JPS6161238A - フオ−カス引き込み方式 - Google Patents
フオ−カス引き込み方式Info
- Publication number
- JPS6161238A JPS6161238A JP18321184A JP18321184A JPS6161238A JP S6161238 A JPS6161238 A JP S6161238A JP 18321184 A JP18321184 A JP 18321184A JP 18321184 A JP18321184 A JP 18321184A JP S6161238 A JPS6161238 A JP S6161238A
- Authority
- JP
- Japan
- Prior art keywords
- focus
- error signal
- signal
- condenser lens
- detector
- 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
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
- G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
- G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only
Landscapes
- Automatic Focus Adjustment (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18321184A JPS6161238A (ja) | 1984-08-31 | 1984-08-31 | フオ−カス引き込み方式 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18321184A JPS6161238A (ja) | 1984-08-31 | 1984-08-31 | フオ−カス引き込み方式 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6161238A true JPS6161238A (ja) | 1986-03-29 |
JPH0518183B2 JPH0518183B2 (de) | 1993-03-11 |
Family
ID=16131721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18321184A Granted JPS6161238A (ja) | 1984-08-31 | 1984-08-31 | フオ−カス引き込み方式 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6161238A (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61158035A (ja) * | 1984-12-28 | 1986-07-17 | Ricoh Co Ltd | 光情報検出装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5885940A (ja) * | 1981-11-17 | 1983-05-23 | Hitachi Ltd | 光デイスクの自動焦点引込み方法 |
JPS6035337A (ja) * | 1983-08-03 | 1985-02-23 | Sony Corp | 光記録/再生装置 |
-
1984
- 1984-08-31 JP JP18321184A patent/JPS6161238A/ja active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5885940A (ja) * | 1981-11-17 | 1983-05-23 | Hitachi Ltd | 光デイスクの自動焦点引込み方法 |
JPS6035337A (ja) * | 1983-08-03 | 1985-02-23 | Sony Corp | 光記録/再生装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61158035A (ja) * | 1984-12-28 | 1986-07-17 | Ricoh Co Ltd | 光情報検出装置 |
Also Published As
Publication number | Publication date |
---|---|
JPH0518183B2 (de) | 1993-03-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term |