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DESCRIPTION JPH08130795

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DESCRIPTION JPH08130795
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic sensor used to detect a human body or an object, for example, in the vicinity of an
automatic door.
[0002]
2. Description of the Related Art A conventional ultrasonic sensor will be described with
reference to FIG.
[0003]
FIG. 2 is a cross-sectional view showing a conventional ultrasonic sensor, in which an aluminum
ring 3 is fixed to an aluminum case 2 to which a piezoelectric ceramic 1 is bonded, and a
terminal pin 8 is implanted in the aluminum case 2. The terminal plate 7 is placed via the spacer
5 and fixed by the elastic adhesive 9.
[0004]
Here, the conventional method is that the aluminum ring 3 is fixed to the aluminum case 2 by the
adhesive 4.
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1
Reference numeral 6 in FIG. 2 denotes a lead wire electrically connecting the terminal pin 8 to
the piezoelectric ceramic 1 and the aluminum case 2.
[0005]
However, in the conventional ultrasonic sensor, since the aluminum case 2 and the aluminum
ring 3 are cured and fixed using the adhesive 4, the adhesive application in the manufacturing
process There is a problem that frequency variations occur due to variations in the amount and
the application position, and variations occur in the output sound pressure level and the
reception sensitivity level of ultrasonic waves at a certain frequency point (for example, 40 kHz).
[0006]
An object of the present invention is to provide an ultrasonic sensor which does not require an
adhesive for fixing the above-mentioned members.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, an ultrasonic sensor
according to the present invention comprises an aluminum ring screwed on the outer periphery
and an aluminum case screwed on the inner periphery. Is screw-welded.
[0008]
[Function] Using the screwed aluminum ring and aluminum case thus screwed, it becomes
possible to fix the aluminum ring and the aluminum case simply by screwing, as in the prior art.
Since the fixation with the adhesive is unnecessary and the frequency variation is reduced, the
variation in the output sound pressure level and the reception sensitivity level of the ultrasonic
wave at a certain frequency point (for example, 40 kHz) can be reduced.
[0009]
Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an ultrasonic sensor according to an embodiment of the
present invention, in which a terminal plate 7 having a terminal pin 8 implanted therein is
mounted via an spacer 5 on an aluminum case 10 to which a piezoelectric ceramic 1 is bonded. It
is fixed by the elastic adhesive 9 and the terminal pin 8 is connected to the aluminum case 10
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2
and the piezoelectric ceramic 1 by the lead wire 6 as in the prior art.
[0010]
However, in this embodiment, the aluminum ring 11 whose outer peripheral portion is screwed
and the aluminum case 10 whose inner peripheral portion is screwed are fixed using screw
pressure contact.
[0011]
Thus, in the ultrasonic sensor of this embodiment, since the screwed aluminum ring 11 and the
aluminum case 10 are used, the aluminum ring 11 and the aluminum case 10 can be fixed only
by screwing, as in the prior art. By eliminating the need for fixing with an adhesive and reducing
the frequency variation, it is possible to reduce the variation in the output sound pressure level
and the reception sensitivity level of ultrasonic waves at a certain frequency point (for example,
40 kHz).
[0012]
As described above, according to the present invention, an aluminum ring screwed to the outer
peripheral portion and an aluminum case screwed to the inner peripheral portion are used to
form an aluminum ring Fixing to the aluminum case is possible only by screwing work, so fixing
with the adhesive is unnecessary and the frequency variation is reduced, so the output sound
pressure level and reception of ultrasonic waves at a certain frequency point (for example, 40
kHz) The variation in sensitivity level is reduced, and the performance of the ultrasonic sensor
can be improved.
[0013]
Brief description of the drawings
[0014]
1 is a cross-sectional view of an ultrasonic sensor according to an embodiment of the present
invention.
[0015]
Fig. 2 Cross section of a conventional ultrasonic sensor
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[0016]
Explanation of sign
[0017]
DESCRIPTION OF SYMBOLS 1 Piezoelectric ceramic 5 Spacer 6 Lead wire 7 Terminal plate 8
Terminal pin 9 Elastic adhesive 10 Aluminum case 11 in which inner peripheral portion is
screwed Aluminum case 11 outer peripheral portion with aluminum ring
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