JPS57133526A - Processor of optical information - Google Patents
Processor of optical informationInfo
- Publication number
- JPS57133526A JPS57133526A JP1857781A JP1857781A JPS57133526A JP S57133526 A JPS57133526 A JP S57133526A JP 1857781 A JP1857781 A JP 1857781A JP 1857781 A JP1857781 A JP 1857781A JP S57133526 A JPS57133526 A JP S57133526A
- Authority
- JP
- Japan
- Prior art keywords
- bit
- detectors
- gets out
- focus
- light
- 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
Abstract
PURPOSE:To realize both the focus control and the tracking control through a simple optical system, by using a detecting system comprising a split prism and two sets of 2-split photodetectors put close to each other. CONSTITUTION:When a disk gets out of focus, an image formed by the light flux passed through a wedge-shaped prism 7a gets out of the bordr between detectors A and B to produce a difference between the light volumes to be made incident to those detectors A and B. In the same way, a difference is also produced to the light volumes which are made incident to the detectors A and B through a wedge-shaped prism 7b. The signals of adverse codes to each other are detected at the disk position centering on an in-focus position by an operation of A-B+D-C. When the bit center gets out of the spot light center, the signals of adverse codes to each other are obtained at the bit position, i.e., the track position centering on a coincident state between the bit cetner and the spot light center due to an operation of A+B-C-D as well as the diffraction of the bit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1857781A JPS57133526A (en) | 1981-02-10 | 1981-02-10 | Processor of optical information |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1857781A JPS57133526A (en) | 1981-02-10 | 1981-02-10 | Processor of optical information |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57133526A true JPS57133526A (en) | 1982-08-18 |
JPS6223373B2 JPS6223373B2 (en) | 1987-05-22 |
Family
ID=11975472
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1857781A Granted JPS57133526A (en) | 1981-02-10 | 1981-02-10 | Processor of optical information |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57133526A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0164687A2 (en) * | 1984-06-12 | 1985-12-18 | Kabushiki Kaisha Toshiba | Optical head for focusing a light beam on an optical disk |
JPS63279439A (en) * | 1987-05-12 | 1988-11-16 | Matsushita Electric Ind Co Ltd | Optical head |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54104303A (en) * | 1978-02-02 | 1979-08-16 | Victor Co Of Japan Ltd | Optical system signal reading system |
JPS55139642A (en) * | 1979-04-18 | 1980-10-31 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
-
1981
- 1981-02-10 JP JP1857781A patent/JPS57133526A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54104303A (en) * | 1978-02-02 | 1979-08-16 | Victor Co Of Japan Ltd | Optical system signal reading system |
JPS55139642A (en) * | 1979-04-18 | 1980-10-31 | Matsushita Electric Ind Co Ltd | Optical information recording and reproducing device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0164687A2 (en) * | 1984-06-12 | 1985-12-18 | Kabushiki Kaisha Toshiba | Optical head for focusing a light beam on an optical disk |
JPS63279439A (en) * | 1987-05-12 | 1988-11-16 | Matsushita Electric Ind Co Ltd | Optical head |
Also Published As
Publication number | Publication date |
---|---|
JPS6223373B2 (en) | 1987-05-22 |
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