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DESCRIPTION JP2009094845

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DESCRIPTION JP2009094845
In a bottomed cylindrical case related to a conventional embodiment, since a bottom corner
portion of a groove provided on a piezoelectric element bonding surface of a bottomed
cylindrical case has an acute angle, stress is applied to that portion by bending vibration.
Concentration, and repeated fatigue could cause cracks in the corners. In a continuous groove
provided on a piezoelectric element bonding surface of a bottomed cylindrical case, a unimorph
oscillator is formed by rounding a bottom surface and a wall surface of the groove portion
without forming an edge shape constituted by a straight line. Reduces the stress concentration on
the corner of the groove bottom when bending vibration occurs, and prevents the corner from
being cracked. [Selected figure] Figure 1
Ultrasonic transducer
[0001]
The present invention relates to an ultrasonic transducer that transmits and receives ultrasonic
frequency bands.
[0002]
As a conventional embodiment, an ultrasonic transducer is formed by bonding a piezoelectric
element to the inside of the bottom surface of a bottomed cylindrical case to form a unimorph
transducer, and transmitting and receiving ultrasonic waves on the case outer surface of this
vibrator. For example, in the case of realizing an ultrasonic transducer having a resonance mode
corresponding to a plurality of primary vibration modes, at least one continuous groove is
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provided on the piezoelectric element bonding surface of the bottomed cylindrical case, and the
groove portion Stick the piezoelectric element so as to cover the
FIG. 3 shows a schematic longitudinal sectional view of a bottomed cylindrical case used for an
ultrasonic transducer according to a conventional embodiment. In FIG. 3, the piezoelectric
element 1 is bonded to the inside of the bottom of a bottomed cylindrical case 2 made of an
aluminum material or the like to form a unimorph oscillator, and ultrasonic waves are
transmitted and received by repeating bending vibration. As shown in FIG. 3, in the bottomed
cylindrical case according to the conventional embodiment, as shown in the cross sectional view,
an edge in which the bottom and the wall of the groove provided on the piezoelectric element
bonding surface of the bottomed cylindrical case are straight. The bending vibration causes
stress to be concentrated on that portion, and repeated fatigue may cause cracks in the edge.
Japanese Patent Application No. 2007-221522
[0003]
It is an object of the present invention to improve the occurrence of cracks in an edge portion
due to repeated fatigue in bending vibration of a unimorph oscillator at a bottom surface and a
wall edge portion of a groove provided on a piezoelectric element bonding surface of a bottomed
cylindrical case.
[0004]
Stress at the time of unimorph vibrator bending vibration by rounding the bottom and wall of the
groove in the at least one groove provided in the piezoelectric element bonding surface of the
bottomed cylindrical case without forming an edge shape constituted by a straight line. Eliminate
concentration points and prevent cracks from forming in part of the groove.
[0005]
In at least one groove provided in the piezoelectric element bonding surface of the bottomed
cylindrical case according to the present invention, the stress concentration on the groove edge
portion when the unimorph oscillator performs bending vibration is relaxed, and a crack is
formed in the corner portion Prevent entry.
As a result, the durability of the ultrasonic transducer can be improved, and stable obstacle
detection can be performed without erroneous detection.
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[0006]
When used as a back sensor or corner sensor, one type of ultrasonic transducer is embedded in a
bumper of a car and the like, and driven at a resonance frequency according to the purpose of
use to detect an obstacle.
[0007]
FIG. 1 shows a schematic top view and a longitudinal cross-sectional view of a low cylindrical
case in an ultrasonic transducer according to an embodiment of the present invention.
In FIG. 1, a groove 7 is provided inside the bottom of a bottomed cylindrical case 2 made of an
aluminum material or the like, and the piezoelectric element 1 is bonded to cover the groove to
form a unimorph vibrator.
FIG. 2 is a schematic top view and a longitudinal cross-sectional view of a low-profile cylindrical
case in an ultrasonic transducer according to another embodiment of the present invention. In
FIG. 2, when rounding the bottom bottom corner portion of the groove 7 provided inside the
bottom of the bottomed cylindrical case 2 made of aluminum material or the like, the center may
be raised. FIG. 4 shows a schematic longitudinal sectional view of an ultrasonic transducer
according to an embodiment of the present invention. In FIG. 4, the piezoelectric element 1 is
bonded to the inside of the bottom of the bottomed cylindrical case 2 to form a unimorph
vibrator. The input / output lead 5a and the input / output lead 5b are taken out by soldering or
the like from the opposite surface of the surface of the piezoelectric element 1 to which the
bottomed cylindrical case 2 is adhered. The bonding surface side of the piezoelectric element 1
with the bottomed cylindrical case 2 is electrically connected to the bottomed cylindrical case 2,
and further, the piezoelectric element 1, the input / output lead 5 a, and the bottomed cylindrical
case 2 And the input / output lead 5b are electrically connected. The input / output leads 5a and
5b are respectively soldered to the connector-attached wire leads 6. The sound absorbing
material 3 made of silicon foam or the like is placed on the upper surface of the piezoelectric
element 1, and then the sealant 4 made of an elastic material such as silicon material or urethane
material is placed in the bottomed cylindrical case 2. Fill and make up. FIG. 5 is a stress analysis
result when the bottomed cylindrical case according to the embodiment of the present invention
and FIG. 6 is a bending vibration of the bottomed cylindrical case according to the conventional
embodiment. As shown in FIG. 6, in the bottomed cylindrical case according to the conventional
embodiment, stress is concentrated at the edge portion of the groove bottom, but in the
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bottomed cylindrical case according to the embodiment of the present invention shown in FIG.
Durability improves because concentration is relaxed.
[0008]
The present invention can be applied not only to a vehicle back sensor but also to various fields
in which a drip-proof ultrasonic transducer is used.
[0009]
A schematic top view and a longitudinal sectional view of a low-yield cylindrical case of an
ultrasonic transducer according to an embodiment of the present invention A schematic view of a
low-yield cylindrical case of an ultrasonic transducer according to another embodiment of the
present invention Top view and vertical cross-sectional view Schematic vertical cross-sectional
view of the ultrasonic transducer according to the embodiment of the present invention
Schematic top view and vertical cross-section of the low-yield cylindrical case of the ultrasonic
transducer according to the conventional embodiment Figure Stress analysis results when
bending bottomed cylindrical case according to the embodiment of the present invention while
bending vibration Stress analysis results when bending bottomed cylindrical case according to
the conventional embodiment when bending
Explanation of sign
[0010]
DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2 Bottomed cylindrical case 3 Sound
absorbing material 4 Sealant 5a I / O lead 5b I / O lead 6 Wire lead with connector 7 Groove
provided in the bottom of the low-bar cylindrical case
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