JPS6476424A - Overwrite detecting system for optical disk device - Google Patents
Overwrite detecting system for optical disk deviceInfo
- Publication number
- JPS6476424A JPS6476424A JP23244487A JP23244487A JPS6476424A JP S6476424 A JPS6476424 A JP S6476424A JP 23244487 A JP23244487 A JP 23244487A JP 23244487 A JP23244487 A JP 23244487A JP S6476424 A JPS6476424 A JP S6476424A
- Authority
- JP
- Japan
- Prior art keywords
- overwrite
- intensity
- write
- optical disk
- reflected light
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To simultaneously write and detect overwrite detection information by detecting overwrite of data with the reflected light of the light which is projected to an overwrite detection information storage area and has an intensity for write. CONSTITUTION:In case of write to the overwrite detection information storage area where detection information is stored, the reflectivity is changed. Then, a phase changing medium is used to increase the intensity of the light for write. The reflected light of the laser light, which has the intensity for write, from the surface of an optical disk of an optical disk device is inputted to a reflected light detector 1. The detector 1 outputs an electric signal which has a level corresponding to the intensity of the reflected light, and this signal is inputted to a comparator 2. The comparator 2 compares this electric signal with a prescribed threshold to output an overwrite detection signal. Since this detection signal has the intensity for overwrite, detection and overwrite are simultaneously performed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23244487A JPS6476424A (en) | 1987-09-18 | 1987-09-18 | Overwrite detecting system for optical disk device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23244487A JPS6476424A (en) | 1987-09-18 | 1987-09-18 | Overwrite detecting system for optical disk device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6476424A true JPS6476424A (en) | 1989-03-22 |
Family
ID=16939369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23244487A Pending JPS6476424A (en) | 1987-09-18 | 1987-09-18 | Overwrite detecting system for optical disk device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6476424A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03116533A (en) * | 1989-09-29 | 1991-05-17 | Toshiba Corp | Optical disk device |
JPH03116534A (en) * | 1989-09-29 | 1991-05-17 | Toshiba Corp | Optical disk device |
-
1987
- 1987-09-18 JP JP23244487A patent/JPS6476424A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03116533A (en) * | 1989-09-29 | 1991-05-17 | Toshiba Corp | Optical disk device |
JPH03116534A (en) * | 1989-09-29 | 1991-05-17 | Toshiba Corp | Optical disk device |
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