JP2006262249A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker used for various acoustic apparatuses which exhibits excellent frequency characteristics by solving the problem that frequency characteristics are disturbed by edge resonation and large dips are produced. <P>SOLUTION: The speaker is composed of a frame 6 to which a magnetic circuit 5 is coupled, a diaphragm 8 which is coupled around a voice coil 7 and whose periphery is coupled to the frame 6 through its first edge 8a and a diaphragm guide 9 whose inner circumference is coupled to the back surface of the diaphragm 8 and whose periphery is coupled to the frame 6 through its second edge 9b. A coupling part 9a of the inner circumference of the diaphragm guide 9 which is coupled to the back surface of the diaphragm 8 is arranged in a position inner than its contact points with the diaphragm 8 as an extension of the circumference surface of the diaphragm guide 9. In this manner, effects of resonation of the second edge 9b on the diaphragm 8 can be reduced and the speaker exhibiting excellent characteristics and producing no dips in its frequency characteristics can be obtained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker used for various audio equipment.

  FIG. 5 is a cross-sectional view showing the structure of this type of conventional speaker. In FIG. 5, 15 is a magnet, 16 is a plate, and 17 is a yoke. These are combined and joined as shown in FIG. A magnetic circuit 19 is formed in which an annular magnetic gap 18 is formed.

  Reference numeral 20 denotes a frame coupled around the magnetic circuit 19, and 21 denotes a voice coil movably fitted in a magnetic gap 18 formed in the magnetic circuit 19. Reference numeral 22 denotes a diaphragm. The diaphragm 22 has an inner peripheral portion bonded to the bobbin portion of the voice coil 21 and an outer periphery bonded to the outer periphery of the diaphragm 22 via a roll-shaped first edge 22a. It is bonded to the periphery of the frame 20.

  A suspension holder 23 is provided so as to guide the amplitude motion of the diaphragm 22. The suspension holder 23 has an inner peripheral portion at the inner periphery and the outer periphery of the rear surface of the diaphragm 22 on the magnetic circuit 19 side. Are bonded to the frame 20 via a roll-shaped second edge 23 a bonded to the outer periphery of the suspension holder 23. A dust cap 24 is adhered to the surface side of the diaphragm 22 so as to close the voice coil 21.

  The conventional speaker configured as described above has a configuration in which the suspension holder 23 is provided in place of the conventional damper, so that the voice coil 21 does not roll when moving, thereby reducing harmonic distortion and power of the speaker. The linearity can be improved and the performance of the speaker can be improved.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2004-336820 A

  However, in the above conventional speaker, the first edge 22a provided on the diaphragm 22 and the second edge 23a provided on the suspension holder 23 are substantially symmetrically similar to each other, thereby solving non-linearity and asymmetry. This reduces the harmonic distortion of the speaker and improves the power linearity, thereby improving the performance of the speaker. However, the frequency of the edge resonance generated at the first edge 22a and the second edge 23a are generated. Since the frequency of the edge resonance to be generated occurs at a frequency close to each other, the disturbance of the frequency characteristic due to the edge resonance generated at the second edge 23a is added to the disturbance of the frequency characteristic due to the edge resonance generated at the first edge 22a. As shown in Fig. 3, a large dip, which is a disturbance of edge resonance, appears in a wide frequency characteristic band, resulting in poor sound quality. There is a problem that is.

  This is because, even if the cross-sectional shapes of the first edge 22a and the second edge 23a are the same, the second edge 23a is actually more than the first edge 22a due to the attachment to the frame 20. This is because the outer peripheral diameter becomes small and the frequency at which edge resonance occurs is slightly higher.

  An object of the present invention is to solve such a conventional problem, and to provide a speaker with excellent performance in which a large dip due to disturbance of edge resonance does not occur in frequency characteristics.

  In order to solve the above-described problems, the present invention provides a frame in which a magnetic circuit having a magnetic gap is coupled, and a voice coil that fits in the magnetic gap, and the outer periphery of the frame is connected to the frame via a first edge. And a hollow conical shape in which an inner peripheral portion is coupled between an inner periphery and an outer periphery of a rear surface of the diaphragm, and an outer periphery is coupled to the frame via a second edge. In a speaker comprising a diaphragm guide, wherein the first edge and the second edge are substantially symmetrically similar, a coupling portion of an inner peripheral portion of the diaphragm guide coupled to the back surface of the diaphragm is arranged as a diaphragm guide. Is provided on the inner peripheral side with respect to the contact point with the diaphragm located on the extension of the outer peripheral surface of the hollow conical shape.

  As described above, in the speaker according to the present invention, the coupling portion of the diaphragm guide with the diaphragm is on the inner peripheral side with respect to the contact with the diaphragm located on the extension of the hollow conical outer peripheral surface forming the diaphragm guide. By providing a compliance between the end of the hollow conical outer peripheral surface forming the diaphragm guide and the coupling portion of the diaphragm, the compliance, the resonance frequency created from the diaphragm and the diaphragm guide are set. By making the frequency lower than the frequency of the edge resonance generated at the second edge, the influence of the edge resonance generated at the second edge on the diaphragm can be reduced, and as a result, the frequency characteristics are disturbed. It is possible to suppress the occurrence of a large dip.

(Embodiment 1)
Hereinafter, the invention described in the first to third aspects of the present invention will be described using the first embodiment.

  FIG. 1 is a cross-sectional view showing a configuration of a speaker according to Embodiment 1 of the present invention. In FIG. 1, 1 is a magnet, 2 is a plate, 3 is a yoke, and these are combined and combined as shown in FIG. Thus, a magnetic circuit 5 having an annular magnetic gap 4 is formed.

  Reference numeral 6 denotes a frame coupled around the magnetic circuit 5, and 7 denotes a voice coil that is movably fitted in a magnetic gap 4 formed in the magnetic circuit 5. Reference numeral 8 denotes a diaphragm. The diaphragm 8 has an inner peripheral portion bonded to the bobbin portion of the voice coil 7 and an outer periphery bonded to the outer periphery of the diaphragm 8 via a roll-shaped first edge 8a. It is bonded to the peripheral edge of the frame 6.

  A diaphragm guide 9 is formed in a hollow cone shape so as to guide the amplitude motion of the diaphragm 8, and an inner peripheral portion of the diaphragm guide 9 has a hollow cone that forms the diaphragm guide 9. A connecting portion 9a with the diaphragm 8 is provided on the inner circumference side of a contact point (point indicated by 8b in the drawing) with the diaphragm 8 positioned on the extension of the outer peripheral surface of the plate, and is bonded to the diaphragm 8. The portion is configured to be bonded to the frame 6 via a roll-shaped second edge 9 b bonded to the outer periphery of the diaphragm guide 9. Reference numeral 10 denotes a dust cap for dust protection adhered to the surface side of the diaphragm 8 so as to close the voice coil 7.

  The speaker according to the present embodiment configured as described above is coupled with the diaphragm 8 on the inner periphery of the diaphragm guide 9 provided to guide the amplitude motion of the diaphragm 8. The above-mentioned diaphragm guide has a configuration in which a coupling portion 9a for the diaphragm 8 is provided on the inner circumference side of the contact with the diaphragm 8 positioned on the extension of the outer peripheral surface of the hollow cone shape to be formed and bonded to the diaphragm 8. 9 can be relatively increased in compliance between the end of the hollow conical outer peripheral surface forming 9 (the point indicated by 9c in the figure) and the coupling portion 9a of the diaphragm 8, and is generated at the compliance portion. By setting the resonance frequency lower than the edge resonance frequency generated at the second edge 9b, the influence of the edge resonance generated at the second edge 9b on the diaphragm 8 can be reduced. To frequency characteristics In which a large dip can be prevented from generating by the disturbance suppression.

  The diaphragm 8 and the diaphragm guide are formed by applying edge paint as a dumping agent to a portion between the end of the hollow conical outer peripheral surface forming the diaphragm guide 9 and the coupling portion 9a of the diaphragm 8. 9 can adjust the sharpness of resonance generated by the relationship between the coupling portion 9 and the vibration plate 8 and the vibration plate guide 9 to realize a flat frequency characteristic.

(Embodiment 2)
Hereinafter, the second and second embodiments of the present invention will be described.

  In the present embodiment, the configuration of the diaphragm guide used in the speaker described in the first embodiment is partially different, and other configurations are the same as those in the first embodiment. The same reference numerals are given to the same parts, and detailed description thereof is omitted, and only different parts will be described below with reference to the drawings.

  FIG. 2 is a cross-sectional view showing a configuration of a speaker according to Embodiment 2 of the present invention. In FIG. 2, reference numeral 11 denotes a vibration formed in a hollow conical shape so as to guide the amplitude motion of the diaphragm 8. It is a board guide.

  The inner peripheral portion of the diaphragm guide 11 is on the inner peripheral side with respect to a contact point (point indicated by 8b in the drawing) with the diaphragm 8 located on the extension of the hollow conical outer peripheral surface forming the diaphragm guide 11. The connecting portion 11a to the vibration plate 8 is provided to be bonded to the vibration plate 8, and the outer peripheral portion is bonded to the frame 6 via a roll-shaped second edge 11c bonded to the outer periphery of the vibration plate guide 11. Although it is the same as that of the said Embodiment 1, in this Embodiment, the termination | terminus (point shown by 11d in a figure) of the hollow cone-shaped outer peripheral surface which forms the diaphragm guide 11, and the diaphragm 8 In this configuration, a corrugation type third edge 11b is provided between the coupling portions 11a.

  3 is a cross-sectional view showing another example of the speaker according to Embodiment 2 of the present invention. In FIG. 3, 12 is formed in a hollow conical shape so as to guide the amplitude motion of the diaphragm 8. It is a diaphragm guide provided.

  The inner peripheral portion of the diaphragm guide 12 is on the inner peripheral side with respect to the contact point (point indicated by 8b in the figure) with the diaphragm 8 located on the extension of the hollow conical outer peripheral surface forming the diaphragm guide 12. The connecting portion 12a with the diaphragm 8 is provided to be bonded to the diaphragm 8, and the outer peripheral portion is bonded to the frame 6 via the roll-shaped second edge 12c bonded to the outer periphery of the diaphragm guide 12. Although it is the same as that of the said Embodiment 1, in this Embodiment, the termination | terminus (point shown by 12d in a figure) of the hollow cone-shaped outer peripheral surface which forms the diaphragm guide 12, and the diaphragm 8 are the same. In this configuration, a roll-like third edge 12b is provided between the coupling portions 12a.

  The speaker according to the present embodiment shown in FIGS. 2 and 3 configured as described above has the resonance frequency generated at the third edges 11b and 12b as the second edge 11c, similarly to the speaker according to the first embodiment. , 12c lower than the frequency of the edge resonance generated at the second edge 11c, 12c, the influence of the edge resonance generated at the second edge 11c, 12c on the diaphragm 8 can be reduced. The disturbance can be suppressed so that a large dip does not occur.

  Furthermore, in the loudspeaker according to the present embodiment, the frequency of the edge resonance generated at the first edge 8a bonded to the outer periphery of the diaphragm 8 is changed by changing the shape and compliance of the third edges 11b and 12b. It becomes easy to match the resonance frequencies generated at the third edges 11b and 12b. By doing so, it becomes possible to cancel each other's resonance and eliminate the dip in the frequency characteristics. FIG. 4 shows the frequency characteristics of the speaker according to the present embodiment.

  As is clear from FIG. 4, the speaker according to the present embodiment can perform sound reproduction with excellent sound quality without dip in the frequency characteristics.

  The speaker according to the present invention has an effect that sound reproduction with excellent sound quality can be performed without a dip in frequency characteristics, and is particularly useful as a vehicle-mounted speaker or the like.

Sectional drawing which showed the structure of the speaker by Embodiment 1 of this invention Sectional drawing which showed the structure of the speaker by Embodiment 2 of this invention. Sectional drawing which showed the structure of the speaker by the other example The characteristic figure which showed the frequency characteristic of the speaker by Embodiment 2 of this invention Sectional view showing the structure of a conventional speaker Characteristic diagram showing frequency characteristics of the speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnet 2 Plate 3 Yoke 4 Magnetic gap 5 Magnetic circuit 6 Frame 7 Voice coil 8 Diaphragm 8a 1st edge 8b Contact with diaphragm 8, 9, 11, 12 Diaphragm guide 9a, 11a, 12a Joint part 9b, 11c , 12c Second edge 10 Dust cap 11b, 12b Third edge 11d, 12d End of outer peripheral surface

Claims (6)

A magnetic circuit having an annular magnetic gap, a frame coupled around the magnetic circuit, and a voice coil movably fitted in the magnetic gap are coupled to each other at the center, and the outer periphery is connected via the first edge. A diaphragm coupled to the periphery of the frame, and an inner periphery coupled to the inner periphery and the outer periphery of the back surface of the diaphragm on the magnetic circuit side, and the outer periphery to the frame via a second edge In a speaker comprising a coupled hollow conical diaphragm guide, the first edge and the second edge having a substantially symmetrical shape, the inner periphery of the diaphragm guide coupled to the back surface of the diaphragm The speaker which provided the coupling | bond part in the inner peripheral side rather than the contact with the diaphragm located on the extension of the hollow cone-shaped outer peripheral surface which forms a diaphragm guide. The resonance frequency generated by the compliance of the portion between the end of the hollow conical outer peripheral surface forming the diaphragm guide and the coupling portion of the diaphragm is made lower than the edge resonance frequency generated at the second edge. Item 2. The speaker according to Item 1. The speaker according to claim 1, wherein edge paint is applied to a portion between the end portion of the hollow conical outer peripheral surface forming the diaphragm guide and the coupling portion of the diaphragm. A third edge is provided between the coupling portion between the end of the hollow conical outer peripheral surface forming the diaphragm guide and the diaphragm, and the resonance frequency of the third edge is lower than the edge resonance frequency of the second edge. The speaker according to claim 1 configured as described above. The frequency of edge resonance generated by the first edge provided on the outer periphery of the diaphragm matches the frequency of resonance generated by the third edge provided on the inner periphery of the diaphragm guide. 4. The speaker according to 4. The speaker according to claim 4 or 5, wherein an edge paint is applied to the third edge.

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