JPS5755568A - Recording and reproducing device - Google Patents
Recording and reproducing deviceInfo
- Publication number
- JPS5755568A JPS5755568A JP13081280A JP13081280A JPS5755568A JP S5755568 A JPS5755568 A JP S5755568A JP 13081280 A JP13081280 A JP 13081280A JP 13081280 A JP13081280 A JP 13081280A JP S5755568 A JPS5755568 A JP S5755568A
- Authority
- JP
- Japan
- Prior art keywords
- detection
- track crossing
- stand
- lens
- crossing signal
- 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
Abstract
PURPOSE:To detect an accurate track crossing signal for a device that performs the recording and reproducing over plural tracks, by varying the time constant of a track crossing detecting circuit. CONSTITUTION:For an optical recorder and reproducer, a light beam 2 sent from a beam source 1 is focused on a disk-shaped recording medium 7 via a lens 3, a semitransparent mirror 4, a reflector 5 and a focusing lens 6; and the reflected light is applied to a photodetector 8 via a lens 6, the reflector 5 and the mirror 4. In such way, the recorded information is read. When a desired track on a recording medium 7 is retrieved, an output is obtained from a track crossing signal producing circuit 30 that shifts a shift stand 20. The signal waveform differs by the shifting speed of the stand 20. In this connection, a shift speed detection 21 is carried out for the stand 20, and the time constant is varied for the detection of waveform of the circuit 30 in accordance with the output of the detection 21. As a result, the detection is possible for the accurate track crossing signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13081280A JPS5755568A (en) | 1980-09-22 | 1980-09-22 | Recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13081280A JPS5755568A (en) | 1980-09-22 | 1980-09-22 | Recording and reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5755568A true JPS5755568A (en) | 1982-04-02 |
JPH0359508B2 JPH0359508B2 (en) | 1991-09-10 |
Family
ID=15043280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13081280A Granted JPS5755568A (en) | 1980-09-22 | 1980-09-22 | Recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5755568A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59107462A (en) * | 1982-12-09 | 1984-06-21 | Mitsubishi Electric Corp | Memory |
JPS59107463A (en) * | 1982-12-09 | 1984-06-21 | Mitsubishi Electric Corp | Memory |
JPS59231777A (en) * | 1983-06-13 | 1984-12-26 | Matsushita Electric Ind Co Ltd | Inter-track detector |
JPS60121577A (en) * | 1983-12-02 | 1985-06-29 | Matsushita Electric Ind Co Ltd | Retrieving device of information track |
EP0296338A2 (en) * | 1987-06-25 | 1988-12-28 | Mitsubishi Denki Kabushiki Kaisha | Optical disc system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53126906A (en) * | 1977-04-12 | 1978-11-06 | Ibm | Data storage |
JPS573267A (en) * | 1980-06-09 | 1982-01-08 | Nec Corp | Position signal reproduction system of positioning controller for magnetic head |
-
1980
- 1980-09-22 JP JP13081280A patent/JPS5755568A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53126906A (en) * | 1977-04-12 | 1978-11-06 | Ibm | Data storage |
JPS573267A (en) * | 1980-06-09 | 1982-01-08 | Nec Corp | Position signal reproduction system of positioning controller for magnetic head |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59107462A (en) * | 1982-12-09 | 1984-06-21 | Mitsubishi Electric Corp | Memory |
JPS59107463A (en) * | 1982-12-09 | 1984-06-21 | Mitsubishi Electric Corp | Memory |
JPS59231777A (en) * | 1983-06-13 | 1984-12-26 | Matsushita Electric Ind Co Ltd | Inter-track detector |
JPH0241820B2 (en) * | 1983-06-13 | 1990-09-19 | ||
JPS60121577A (en) * | 1983-12-02 | 1985-06-29 | Matsushita Electric Ind Co Ltd | Retrieving device of information track |
EP0296338A2 (en) * | 1987-06-25 | 1988-12-28 | Mitsubishi Denki Kabushiki Kaisha | Optical disc system |
Also Published As
Publication number | Publication date |
---|---|
JPH0359508B2 (en) | 1991-09-10 |
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