JPS57167146A - Information signal reproducing device - Google Patents
Information signal reproducing deviceInfo
- Publication number
- JPS57167146A JPS57167146A JP56051956A JP5195681A JPS57167146A JP S57167146 A JPS57167146 A JP S57167146A JP 56051956 A JP56051956 A JP 56051956A JP 5195681 A JP5195681 A JP 5195681A JP S57167146 A JPS57167146 A JP S57167146A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- optical axis
- disc
- focus error
- 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
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
-
- 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
-
- 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
-
- 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
- G11B7/0917—Focus-error methods other than those covered by G11B7/0909 - G11B7/0916
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
- Focusing (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56051956A JPS57167146A (en) | 1981-04-07 | 1981-04-07 | Information signal reproducing device |
US06/367,035 US4504938A (en) | 1981-04-07 | 1982-04-07 | Device for feedback controlling focus of an optical system in an information recording/reproducing apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56051956A JPS57167146A (en) | 1981-04-07 | 1981-04-07 | Information signal reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57167146A true JPS57167146A (en) | 1982-10-14 |
JPS6161446B2 JPS6161446B2 (ja) | 1986-12-25 |
Family
ID=12901316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56051956A Granted JPS57167146A (en) | 1981-04-07 | 1981-04-07 | Information signal reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57167146A (ja) |
-
1981
- 1981-04-07 JP JP56051956A patent/JPS57167146A/ja active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6161446B2 (ja) | 1986-12-25 |
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