发明名称 |
DISPOSITIF DE MESURE DE DISTANCE PAR ULTRASONS POUR APPAREIL PHOTOGRAPHIQUE |
摘要 |
<p>The arrangement includes a large value capacitor (3) charged from a battery (1) through a resistor (2). The capacitor is discharged in an oscillating manner into a step up transformer (4) whose primary (4a) is switched by a transistor (5) driven from an oscillator (7) when a button is pressed to activate the circuit. The transformer output drives the ultrasonic transducer (6). The reflected signal from an object (P) is applied to a gate (8) closed during the transmission period. The signal is amplified (9) and a circuit (10) compares the amplitude with a reference value. The output of the comparator and oscillator are applied to a counter (11) to determine the time interval between the time the oscillator commenced and the time when the comparator produced an output. This value is releated to the target object range.</p> |
申请公布号 |
FR2503873(A1) |
申请公布日期 |
1982.10.15 |
申请号 |
FR19820006305 |
申请日期 |
1982.04.09 |
申请人 |
WEST ELECTRIC CY LTD |
发明人 |
HIROSHI MAKINO, KATSUJI ISHIKAWA ET WATARU HASEGAWA;ISHIKAWA KATSUJI;HASEGAWA WATARU |
分类号 |
G03B13/36;G01S3/80;G01S3/801;G01S15/14;G02B7/28;G02B7/40;(IPC1-7):01S15/08 |
主分类号 |
G03B13/36 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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