JPH0865788

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DESCRIPTION JPH0865788
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic transducer, and more specifically, a transducer array is arranged in a cylindrical shape,
emits ultrasonic waves in all directions, and a received signal from its reflected wave. The present
invention relates to an ultrasonic transducer used for so-called scanning sonar or the like, which
forms directivity by phase synthesis and measures the distance and orientation of a target in
water.
[0002]
2. Description of the Related Art Conventionally, a transducer array constituting an ultrasonic
transducer of this type comprises a plurality of piezoelectric ceramic transducer elements, and
generates sound by isolating sound from surfaces other than the radiation surface of the
ultrasonic wave. It molds with urethane etc. which are materials which permeate ¦ transmit, and
arranges several vibrator ¦ oscillator rows in cylindrical shape, and is comprised. In this case,
since a molding material such as urethane transmits ultrasonic waves, when fixing the transducer
array to another member, it is necessary to select and fix a portion which does not affect
ultrasonic vibration.
[0003]
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The ultrasonic transducer thus formed is mounted directly on the bottom of a ship or the like, or
is housed in a dome filled with insulating oil and used underwater (including in seawater). When
housed and used in a dome, it is necessary that the shape of the dome and its material have low
attenuation of ultrasonic waves and do not impair the directivity characteristics of ultrasonic
waves, and they are related to the transducer array The electrical circuit unit is usually also
molded together with the transducer array. Also, in this case, the connection between the
transducer array and the electric circuit unit is made by the wiring pattern on the printed circuit
board, and therefore, the printed circuit board is also generally molded integrally.
[0004]
As described above, the conventional ultrasonic transducer uses urethane or the like which is an
ultrasonic permeable material for the mold, and therefore the thermal conductivity is poor.
However, there has been a problem that the temperature of the transducer element and the
electric circuit rises to affect the characteristics thereof.
[0005]
The present invention has been made to solve the above problems, and it is an object of the
present invention to provide an ultrasonic transducer capable of obtaining a good cooling effect.
[0006]
SUMMARY OF THE INVENTION An ultrasonic transducer according to the present invention
comprises a plurality of arrays of transducer elements provided with hard pins on the electrode
surface of a piezoelectric ceramic transducer element as ultrasonic radiation surfaces. A vibrator
array constructed by molding the other surface except for the molded sound insulation material,
and the vibrator array is mounted on the lower plane, and the electric power is connected to the
vibrator array mounted on the lower plane on the upper plane thereof A long plate-like printed
circuit board on which the circuit unit is mounted, and a plurality of the long plate-like printed
circuit boards are arranged on the same circumference of the ultrasonic radiation surface of each
transducer array mounted on each of the plurality of substrates. Holders held so as to be
arranged at equal intervals to one another, the directivity characteristics of the ultrasonic waves
radiated from the radiation surface of the ultrasonic waves of the respective transducer arrays
arranged at equal intervals on the same circumference are not impaired Surround all transducer
rows with similar shape and material Dome, characterized by comprising an insulating oil
immersing the all transducers column is filled in the dome.
[0007]
Further, the insulating oil is characterized in that the height is maintained so as not to immerse
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the electric circuit unit.
[0008]
Further, among the holders, the holder provided between the vibrator array and the electric
circuit unit has a watertight structure.
[0009]
[Operation] The ultrasonic transducer according to the present invention is configured as
described above, so that the transducer array is used by being immersed in insulating oil filled in
the dome, such as urethane, etc. Molding with a material with poor thermal conductivity can be
avoided.
[0010]
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a
perspective view showing the arrangement on each printed circuit board of FIG.
The piezoelectric ceramic transducer element 1 is provided with the hard pins 2 at both
electrodes thereof, a plurality of transducer elements 1 are arranged in one row, only the
ultrasonic radiation surface is exposed, and the other surface is a molded sound insulation
material 3 It is molded to constitute one transducer array.
[0011]
The direction of arrangement of the transducers in the transducer array is vertical when the
transducer is mounted on a ship.
Thus, this arrangement determines the directivity of the ultrasound in the vertical plane.
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One vibrator array is mounted on the lower plane of the printed board 4 on one long plate, and
the electric circuit unit 5 connected to the vibrator array is mounted on the upper plane of the
printed board 4 .
The transducer array and the electric circuit unit 5 are connected via a wiring pattern on the
printed circuit board.
[0012]
Several tens of printed circuit boards 4 configured in this manner are radially arranged with the
direction of length as the vertical direction, and in the case of projection onto the horizontal
plane, the transducer rows have the same circumferential shape and are equally spaced from
each other. Fix with holders 6, 7 and 8 so that
The holder 6 fixes the upper side of each printed circuit board 4 and the holder 8 fixes its lower
side. In the central holder 7, only a groove for holding the thickness of the printed circuit board 4
is opened in the plate, and each printed circuit board is fitted in this groove. Then, the gap of the
inset is potted with silicon or the like to form a watertight partition wall.
[0013]
A portion below the holder 7 is covered with a dome 11. It is necessary that the dome 11 has low
attenuation of ultrasonic vibration and does not become an obstacle to the directivity
characteristic of ultrasonic waves. The insulating oil 10 is filled in the dome 11 so that the
ultrasonic waves from the transducer array can be well transmitted to the water through the
dome 11. The upper part from the holder 7 is covered with the case 12 so that the electric circuit
unit 5 is cooled by air cooling. The case 12 is made of a material having a good thermal
conductivity because it is not related to the propagation of ultrasonic waves. The electric circuit
unit 5 may be immersed in the insulating oil 10 without using the holder 7 as a watertight
partition wall.
[0014]
As described above, in the ultrasonic transducer according to the present invention, the
transducer array is made to be oil-cooled and the electric circuit unit is avoided by avoiding
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molding with a material having poor thermal conductivity. A good cooling effect can be obtained
by air-cooling or oil-cooling and by making the outside of the dome 11 and the case 12 in
contact with water in a state of being actually used.
[0015]
Brief description of the drawings
[0016]
1 is a perspective view showing an embodiment of the present invention.
[0017]
2 is a perspective view showing the equipment of the printed circuit board of FIG.
[0018]
Explanation of sign
[0019]
DESCRIPTION OF SYMBOLS 1 Piezoelectric ceramic vibrator element 2 Hard pin 3 Shaped sound
insulation material 4 Printed circuit board 5 Electric circuit unit 6, 7, 8 Holder 9 Potting 10
Insulating oil 11 Dome 12 Case
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