JPS5361999A - Ultrasonic guarding device - Google Patents

Ultrasonic guarding device

Info

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
Application number
JP13885776A
Other languages
Japanese (ja)
Inventor
Hiroshi Ohashi
Hironobu Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP13885776A priority Critical patent/JPS5361999A/en
Publication of JPS5361999A publication Critical patent/JPS5361999A/en
Pending legal-status Critical Current

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
JP13885776A 1976-11-15 1976-11-15 Ultrasonic guarding device Pending JPS5361999A (en)

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)

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