JPS57150148A - Optical type recorder and reproducer - Google Patents
Optical type recorder and reproducerInfo
- Publication number
- JPS57150148A JPS57150148A JP3495981A JP3495981A JPS57150148A JP S57150148 A JPS57150148 A JP S57150148A JP 3495981 A JP3495981 A JP 3495981A JP 3495981 A JP3495981 A JP 3495981A JP S57150148 A JPS57150148 A JP S57150148A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- recording
- focus control
- recording disc
- converging
- 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
- G11B7/09—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
- G11B7/0945—Methods for initialising servos, start-up sequences
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
PURPOSE:To prevent the collision between a converging optical system and a recording disc and to give focus control on a recording surface surely, by giving a signal for braking to a driving element when a converging point of a light beam comes around a surface having information signals on a recording disc. CONSTITUTION:A reflected light of a beam converged on a recording surface of a recording disc 1 irradiates a 4-split photodetector 13, two portions of outputs are inputted to a differential amplifier 16 via synthesis circuits 14 and 15, and the outputs drive a converging lens driving element 21 via a compensation circuit 17, a gain converting circuit 18, a switch 19, and a driving circuit 20. If focus control is inoperative, a signal is given to a counter circuit 25 and an AND circuit 31 from an instruction generating circuit 26, and the counter circuit 25 counts 1 when the optical beam approaches the protective layer and the recording layer, and a comparison circuit 27 compares it with the 2 of a numeral setting circuit 28. If they are coincident, a switch circuit 19 is made inoperative via an AND circuit 31, and a brake signal from a brake signal generating circuit 33 is given to a driving circuit 20 to prevent the collision between a converging lens 9 and the recording disc 1 and perform the focus control on the recording film.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3495981A JPS57150148A (en) | 1981-03-10 | 1981-03-10 | Optical type recorder and reproducer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3495981A JPS57150148A (en) | 1981-03-10 | 1981-03-10 | Optical type recorder and reproducer |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57150148A true JPS57150148A (en) | 1982-09-16 |
JPH0470697B2 JPH0470697B2 (en) | 1992-11-11 |
Family
ID=12428680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3495981A Granted JPS57150148A (en) | 1981-03-10 | 1981-03-10 | Optical type recorder and reproducer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57150148A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60251529A (en) * | 1984-05-25 | 1985-12-12 | Sony Corp | Optical disk player |
JPS63129525A (en) * | 1986-11-19 | 1988-06-01 | Matsushita Graphic Commun Syst Inc | Focus servo device for optical disk device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5538639A (en) * | 1978-09-07 | 1980-03-18 | Pioneer Video Corp | Servo drawing-in unit for focus lens of optical information reader |
-
1981
- 1981-03-10 JP JP3495981A patent/JPS57150148A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5538639A (en) * | 1978-09-07 | 1980-03-18 | Pioneer Video Corp | Servo drawing-in unit for focus lens of optical information reader |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60251529A (en) * | 1984-05-25 | 1985-12-12 | Sony Corp | Optical disk player |
JPH0473219B2 (en) * | 1984-05-25 | 1992-11-20 | Sony Corp | |
JPS63129525A (en) * | 1986-11-19 | 1988-06-01 | Matsushita Graphic Commun Syst Inc | Focus servo device for optical disk device |
Also Published As
Publication number | Publication date |
---|---|
JPH0470697B2 (en) | 1992-11-11 |
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