发明名称 SEMICONDUCTOR LASER DRIVE CIRCUIT
摘要 PURPOSE:To inform that the replacement time of a laser diode is getting near by a method wherein the rise time of a monitor signal is checked, and a warning signal is outputted corresponding to the delay of the monitor signal. CONSTITUTION:When a monitored voltage Vmnt exceeds a reference voltage Vcmp, a comparator 25 outputs an inverted signal and detects the rise time of the monitored voltage. A first delay circuit 59 outputs a first delay signal after a delay time set responding to the trailing edge of a lighting signal LDON. A second delay circuit 60 outputs a second delay signal after a delay time set responding to the first delay signal output has elapsed.
申请公布号 JPH03232288(A) 申请公布日期 1991.10.16
申请号 JP19900029103 申请日期 1990.02.07
申请人 COPAL CO LTD;FUJITSU LTD 发明人 YOSHIKAWA YUKIO;ISHII TAKESHI;OYAMA YOSHIHIRO;SATO SHINICHI;WATANABE MITSUO
分类号 G11B7/125;H01S5/00;H01S5/042 主分类号 G11B7/125
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