JPH042325U - - Google Patents
Info
- Publication number
- JPH042325U JPH042325U JP4097490U JP4097490U JPH042325U JP H042325 U JPH042325 U JP H042325U JP 4097490 U JP4097490 U JP 4097490U JP 4097490 U JP4097490 U JP 4097490U JP H042325 U JPH042325 U JP H042325U
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- optical output
- drive circuit
- signal reading
- laser drive
- 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.)
- Granted
Links
- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Optical Head (AREA)
Description
第１図は本考案の一実施例を示す回路図、第２
図は従来例を示す回路図、第３図は半導体レーザ
の光出力波形図である。
１……半導体レーザ、２……フオトダイオード
、３……高周波重畳回路、５……コンパレータ、
６……スイツチング用トランジスタ、３ａ……増
幅素子、３ｂ……高周波発振器。
Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a circuit diagram showing a conventional example, and FIG. 3 is an optical output waveform diagram of a semiconductor laser. 1...Semiconductor laser, 2...Photodiode, 3...High frequency superimposition circuit, 5...Comparator,
6... Switching transistor, 3a... Amplifying element, 3b... High frequency oscillator.
Claims (1)
の光源として使用する半導体レーザ駆動回路にお
いて、半導体レーザの光出力レベルを検出する手
段、該光出力の検出レベルに応じ信号読みとり時
の高周波重畳をスイツチングする手段とを備えて
なることを特徴とする半導体レーザ駆動回路。 A semiconductor laser drive circuit that uses a semiconductor laser as a light source for signal reading and signal writing includes means for detecting the optical output level of the semiconductor laser, and means for switching high frequency superimposition during signal reading according to the detected level of the optical output. A semiconductor laser drive circuit comprising:
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4097490U JP2515320Y2 (en) | 1990-04-17 | 1990-04-17 | Semiconductor laser drive circuit |
| US07/686,783 US5127015A (en) | 1990-04-17 | 1991-04-17 | Driving circuit of a semiconductor laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4097490U JP2515320Y2 (en) | 1990-04-17 | 1990-04-17 | Semiconductor laser drive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH042325U true JPH042325U (en) | 1992-01-09 |
| JP2515320Y2 JP2515320Y2 (en) | 1996-10-30 |
Family
ID=31551240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4097490U Expired - Fee Related JP2515320Y2 (en) | 1990-04-17 | 1990-04-17 | Semiconductor laser drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2515320Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3115919U (en) | 2005-01-26 | 2005-11-24 | 海藍星科技股▲ふん▼有限公司 | Xenon lamp low-high beam switching control circuit |
-
1990
- 1990-04-17 JP JP4097490U patent/JP2515320Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2515320Y2 (en) | 1996-10-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |