JPS57191839A - Information reader - Google Patents
Information readerInfo
- Publication number
- JPS57191839A JPS57191839A JP56076346A JP7634681A JPS57191839A JP S57191839 A JPS57191839 A JP S57191839A JP 56076346 A JP56076346 A JP 56076346A JP 7634681 A JP7634681 A JP 7634681A JP S57191839 A JPS57191839 A JP S57191839A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- axis
- couple
- depth
- disk
- 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
- G11B7/0901—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 track following only
- G11B7/0906—Differential phase difference systems
-
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56076346A JPS57191839A (en) | 1981-05-20 | 1981-05-20 | Information reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56076346A JPS57191839A (en) | 1981-05-20 | 1981-05-20 | Information reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57191839A true JPS57191839A (en) | 1982-11-25 |
Family
ID=13602792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56076346A Pending JPS57191839A (en) | 1981-05-20 | 1981-05-20 | Information reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57191839A (ja) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1986005914A1 (en) * | 1985-04-05 | 1986-10-09 | Sony Corporation | Tracking error detecting apparatus for optical disks |
| JPH07296395A (ja) * | 1994-04-27 | 1995-11-10 | Victor Co Of Japan Ltd | 情報再生装置のトラッキング信号検出方法 |
| US8085637B2 (en) | 2008-09-30 | 2011-12-27 | Sony Corporation | Tracking error signal detection apparatus and optical disc apparatus |
-
1981
- 1981-05-20 JP JP56076346A patent/JPS57191839A/ja active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1986005914A1 (en) * | 1985-04-05 | 1986-10-09 | Sony Corporation | Tracking error detecting apparatus for optical disks |
| JPH07296395A (ja) * | 1994-04-27 | 1995-11-10 | Victor Co Of Japan Ltd | 情報再生装置のトラッキング信号検出方法 |
| US8085637B2 (en) | 2008-09-30 | 2011-12-27 | Sony Corporation | Tracking error signal detection apparatus and optical disc apparatus |
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