JPS5764337A - Track retrieval device - Google Patents
Track retrieval deviceInfo
- Publication number
- JPS5764337A JPS5764337A JP13816580A JP13816580A JPS5764337A JP S5764337 A JPS5764337 A JP S5764337A JP 13816580 A JP13816580 A JP 13816580A JP 13816580 A JP13816580 A JP 13816580A JP S5764337 A JPS5764337 A JP S5764337A
- Authority
- JP
- Japan
- Prior art keywords
- track
- difference signal
- photodetector
- disk
- tracking
- 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
- G11B7/08541—Methods for track change, selection or preliminary positioning by moving the head involving track counting to determine position
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
PURPOSE:To execute the retrieval at a high speed, by photodetecting a reflected ray from a groovelike guide track by a photodetector, detecting a retrieval crossing direction of the groovelike guide track by a difference signal of an output of the photodetector, a sum signal and a recording and reproducing signal, and counting the number of crossed tracks. CONSTITUTION:In case when the center of a track of a disk 3 is shifted, an optical spot 6 on the disk 3 does not follow a track exactly but crosses the track, and the optical distribution is varied on a photodetector 13. When this variation is detected and is inputted to a predifferential amplifier 19, a tracking difference signal 20 is obtained. This difference signal 20 is inputted to a driving circuit 21 and drives a tracking mirror 4. As for this mirror 4, its angle is varied in accordance with the difference signal so that the optical spot 6 exactly follows the track on the disk 3, and the tracking control is executed.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13816580A JPS5764337A (en) | 1980-10-01 | 1980-10-01 | Track retrieval device |
US06/301,420 US4484319A (en) | 1980-09-19 | 1981-09-11 | Apparatus for locating a track on disc-like optical information carriers |
DE8181107323T DE3175265D1 (en) | 1980-09-19 | 1981-09-16 | Track searching arrangement for an optical information recording and reproducing apparatus |
EP81107323A EP0048441B1 (en) | 1980-09-19 | 1981-09-16 | Track searching arrangement for an optical information recording and reproducing apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13816580A JPS5764337A (en) | 1980-10-01 | 1980-10-01 | Track retrieval device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5764337A true JPS5764337A (en) | 1982-04-19 |
JPS6236286B2 JPS6236286B2 (en) | 1987-08-06 |
Family
ID=15215538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13816580A Granted JPS5764337A (en) | 1980-09-19 | 1980-10-01 | Track retrieval device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5764337A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6224444A (en) * | 1985-07-25 | 1987-02-02 | Pioneer Electronic Corp | Device for detecting track crossing direction |
JPH01502629A (en) * | 1987-08-29 | 1989-09-07 | 富士通株式会社 | How to access optical recording tracks |
USRE36590E (en) * | 1987-08-29 | 2000-02-29 | Fujitsu Limited | Apparatus and method for accurately scanning a light beam across tracks of a recording medium |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0234786U (en) * | 1988-08-30 | 1990-03-06 | ||
JPH0345425U (en) * | 1989-09-11 | 1991-04-26 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51117005A (en) * | 1975-04-07 | 1976-10-14 | Hitachi Ltd | Tracking absorption equipment |
-
1980
- 1980-10-01 JP JP13816580A patent/JPS5764337A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51117005A (en) * | 1975-04-07 | 1976-10-14 | Hitachi Ltd | Tracking absorption equipment |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6224444A (en) * | 1985-07-25 | 1987-02-02 | Pioneer Electronic Corp | Device for detecting track crossing direction |
JPH0467692B2 (en) * | 1985-07-25 | 1992-10-29 | Pioneer Electronic Corp | |
JPH01502629A (en) * | 1987-08-29 | 1989-09-07 | 富士通株式会社 | How to access optical recording tracks |
USRE36590E (en) * | 1987-08-29 | 2000-02-29 | Fujitsu Limited | Apparatus and method for accurately scanning a light beam across tracks of a recording medium |
Also Published As
Publication number | Publication date |
---|---|
JPS6236286B2 (en) | 1987-08-06 |
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