JP4055694B2 - レーザ駆動回路 - Google Patents
レーザ駆動回路 Download PDFInfo
- Publication number
- JP4055694B2 JP4055694B2 JP2003359696A JP2003359696A JP4055694B2 JP 4055694 B2 JP4055694 B2 JP 4055694B2 JP 2003359696 A JP2003359696 A JP 2003359696A JP 2003359696 A JP2003359696 A JP 2003359696A JP 4055694 B2 JP4055694 B2 JP 4055694B2
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- semiconductor laser
- operating current
- voltage
- circuit
- current control
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- 239000004065 semiconductor Substances 0.000 claims description 67
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 description 9
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 230000005856 abnormality Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
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Description
先ず、実施形態1の基本的な構成について図1〜4を用いて説明する。
実施形態2は、半導体レーザ1と、受光素子2と、電流−電圧変換回路3と、APC回路4と、電源5とを備える点では実施形態1と同様であるが、実施形態1にはない以下に記載の特徴部分がある。図2に示す動作電流制御素子40a,40bのそれぞれに、図5に示すように、短絡検出回路6a,6bが並列に接続する。短絡検出回路6a,6bは、差動増幅回路60a,60bと比較器61a,61bと報知器62a,62bとをそれぞれ備える。
2 受光素子
3 電流−電圧変換回路
4a 第1APC回路
4b 第2APC回路
40a,40b 動作電流制御素子
41a,41b 光量制御素子
5a 第1電源
5b 第2電源
6a,6b 短絡検出回路
Claims (2)
- 半導体レーザと、前記半導体レーザから発光された光を受光しその受光量に基くモニター電流を出力する受光素子とを備えるとともに、
前記半導体レーザの動作電流を制限する動作電流制御素子と前記モニター電流値が前記半導体レーザの光出力を決定するための基準値になるように前記動作電流制御素子を制御する光量制御素子とを含むAPC回路を複数備え、
前記複数のAPC回路に含まれる全ての動作電流制御素子及び前記半導体レーザが直列に接続され、
前記複数のAPC回路のそれぞれに、前記基準値を作るための電源を1つずつ別個に設けることを特徴とするレーザ駆動回路。 - 前記複数の動作電流制御素子のそれぞれ又は全体の両端電圧を検出し、
前記両端電圧と予め前記動作電流制御素子の短絡時の電圧として設定された比較電圧との比較を行い、
前記両端電圧が前記比較電圧より低い場合に前記動作電流制御素子の少なくとも1つが短絡していることを報知する短絡検出回路を備えることを特徴とする請求項1記載のレーザ駆動回路。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003359696A JP4055694B2 (ja) | 2003-10-20 | 2003-10-20 | レーザ駆動回路 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2003359696A JP4055694B2 (ja) | 2003-10-20 | 2003-10-20 | レーザ駆動回路 |
Publications (2)
Publication Number | Publication Date |
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JP2005123536A JP2005123536A (ja) | 2005-05-12 |
JP4055694B2 true JP4055694B2 (ja) | 2008-03-05 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2003359696A Expired - Lifetime JP4055694B2 (ja) | 2003-10-20 | 2003-10-20 | レーザ駆動回路 |
Country Status (1)
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JP (1) | JP4055694B2 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101749802B (zh) * | 2008-12-02 | 2014-10-08 | 三星电子株式会社 | 空调机 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013207244A (ja) * | 2012-03-29 | 2013-10-07 | Taiyo Yuden Co Ltd | レーザポインタ |
KR101956898B1 (ko) * | 2017-12-27 | 2019-03-12 | (주)초이스테크놀로지 | 레이저광원의 출력제어장치 및 그를 포함하는 레이저 포인터 |
-
2003
- 2003-10-20 JP JP2003359696A patent/JP4055694B2/ja not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101749802B (zh) * | 2008-12-02 | 2014-10-08 | 三星电子株式会社 | 空调机 |
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Publication number | Publication date |
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JP2005123536A (ja) | 2005-05-12 |
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