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JPS5696800

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DESCRIPTION JPS5696800
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view and a plan view showing
an embodiment of a loudspeaker according to the present invention, and FIG. 2 is a plan view
showing another embodiment of the loudspeaker according to the present invention. -1 ...
diaphragm, 2 ... gasket, 3 ... frame, 4 ... coil, 5 ... lead wire, 6 ... terminal, 7 ... coil.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroacoustic
transducer. Conventionally, various systems such as an electrodynamic type and an electrostatic
type are known as loudspeakers, but methods other than the electrodynamic type generally have
small mechanical coupling and have difficulty in obtaining a large amplitude. Even in the case of
the electrodynamic type, it has various disadvantages. The major drawback is the occurrence of
distortion. As a general structure of the electrodynamic speaker, a voice coil 1-one knee i 96 ¥
00-rail is placed in the center of a cone paper (diaphragm), and voices are generated between
magnetic gaps formed by permanent magnets and poles. The coil is a structure that receives
stress, and cone paper itself has b with different modes of resonance frequency, so φ is
generated, and it is awkward to give vibration in a localized area (center of cone paper) It has
become. In addition, since the lead wire is taken out from the cone paper, the vibration of the
cone paper can be prevented, and it is necessary to narrow the magnetic gap in order to give
more efficiency. The burden of was very large. The present invention is intended to eliminate the
above-mentioned drawbacks and to provide a thin, low-distortion, yet simple-structured
loudspeaker without much loss of efficiency. Hereinafter, the present invention will be described
with reference to the drawings of the embodiments. FIG. 1 is a 1 ill l Ti view and a plan view
showing an embodiment of a speaker according to the present invention. The 114 diaphragm
corresponds to a cone. Reference numeral 2 is a gasket, 5 is a frame, 4 is a coil, 5 is a lead wire,
and 6 is a terminal mill 2-. Here, the moving plate 1 is a mixture of fine particles of a magnetic
material such as samarium cobalt or alnico, which is made of a rubber material or a resin
material. After forming the moving plate 1, magnetization is made in a direction perpendicular to
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the surface. Use the one that has been That is, the diaphragm 1 is configured as a thin permanent
magnet. A coil 4 is disposed close to the rear surface of the moving plate 1, and the coil 41 is
fixed to the frame 3. In this state, when the current is supplied to the coil 4 through the terminal
6, the moving plate 1 is vibrated by the magnetic flux of the coil 4. The periphery of the cutting
plate 1 is supported by the gasket 2 and the frame 3. By this configuration, the magnetic flux of
the coil 4 is received by the surface of the diaphragm 1 which receives the vibration, so that the
divided vibration is less likely to occur, so that the distortion of the sound is reduced. In addition,
since the lead can be made extremely thin quickly and the lead 4 is not in contact with the
diaphragm 1, it does not disturb the vibration. FIG. 2 shows another embodiment of the speaker
according to the present invention) 1 "f flat 111 · basic 3" configuration north "1 similar to the
key N but the coil 7 is composed of a plurality.
In the embodiment shown in FIG. 5, the number of coils 7 may be seven, and each coil 7 may be
connected in series or in parallel. Thus, the plurality of coils 7 causes the vibration 1iJ board 1 to
receive stress and vibrate on a surface closer to the omnidirectional direction than the
embodiment shown in FIG. 1 so that divided vibration hardly occurs and distortion is reduced.
The diaphragm shown in the embodiment of FIG. 1 and FIG. 2 has a structure that vibrates by
receiving all the core forces in the plane, so there is no need to increase the step size as in
ordinary cone paper, and it is relatively flexible. Therefore, the diaphragm itself can play the role
of a damper. Although 1 is omitted, it is possible to provide a loose material such as foamed
polyurethane or glass wool between the diaphragm and the frame. When the diaphragm has
some tiger rJ in the peripheral direction, the property m-j = improves. In addition, as shown in
Fig. 1 and Fig. 2, although 7 o · 1 o t coil with a 7 o · r core coil is not included,-the magnetic flux
of the coil is changed to the strength H and the impedance H ,! Ii conductive material is placed at
the center of the coil-even if it runs-and furthermore, the operation of Fig. 1 and Fig. 2 f1, good &
* & tdj & m &. 1.1. イ、オ。 However, the center of the diaphragm may be configured as an
N pole and the periphery as an S pole. As described above, according to the present invention,
since the diaphragm itself acts as a magnet and vibrates due to the magnetic flux generated from
the coil, the structure is simple, and no refinement is required. The mass production property is
good, the diaphragm has a point (44-like stress, so it is an orange <, it is a vibration that controls
the stress on the surface, so the occurrence of distortion due to the divided imaging motion of
the diaphragm is extremely small, and the damper It is also possible to provide a speaker that
can be configured to be extremely thin in structure without causing distortion due to the damper,
and the effect of
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