JPS6446234A - Recording and reproducing device for optical information - Google Patents
Recording and reproducing device for optical informationInfo
- Publication number
- JPS6446234A JPS6446234A JP20085987A JP20085987A JPS6446234A JP S6446234 A JPS6446234 A JP S6446234A JP 20085987 A JP20085987 A JP 20085987A JP 20085987 A JP20085987 A JP 20085987A JP S6446234 A JPS6446234 A JP S6446234A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- optical card
- light
- auto
- variation
- 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 eliminate an unnecessary record on an optical card and to attain a high-speed access by moving an optical spot to a different position when the titled device stands idle in a condition where an AT and an AF operate, and the variation or the change ratio of a reflected light quantity or a transmitted light quantity from the optical card exceeds a set value. CONSTITUTION:An optical head 16 is composed of a semiconductor laser 11, a collimator lens 12, a beam splitter 13, an objective lens 14 and a photo detector 15. A focus control circuit 24 and a tracking control circuit 23 move the objective lens 14 in a light axis direction and a direction orthogonal to the light axis respectively, and execute the auto-focusing (AF) and the auto-tracking (AT). When the variation or the change ratio of the reflected light or the transmitted light exceeds the prescribed set value, irradiated light standing still on an optical information recording medium (optical card) 1 is moved to a new position. Thus, when the record of an unnecessary erroneous signal is not executed for the optical card 1, and the new recording and reproducing are executed, high-sped access is attained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20085987A JPS6446234A (en) | 1987-08-13 | 1987-08-13 | Recording and reproducing device for optical information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20085987A JPS6446234A (en) | 1987-08-13 | 1987-08-13 | Recording and reproducing device for optical information |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6446234A true JPS6446234A (en) | 1989-02-20 |
Family
ID=16431409
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20085987A Pending JPS6446234A (en) | 1987-08-13 | 1987-08-13 | Recording and reproducing device for optical information |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6446234A (en) |
-
1987
- 1987-08-13 JP JP20085987A patent/JPS6446234A/en active Pending
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