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JPS5359445

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DESCRIPTION JPS5359445
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional sealed
transducer, and FIG. 2 is a cross-sectional view of the sealed transducer of the present invention.
11 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · first
covering member, 13 · · · · · second covering member.
[Detailed description of the invention] The present invention relates to a writing type transducer
used in a self-contained water such as a sounding instrument, a fish finder, etc. Synthetic rubber
9 is covered in a liquid tight manner with a synthetic * 2 member consisting of synthetic wood
and further cork, foam in the fight with other materials other than the acoustic transmission /
reception surface l & of the piezoelectric electrostrictive element A rubber or other O-reflecting
layer J is provided, but the ridge distribution subject 111B # has a reflection of sound waves). b.
The acoustic impedance of water and #t are made of the same material so that they can be
radiated or received. The transmission and reception characteristics are good, but the noises of
the noise that propagates in the water from the image other than the transmission and reception
wavefront. Picking up and having troubles. According to the present invention, the covering
member of the piezoelectric electrostrictive element is divided into one, and one covering
member disposed on the sound wave transmitting / receiving surface side of the piezoelectric
electrostrictive element is made of a material which is disappointing to the acoustic impedance of
water. The other conventional devices disposed on the outer surface of the above are each made
of a foam material having innumerable closed cells K, thereby eliminating the above-mentioned
conventional defects and will be described with reference to FIG. In FIG. 1, ll is a circular plateshaped piezoelectric electrostrictive element in which silver electrodes // & and // l are applied
to both surfaces of barium titanate etc., and here the end face of the silver electrode // & side is
transmitted / received by sound. Become a face. / J ij The first half split covering member
comprising a large diameter inner face / core a for fixing the sound wave transmitting / receiving
surface tta @ KWj'15 of the piezoelectric electrostrictive element, synthetic rubber, synthetic
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resin, etc. The acoustic impedance of water such as is made of a prolific material. / J is disposed
on the other outer surface (the electrode / b end faces and the outward direction) except the
sound wave transmitting / receiving surface of the piezoelectric metal element, and the first halfsplit type fenced portion / white image lK aK A second half-shaped covering member that is
engaged in a liquid-tight manner by sealing the piezoelectric electrostrictive element // from
above, and is made of rubber, polyvinyl chloride resin, etc. To manufacture. Reference numeral
741F is a conduit which is integral with the covering member 13 projecting from the center /
part of the outer surface of the second seed layer 13 and which is a separate conduit, and which
is a separate member, both electrodes of the piezoelectric electrostrictive element // EL , And a
pair of leads-/ JEL and / jb connected to ノ / b are led out. Since the sealing panel transducer of
the present invention has the above-mentioned o: iao configuration and is covered with a foam
material having an infinite number of independent cells t1 other than the acoustic transmission
surface of the piezoelectric electrostrictive element in% The impedance does not pick up
rounding noise, which is extremely small compared to that of water, and it not only makes sure
to radiate or receive a sound wave on the sound wave transmitting / receiving surface (J), but
also its coating Since the air bubbles of the members are scattered independently, there is a great
advantage that it can be used in water without special waterproofing.
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