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JPS5351728

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DESCRIPTION JPS5351728
Description 1, title of the invention
Electro-acoustic transducer
r3, detailed description of the invention-. The invention relates to an electroacoustic transducer
constituted by two conductors and at least one diaphragm. In general, an electrodynamic speaker
is representative of an electroacoustic transducer. FIG. 1 shows a cross-sectional view of the
electrodynamic speaker. Reference numeral 1 denotes a field portion, and the field portion 1 is
constituted of a plate 3 provided with a center pole 2, a ring-shaped magnet 4, and a ring-shaped
upper plate 6 and a frame coupled to the field portion 1 The peripheral portion of the diaphragm
8 is fixed to the peripheral portion of the diaphragm b together with the gasket 7, and the voice
coil 10 fitted to the magnetic cap 9 of the field portion is coupled to the lower surface of the
central portion of the diaphragm 8 An intermediate portion of the voice coil 1 ░ is supported by
a damper 11, and a dust camp 12 is attached to the upper surface of the central portion of the
diaphragm 8 to constitute an electrodynamic speaker. In this electrodynamic speaker, by
applying a signal to the voice coil 10, the voice coil 1o performs a piston movement according to
the input signal, and the diaphragm 8 coupled to the voice coil 10 oscillates to emit sound.
EndPage : One is born. As described above, in the conventional speaker, the field portion 1 is
required in addition to the diaphragm, the shape is large, the total weight is large, and the cost is
remarkably disadvantageous. It is intended to eliminate the conventional drawbacks. An
embodiment of the present invention will be described below with reference to FIGS. 2 to 10 of
the accompanying drawings. In FIG. 2 and FIG. 3, reference numeral 13 denotes a diaphragm in
which the coil 15 is formed in a thin coil on a film insulating plate 14 made of synthetic resin or
the like, and 16 is a film insulating like film made of synthetic resin This diaphragm is a
diaphragm in which a thin coil 18 is formed on a plate 17, and the coils 15.18 are disposed with
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a fixed interval so as to be opposite to each other. The bias current is applied from the DC power
supply 19 and the coil 18 of the other diaphragm 16 can be made into any shape, not only a thin
coil, but the shape of the coil 16.18 1, such a configuration The operation of the electroacoustic
transducer of the present invention will be described with reference to FIGS. First, as shown in
FIG. 4, the coil 16.18 receives a force such that the IC is attracted to each other as shown by the
arrows in the coil 15.18, and if one diaphragm 13 is fixed, the other moving plate 16 is obtained.
In the case of vibration in the direction of the arrow, if both diaphragms 13.16 are not fixed,
either diaphragm 13.16 will vibrate in the direction of the arrow.
Next, as shown in FIG. 6, when the direction of the north current is reverse to that of FIG. 4, since
the direction 1 of the DC bias current is always constant, the forces acting on the coils 16.18
repel each other this time In such a direction, only the diaphragm 13.16 or 16 vibrates in the
opposite direction to the previous one to generate a sound. Subsequently, another embodiment
shown in FIGS. 6 to 7 will be described. Reference numeral 21 denotes a diaphragm made of a
synthetic resin such as polyethylene terephthalate. The diaphragm 21 is formed in a wave shape
and includes a plurality of fins 22. On the diaphragm 21, coils 23 for DC bias current and coils
24 for alternating current source current are alternately formed in the width direction of the
diaphragm 210 at every other portion of the dam 220. Of course, the DC power supply 26 is
connected to the DC bias current coil 23, and the source power supply 26 is connected to the
saw current coil 24. With such a configuration, a direct current bias current in a fixed direction is
applied to the direct current bias current coil 23, and an alternating current source current is
applied to the source current coil 24 as shown in FIGS. As shown, the air in the anchor 22 is
pushed in the arrow direction under the force in the arrow direction. Thus, the air in the fold 22
of the diaphragm 21 is indicated by the signal of the source power supply 26 in the vertical
downward direction of the drawing, and the mark indicates the vertical upward direction of the
drawing. Further, as shown in FIG. 10, the diaphragm 21 can be obtained by printing a coil 23.24
on a flat diaphragm 21 made of a film and forming it so as to have a large number of folds 22. it
can. The embodiment according to this embodiment is constituted by only one diaphragm 21 and
therefore has an advantage that the construction is simple and the manufacture is easy. As
described above, since the electro-acoustic transducer of the present invention is configured, it
can be simple and thin, can be thin, can be small in component parts, and can be large in size and
in any shape. It is a dog of industrial value, having many advantages such as being able to make a
significant advantage in cost.
4. Brief Description of the Drawings FIG. 1 is a half sectional view of an electrodynamic speaker
which is a typical example of a conventional electroacoustic transducer, and FIG. 2 is a
perspective view showing one embodiment of the electroacoustic transducer of the present
invention. Fig. 3 is the same schematic diagram, M4 Fig. 6 is the operation of the climate changer
EndPage: 2 explanatory drawing, Fig. 6 is a perspective view showing an electro-acoustic
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transducer according to another embodiment, Fig. 7 8 is a schematic diagram of the same, FIG. 8
and FIG. 9 are operation explanatory views of the same, and FIG. 10 is a developed view of the
diaphragm. 13.16, 21 ииииииии Diaphragm, 14.17 иии иии Insulating plate, 15.18 ииииииииииииииииииииииииииииииии DC
power supply, 20 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и Source
power supply, 22 и и и и и и и и и и и и и и coil for DC bias current, 24 и и и и и и и и и и и Name of agent Attorney
Nakao others 1 person 4 figure 5 figure 6 figure EndPage: ?
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