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Description 1, title of the invention
Electro-mechanical converter
3. Detailed Description of the Invention The present invention relates to a flat electromechanical
transducer in which the efficiency of a vibration system is improved as much as possible.
Recently, a flat plate type '6 gas which can drive the entire vibrating surface uniformly as
compared to the conventional electro-mechanical converter, thereby enabling electro-mechanical
conversion by ideal perfect piston vibration. Mechanical transducers have been put to practical
use. That is, as shown in FIG. 1, this flat-plate electro-mechanical converter has a plurality of
small holes III and 121 and a pair of flat magnets II and 12 having a predetermined polarity, and
an insulator such as a synthetic resin film is interposed between them. A diaphragm U having a
predetermined coiled conductor pattern 132 as ZSZ is disposed. Then, while a magnetic field
such as a broken line shown in the drawing is acting by the magnet 11.12, the action force based
on Fleming's left-hand rule can be obtained by, for example, The conductor pattern I 32 is
generated to drive the entire diaphragm 13 so as to vibrate the piston by this force. However,
such a conventional flat-plate electro-acoustic transducer has a drawback that the efficiency of
the vibration system is poor because the additional mass by air acts largely on both sides of the
whole vibration system. Accordingly, the present invention has been made in view of the above
points, and it is an object of the present invention to provide a very good flat plate type electromechanical converter capable of simplifying and reliably removing the above-mentioned
conventional defects. . An embodiment of the present invention will now be described in detail
with reference to the drawings. EndPage: 1, as shown in FIG. 2, a pair of diaphragms zz, 23 are
disposed on both sides so as to cover one flat magnet 2I having different predetermined
polarities, and spacers at both ends thereof A flat plate type electro-mechanical converter is
assembled by combining 24.25. Here, the magnet 2Z has a plurality of small holes 211 drilled
with a predetermined gap, and is magnetized so that the polarities on both sides are
interchanged with each small hole 211 as a boundary. Further, the magnet 2I, the pair of
diaphragms 22.23 for covering the same, and the spacers 24.25 at both ends, the air chamber
26.27 formed with the magnet 21 as a boundary are the small holes 211 of the magnet 2Z. It is
connected by. The pair of diaphragms 22.23 is formed by forming a predetermined coiled
conductor pattern 222.232 with an insulator such as a synthetic resin film as a pace
The flat electromechanical transducer thus configured is magnetized so that the magnetic field of
the magnet 2I is directed in the direction of the arrow of the broken line, and the pair of
diaphragms 22,. In the case of a pair of diaphragms 22.23 for a while, as indicated by the flow of
a voice signal or the like having directivity as indicated by ▪ or · in the 23 conductor patterns y
222 * 232, the arrow direction of the solid line shown in the figure. Since the additional mass on
the inner side of the diaphragm 22.23, that is, on the inner side of the air chamber 26.27 can be
reduced as much as possible by vibrating in the same two directions so that It is possible to make
it extremely efficient.
Therefore, as described in detail above, according to the present invention, it is possible to
provide a novel and extremely good flat plate type electro-acoustic transducer which can
eliminate the conventional defects simply and reliably. Needless to say, the present invention is
not limited to the above-described embodiment, and various modifications can be made without
departing from the scope of the present invention.
4. Brief Description of the Drawings FIG. 1 is a side sectional view showing a conventional flat
plate type electro-mechanical converter, and FIG. 2 is a side cross section showing one
embodiment of a flat plate type electro-mechanical converter according to the present invention.
FIG. 21 ... Magnet 211 ... Small hole 22. 23 ... Diaphragm 24. 25 ... Spacer 26.21 ... Air chamber z
2 r, 231 ... Base 222. 232 ... Conductor pattern . Applicants Attorney Attorney Takehiko Suzue
Figure 1 Figure 2 EndPage: 2