JPS6459183A - Transducer of ultrasonic range finder - Google Patents
Transducer of ultrasonic range finderInfo
- Publication number
- JPS6459183A JPS6459183A JP21699987A JP21699987A JPS6459183A JP S6459183 A JPS6459183 A JP S6459183A JP 21699987 A JP21699987 A JP 21699987A JP 21699987 A JP21699987 A JP 21699987A JP S6459183 A JPS6459183 A JP S6459183A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- temp
- change
- center
- flattening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Transducers For Ultrasonic Waves (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
PURPOSE:To exclude the lowering of sensitivity due to temp. change and to enhance the stability of operation, by sending out ultrasonic waves from vibration surfaces having different curvatures and flattening a synthetic frequency characteristic over a predetermined range before and behind center frequency. CONSTITUTION:A columnar polymer piezoelectric film vibrator 25 having a radius R1 of curvature is fixed to a reflector 14 having a flat part 24 and a piezoelectric film vibrator 26 having a different radius R2 of curvature is fixed to one end of said vibrator 25. The vibrators 25, 26 respectively show frequency characteristics having resonance frequency at an apex and united frequency shows an almost flat frequency characteristic with respect to the center resonance frequency during frequency change due to temp. As mentioned above, by flattening the synthetic frequency characteristic of ultrasonic waves over a predetermined range before and after the center frequency, the lowering of sensitivity due to wide temp. change is prevented and a signal processing circuit is simplified and operation is stabilized.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21699987A JPS6459183A (en) | 1987-08-31 | 1987-08-31 | Transducer of ultrasonic range finder |
US07/171,963 US4825116A (en) | 1987-05-07 | 1988-03-23 | Transmitter-receiver of ultrasonic distance measuring device |
DE3815359A DE3815359A1 (en) | 1987-05-07 | 1988-05-05 | TRANSMITTER / RECEIVER OF A ULTRASONIC DISTANCE MEASURING DEVICE |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21699987A JPS6459183A (en) | 1987-08-31 | 1987-08-31 | Transducer of ultrasonic range finder |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6459183A true JPS6459183A (en) | 1989-03-06 |
JPH0553379B2 JPH0553379B2 (en) | 1993-08-09 |
Family
ID=16697229
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21699987A Granted JPS6459183A (en) | 1987-05-07 | 1987-08-31 | Transducer of ultrasonic range finder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6459183A (en) |
-
1987
- 1987-08-31 JP JP21699987A patent/JPS6459183A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH0553379B2 (en) | 1993-08-09 |
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