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 |
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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