JPS6450247A - Optical disk recording and reproducing device - Google Patents
Optical disk recording and reproducing deviceInfo
- Publication number
- JPS6450247A JPS6450247A JP20725387A JP20725387A JPS6450247A JP S6450247 A JPS6450247 A JP S6450247A JP 20725387 A JP20725387 A JP 20725387A JP 20725387 A JP20725387 A JP 20725387A JP S6450247 A JPS6450247 A JP S6450247A
- Authority
- JP
- Japan
- Prior art keywords
- control means
- gain control
- optical disk
- recording
- reproducing device
- 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
Abstract
PURPOSE:To stably perform tracking control at the time of recording, by providing a first gain control means and a second gain control means which change the levels of the detecting signals of two sub laser beams detected by a three- beam method. CONSTITUTION:The two sub laser beams reflected on an optical disk are detected by the photodetectors 3a and 3b of an optical detector 3 of sexenary split, and a signal obtained at a first detection amplifier circuit 10 is inputted to the first gain control means 12, and the signal obtained at a second detection amplifier circuit 11 is inputted to the second gain control means 13. Those first and second gain control means 12 and 13 change the gains of input signals by the ratios of resistors 12a and 13a, and variable resistors 12b and 13b, respectively, when switching means 12c and 13c are turned ON by a control signal from a CPU that is the control part of an optical disk recording and reproducing device. In such a way, it is possible to set the levels of two detecting signals at the same level in a recording and a reproducing operations, thereby, stable tracking control can be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20725387A JPS6450247A (en) | 1987-08-20 | 1987-08-20 | Optical disk recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20725387A JPS6450247A (en) | 1987-08-20 | 1987-08-20 | Optical disk recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6450247A true JPS6450247A (en) | 1989-02-27 |
Family
ID=16536744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20725387A Pending JPS6450247A (en) | 1987-08-20 | 1987-08-20 | Optical disk recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6450247A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01263946A (en) * | 1988-04-14 | 1989-10-20 | Canon Inc | Tracking mechanism for optical information recording/ reproducing device |
| JPH0388134A (en) * | 1989-08-30 | 1991-04-12 | Alpine Electron Inc | Adjusting method for tracking servo system |
| US5754523A (en) * | 1987-11-18 | 1998-05-19 | Sharp Kabushiki Kaisha | Optical memory medium with preformed pit arrangement |
| WO2003107336A1 (en) * | 2002-06-12 | 2003-12-24 | Koninklijke Philips Electronics N.V. | Optical scanning device |
| US7545709B2 (en) * | 2004-11-04 | 2009-06-09 | Funai Electric Co., Ltd. | Optical disk apparatus having servo parameter setting unit |
-
1987
- 1987-08-20 JP JP20725387A patent/JPS6450247A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5754523A (en) * | 1987-11-18 | 1998-05-19 | Sharp Kabushiki Kaisha | Optical memory medium with preformed pit arrangement |
| JPH01263946A (en) * | 1988-04-14 | 1989-10-20 | Canon Inc | Tracking mechanism for optical information recording/ reproducing device |
| JPH0388134A (en) * | 1989-08-30 | 1991-04-12 | Alpine Electron Inc | Adjusting method for tracking servo system |
| WO2003107336A1 (en) * | 2002-06-12 | 2003-12-24 | Koninklijke Philips Electronics N.V. | Optical scanning device |
| US7545709B2 (en) * | 2004-11-04 | 2009-06-09 | Funai Electric Co., Ltd. | Optical disk apparatus having servo parameter setting unit |
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