JPS5553776A - Optical information reading method - Google Patents
Optical information reading methodInfo
- Publication number
- JPS5553776A JPS5553776A JP12655378A JP12655378A JPS5553776A JP S5553776 A JPS5553776 A JP S5553776A JP 12655378 A JP12655378 A JP 12655378A JP 12655378 A JP12655378 A JP 12655378A JP S5553776 A JPS5553776 A JP S5553776A
- Authority
- JP
- Japan
- Prior art keywords
- laser
- disk
- intensity change
- semiconductor
- radiated
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Semiconductor Lasers (AREA)
Abstract
PURPOSE: To secure detection of the light intensity change in the specific mode by irradiating the laser beam radiated from the semiconductor laser to the information carrier and then returning the reflection light to the active layer of the semiconductor.
CONSTITUTION: Radiation laser beams 3 given from semiconductor laser 2 which is driven by power source 1 are focused on disk 10 recording the information to be read out via focusing optical system 4, and the laser beams reflected on disk 10 are focused again through system 4 to be used as feedback beam 6. This beam 6 is returned to the active layer of laser 2 to be then radiated through the emission end face of the other side of laser 2. And laser beam 11 is given to wavelength separator 12. Separator 12 detects partial vertical mode beam 13, and the intensity change of beam 13 is detected by optical detector 14. Then the intensity of beam 6 is modulated based on the pattern information recorded on disk 10, thus ensuring an easy detection for the light intensity change in the specific mode.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12655378A JPS5553776A (en) | 1978-10-13 | 1978-10-13 | Optical information reading method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12655378A JPS5553776A (en) | 1978-10-13 | 1978-10-13 | Optical information reading method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5553776A true JPS5553776A (en) | 1980-04-19 |
| JPS6136298B2 JPS6136298B2 (en) | 1986-08-18 |
Family
ID=14938010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12655378A Granted JPS5553776A (en) | 1978-10-13 | 1978-10-13 | Optical information reading method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5553776A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5792438A (en) * | 1980-11-28 | 1982-06-09 | Ricoh Co Ltd | Recording method by laser beam |
| JPS60147670A (en) * | 1984-01-06 | 1985-08-03 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Self-detection type light-emitting diode proximity sensor |
| JPS60256079A (en) * | 1984-06-01 | 1985-12-17 | Sharp Corp | Minute displacement measuring apparatus using semiconductor laser |
-
1978
- 1978-10-13 JP JP12655378A patent/JPS5553776A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5792438A (en) * | 1980-11-28 | 1982-06-09 | Ricoh Co Ltd | Recording method by laser beam |
| JPH0213372B2 (en) * | 1980-11-28 | 1990-04-04 | Ricoh Kk | |
| JPS60147670A (en) * | 1984-01-06 | 1985-08-03 | インタ−ナショナル ビジネス マシ−ンズ コ−ポレ−ション | Self-detection type light-emitting diode proximity sensor |
| JPH031625B2 (en) * | 1984-01-06 | 1991-01-11 | Intaanashonaru Bijinesu Mashiinzu Corp | |
| JPS60256079A (en) * | 1984-06-01 | 1985-12-17 | Sharp Corp | Minute displacement measuring apparatus using semiconductor laser |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6136298B2 (en) | 1986-08-18 |
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