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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an ultrasonic
transducer according to an embodiment of the present invention. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · (1) 183-
[Detailed description of the invention] This invention has a watertight structure because it is a
turtle related to a Langevin-type ultrasonic transducer that performs electric-air-acoustic
conversion and emits sound waves in the medium and receives sound waves in the mind medium
It is intended to provide a means for preventing the deterioration of the electrical insulation and
the adhesion of the imaging element due to the penetration of water into the interior of the
vibrator. Conventionally, since the root rubber part between the front mass and mounting plate
that make up the Langevin type ultrasonic imaging motor is soft b rubber etc. is used for the
purpose of vibration insulation, a medium such as water etc. When used continuously for a long
time, penetrate the root protection rubber with 1. The long-term use is problematic because it
infiltrates into the metal case and degrades the insulating plate and the adhesive. In order to
solve the above-mentioned drawbacks, this invention provides a pressure chamber between the
front mass and the metal case connected to it to fold the vibration element, and uses a control
valve to balance water pressure and case internal pressure. Therefore, the adjustment of the
internal pressure of the case is exclusively performed, and the detailed description of the present
invention will be described with reference to FIG. 0 which is not shown in an embodiment of the
present invention. Vibrating element bonded with adhesive 18), (3) rear mass, +41! 1. Antivibration rubber that performs the separation of the shooting movement between the front mass
(1) and the mounting plate (5), (6) is joined by 7 pieces of 7) to 7 pieces. ˜ Vibration element (2)
Au metal case covering the rear mass (3), (7α1 (7b) is an insulating plate interposed between
the vibration element (2) and the front and rear masses 111, 131 to provide both insulation (9 )
Are pressure elements provided between the vibrating element (2), the rear mass (3), the front
mass n +-anti-vibration rubber (4), the mounting plate (5) and the metal case (6) The pressure
transducer is a pressure regulating valve that regulates the pressure in the pressure chamber.
The ultrasonic transducer configured in this way measures the water pressure in that portion of
the pressure chamber (9) when the installation location is predetermined. A medium such as
water is prevented from permeating the anti-vibration rubber (4) by performing adjustment
using the adjusting valve ill to maintain the internal pressure by the hydraulic pressure or
slightly higher. Can be used in mediums such as water for a long time Todo element (2) - the
deterioration of the adhesive (8) does not live. As described above, in the ultrasonic transducer
constituted by the ultrasonic transducer constituted by the above-mentioned t size and size of the
front mass and the vibration element provided between the front mass and the rear mass 7, one
front mass The pressure chamber and one case are provided with a pressure control valve
between the mounting plate, the case, the image pickup element, and the rear mass via a
vibration control rubber, and the case internal pressure is reduced with respect to the external
pressure applied by the medium. (D, because the pressure-sensitive rubber, etc. can not permeate
through the medium such as water, the adhesive of the internal vibration element, the
deterioration of the electrical system, etc. It is lost, and use in one quality such as Choro water is
in town ihi, and it is possible to adjust the internal pressure, so it has the effect of mass
production etc.)