JP2002262388A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker applicable to various video-audio devices with a high efficiency that hardly causes a defective magnetic gap. SOLUTION: In the speaker with a narrow width of this invention, a stiffness reinforcement section 28b made of a coil is provided to both side ends of a voice coil 28. Thus, production of defective magnetic gaps can be suppressed and the size of magnetic gaps 2a, 3a can be selected without taking into account deformation by an undesired resonance of the voice coil 28, then the high efficiency speaker can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker used for various audiovisual equipment, and more particularly to a loudspeaker having a narrow width.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 6 is a cross-sectional view of a conventional narrow-width so-called slim speaker in the short-diameter direction, and FIG.

According to FIG. 1, reference numerals 1a and 1b denote rectangular parallelepiped magnets which are magnetized in opposite directions. The upper plate 2 having an upper magnetic gap 2a is bonded and bonded, and the lower magnetic gap 3a is provided. The lower plate 3 is adhesively bonded to form a magnetic circuit 5.

Reference numeral 6 denotes a frame adhesively bonded to the upper plate 2. Reference numeral 7 denotes a vibration plate whose outer peripheral edge is adhesively bonded to the frame 6, and reference numeral 8 denotes a center of a short diameter of the vibration plate 7 in a long diameter direction. This is a planar voice coil in which the lower portion 8b is supported by a damper 10 which is inserted through the formed slit 7a, is adhered and fixed at the upper portion 8a, and is adhesively bonded to the lower plate 3 via a damper supporting portion 10a.

The voice coil 8 of the damper 10
, The coil portions 8c wound around the upper and lower coil wires of the voice coil 8 are located in the slit-shaped magnetic gap 2a of the upper plate 2 and the slit-shaped magnetic gap 3a of the lower plate 3, respectively. Are arranged as follows.

[0006] The formation of the coil portion 8c to the voice coil 8 has been to form fitted a spiral coil wire loop formed in the state of the air-core coil in the body of the voice coil 8.

[0007]

However, in the above-mentioned conventional speaker, since the voice coil 8 is driven vertically, the voice coil 8 and the magnetic circuit 5 come into contact with each other due to the undesired resonance of the voice coil 8. In order to prevent the occurrence of the gap failure and the high gap failure, the dimensions of the magnetic gaps 2a and 3a must be widened. As a result, the efficiency of the loudspeaker decreases due to the decrease in the magnetic flux density. in the input of market demand, it had been assumed to have the opposite problem of more high efficiency, improvement of the gap failure of the speaker.

An object of the present invention is to solve the above-mentioned problems and to provide a high-efficiency loudspeaker in which a gap defect is suppressed.

[0009]

According to a first aspect of the present invention, there is provided a planar voice coil in which rigid reinforcing portions are provided outside magnetic gaps at both ends. By providing the stiffening portions on both ends outside the magnetic gap, unnecessary resonance during driving of the voice coil is suppressed, and the stiffening portions can be set without affecting the gap size of the magnetic gap. By reducing the gap size by the effect of suppressing the resonance, the efficiency as a speaker can be improved.

[0010] The invention according to claim 2 of the present invention is obtained by forming a rigid reinforcement portion by the coil wire wheel of the voice coil of a speaker according to claim 1, of the speaker without increasing the number of parts high It is possible to improve efficiency.

[0011] The invention described in claim 3 of the present invention, opposite a plane perpendicular to the prismatic or cylindrical or voice coil rigidity reinforcing portion of both side ends of the voice coil of a speaker according to claim 1 or claim 2 The rigidity reinforcing portion can be formed extremely easily by forming an air-core coil or forming a voice coil.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a speaker according to the present invention will be described below with reference to FIGS. In the description, the same parts as those in the related art are denoted by the same reference numerals, and the description will be omitted.

FIG. 1 is a cross-sectional view of a slim speaker according to an embodiment of the present invention in a short diameter direction, and FIG. 2 is a perspective view of a planar voice coil which is a main part of the slim speaker. FIG. 3 is a perspective view of a planar voice coil as a main part of the development example, FIG. 4 is a perspective view of a planar voice coil as a main part of another development example, and FIG. It is a perspective view of a plane voice coil which is the important section of other development examples.

Only the differences from the prior art will be described with reference to the figure. Reference numeral 28b denotes a rigid reinforcing portion provided in a triangular prism shape on both ends of the voice coil. That is, a triangular prism-shaped rigid reinforcement portion is provided on both sides of the voice coil 28 at positions deviated from the magnetic gaps 2a and 3a provided in the magnetic circuit 5 by a coil wire in the same direction as the vibration direction of the voice coil 28. It is. This improves the rigidity of the voice coil 28, to suppress the lateral vibration caused by unnecessary resonance in driving the voice coil 28, thereby preventing the occurrence of the gap defect,
The magnetic gaps 2a and 3a can be narrowed to improve the efficiency as a speaker.

The rigidity reinforcing portion 28b may be formed only by a coil wire as in the present embodiment, or the shape of both ends of the main body of the voice coil 28 may be previously formed into a triangular prism shape (plastic molding). Also, the shape of the both ends of the main body of the voice coil 28 is previously formed in a triangular prism shape, and the both ends of the coil wire are formed in a triangular prism shape, and fitted into the main body of the voice coil 28. And may be formed integrally or may be integrally molded. In the following development examples of the voice coil, any of the above-described embodiments can be selected.

FIGS. 3 to 5 show development examples of a voice coil which is a main part of another embodiment.
FIG. 4 shows a rigid reinforcing portion 29b of the voice coil 29 having a cylindrical shape.
b is a quadrangular prism, and FIG.
A rigid reinforcing portion 31b is formed in an opposing planar shape orthogonal to 1.

With any of the above configurations, the rigidity can be reinforced, unnecessary resonance of the voice coil can be suppressed, the magnetic gap can be reduced to improve the efficiency of the speaker, and contribute to the reduction of gap defects. .

[0018]

As described above, the present invention makes it possible to provide a rigid reinforcing portion at both ends of a planar voice coil to suppress unnecessary resonance during driving and reduce the width of a magnetic gap. Higher efficiency as a speaker can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a slim speaker according to an embodiment of the present invention, taken along a minor axis.

FIG. 2 is a perspective view of a planar voice coil which is a main part of the same.

3 is a perspective view of a planar voice coil which is main part of the development example

FIG. 4 is a perspective view of a planar voice coil which is a main part of another development example.

FIG. 5 is a perspective view of a planar voice coil which is a main part of another development example.

6 is a cross-sectional view of the minor axis direction of a conventional narrow slim type speaker

FIG. 7 is a perspective view of a planar voice coil as the main part of the same.

[Explanation of symbols]

 2a, 3a Magnetic gap 5 Magnetic circuit 6 Frame 28, 29, 30, 31 Voice coil 28b, 29b, 30b, 31b Rigid reinforcement

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomoyasu Takase 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Masatoshi Okuyama 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. 5D012 BB05 FA04 GA01

Claims (3)

[Claims] 1. A magnetic circuit having a slit-shaped magnetic gap, a frame coupled to the magnetic circuit, a diaphragm having an outer peripheral edge coupled to the frame, and a magnetic plate coupled to the diaphragm and coupled to the magnetic plate. A speaker comprising a planar voice coil inserted into a magnetic gap of a circuit,
A speaker in which rigid reinforcing portions are provided in magnetic gaps at both ends of the planar voice coil. 2. The loudspeaker according to claim 1, wherein a rigid reinforcing portion is formed by coil wires at both ends of the planar voice coil. 3. The loudspeaker according to claim 1, wherein the rigid reinforcing portions on both side ends are formed in a prismatic shape, a cylindrical shape, or an opposing planar shape orthogonal to the voice coil.