JPS57198547A - Optical information processor - Google Patents
Optical information processorInfo
- Publication number
- JPS57198547A JPS57198547A JP8197081A JP8197081A JPS57198547A JP S57198547 A JPS57198547 A JP S57198547A JP 8197081 A JP8197081 A JP 8197081A JP 8197081 A JP8197081 A JP 8197081A JP S57198547 A JPS57198547 A JP S57198547A
- Authority
- JP
- Japan
- Prior art keywords
- split detectors
- larger
- focusing
- couple
- detector
- 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 obtain a focusing signal and a tracking signal by arranging two photodetecting elements at a center part and two larger photodetecting elements on both sides in front of or behind an imaging position, and then processing their outputs by adding and subtraction. CONSTITUTION:A detector 8 consists of a couple of split detectors 8a and 8b having large photodetection surfaces on both sides, and a couple of split detectors 8c and 8d having small photodetection surfaces at the center part, and their boundary directions coincide with each other. In this case, the sum of outputs of the two center split detectors 8c and 8d is equal to that of the two both-side split detectors 8a and 8b at a focusing position. As a disck deviates from a focusing state and moves away from an objective lens, a light spot on the detector 8 becomes smaller, and as the disk comes closer and closer to the lens, the spot becomes larger and larger. Thus, the output difference VF is obtained correspondingly. The VT includes a track shift signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8197081A JPS57198547A (en) | 1981-05-28 | 1981-05-28 | Optical information processor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8197081A JPS57198547A (en) | 1981-05-28 | 1981-05-28 | Optical information processor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57198547A true JPS57198547A (en) | 1982-12-06 |
JPS6149728B2 JPS6149728B2 (en) | 1986-10-30 |
Family
ID=13761346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8197081A Granted JPS57198547A (en) | 1981-05-28 | 1981-05-28 | Optical information processor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57198547A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59215029A (en) * | 1983-05-20 | 1984-12-04 | Sankyo Seiki Mfg Co Ltd | Optical information reproducing device |
US4546460A (en) * | 1981-10-22 | 1985-10-08 | Tokyo Shibaura Denki Kabushiki Kaisha | Videodisc autofocus device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5644126A (en) * | 1979-09-19 | 1981-04-23 | Sony Corp | Optical signal head |
-
1981
- 1981-05-28 JP JP8197081A patent/JPS57198547A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5644126A (en) * | 1979-09-19 | 1981-04-23 | Sony Corp | Optical signal head |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4546460A (en) * | 1981-10-22 | 1985-10-08 | Tokyo Shibaura Denki Kabushiki Kaisha | Videodisc autofocus device |
JPS59215029A (en) * | 1983-05-20 | 1984-12-04 | Sankyo Seiki Mfg Co Ltd | Optical information reproducing device |
Also Published As
Publication number | Publication date |
---|---|
JPS6149728B2 (en) | 1986-10-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR840004972A (en) | Photoelectric Focusing Error Detection Device | |
JPS5576312A (en) | Focus detecting system of image | |
KR840007956A (en) | Focus error detector | |
JPS53110823A (en) | Optical information processor | |
KR870004425A (en) | Read-write apparatus of optical information structure mounted in track direction | |
DE3166473D1 (en) | Focus detector | |
KR850000078A (en) | Focus error detector | |
JPS5295221A (en) | Detector for focusing | |
JPS57198547A (en) | Optical information processor | |
JPS5689005A (en) | Position detector | |
JPS6155047B2 (en) | ||
JPS5744236A (en) | Optical information reproducer | |
JPS57105832A (en) | Detector for optical position | |
DE3873973D1 (en) | DEVICE FOR PLAYING BACK DATA. | |
JPS54102107A (en) | Control information detecting method | |
JPS57205832A (en) | Out-of-focus detecting method | |
JPS5644128A (en) | Optical pickup | |
JPS5525853A (en) | Tracking device for optical information track | |
JPS573234A (en) | Optical recorder and reproducer | |
JPS5570942A (en) | Tracking error detector | |
JPS57103008A (en) | Optical position detector | |
JPS5744235A (en) | Optical information recorder and reproducer | |
JPS54104302A (en) | Focus position detecting system | |
JPS5766535A (en) | Focus detector | |
JPS5774841A (en) | Control signal detector of optical information reader |