JPS6450240A - Optical disk device - Google Patents
Optical disk deviceInfo
- Publication number
- JPS6450240A JPS6450240A JP62206970A JP20697087A JPS6450240A JP S6450240 A JPS6450240 A JP S6450240A JP 62206970 A JP62206970 A JP 62206970A JP 20697087 A JP20697087 A JP 20697087A JP S6450240 A JPS6450240 A JP S6450240A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- focus error
- leakage signal
- circuit
- leakage
- 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
Abstract
PURPOSE:To prevent a focus error from being generated, by controlling a blind sector circuit which eliminates a leakage signal based on the signal level of the leakage signal mixed in a focus error signal. CONSTITUTION:The blind sector circuit 23 which suppresses a voltage by prescribed ranges of VF1 and VF2 setting a hold voltage VH held at a hold circuit 16 and outputs it as the input voltage VH of the hold circuit 16, leakage signal detection circuits 32, 33, 40, and 43 which detect the signal level VC of the leakage signal SM1 modulated by a pre-group from the focus error signal SFE1, blind sector width control circuits 25, 26, 48, and 57 which control the range VF1 and VF2 of the signal level are provided. By controlling the signal levels VF1 and VF2 suppressed by the blind sector circuit 23 based on the detected result of the leakage signal, it is possible to prevent the focus error from being generated by eliminating the leakage signal mixed in the focus error signal.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62206970A JP2565233B2 (en) | 1987-08-20 | 1987-08-20 | Optical disk device |
US07/171,256 US5003523A (en) | 1987-03-25 | 1988-03-21 | Apparatus for recording and reproducing information on an optical disk with a focus servo system for avoiding influence of traverse signal during search |
EP88302578A EP0284377B1 (en) | 1987-03-25 | 1988-03-24 | Optical disc recording and/or reproducing apparatus and focus control systems for such apparatus |
DE88302578T DE3885131T2 (en) | 1987-03-25 | 1988-03-24 | Optical disc recording or reproducing apparatus and focus control systems therefor. |
AT88302578T ATE96568T1 (en) | 1987-03-25 | 1988-03-24 | OPTICAL DISC RECORDER OR PLAYBACK DEVICE AND FOCUS CONTROL SYSTEMS THEREOF. |
KR1019880003211A KR960011789B1 (en) | 1987-03-25 | 1988-03-25 | Optical disk recording & reproducing apparatus |
HK119895A HK119895A (en) | 1987-03-25 | 1995-07-20 | Optical disc recording and/or reproducing apparatus and focus control systems for such apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62206970A JP2565233B2 (en) | 1987-08-20 | 1987-08-20 | Optical disk device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6450240A true JPS6450240A (en) | 1989-02-27 |
JP2565233B2 JP2565233B2 (en) | 1996-12-18 |
Family
ID=16532019
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62206970A Expired - Fee Related JP2565233B2 (en) | 1987-03-25 | 1987-08-20 | Optical disk device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2565233B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8130602B2 (en) | 2009-05-29 | 2012-03-06 | Hitachi-Lg Data Storage, Inc. | Optical disk drive |
-
1987
- 1987-08-20 JP JP62206970A patent/JP2565233B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8130602B2 (en) | 2009-05-29 | 2012-03-06 | Hitachi-Lg Data Storage, Inc. | Optical disk drive |
Also Published As
Publication number | Publication date |
---|---|
JP2565233B2 (en) | 1996-12-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |