JPS57103130A - Focus controlling method of optical information recorder and reproducer - Google Patents
Focus controlling method of optical information recorder and reproducerInfo
- Publication number
- JPS57103130A JPS57103130A JP17826680A JP17826680A JPS57103130A JP S57103130 A JPS57103130 A JP S57103130A JP 17826680 A JP17826680 A JP 17826680A JP 17826680 A JP17826680 A JP 17826680A JP S57103130 A JPS57103130 A JP S57103130A
- Authority
- JP
- Japan
- Prior art keywords
- photoelectric detector
- split
- split photoelectric
- reflected light
- reproducer
- 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
- G11B7/0908—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 for focusing only
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To control a focal point without any influence of a polarization state, by splitting reflected light from a recording carrier into two accroding to a polarization direction, and by photodetecting two kinds of split reflected light by a two-split photoelectric detector. CONSTITUTION:In addition to a two-split photoelectric detector 7, another two- split photoelectric detector is provided; and a beam 11 obtained by splitting a beam into two beams 11 and 12 by a polarizing beam splitter 5 is photodetected by the two-split photoelectric detector 7 through a condenser lens 6, and the other beam 12 is also photodetected by the two-split photoelectric detector 10 through a reflecting plate 8 and a condenser lens 9 to obtain the sum of the differential outputs of the two-split photoelectric detectors 7 and 10 at two places as a focusing control signal for a stop-down lens 9. Thus, stable focusing control is exercised without being influence by the polarization state of the reflected light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17826680A JPS57103130A (en) | 1980-12-16 | 1980-12-16 | Focus controlling method of optical information recorder and reproducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17826680A JPS57103130A (en) | 1980-12-16 | 1980-12-16 | Focus controlling method of optical information recorder and reproducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57103130A true JPS57103130A (en) | 1982-06-26 |
Family
ID=16045474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17826680A Pending JPS57103130A (en) | 1980-12-16 | 1980-12-16 | Focus controlling method of optical information recorder and reproducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57103130A (en) |
-
1980
- 1980-12-16 JP JP17826680A patent/JPS57103130A/en active Pending
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