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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view showing a
conventional microphone, FIG. 2 is a perspective view showing the same output taking out
structure, FIG. 3 is a perspective view showing one embodiment of the present invention, FIG. 4 is
a perspective view of the same contracted state, and FIG. 5 is a cross-sectional perspective view
of the same part. 4.7, 10 · · · · · · Microphone element, 5, 8 ° 11 · · · · · · · · Piezoelectric polymer
film, · · · · ·
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
polymer transducer comprising a microphone, a speaker and the like. There is a linear array
microphone in which a plurality of microphones are linearly arrayed as microphones that collect
only a target sound without collecting ambient noise, and having extremely sharp directivity in
the direction perpendicular to the array axis. This linear array microphone can be manufactured
inexpensively by using the piezoelectric polymer film r1 film as a vibrating film , and is //
30'17δ2. That is, the vibrating film of the piezoelectric polymer film can be easily manufactured
to be long, and by bending it in an extremely long cylindrical or arc shape in the axial direction, it
is equivalent to continuously arranging a large number of microphone elements. It is possible to
obtain a very simple superdirective microphone. 1 and 2 show a conventional microphone of this
type, in which a ribbon-shaped piezoelectric polymer film 1 having piezoelectricity in the width
direction is held by the case 2 in an arc shape so as to be bent in the width direction and
vibrated. It forms a film. The output of the microphone is taken out of the electrodes 3 provided
on both sides of the piezoelectric polymer film 1 which is a vibrating film as shown in FIG. 2.
However, this conventional microphone has several tens of meters to 1 m to obtain sufficient
directivity. Because the length is long, its handling is very inconvenient, and its directivity is
determined by the length of the microphone, the directivity characteristics can not be changed,
and the characteristics are constant because they are always constant characteristics. There is a
drawback-one that can not be obtained. The present invention is intended to solve such a
conventional drawback easily, and one embodiment of the present invention will be described
below with reference to FIGS. 4 is a first microphone element holding a piezoelectric polymer
film 5 constituting a vibrating film by a cylindrical case 6, and 7 is a second microphone element
similarly holding a piezoelectric polymer film 8 by a case 9; A third microphone element 10
holds the piezoelectric polymer film 11 by a case 12. The diameters of the above-mentioned
cases 6.9.12 are different from each other, and they are concentrically combined and configured
to be extensible, and the base 13 is integrally provided at the lower end of the lowermost case 12
and the uppermost case A decoration 14 is attached to the upper end of 6. 6 shows a cross
section of one of the two microphones, for example, the first microphone element 4. The
piezoelectric polymer film 6 is positioned at the opening formed in the inner case 16 and the
periphery is Contact]-The case is attached, and the outside is covered with an outer case 4
provided with a sound collection hole 16vi.
Since the configuration is as described above, as shown in FIG. 3, even when the first microphone
element 4, the $ 2 microphone element 7, and the third microphone element 10 are expanded,
the state shown in FIG. As in the third microphone element 10 first. It can be used even when the
second microphone element 4.7 is accommodated, and when all the microphone elements jL and
7.10 are extended, an output can be obtained from each of them, and also, the first. When the
second microphone element 4.7 is accommodated, only the third microphone element 10
generates an output, and therefore the directivity can be changed as required. Although the
microphone has 24 digits in the embodiment, the same applies to the speaker. Since the present
invention can change the directional characteristics as described above, it can collect sound if it
is a microphone with characteristics as needed, and can emit sound if it is a speaker. It is easy to
handle because it can be carried around 5 and when not in use, so its practicality is great.