JP2006261738A - Speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker capable of performing acoustic reproduction with excellent sound quality by solving the problem that the use of a circular voice coil causes split resonance, with respect to the speaker used for various types of sound equipment. <P>SOLUTION: The speaker has a configuration in which a voice coil 8 is formed by winding a coil around a bobbin, and a coupling portion of the bobbin with a diaphragm 7 is formed into a polygon. With this configuration, since a rate and a mode of vibration to be transmitted to the diaphragm 7 are different depending on places of the diaphragm 7, the split resonance can be prevented, flat sound pressure frequency characteristic can be realized and the sound reproduction with excellent sound quality can be performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a speaker used in various acoustic devices and information communication devices, and more particularly to a small and thin speaker suitable for a mobile phone or the like.

  Speakers used for various types of audio equipment and information communication equipment are becoming smaller and more compact than ever, especially in speakers used for mobile phones. Sound quality is also required, and such efforts are actively being made.

  4 (a) and 4 (b) are a plan view and a front sectional view showing the structure of this type of conventional speaker. In FIG. 4, 20 indicates a magnetic circuit, and this magnetic circuit 20 is a bowl-shaped yoke. The magnetic circuit 20 is formed by laminating and coupling a disk-shaped magnet 22 and a plate 23 in the inner part 21, thereby forming an annular magnetic gap 24.

  25 is a frame to which the magnetic circuit 20 is coupled, 26 is a voice coil that fits into a magnetic gap 24 formed in the magnetic circuit 20, 27 is a diaphragm coupled around the voice coil 26, and 27a is this vibration. It is an edge provided on the periphery of the plate 27, and the outer periphery of the edge 27 a is configured to be coupled to the frame 25. Reference numeral 28 denotes a cover provided to protect the diaphragm 27.

  The conventional speaker configured as described above is designed to be small and thin and slim to be mounted on a mobile phone or the like.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2003-134585 A

  However, in the above conventional speaker, since the annular voice coil 26 and the diaphragm 27 are concentric and similar in shape, the vibration velocity transmitted to the diaphragm 27 is constant everywhere on the diaphragm 27, and the vibration mode Therefore, there is a problem in that split resonance occurs in the vicinity of 5 to 10 kHz, sound pressure frequency characteristics are disturbed, and sound quality deteriorates.

  In order to solve this problem, proposals have been made to change the shape of the outer periphery of the diaphragm, or to partially change the thickness and density of a part of the diaphragm. There is a problem that it does not become a practical solution but also causes an increase in cost.

  An object of the present invention is to solve such a conventional problem and to provide a speaker capable of flattening sound pressure frequency characteristics by suppressing the occurrence of divided resonance and performing sound reproduction with excellent sound quality. It is.

  In order to solve the above problems, the present invention provides a magnetic circuit having a magnetic gap, a frame coupled with the magnetic circuit, and a vibration coupled with a voice coil having an outer periphery coupled to the frame and fitted into the magnetic gap. In the speaker composed of a plate, the voice coil is formed by winding a coil around a cylindrical bobbin, and the connecting portion of the bobbin with the diaphragm is polygonal.

  As described above, the speaker according to the present invention has a polygonal portion connected to the diaphragm of the bobbin of the cylindrical voice coil, so that the vibration speed and vibration mode transmitted to the diaphragm vary depending on the location of the diaphragm. As a result, it is possible to suppress the occurrence of split resonance, thereby achieving an effect of realizing sound reproduction with excellent sound quality by realizing flat sound pressure frequency characteristics. Is.

(Embodiment)
Hereinafter, the invention described in the entire claims of the present invention will be described by using embodiments.

  FIG. 1 is a cross-sectional view showing a configuration of a speaker according to an embodiment of the present invention. FIGS. 2A and 2B are a perspective view and a front view showing a voice coil used in the speaker.

  1 and 2, reference numeral 4 denotes a magnetic circuit. The magnetic circuit 4 is formed by stacking and coupling a magnet 1 and a plate 2 on the inner bottom surface of a yoke 3, thereby forming a magnetic gap 5. The circuit 4 is configured.

  6 is a frame to which the magnetic circuit 4 is coupled; 7 is a diaphragm having an outer periphery coupled to the frame 6; 8 is coupled to the center of the diaphragm 7 and a magnetic gap formed in the magnetic circuit 4; 5 is a voice coil fitted in the inside.

  As shown in detail in FIG. 2, the voice coil 8 includes a bobbin 8 a and a coil 8 b. The bobbin 8 a is formed in a cylindrical shape at the lower end around which the coil 8 b is wound, and is coupled to the diaphragm 7. The upper end is formed in a pentagon.

  FIGS. 3A and 3B are a plan view and a bottom view showing a state in which the voice coil 8 is coupled to the diaphragm 7. The diaphragm 7 is formed in a circular shape and the bobbin 8 a of the voice coil 8. Is formed in a pentagonal shape and coupled to the center of the diaphragm 7. With this configuration, the bobbin 8a of the voice coil 8 is formed in an odd-numbered square shape, so there is no symmetrical portion, and the voice coil Since the vibration velocity propagated from 8 is not constant everywhere on the diaphragm 7, the vibration modes are not the same.

  Therefore, since the occurrence of the division resonance can be eliminated, the deterioration of the sound quality caused by the disturbance of the sound pressure frequency characteristic is eliminated, and the sound reproduction with excellent sound quality can be performed.

  In addition, since the voice coil 8 can be configured with only the connecting portion of the voice coil 8 connected to the diaphragm 7 at the upper end of the bobbin 8a having a polygonal shape and the other portions remaining cylindrical, the voice coil 8 is fitted. Since the magnetic gap 5 of the magnetic circuit 4 to be inserted may have an annular configuration, a conventional magnetic circuit can be used as it is.

  Further, by providing R at each polygonal corner provided on the bobbin 8a of the voice coil 8, it is possible to suppress stress concentration and prevent the voice coil 8 and the diaphragm 7 from coming off. It is possible to provide a reliable speaker.

  Further, the polygonal angle provided on the bobbin 8a of the voice coil 8 eliminates the symmetrical part by making it an odd-numbered square, and a more excellent effect can be obtained. Is obtained. However, if the number of polygons is increased too much, the effect is reduced because it approaches a circular shape, which is not preferable.

  It is also possible to mold the bobbin 8a of the voice coil 8 and the diaphragm 7 so as to have an integral structure. By doing so, a great improvement effect can be expected in terms of dimensional accuracy, strength, and cost. It is.

  Further, in the present embodiment, an example using a circular diaphragm has been described, but the present invention is not limited to this, and the same applies even when a rectangular, elliptical, or track-shaped diaphragm is used. An effect is obtained.

  The speaker according to the present invention has the effect of suppressing the occurrence of divided resonance to improve the sound pressure frequency characteristics and performing sound reproduction with excellent sound quality, and is particularly small and thin suitable for mobile phones and the like. It is useful as a loudspeaker.

Sectional drawing which showed the structure of the speaker by one embodiment of this invention (A) The perspective view which showed the voice coil used for the speaker, (b) The front view (A) The top view which showed the state which couple | bonded the voice coil with the diaphragm, (b) The bottom view (A) A plan view showing the structure of a conventional speaker, (b) a sectional view of the same.

Explanation of symbols

1 Magnet 2 Plate 3 Yoke 4 Magnetic Circuit 5 Magnetic Gap 6 Frame 7 Diaphragm 8 Voice Coil 8a Bobbin 8b Coil

Claims (4)

A speaker comprising a magnetic circuit having a magnetic gap, a frame coupled with the magnetic circuit, and a diaphragm coupled with a voice coil having an outer periphery coupled to the frame and fitted into the magnetic gap. A speaker in which a coil is wound around a cylindrical bobbin and the connecting portion of the bobbin with a diaphragm is polygonal. The speaker according to claim 1, wherein a connecting portion of the voice coil bobbin with the diaphragm is an odd-numbered polygon. The speaker according to claim 1, wherein the outer periphery of the diaphragm is circular. The speaker according to claim 1, wherein the diaphragm and the bobbin of the voice coil are integrated.

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