JPS6459878A - Semiconductor laser protective circuit - Google Patents
Semiconductor laser protective circuitInfo
- Publication number
- JPS6459878A JPS6459878A JP62216827A JP21682787A JPS6459878A JP S6459878 A JPS6459878 A JP S6459878A JP 62216827 A JP62216827 A JP 62216827A JP 21682787 A JP21682787 A JP 21682787A JP S6459878 A JPS6459878 A JP S6459878A
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- output
- transistor
- turns
- protective circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
Abstract
PURPOSE:To prevent excessive voltage being applied to a semiconductor laser by controlling and monitoring a semiconductor laser based on a feedback amount of a photodiode and by stopping current supply to the semiconductor laser when the feedback amount is less than a standard value. CONSTITUTION:Should a circuit and LD1 are disconnected, the output current of PD2 stops and the output voltage of an amplifier 3 lowers. If a comparator 7 detects the above condition, the output of a flip-flop 8 changes from High level to Low level, a gate circuit 9 closes, a transistor 5 turns ON through a buffer gate 4, and a transistor 6 turns OFF thereby. Thus the current supply to LD1 can be stopped. Moreover, a switch 18 turns ON by the output of the gate circuit 9 thus grounding a collector of the transistor 6 and preventing excessive voltage over the rating from being applied to LD1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62216827A JPS6459878A (en) | 1987-08-31 | 1987-08-31 | Semiconductor laser protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62216827A JPS6459878A (en) | 1987-08-31 | 1987-08-31 | Semiconductor laser protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6459878A true JPS6459878A (en) | 1989-03-07 |
Family
ID=16694517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62216827A Pending JPS6459878A (en) | 1987-08-31 | 1987-08-31 | Semiconductor laser protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6459878A (en) |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59135898A (en) * | 1983-01-20 | 1984-08-04 | ザ・リ−ジエンツ・オブ・ザ・ユニバ−シテイ・オブ・カリフオルニア | Production of antigen peculiar human immune globulin |
| EP1854481A2 (en) | 1996-04-23 | 2007-11-14 | Chugai Seiyaku Kabushiki Kaisha | Cerebral stroke/cerebral edema preventive or remedy containing IL-8 binding inhibitor as active ingredient |
| WO2007129457A1 (en) | 2006-04-25 | 2007-11-15 | The University Of Tokyo | Therapeutic agents for alzheimer's disease and cancer |
| WO2008020586A1 (en) | 2006-08-14 | 2008-02-21 | Forerunner Pharma Research Co., Ltd. | Diagnosis and treatment of cancer using anti-desmoglein-3 antibody |
| WO2008047914A1 (en) | 2006-10-20 | 2008-04-24 | Forerunner Pharma Research Co., Ltd. | Cancer therapeutic agent comprising anti-hb-egf antibody as active ingredient |
| WO2008090901A1 (en) | 2007-01-23 | 2008-07-31 | Shinshu University | Chronic rejection inhibitor |
| EP1987842A1 (en) | 2000-04-28 | 2008-11-05 | Chugai Seiyaku Kabushiki Kaisha | Cell proliferation inhibitor |
| WO2009041062A1 (en) | 2007-09-28 | 2009-04-02 | Chugai Seiyaku Kabushiki Kaisha | Anti-glypican-3 antibody having improved kinetics in plasma |
| WO2009051108A1 (en) | 2007-10-15 | 2009-04-23 | Chugai Seiyaku Kabushiki Kaisha | Method for production of antibody |
| WO2009122667A1 (en) | 2008-04-04 | 2009-10-08 | 中外製薬株式会社 | Therapeutic for hepatic cancer |
| WO2010073694A1 (en) | 2008-12-25 | 2010-07-01 | 国立大学法人東京大学 | Diagnosis of treatment of cancer using anti-tm4sf20 antibody |
| WO2010119691A1 (en) | 2009-04-16 | 2010-10-21 | 国立大学法人東京大学 | Diagnosis and treatment of cancer using anti-tmprss11e antibody |
| WO2011021381A1 (en) | 2009-08-17 | 2011-02-24 | 株式会社未来創薬研究所 | Pharmaceutical composition containing anti-hb-egf antibody as active ingredient |
| US7931897B2 (en) | 2001-02-07 | 2011-04-26 | Chugai Seiyaku Kabushiki Kaisha | Therapeutic agent for hematopoietic tumors |
| WO2011093097A1 (en) | 2010-01-29 | 2011-08-04 | 株式会社未来創薬研究所 | Anti-dll3 antibody |
| WO2012144208A1 (en) | 2011-04-18 | 2012-10-26 | 国立大学法人東京大学 | Diagnosis and treatment of cancer using anti-itm2a antibody |
| WO2013047748A1 (en) | 2011-09-30 | 2013-04-04 | 中外製薬株式会社 | Antigen-binding molecule promoting disappearance of antigens having plurality of biological activities |
| WO2015046467A1 (en) | 2013-09-27 | 2015-04-02 | 中外製薬株式会社 | Method for producing polypeptide heteromultimer |
| WO2019225568A1 (en) | 2018-05-21 | 2019-11-28 | 中外製薬株式会社 | Lyophilized formulation sealed in glass vial |
| US10670223B2 (en) | 2018-04-24 | 2020-06-02 | Nichia Corporation | Light emitting module |
| WO2020116636A1 (en) | 2018-12-07 | 2020-06-11 | 小野薬品工業株式会社 | Immunosuppressant |
| WO2023058723A1 (en) | 2021-10-08 | 2023-04-13 | 中外製薬株式会社 | Method for preparing prefilled syringe formulation |
-
1987
- 1987-08-31 JP JP62216827A patent/JPS6459878A/en active Pending
Cited By (29)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59135898A (en) * | 1983-01-20 | 1984-08-04 | ザ・リ−ジエンツ・オブ・ザ・ユニバ−シテイ・オブ・カリフオルニア | Production of antigen peculiar human immune globulin |
| EP1854481A2 (en) | 1996-04-23 | 2007-11-14 | Chugai Seiyaku Kabushiki Kaisha | Cerebral stroke/cerebral edema preventive or remedy containing IL-8 binding inhibitor as active ingredient |
| EP1987842A1 (en) | 2000-04-28 | 2008-11-05 | Chugai Seiyaku Kabushiki Kaisha | Cell proliferation inhibitor |
| US7931897B2 (en) | 2001-02-07 | 2011-04-26 | Chugai Seiyaku Kabushiki Kaisha | Therapeutic agent for hematopoietic tumors |
| US8834876B2 (en) | 2001-02-07 | 2014-09-16 | Chugai Seiyaku Kabushiki Kaisha | Therapeutic agent for hematopoietic tumors |
| WO2007129457A1 (en) | 2006-04-25 | 2007-11-15 | The University Of Tokyo | Therapeutic agents for alzheimer's disease and cancer |
| WO2008020586A1 (en) | 2006-08-14 | 2008-02-21 | Forerunner Pharma Research Co., Ltd. | Diagnosis and treatment of cancer using anti-desmoglein-3 antibody |
| WO2008047914A1 (en) | 2006-10-20 | 2008-04-24 | Forerunner Pharma Research Co., Ltd. | Cancer therapeutic agent comprising anti-hb-egf antibody as active ingredient |
| WO2008090901A1 (en) | 2007-01-23 | 2008-07-31 | Shinshu University | Chronic rejection inhibitor |
| WO2009041062A1 (en) | 2007-09-28 | 2009-04-02 | Chugai Seiyaku Kabushiki Kaisha | Anti-glypican-3 antibody having improved kinetics in plasma |
| EP2617736A1 (en) | 2007-09-28 | 2013-07-24 | Chugai Seiyaku Kabushiki Kaisha | Anti-glypican 3 antibody having improved kinetics in plasma |
| EP2584043A2 (en) | 2007-09-28 | 2013-04-24 | Chugai Seiyaku Kabushiki Kaisha | Anti-glypican 3 antibody having improved kinetics in plasma |
| US8497355B2 (en) | 2007-09-28 | 2013-07-30 | Chugai Seiyaku Kabushiki Kaisha | Anti-glypican-3 antibody having improved kinetics in plasma |
| WO2009051108A1 (en) | 2007-10-15 | 2009-04-23 | Chugai Seiyaku Kabushiki Kaisha | Method for production of antibody |
| WO2009122667A1 (en) | 2008-04-04 | 2009-10-08 | 中外製薬株式会社 | Therapeutic for hepatic cancer |
| WO2010073694A1 (en) | 2008-12-25 | 2010-07-01 | 国立大学法人東京大学 | Diagnosis of treatment of cancer using anti-tm4sf20 antibody |
| WO2010119691A1 (en) | 2009-04-16 | 2010-10-21 | 国立大学法人東京大学 | Diagnosis and treatment of cancer using anti-tmprss11e antibody |
| WO2011021381A1 (en) | 2009-08-17 | 2011-02-24 | 株式会社未来創薬研究所 | Pharmaceutical composition containing anti-hb-egf antibody as active ingredient |
| WO2011093097A1 (en) | 2010-01-29 | 2011-08-04 | 株式会社未来創薬研究所 | Anti-dll3 antibody |
| EP3342786A1 (en) | 2010-01-29 | 2018-07-04 | Chugai Seiyaku Kabushiki Kaisha | Anti-dll3 antibody |
| EP3907242A1 (en) | 2010-01-29 | 2021-11-10 | Chugai Seiyaku Kabushiki Kaisha | Anti-dll3 antibody |
| WO2012144208A1 (en) | 2011-04-18 | 2012-10-26 | 国立大学法人東京大学 | Diagnosis and treatment of cancer using anti-itm2a antibody |
| WO2013047748A1 (en) | 2011-09-30 | 2013-04-04 | 中外製薬株式会社 | Antigen-binding molecule promoting disappearance of antigens having plurality of biological activities |
| WO2015046467A1 (en) | 2013-09-27 | 2015-04-02 | 中外製薬株式会社 | Method for producing polypeptide heteromultimer |
| US10670223B2 (en) | 2018-04-24 | 2020-06-02 | Nichia Corporation | Light emitting module |
| US10876705B2 (en) | 2018-04-24 | 2020-12-29 | Nichia Corporation | Light emitting module |
| WO2019225568A1 (en) | 2018-05-21 | 2019-11-28 | 中外製薬株式会社 | Lyophilized formulation sealed in glass vial |
| WO2020116636A1 (en) | 2018-12-07 | 2020-06-11 | 小野薬品工業株式会社 | Immunosuppressant |
| WO2023058723A1 (en) | 2021-10-08 | 2023-04-13 | 中外製薬株式会社 | Method for preparing prefilled syringe formulation |
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