JPS6042981U

JPS6042981U - ultrasonic switch

Info

Publication number: JPS6042981U
Application number: JP13568583U
Authority: JP
Inventors: 川口　昭次郎
Original assignee: 松下電工株式会社
Priority date: 1983-08-31
Filing date: 1983-08-31
Publication date: 1985-03-26
Also published as: JPH037827Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す構成図、第２図は動作
状態を示すタイムチャート、第３図は超音波スイッチを
複数使用した際の動作説明図である。１・・・・・・周期発振回路、２・・・・・・超音波発
振回路、３・・・・・・パルス幅決定用ゲート、４・・
・・・・電力増幅器、５・・・・・・送波器、６・・・
・・・受波器、７，９・・・・・・増幅器、８・・・・
・・検波回路、１０・・・・・・近距離用マルチ、１２
・・・・・・インバータ、１３・・・・・・アンドゲー
ト、１４・・・・・・基準パルス幅記憶回路、１５・・
・・・・パルス幅検出回路、１６・・・・・・パルス幅
比較回路、１７．２０・・・・・・ゲート、１８・・・
・・・周期計測回路、１９・・・・・・遅延発振回路、
２１・・・・・・オアゲート、２２・・・・・・リレー
動作回路、２３・・・・・・リレー、Ａ・・・・・・ゲ
ート信号発生回路、Ｂ・・・・・・パルス幅検定回路、
Ｃ・・・・・・周期検定回路、Ｍ・・・・・・被検出体
。FIG. 1 is a configuration diagram showing an embodiment of the present invention, FIG. 2 is a time chart showing the operating state, and FIG. 3 is an explanatory diagram of the operation when a plurality of ultrasonic switches are used. 1... Periodic oscillation circuit, 2... Ultrasonic oscillation circuit, 3... Gate for determining pulse width, 4...
...Power amplifier, 5...Transmitter, 6...
...Receiver, 7,9...Amplifier, 8...
...Detection circuit, 10...Multi for short distance, 12
...Inverter, 13...AND gate, 14...Reference pulse width memory circuit, 15...
...Pulse width detection circuit, 16...Pulse width comparison circuit, 17.20...Gate, 18...
...Period measurement circuit, 19...Delay oscillation circuit,
21...OR gate, 22...Relay operation circuit, 23...Relay, A...Gate signal generation circuit, B...Pulse width verification circuit,
C...Period test circuit, M...Detected object.

Claims

[Scope of utility model registration request]

(1) In an ultrasonic switch that generates ultrasonic pulses at regular intervals, detects the presence of an object using the reflected waves of the ultrasonic pulses, and drives a relay, the reflected waves of the ultrasonic pulses repeatedly arrive. An ultrasonic switch characterized by comprising a period verification circuit that detects a period a plurality of times and outputs a drive signal to the relay when the periods are the same.

(2) The period verification circuit includes a period measuring circuit that measures the time from the transmission of the ultrasonic pulse to the arrival of the first reflected wave, a gate that takes out the second reflected wave, and a period measuring circuit that measures the time from the transmission of the ultrasonic pulse to the arrival of the first reflected wave, and a gate that takes out the second reflected wave, and the first reflected wave. and a delay oscillation circuit that sends an opening signal of a constant width to the gate with a delay of the time measured by the period measuring circuit after detecting the period, and a relay is driven by the output signal of the gate. The ultrasonic switch according to item 1.