surface of a center part of a protector 18, a diaphragm 13 in an inverted cone shape is provided on the side of the magnetic circuit 11, and a suspension holder 15 is provided on the opposite side from the side of the magnetic circuit 11; and the diaphragm 13 is connected to a frame 19 through a first edge 14, and the suspension holder 15 is connected to the frame 19 through a second edge 16 respectively, those first and second edges 14 and 16 being substantially in symmetrical and analogous shapes with respect to a portion between those first and second edges. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a speaker.

  A conventional speaker has a configuration as shown in FIG.

  That is, as shown in FIG. 12, 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 is vibrated, and the vibration force is transmitted to the diaphragm 5, whereby the diaphragm 5 is configured to vibrate air and convert an electrical signal into sound.

As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.
JP-A-11-275690

  In the above conventional example, as shown in FIG. 12, 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, the damper 8 has a configuration in which a plurality of waveforms are combined as shown in FIG. 12 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, 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, the non-linearity and asymmetry of the movable load of the damper 8 are large, and the harmonic distortion caused by this is large. At the same time it occurred greatly, the power linearity was supposed to deteriorate.

  FIG. 13 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. 14 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. Accordingly, an object of the present invention is to provide a low-distortion high-performance speaker that can be thinned.

In order to achieve this object, the present invention provides a protector in which a magnetic circuit having a magnetic gap is installed on the back surface of the central part and an outer peripheral portion thereof is coupled to a frame, and at least the magnetic circuit in the magnetic gap of the magnetic circuit A voice coil body in which a coil part is movably provided, and a vibration in which an inner peripheral part is connected to an outer part of the magnetic gap of the voice coil body and an outer peripheral part is connected to the frame via a first edge. a plate, on the side opposite to the side of the magnetic circuit than the diaphragm, support the voice coil body substantially comprising a suspension holder coupled to the frame via the outer peripheral portion second edge, the suspension the inner peripheral portion of the holder is connected to the opposite side of the magnetic circuit side with respect to the connecting portion of the inner periphery of the diaphragm in the voice coil body, the first edge The voice coil body is coupled to the frame at a position above the magnetic circuit side of the diaphragm inner peripheral coupling portion, and the first and second edges are bordered by the first and second edges. In the speaker having a substantially symmetrical shape, the middle part between the inner periphery and the outer periphery of the suspension holder is coupled to the middle part of the diaphragm .

  As described above, in the present invention, a magnetic circuit having a magnetic gap is installed on the back surface of the central portion of the protector, the inner peripheral portion of the diaphragm is connected to the outer portion of the magnetic gap of the voice coil body, and the outer peripheral portion of the diaphragm is connected. By adopting a configuration in which the frame is connected to the frame via the first edge at a position above the magnetic circuit side, the thickness of the entire speaker can be reduced.

  In addition, by configuring the suspension with the first edge and the second edge, it is possible to eliminate the damper that causes the nonlinearity and asymmetry of the suspension, and the first edge and the second edge have their own. Since it is arranged so as to cancel the asymmetry, the nonlinearity and asymmetry of the suspension can be fundamentally solved, and the speaker performance is improved by reducing the harmonic distortion and power linearity caused by this. Can be improved.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view of a speaker according to Embodiment 1 of the present invention. In FIG. 1, a magnetic circuit 11 includes a disk-shaped magnet 11a, a disk-shaped plate 11b, and a circular concave yoke 11c. A magnetic gap 17 is formed between the outer periphery of the plate 11b and the inner periphery of the outer peripheral end of the yoke 11c. The magnetic flux of the magnet 11a is concentrated. The magnet 11a is mainly made of neodymium or rare earth cobalt, and the plate 11b and the yoke 11c are mainly made of iron. Although FIG. 1 shows an example of an inner magnet type, an outer magnet type magnetic circuit may be used. The magnetic circuit 11 is attached to the back surface of the central portion of the protector 18 using screws 21, and the outer peripheral portion of the protector 18 is coupled to the frame 19.

  The voice coil body 12 has a cylindrical shape, and at least a coil portion 12a is movably provided in a magnetic gap 17 of the magnetic circuit 11, and is generally a bobbin made of metal such as paper, resin, and aluminum. A coil such as a copper wire is wound on the top. A dust cap 20 is provided on the end surface of the voice coil body 12 opposite to the coil portion 12a.

The diaphragm 13 has an inverted conical shape connected to the outer part of the magnetic gap 17 of the voice coil body 12 and has an inverted conical shape. The diaphragm 13 actually emits sound by the vibration generated by the voice coil body 12. in, Pulse flops and resin achieves both high rigidity and internal loss is used as the main material. The diaphragm 13 is provided with an inverted conical outer peripheral portion on the magnetic circuit 11 side, and the outer peripheral portion of the diaphragm 13 is coupled to a frame 19 via a ring-shaped first edge 14. At this time, the first edge 14 is coupled to the frame 19 at a position above the inner peripheral coupling portion of the diaphragm 13 of the voice coil body 12 on the magnetic circuit 11 side.

  By setting the magnetic circuit 11 and the diaphragm 13 in such a position configuration, the thickness of the entire speaker can be significantly reduced.

  The first edge 14 is made of a material such as urethane, rubber or cloth so as not to apply a movable load to the diaphragm 13, and the frame 19 has a dish-like shape, and can cope with this complicated shape. Thus, materials such as iron plate press products, resin molded products, and aluminum die casts are used.

  The suspension holder 15 is provided on the side opposite to the magnetic circuit 11 side with respect to the diaphragm 13, and the inner peripheral portion thereof is on the side opposite to the magnetic circuit 11 side from the inner peripheral connecting portion of the diaphragm 13 of the voice coil body 12. Pulp and resin that are connected and have both high rigidity and internal loss are used as main materials.

  Further, the middle part between the inner circumference and the outer circumference of the suspension holder 15 is coupled to the middle part of the diaphragm 13 with an adhesive or the like. For this reason, the phase of the diaphragm 13 and the suspension holder 15 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 13 and the suspension holder 15. The characteristics can be flattened.

  The outer peripheral portion of the suspension holder 15 is coupled to the frame 19 via the second edge 16. Like the first edge 14, the second edge 16 is made of a material such as urethane, rubber, or cloth so as not to apply a movable load to the suspension holder 15. The second edge 16 is coupled to the frame 19 at the same or lower position opposite to the magnetic circuit 11 side than the inner peripheral connecting portion of the diaphragm 13 of the voice coil body 12.

  Here, the first edge 14 protrudes to the magnetic circuit 11 side, the second edge 16 protrudes to the side opposite to the magnetic circuit 11 side, and the boundary between the first and second edges 14 and 16 is the boundary. The shape is almost symmetrical.

  Next, the figure which looked at the protector 18 of FIG. 2 from the upper surface is shown. The protector 18 is made of a material such as an iron plate press product, a resin molded product, and an aluminum die cast so that it can cope with a complicated shape. In order to radiate sound toward the protector 18, this speaker is provided with punching holes 22 on the entire surface excluding the portion of the magnetic circuit 11 attached with screws 21 on the back surface of the center portion. The four corners of the protector 18 are provided with attachment holes 23 for attaching the speaker together with the frame 19 to which the protector 18 is attached.

  FIG. 3 shows a top view of a protector 18a of another embodiment. Similarly, in order to radiate sound to the protector 18a side, openings 25 are provided on the entire surface excluding the four beam 24 portions for supporting the magnetic circuit 11 attached to the center rear surface with screws 21. It is.

  Next, FIG. 4 shows an enlarged cross-sectional view of a joint portion between the second edge 16 and the suspension holder 15. Since the connecting portion of the second edge 16 to the suspension holder 15 is connected by the flat overlapping portion 15b, 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 15 and a second edge 16 is provided between the voice coil body 12 and the frame 19 in place of the conventional damper. The suspension holder 15 and the second edge 16 constitute a suspension together with the first edge 14 and are provided so as not to roll when the voice coil body 12 is movable.

  For this reason, a suspension can be comprised by the 1st edge 14 and the 2nd edge 16, and the damper used as the factor of the nonlinearity and asymmetry of a suspension can be excluded. Further, the first edge 14 and the second edge 16 have substantially symmetric similar shapes so as to cancel their own asymmetry. Specifically, the first edge 14 and the second edge 16 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, like the harmonic distortion characteristics of the speaker shown by D and E in FIG. 6, harmonic distortion caused by the nonlinearity and asymmetry of the suspension can be reduced, and the performance of the speaker can be improved.

  FIG. 5 is a characteristic diagram showing the power linearity of the speaker according to the first embodiment of the present invention, and shows the amplitude of the diaphragm 13 with respect to the input power. A is the input power to the magnetic circuit 11 side-diaphragm amplitude characteristics. B is an input power to the opposite side of the magnetic circuit 11 and a diaphragm amplitude characteristic.

  FIG. 6 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 electric signal output from an audio amplifier or the like to the coil portion 12a of the voice coil body 12, the voice coil body 12 is vibrated, the vibration force is transmitted to the diaphragm 13, and the diaphragm 13 is air. Is oscillated to convert the electrical signal into sound.

  Further, a suspension by a suspension holder 15 and a second edge 16 is provided between the voice coil body 12 and the frame 19 in place of the conventional damper. The suspension holder 15 and the second edge 16 constitute a suspension together with the first edge 14 and are provided so as not to roll when the voice coil body 12 is movable.

  For this reason, a suspension can be comprised by the 1st edge 14 and the 2nd edge 16, and the damper used as the factor of the nonlinearity and asymmetry of a suspension can be excluded. Further, the first edge 14 and the second edge 16 have substantially symmetric similar shapes so as to cancel their own asymmetry. Specifically, the first edge 14 and the second edge 16 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, like the harmonic distortion characteristics of the speaker shown by D and E in FIG. 6, harmonic distortion caused by the nonlinearity and asymmetry of the suspension can be reduced, and the performance of the speaker can be improved.

(Embodiment 2)
Next, FIG. 7 will be described. FIG. 7 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. 7, the suspension holder 26 has an arc shape, and the inner periphery thereof is connected to a lower position on the opposite side of the magnetic circuit 11 side than the inner periphery connection portion of the diaphragm 13 of the voice coil body 12. The outer periphery is connected to the frame 19 via the second edge 16. Thereby, the thickness of the whole speaker can be made thin. In addition, by constituting the suspension with the first edge 14 and the second edge 16, the damper that causes the nonlinearity and asymmetry of the suspension is eliminated, and the first edge 14, the second edge 16, and Since the diaphragm 13 and the suspension holder 26 are arranged so as to cancel each asymmetry, in addition to fundamentally solving the non-linearity and asymmetry of the suspension, the suspension holder 26 is also attached to the diaphragm 13. Therefore, it is possible to improve the speaker performance by reducing the harmonic distortion and power linearity of the speaker, and improving the flatness of the frequency characteristics in the mid-low range.

(Embodiment 3)
Next, FIG. 8 will be described. FIG. 8 shows a cross-sectional view of the third embodiment, and components having the same configuration as those of the first embodiment are denoted by the same reference numerals. In FIG. 8, the suspension holder 27 has a truncated cone shape in which the inner periphery is connected by a flat overlapping portion 27 a at the center between the inner periphery and the outer periphery of the diaphragm 13, and the outer periphery is the second edge 16. It is connected to the frame 19 via. Thereby, in addition to the effects described in the second embodiment, the suspension holder 27 can be significantly reduced in weight, and the acoustic conversion efficiency of the speaker itself can be improved.

(Embodiment 4)
Next, FIG. 9 will be described. FIG. 9 shows a cross-sectional view of the fourth embodiment, and components having the same configuration as those of the first embodiment are denoted by the same reference numerals. In FIG. 9, the first edge 28 has a shape protruding toward the side opposite to the magnetic circuit 11, and the second edge 29 has a shape protruding toward the diaphragm 13.

  For this reason, since it is possible to avoid contact with the bottom surface of the frame 18 adjacent to the protector 18 and the second edge 29 close to the front of the first edge 28, the thickness of the entire speaker is further reduced. Can do. When the thickness of the entire speaker is not changed, the maximum sound pressure can be increased by increasing the amplitude margin of the speaker.

(Embodiment 5)
Next, FIG. 10 will be described. FIG. 10 shows a cross-sectional view of the fifth embodiment, and components having the same configuration as those of the second embodiment are denoted by the same reference numerals. In FIG. 10, the first edge 28 has a shape protruding toward the side opposite to the magnetic circuit 11, and the second edge 29 has a shape protruding toward the diaphragm 13.

  For this reason, as in the fourth embodiment, it is possible to avoid contact with the bottom surface of the protector 18 that is in front of the first edge 28 and the frame 19 that is in proximity to the second edge 29. The overall thickness can be further reduced. When the thickness of the entire speaker is not changed, the maximum sound pressure can be increased by increasing the amplitude margin of the speaker.

(Embodiment 6)
Next, FIG. 11 will be described. FIG. 11 is a cross-sectional view of the sixth embodiment, and the same reference numerals are given to the same components as those of the third embodiment. In FIG. 11, the first edge 28 has a shape protruding toward the opposite side of the magnetic circuit 11, and the second edge 29 has a shape protruding toward the diaphragm 13.

  For this reason, as in the fourth embodiment, it is possible to avoid contact with the bottom surface of the protector 18 that is in front of the first edge 28 and the frame 19 that is in proximity to the second edge 29. The overall thickness can be further reduced. When the thickness of the entire speaker is not changed, the maximum sound pressure can be increased by increasing the amplitude margin of the speaker.

  As described above, according to the present invention, the thickness of the speaker can be reduced by installing the magnetic circuit having the magnetic gap on the back surface of the central portion of the protector and providing the inverted conical diaphragm on the magnetic circuit side. In addition, by configuring the suspension with the first edge and the second edge, the damper that causes the nonlinearity and asymmetry of the suspension is eliminated, and the first edge and the second edge are themselves asymmetric. Since the suspension is arranged so as to cancel out the suspension, the nonlinearity and asymmetry of the suspension can be fundamentally solved, and the speaker performance is improved by reducing the harmonic distortion and power linearity of the speaker. Can be improved.

Sectional drawing of the speaker of Embodiment 1 of this invention The top view of the protector of the speaker of Embodiment 1 of this invention The top view of the protector of the other Example of the speaker of Embodiment 1 of this invention The expanded sectional view of the connection part of the 2nd edge of the speaker of Embodiment 1 of this invention, and a suspension holder. 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 Sectional drawing of the speaker of Embodiment 3 of this invention Sectional drawing of the speaker of Embodiment 4 of this invention Sectional drawing of the speaker of Embodiment 5 of this invention Sectional drawing of the speaker of Embodiment 6 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

DESCRIPTION OF SYMBOLS 11 Magnetic circuit 12 Voice coil body 13 Diaphragm 14, 28 First edge 15, 26, 27 Suspension holder 16, 29 Second edge 17 Magnetic gap 18 Protector 19 Frame 20 Dust cap 21 Screw 22 Punching hole 23 Mounting hole 24 Beam 25 opening

Claims (7)

A protector in which a magnetic circuit having a magnetic gap is installed on the back surface of the central portion and an outer peripheral portion thereof is coupled to a frame; and a voice coil body in which at least the coil portion is movably provided in the magnetic gap of the magnetic circuit A diaphragm having an inner peripheral portion connected to an outer portion of the magnetic gap of the voice coil body, an outer peripheral portion being connected to the frame via a first edge, and the magnetic circuit side from the diaphragm. On the opposite side, a suspension holder that substantially supports the voice coil body and has an outer peripheral portion connected to the frame via a second edge is provided, and an inner peripheral portion of the suspension holder is the vibration in the voice coil body. is connected to the opposite side of the magnetic circuit side with respect to the connecting portion of the inner periphery of the plate, the first edge than the diaphragm inner connecting portion of the voice coil body The bonded to the frame at a position above the magnetic circuit side, the first, second edge, these first, in a speaker, a substantially symmetrical shape similar to the second edge as a boundary of said suspension holder The middle part between the inner circumference and the outer circumference is a speaker coupled to the middle part of the diaphragm . A protector in which a magnetic circuit having a magnetic gap is installed on the back surface of the central portion and an outer peripheral portion thereof is coupled to a frame; and a voice coil body in which at least the coil portion is movably provided in the magnetic gap of the magnetic circuit A diaphragm having an inner peripheral portion connected to an outer portion of the magnetic gap of the voice coil body, an outer peripheral portion being connected to the frame via a first edge, and the magnetic circuit side from the diaphragm. On the opposite side, a suspension holder that substantially supports the voice coil body and has an outer peripheral portion connected to the frame via a second edge is provided, and an inner peripheral portion of the suspension holder is the vibration in the voice coil body. It is connected to the opposite side of the magnetic circuit side with respect to the inner peripheral connecting part of the plate, and the first edge is from the inner peripheral connecting part of the diaphragm of the voice coil body The speaker is coupled to the frame at a position above the magnetic circuit side, and the first and second edges are substantially symmetrically shaped with the first and second edges as a boundary. Arc speaker . A protector in which a magnetic circuit having a magnetic gap is installed on the back surface of the central portion and an outer peripheral portion thereof is coupled to a frame; and a voice coil body in which at least the coil portion is movably provided in the magnetic gap of the magnetic circuit A diaphragm having an inner peripheral portion connected to an outer portion of the magnetic gap of the voice coil body, an outer peripheral portion being connected to the frame via a first edge, and the magnetic circuit side from the diaphragm. On the opposite side, a suspension holder that substantially supports the voice coil body and has an outer peripheral portion connected to the frame via a second edge is provided, and an inner peripheral portion of the suspension holder is the vibration in the voice coil body. It is connected to the opposite side of the magnetic circuit side with respect to the inner peripheral connecting portion of the plate, and the first edge is from the inner peripheral connecting portion of the voice coil body. The speaker is coupled to the frame at a position above the magnetic circuit side, and the first and second edges are substantially symmetrically shaped with the first and second edges as a boundary. A loudspeaker having a substantially symmetrical shape with the diaphragm. The speaker according to any one of claims 1 to 3, wherein the second edge is coupled to the frame at the same or lower position opposite to the magnetic circuit side than the diaphragm inner peripheral coupling portion of the voice coil body. The speaker according to any one of claims 1 to 3, wherein the first edge has a shape protruding toward the magnetic circuit, and the second edge protrudes in a direction opposite to the diaphragm side. The speaker according to any one of claims 1 to 3, wherein the first edge has a shape protruding toward a side opposite to the magnetic circuit side, and the second edge has a shape protruding toward the diaphragm side. The speaker according to any one of claims 1 to 3, wherein the elastic moduli of the first edge and the second edge are set substantially equal.

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