JPS5894140U - Semiconductor laser light intensity drop display device - Google Patents
Semiconductor laser light intensity drop display deviceInfo
- Publication number
- JPS5894140U JPS5894140U JP18825681U JP18825681U JPS5894140U JP S5894140 U JPS5894140 U JP S5894140U JP 18825681 U JP18825681 U JP 18825681U JP 18825681 U JP18825681 U JP 18825681U JP S5894140 U JPS5894140 U JP S5894140U
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- display device
- laser light
- light intensity
- light amount
- 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
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Optical Head (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第1図は半導体レーザの電流−光出力の関係を示す特性
図、第2図は本考案に係る半導体レーザ光量低下表示装
置の一例を示す回路図、第3図は本考案に係る半導体レ
ーザ光量低下表示装置の他の例を示す回路図である。
図中、1は半導体レーザ、2はモニタm−ダイオード、
3はI/V変換回路(電流/電圧変換回路)、4は誤差
検出回路、5は電流制御回路、6゜18は比較回路、7
は表示回路、10は受光素子、15は加算回路、17は
積分回路である。Fig. 1 is a characteristic diagram showing the relationship between current and optical output of a semiconductor laser, Fig. 2 is a circuit diagram showing an example of a semiconductor laser light intensity reduction display device according to the present invention, and Fig. 3 is a semiconductor laser light intensity according to the present invention. FIG. 7 is a circuit diagram showing another example of a drop display device. In the figure, 1 is a semiconductor laser, 2 is a monitor m-diode,
3 is an I/V conversion circuit (current/voltage conversion circuit), 4 is an error detection circuit, 5 is a current control circuit, 6°18 is a comparison circuit, 7
1 is a display circuit, 10 is a light receiving element, 15 is an addition circuit, and 17 is an integration circuit.
Claims (1)
光量検出部と、該光量検出部の出力と所定の基準値とを
比較する比較部と、該比較部からの比較出力にもとずき
、上記光量が所定値以下に低下したことを表示する表示
部とからなる半導体レーザ光量低下表示装置。A light amount detection section that generates an output corresponding to the amount of light emitted by the semiconductor laser, a comparison section that compares the output of the light amount detection section with a predetermined reference value, and a comparison output based on the comparison output from the comparison section. , a semiconductor laser light amount reduction display device comprising: a display section that displays that the light amount has decreased to a predetermined value or less;
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18825681U JPS5894140U (en) | 1981-12-17 | 1981-12-17 | Semiconductor laser light intensity drop display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18825681U JPS5894140U (en) | 1981-12-17 | 1981-12-17 | Semiconductor laser light intensity drop display device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5894140U true JPS5894140U (en) | 1983-06-25 |
Family
ID=30102905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18825681U Pending JPS5894140U (en) | 1981-12-17 | 1981-12-17 | Semiconductor laser light intensity drop display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5894140U (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6022747A (en) * | 1983-07-19 | 1985-02-05 | Fujitsu Ten Ltd | Protecting circuit of laser pickup |
JPS6246581A (en) * | 1985-08-24 | 1987-02-28 | Fuji Electric Co Ltd | Laser irradiation device |
JPS6248118A (en) * | 1985-08-27 | 1987-03-02 | Omron Tateisi Electronics Co | Bias circuit of laser diode |
JPH05250715A (en) * | 1992-03-04 | 1993-09-28 | Fujitsu Ltd | Deciding method for life of laser light source |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5611631A (en) * | 1979-07-04 | 1981-02-05 | Hitachi Ltd | Optical recording and reproducing unit |
-
1981
- 1981-12-17 JP JP18825681U patent/JPS5894140U/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5611631A (en) * | 1979-07-04 | 1981-02-05 | Hitachi Ltd | Optical recording and reproducing unit |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6022747A (en) * | 1983-07-19 | 1985-02-05 | Fujitsu Ten Ltd | Protecting circuit of laser pickup |
JPS6246581A (en) * | 1985-08-24 | 1987-02-28 | Fuji Electric Co Ltd | Laser irradiation device |
JPS6248118A (en) * | 1985-08-27 | 1987-03-02 | Omron Tateisi Electronics Co | Bias circuit of laser diode |
JPH05250715A (en) * | 1992-03-04 | 1993-09-28 | Fujitsu Ltd | Deciding method for life of laser light source |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS59124370U (en) | Power-off detection circuit | |
JPS5894140U (en) | Semiconductor laser light intensity drop display device | |
JPS60167358U (en) | Semiconductor laser drive circuit | |
JPS5956930U (en) | power display device | |
JPS58175654U (en) | Automatic output control circuit for laser diode | |
JPS58106962U (en) | Laser diode drive circuit | |
JPS5954871U (en) | detection device | |
JPS59157238U (en) | Photocoupler device | |
JPS58187729U (en) | Liquid level display device | |
JPS5989203U (en) | Light emitting element sorting device | |
JPS5819567U (en) | High voltage control circuit for CRT | |
JPS59187773U (en) | Battery low voltage alarm circuit | |
JPS591141U (en) | Tape running display circuit | |
JPS59174713U (en) | Limiter circuit for operational amplifier | |
JPS60154872U (en) | Commercial power supply input detection circuit | |
JPS59147389U (en) | speaker device | |
JPS60105009U (en) | Lighting device for vehicle display device | |
JPS59118337U (en) | current source circuit | |
JPS60129615U (en) | Photoelectric detection device | |
JPS5879270U (en) | level display device | |
JPS59132136U (en) | Standby display circuit | |
JPS6110044U (en) | charging circuit | |
JPS6041988U (en) | DC-DC converter circuit for fluorescent display tube | |
JPS5849273U (en) | Semiconductor light emitting device tracer | |
JPS59173045U (en) | Integral circuit for strobe control |