JPS57191835A - Optical information reader - Google Patents
Optical information readerInfo
- Publication number
- JPS57191835A JPS57191835A JP56075502A JP7550281A JPS57191835A JP S57191835 A JPS57191835 A JP S57191835A JP 56075502 A JP56075502 A JP 56075502A JP 7550281 A JP7550281 A JP 7550281A JP S57191835 A JPS57191835 A JP S57191835A
- Authority
- JP
- Japan
- Prior art keywords
- photodetectors
- diffracted
- light
- spot light
- shifted
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56075502A JPS57191835A (en) | 1981-05-19 | 1981-05-19 | Optical information reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56075502A JPS57191835A (en) | 1981-05-19 | 1981-05-19 | Optical information reader |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57191835A true JPS57191835A (en) | 1982-11-25 |
Family
ID=13578086
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56075502A Pending JPS57191835A (en) | 1981-05-19 | 1981-05-19 | Optical information reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57191835A (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59185047A (ja) * | 1983-04-05 | 1984-10-20 | Pioneer Electronic Corp | 記録情報読取装置 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5128720A (ja) * | 1974-09-04 | 1976-03-11 | Mitsubishi Electric Corp |
-
1981
- 1981-05-19 JP JP56075502A patent/JPS57191835A/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5128720A (ja) * | 1974-09-04 | 1976-03-11 | Mitsubishi Electric Corp |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59185047A (ja) * | 1983-04-05 | 1984-10-20 | Pioneer Electronic Corp | 記録情報読取装置 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5016954A (en) | Optical pickup and hologram therefor | |
CA2007619A1 (en) | Optical pickup apparatus utilizing a diffraction device | |
JPS57147148A (en) | Information reproducer with magnetooptic system | |
AU538975B2 (en) | Focus detector | |
GB1522346A (en) | Optical read-out system for video disc | |
JPS57191835A (en) | Optical information reader | |
JPS6455746A (en) | Optical pickup device | |
JPS5534340A (en) | Recording reproducing system by light beam | |
JPS6486337A (en) | Hologram | |
EP0390116A3 (en) | Optical information processing system | |
JPS57189348A (en) | Auto-focus system of optical disk | |
JPS54116904A (en) | Optical information reader | |
DE3873973D1 (de) | Geraet zur wiedergabe von daten. | |
JPS5647931A (en) | Optical recording and reproducing device | |
JPS5640A (en) | Optical information reproducing unit | |
JPS57164448A (en) | Position detecting device | |
JPS55157135A (en) | Information reader | |
JPS57133526A (en) | Processor of optical information | |
JPS5753839A (ja) | Kogakutekisaiseisochi | |
JPS5525853A (en) | Tracking device for optical information track | |
JPS55160335A (en) | Photodisk recorder | |
JPS57200961A (en) | Reader in optical magnetic disk recording and reproducing system | |
JPS5788533A (en) | Tracking error detector | |
JPS56105342A (en) | Optical pickup | |
JPS573234A (en) | Optical recorder and reproducer |