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2. Description of the Invention Electro-acoustic transducer 1, characterized in that the bimorph
of the organic piezoelectric film is accordion-shaped. 52. An electroacoustic transducer
characterized in that an accordion-like organic piezoelectric film bimorph is formed into a partial
electrode configuration, and each partial electrode is driven in parallel-series connection. 3. An
electro-acoustic transducer characterized in that a bimorph accordion 10-shaped organic
piezoelectric film bimorph having a partial electrode configuration is formed as a partial
electrode configuration, and a delay circuit is inserted between each partial electrode to drive.
Detailed Description of the Invention 15 The present invention relates to an electroacoustic
transducer using an organic piezoelectric film 0 Conventional electroacoustic transducers of this
type have widely used moving coil type speakers and the like. In contrast to this, organic
pressure in recent years! Headbons and tweeters made of film are made. These basic structures
are as shown in FIG. 1. Metals 12 and 13 are provided on both sides of an organic piezoelectric
film 511 by a method such as vapor deposition, and attached to a case 14 with a protective plate
15. , 13 are connected to the terminals 12 ', 13'. In the space surrounded by the organic
piezoelectric film 11 and the case 14, it is common to use a sound absorbing material 16 filled
with a sponge-like foam or GUNSU 10 fiber or the like. When applying such an electroacoustic
transducer of the conventional structure to a speaker etc., it is necessary to give a big
displacement to a line and the organic piezoelectric film of a large area. If the size of the
electroacoustic transducer is increased accordingly, there is a drawback in that it has to be driven
with high power. When the area is large, the organic piezoelectric film currently known has a
Young's modulus smaller than that of paper or the like by about 1 impact, so many natural
vibration modes 20EndPage: 1 are generated and good vibration characteristics can not be
obtained. There was a defect. Furthermore, since these organic piezoelectric materials are used as
thin films, they are capacitive. When the area is large, there is a drawback that it is difficult to
drive from this point too because of a very large capacitive load and system 5. The present
invention, except for the above-mentioned drawbacks, provides an electro-acoustic transducer
which can be compact and can be driven with low power. The first feature of the present
invention is to make the 1 ° organic piezoelectric film for electroacoustic conversion into a
bimorph configuration and further to provide this bimorph in an accordion manner, which is
smaller than the conventional configuration method described above with small power. Large
displacement can be obtained. It also makes it easier to obtain a frequency of more than 15 Hz in
bimorphon accordion, and thus also produces the effect of controlling the non-requirement
frequency. The second # of the present invention is similar to that of the second invention, in
which the drive electrodes are configured as partial electrodes and each partial electrode is
driven in parallel and series connection, and this configuration allows any impedance to be
generated. It becomes possible to adjust. The third feature of this development is that the
accordion-like organic piezoelectric film bimorph has a partial electrode configuration, and a
delay circuit is inserted between each of the five partial electrodes for driving, and the directivity
of the sound 4 radiation It is possible to adjust the sex freely (it has an effect of
The present invention has the features as described above and has great industrial value. A
detailed description will be given using the following embodiments. [Embodiment 1] FIG. 2 shows
an overview of an embodiment of the electroacoustic transducer according to the present
invention. In FIG. 0, 21 indicates a bimorph of an organic piezoelectric film 15 processed into an
accordion shape. Oshi, 22 is a panel board that supports it. FIG. 3 is an enlarged side view of FIG.
2, in which 31.32 is an organic piezoelectric film and 3 'and 35 are home electrode
films, respectively. In the form of a string, a stringer A / 7 is formed. The bimorph of this
embodiment is driven by applying an external electric field to terminals 33 'and 34'. Then, this
accordion-like bimorph is used to support and fix the accordion-like refractive portion of the
panel plate 36 with the adhesive 37 in a freely bending manner. A hole 39 is provided in the
cover plate, and a sound absorbing agent 38 is filled under the panel plate. Fig. 4 (a), 0))
schematically shows an example of the vibration mode of the bimorph of this embodiment, in
which 41.1043 shows a bimorph and 42 shows a panel. The same figure (a) according to the
phase of the alternating current electric field which carries out. 0) displacing as in 0) and
breathing as a whole will be. The arrow in the figure indicates the direction of the wave front to
be sent out 015 As mentioned above, this embodiment adopts an accordion-like bimorph
structure, and is small and acoustic as compared with the conventional electroacoustic apparatus.
A wide radiation area and a large displacement can be obtained. Furthermore, since the 20 (5) -th
natural vibration which is supported and fixed in a freely bending manner with the accordion-like
refracting portion can be taken higher as compared with the conventional product, the influence
by unnecessary vibration is small and high performance can be achieved. [Embodiment 2] FIG. 5
shows one embodiment concerning electrode connection at the time of driving, in which only the
electrode portions of the four bimorph elements of the electroacoustic transducer of the present
invention are taken out and shown. is there. In the figure, 501, 502 and 503 are the electrodes of
bimorph element 1, 504. 505. 506 are the electrodes of bimorph element 2, 507, 508 ° 509 are
the electrodes of bimorph element 3 and 510.10511.512 are bimorphs / l /. The electrodes of 7
elements 4 are shown respectively. The bimorph elements 1 and 2 and the bimorph elements 3
and 4 are respectively read in parallel, and these are further connected in series. Therefore, when
viewed from the drive terminals 513 and 514, the capacity as a total of 15 bodies is exactly the
same as in the case of one bimorph element.
By devising the connection method in this manner, the electroacoustic transducer of the present
invention can be adjusted to any impedance, such as preventing an increase in capacitive load.
20 (6) EndPage: 2 [Example 3] FIG. 6 also shows an example of a driving method, in which a
delay circuit 613 ° 614.615 is inserted between each bimorph element to drive. It is shown
taking out only 5 electrode parts of four pie 2 morph elements according to the figure. Similar to
the fifth section, 601 ° 602. 603, 604, 605, 606 ° 607. 608, 609, 610, 611 t 612 represent
the electrodes of each bimorph element. 616.617 indicates a driving electrode terminal. By
inserting a delay circuit between each bimorph in this manner, the directivity of the acoustic
radiation can be freely adjusted. As is apparent from the description given above using the
example of the above embodiment, according to the present invention, it is possible to provide an
electroacoustic transducer which can take a wide area of acoustic radiation 15 and have a large
displacement. In addition, the electroacoustic transducer of the present invention is composed of
a plurality of bifurcated elements, and-if the natural vibration is set higher compared to one
composed of a conventional piezoelectric film diaphragm 2可能 can be made, and as a result it is
less susceptible to unwanted vibration. Furthermore, if parallel-series connection is adopted as a
connection method of each bimorph element, the capacitive load can also be suppressed to a low
level, and driving becomes easy. Arbitrary directivity can be obtained by inserting a delay circuit
between each other bimorph element.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view schematically showing a schematic
structure for explaining the prior art. FIG. 2 is a view schematically showing a schematic
structure of a first embodiment of the present invention according to the present invention, and
FIG. 3 is a detailed view of the embodiment shown in FIG. It is the side view which showed the
structure typically. FIGS. 4 (a) and 4 (b) schematically show the vibration mode of the
embodiment shown in FIGS. 2 and 3. FIG. FIG. 5 is a schematic view for explaining the second
invention. FIG. 6 is a schematic view for explaining the third invention. Each symbol in the figure
indicates the following. 11: Piezoelectric film% 12.13: Metal electrode film. 12 ', 13' ... electrode
terminal, 14.15-... case, 16 ... sound absorbing material, 21 ... organic piezoelectric film bimorph,
22 ... panel plate, 31.32 ... organic Piezoelectric film, 33, 34, 35- · · · gold sbt polar farming, 33 '.
34 "... electrode terminal, 36 ... panel plate, 37 ... adhesive. 38 ... sound absorbing material, 39 ...
hole, 41, 43 ... organic piezoelectric film 46, 4502, 503, 504, 505t 506, 507. 508, 509, 510,
5111512 ... metal electrode film, 513, 514 ... electrode terminal. 601, 602t 603, 604, 605, 606,
607, 608. 609, 610, 611, 612 ... gold JiIK electrode film, 613, 614, 615 ... delay circuit, 616. 617
... electrode terminal. (9) Fig. 1 EndPage: 3
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jps55114099, description
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