发明授权
- 专利标题： Semiconductor laser driving circuit
- 专利标题（中）： 半导体激光驱动电路
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申请号： US650422申请日： 1991-02-04
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公开(公告)号： US5163063A公开(公告)日： 1992-11-10
- 发明人: Yukio Yoshikawa , Takeshi Ishii , Yoshihiro Oyama , Tatsuo Sasaki , Tamotsu Takahashi , Shinichi Sato , Kazumasa Moriya , Ichiro Shinoda , Motohiko Itoh , Tomoyuki Kashiwazaki , Hiroaki Kawai , Mitsuo Watanabe
- 申请人： Yukio Yoshikawa , Takeshi Ishii , Yoshihiro Oyama , Tatsuo Sasaki , Tamotsu Takahashi , Shinichi Sato , Kazumasa Moriya , Ichiro Shinoda , Motohiko Itoh , Tomoyuki Kashiwazaki , Hiroaki Kawai , Mitsuo Watanabe
- 申请人地址： JPX both of JPX both of
- 专利权人： Copal Co., Ltd.,Fujitsu Limited
- 当前专利权人： Copal Co., Ltd.,Fujitsu Limited
- 当前专利权人地址： JPX both of JPX both of
- 优先权： JPX2-29098 19900207; JPX2-29099 19900207; JPX2-29100 19900207; JPX2-29101 19900207; JPX2-29102 19900207; JPX2-29103 19900207; JPX2-113660 19900427
- 主分类号： G06K7/10
- IPC分类号： G06K7/10 ; H01S5/068 ; H01S5/0683
摘要：
A semiconductor laser driving circuit has a semiconductor laser for emitting a laser beam according to a drive power. A photodetector is provided for effecting photo-electric conversion of the laser beam to output a corresponding electric signal. A monitoring circuit is connected for monitoring the electric signal to output a monitor signal indicative of variation in intensity of the laser beam. A controlling circuit is connected for comparing the monitor signal with a given reference signal to output a control signal according to difference therebetween. A powering circuit is operative according to the control signal to apply to the semiconductor laser a drive power effective to eliminate the difference. An abnormality detecting circuit is provided for comparing the monitor signal with a given limit signal which is set different from the reference signal to detect abnormality to output an abnormality signal.
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