JPS5361999A - Ultrasonic guarding device - Google Patents
Ultrasonic guarding deviceInfo
- Publication number
- JPS5361999A JPS5361999A JP13885776A JP13885776A JPS5361999A JP S5361999 A JPS5361999 A JP S5361999A JP 13885776 A JP13885776 A JP 13885776A JP 13885776 A JP13885776 A JP 13885776A JP S5361999 A JPS5361999 A JP S5361999A
- Authority
- JP
- Japan
- Prior art keywords
- ultrasonic
- guarding device
- fixed
- circuit
- phase
- 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.)
- Pending
Links
Landscapes
- Burglar Alarm Systems (AREA)
Abstract
PURPOSE: To prevent false operations by disturbance noises and simplify circuit configurations by so arranging the circuits that the alarm circuit is operated only when the output level of a phase difference detecting circuit is above a fixed limit and the direction of the change of phase is fixed.
COPYRIGHT: (C)1978,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13885776A JPS5361999A (en) | 1976-11-15 | 1976-11-15 | Ultrasonic guarding device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13885776A JPS5361999A (en) | 1976-11-15 | 1976-11-15 | Ultrasonic guarding device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5361999A true JPS5361999A (en) | 1978-06-02 |
Family
ID=15231760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13885776A Pending JPS5361999A (en) | 1976-11-15 | 1976-11-15 | Ultrasonic guarding device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5361999A (en) |
-
1976
- 1976-11-15 JP JP13885776A patent/JPS5361999A/en active Pending
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