JP2006261737A - 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 round voice coil causes split resonance with respect to the speaker used for various types of sound equipment. <P>SOLUTION: The voice coil 8 has a configuration of a polygon of a triangular or more. With this configuration, since a velocity and a mode of vibration to be propagated to a diaphragm 7 is different depending on a place of the diaphragm 7. Thus, the split resonance can be prevented, flat sound pressure frequency characteristic can be realized and the acoustic 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.

  FIGS. 5A and 5B are a plan view and a front sectional view showing the structure of this type of conventional speaker. In FIG. 5, reference numeral 20 denotes a magnetic circuit, and the 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, the annular voice coil 26 and the diaphragm 27 are concentric and similar in shape, so that the vibration speed transmitted to the diaphragm 27 is constant at any location on the diaphragm 27 and vibrates. Since the modes are the same, 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 so that it is not circular, or to partially change the thickness or density of a part of the diaphragm. However, these problems are not only drastic solutions, but also increase costs.

  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, a diaphragm having an outer periphery coupled to the frame and a voice coil corresponding to the magnetic gap. The voice coil has a configuration in which the voice coil has a triangular or more polygonal shape.

  As described above, the speaker according to the present invention has a polygonal shape of the voice coil, so that the vibration speed and vibration mode transmitted to the diaphragm are different depending on the location of the diaphragm. As a result, it is possible to obtain an effect of realizing a sound reproduction with excellent sound quality by realizing a flat sound pressure frequency characteristic.

(Embodiment 1)
Hereinafter, the invention described in the entire claims 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, and FIG. 2 is a plan view showing a state in which a voice coil used in the speaker is coupled to a diaphragm.

  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.

  Further, the diaphragm 7 is formed in a circular shape, and the voice coil 8 is formed in a pentagonal shape and coupled to the center of the diaphragm 7. With this configuration, the voice coil 8 is formed in an odd-numbered rectangular shape. Therefore, there is no symmetrical portion, and the vibration speed transmitted from the voice coil 8 to the diaphragm 7 is not constant everywhere on the diaphragm 7, so that 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.

  When such a polygonal voice coil 8 is used, it is desirable that the magnetic gap 5 formed in the magnetic circuit 4 also matches the shape of the voice coil 8, and the polygonal voice coil 8 By providing R at each corner of 8, stress concentration can be suppressed and the voice coil 8 and the diaphragm 7 can be prevented from coming off, so that a speaker with higher performance and high reliability can be provided. It will be.

(Embodiment 2)
Hereinafter, the second embodiment will be used to describe the invention described in the entire claims.

  In the present embodiment, the configuration of the voice coil of the speaker described in the first embodiment is different, and the other configurations are the same as those in the first embodiment. Reference numerals are assigned and detailed description thereof is omitted, and only different portions will be described below with reference to the drawings.

  3 (a), 3 (b) and FIGS. 4 (a), 4 (b) are plan views showing a state where the voice coil used in the speaker according to Embodiment 2 of the present invention is coupled to the diaphragm, FIG. 3 is a plan view showing a state in which the odd-numbered rectangular voice coil is coupled to the diaphragm. FIG. 3 (a) shows a triangle and FIG. 3 (b) shows a heptagon. 4 shows an even-numbered voice coil. FIG. 4A shows a quadrangle, and FIG. 4B shows a hexagon.

  In the speaker according to the present embodiment configured as described above, similarly to the speaker according to the first embodiment, the voice coil is configured to have a polygonal shape so that the vibration velocity transmitted from the voice coil to the diaphragm 7 is vibrated. Since the vibration mode is not the same because it is not constant everywhere on the plate 7, the occurrence of split resonance can be eliminated, so there is no deterioration in sound quality due to disturbance of the sound pressure frequency characteristics, and excellent It is possible to perform sound reproduction with high sound quality.

  Note that this effect can be obtained by making the voice coil shape an odd-numbered square so that there is no symmetric part, so that 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.

  In the present embodiment, the example using the circular diaphragm 7 has been described. However, the present invention is not limited to this, and the same applies even when a rectangular, elliptical, or track-shaped diaphragm is used. The effect of 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 Embodiment 1 of this invention The top view which showed the state which connected the voice coil used for the speaker to the diaphragm The top view which showed the state which couple | bonded the odd-numbered-shaped voice coil used for the speaker by Embodiment 2 of this invention with the diaphragm. The top view which showed the state which couple | bonded the even-numbered-shaped voice coil used for the speaker by Embodiment 2 of this invention with the diaphragm. (A) A plan view showing the structure of a conventional speaker, (b) a sectional view of the same.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Magnet 2 Plate 3 Yoke 4 Magnetic circuit 5 Magnetic gap 6 Frame 7 Diaphragm 8, 9, 10, 11, 12 Voice coil

Claims (5)

In a speaker comprising a magnetic circuit having a magnetic gap, a frame to which the magnetic circuit is coupled, and a diaphragm to which the outer periphery is coupled to the frame and a voice coil corresponding to the magnetic gap is coupled, the voice coil is connected to a triangle or more. A polygonal speaker. The speaker according to claim 1, wherein the polygonal voice coil has an odd number of corners. The speaker according to claim 1, wherein R is provided at each corner of the polygonal voice coil. The speaker according to claim 1, wherein the outer periphery of the diaphragm is circular. The speaker according to claim 1, wherein the shape of the magnetic gap formed in the magnetic circuit corresponds to the shape of the voice coil.

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