JPS56165936A - Optical information reproducer - Google Patents
Optical information reproducerInfo
- Publication number
- JPS56165936A JPS56165936A JP6867380A JP6867380A JPS56165936A JP S56165936 A JPS56165936 A JP S56165936A JP 6867380 A JP6867380 A JP 6867380A JP 6867380 A JP6867380 A JP 6867380A JP S56165936 A JPS56165936 A JP S56165936A
- Authority
- JP
- Japan
- Prior art keywords
- waveguides
- information
- photodetectors
- floating head
- tracks
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
-
- 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
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To make construction simple and maintenance easy by projecting light spots to an optical information carrier by the use of waveguides, and allowing the waveguide for information detection to follow up information tracks according to the unbalance of the quantity of return light to the waveguides for deviation detection. CONSTITUTION:Beams of light from light sources 1a-1c respectively pass through condenser lenses 2, polarizers 3 and 1/4 wavelength plates 4, are conducted to a waveguide 5a for information detection and waveguides 5b, 5c for deviation detection, and are projected from a floating head 7 onto information tracks 6. The reflected beams thereof again pass through the waveguides 5a-5c, the 1/4 wavelength plates 4 and the polarizers 3 and enter photodetectors 8. Of the photodetectors 8, the outputs of the photodetectors 8b and 8c are inputted to a differential amplifier 9, the output whereof is inputted to an electrostrictive vibrator 10, then the floating head pressing member 12 mounted to the leading end of a connecting rod 12a is driven, by which a floating head 7 is vibrated in the direction intersecting orthogonally with the tracks 6 and the recording information is detected from the photodetector 8a.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6867380A JPS56165936A (en) | 1980-05-22 | 1980-05-22 | Optical information reproducer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6867380A JPS56165936A (en) | 1980-05-22 | 1980-05-22 | Optical information reproducer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56165936A true JPS56165936A (en) | 1981-12-19 |
Family
ID=13380460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6867380A Pending JPS56165936A (en) | 1980-05-22 | 1980-05-22 | Optical information reproducer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56165936A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5954046A (en) * | 1982-09-22 | 1984-03-28 | Canon Inc | Method and device for detecting focus |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5470004A (en) * | 1977-11-15 | 1979-06-05 | Toshiba Corp | Optical information reader |
-
1980
- 1980-05-22 JP JP6867380A patent/JPS56165936A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5470004A (en) * | 1977-11-15 | 1979-06-05 | Toshiba Corp | Optical information reader |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5954046A (en) * | 1982-09-22 | 1984-03-28 | Canon Inc | Method and device for detecting focus |
JPH0439131B2 (en) * | 1982-09-22 | 1992-06-26 |
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