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JP2005039689

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DESCRIPTION JP2005039689
An ultrasonic wave in which a piezoelectric element is bonded to the bottom of a bottomed
cylindrical case to form a vibrating body, and directivity characteristics of transmission and
reception become asymmetric with respect to an axis passing perpendicularly through the
bottom center of the bottomed cylindrical case. Provide a sensor. In a bottom surface 4 of a
bottomed cylindrical case to which a piezoelectric element 2 is to be bonded together, a step
having different thicknesses of the bottom surface 4 of the bottomed cylindrical case is provided
in multiple steps or oblique slits to maximize thickness. The piezoelectric element 2 is bonded to
the surface. [Selected figure] Figure 1
Ultrasonic sensor
[0001]
The present invention relates to a drip-proof ultrasonic sensor for transmitting and receiving
ultrasonic frequency bands.
[0002]
The ultrasonic sensor of the conventional drip-proof structure is demonstrated based on FIG.
In the figure, the piezoelectric element 2 is bonded with an adhesive 3 inside the bottom 5 of the
bottomed cylindrical case to form a vibrator. In this case, the bottom surface 5 of the bottomed
cylindrical case to which the piezoelectric element 2 is bonded is provided with one step.
03-05-2019
1
Japanese Patent Laid-Open No. 2000-152387
[0003]
In the conventional drip-proof ultrasonic sensor, the area at the bottom of the bottomed
cylindrical case and the thickness thereof, and the piezoelectric element to be bonded to that
portion determine the frequency at which the transmission output and the reception sensitivity
become maximum. The directional characteristics of transmission and reception are determined
by the frequency and the area of the bottom of the bottomed cylindrical case. This directivity
characteristic has a conical characteristic centered on an axis perpendicular to the bottom
surface, passing from the bottom surface center to the bottom surface center. In general, when
the frequency is the same, narrow directivity is exhibited when the area of the bottom surface
constituting the vibrator is increased, and narrow directivity is exhibited when the frequency of
the vibrator is high when the area of the bottom surface constituting the vibrator is identical
Indicates Therefore, it has been difficult to manufacture a small drip-proof ultrasonic sensor
having a narrow directivity characteristic in a 20-50 kHz drip-proof ultrasonic sensor having
good air propagation. As a countermeasure, as shown in FIG. 2, one step was provided on the
bottom of the bottomed cylindrical case, but as shown in FIG. When the drip-proof ultrasonic
sensor is used to detect an object such as a back sensor of a car, there is a problem that the
reflection on the road surface is broadened and accurate control can not be performed.
[0004]
At the bottom of the bottomed cylindrical case, two or more steps or oblique slits are provided on
the bottom of the bottom side of the piezoelectric element, and the piezoelectric element is
bonded to the surface with the largest thickness. Tilt to
[0005]
In the ultrasonic sensor according to the embodiment of the present invention, two or more steps
or oblique slits are provided on the bottom surface of the bottomed cylindrical case, and the
directivity characteristics for transmitting and receiving are centering on the bottom case Can be
tilted with respect to the axis passing through vertically.
Therefore, when it is used as a back sensor of a car, as shown in FIG. 5, it does not receive the
reflection of the ground, and accurate object detection control becomes possible.
03-05-2019
2
[0006]
When used for object detection such as a back sensor of a car, the purpose of accurate control
was realized without changing the external shape of the sensor without spreading the reflection
of the road surface.
[0007]
As shown in FIG. 1, the piezoelectric element 2 is bonded with an adhesive 3 to the bottom
surface of the bottomed cylindrical case where the thickness is maximized.
The step d1 of the thickness of the bottom surface 4 of the bottomed cylindrical case is set in the
range of 0.1 to 0.5 mm, and the piezoelectric element is bonded to the surface where the
thickness of the case is the largest to constitute a vibrator. In the conventional product, as shown
in FIG. 4, it inclines by 4 degrees with respect to an axis perpendicular to the center of the
bottom, but in the present invention, as shown in FIG. θ can be 8 degrees or more.
[0008]
As in the first embodiment, as shown in FIG. 7, the piezoelectric element 2 is bonded with an
adhesive 3 to one of the bottom surfaces of the bottomed cylindrical case having the largest
thickness. The thickness d2 of the oblique slit of the bottomed cylindrical case is set in the range
of 0.1 to 0.5 mm, and the piezoelectric element is bonded to the surface where the thickness of
the case is the largest to constitute a vibrator. In the conventional product, as shown in FIG. 4, it
inclines by 4 degrees with respect to an axis perpendicular to the center of the bottom, but in the
present invention, as shown in FIG. θ can be 8 degrees or more.
[0009]
When used for object detection such as a back sensor of a car, accurate control can be performed
without reflection of the road surface.
[0010]
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3
The schematic structure figure of the principal part of the ultrasonic sensor concerning the
embodiment of the present invention (claim 1).
The schematic structure figure of the principal part of the ultrasonic sensor concerning a
conventional form. Explanatory drawing which shows the directional characteristic of the
ultrasonic sensor which concerns on embodiment of this invention. Explanatory drawing which
shows the directional characteristic of the ultrasonic sensor which concerns on the conventional
form. Explanatory drawing which shows the detection area when the ultrasonic sensor which
concerns on embodiment of this invention is mounted in the motor vehicle. Explanatory drawing
which shows the detection area when the ultrasonic sensor which concerns on the conventional
form is mounted in the motor vehicle. The schematic structural drawing of the principal part of
the ultrasonic sensor which concerns on embodiment of this invention (claim 2).
Explanation of sign
[0011]
1 Bottomed cylindrical case 2 Piezoelectric element 3 Adhesive 4 Bottom surface of stepped
bottomed cylindrical case 5 Side wall portion of bottomed cylindrical case 6 Bottom surface of
conventional bottomed cylindrical case 7 Diagonal of bottomed cylindrical case Bottom with slit
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