JPS6413274A - Optical disk device - Google Patents
Optical disk deviceInfo
- Publication number
- JPS6413274A JPS6413274A JP16945987A JP16945987A JPS6413274A JP S6413274 A JPS6413274 A JP S6413274A JP 16945987 A JP16945987 A JP 16945987A JP 16945987 A JP16945987 A JP 16945987A JP S6413274 A JPS6413274 A JP S6413274A
- Authority
- JP
- Japan
- Prior art keywords
- address
- signal
- track
- track address
- speed
- 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
Landscapes
- Moving Of The Head To Find And Align With The Track (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
PURPOSE:To surely execute pull-in operation by suitably receiving a track address from a track address demodulation part, comparing it with a track address received last time and detecting the moving direction of an optical head. CONSTITUTION:An RF signal including an information signal is also received simultaneously with a track error signal by the optical head 2. The RF signal is outputted to an address demodulation circuit 11 and a PLL circuit 12 after being processed by an RF signal reproduction circuit 10 and synchronized with a clock signal. Then a clock used for the demodulation of the track address, a sector address and recording data is generated. By the address demodulation circuit 11, an address signal is fetched and demodulated. A CPU receives the track address (a) of the last time and track address (b) of this time and immediately obtains (b-a). When the speed of a VCM is slowed down and inverted soon after, the positive and the negative code of the (b-a) is inverted but before and after it, the speed is nearly zero. Therefore when positional control pull-in is executed at the inverting time of the speed or immediately after the inversion, the correct pull-in can be easily executed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62169459A JP2576132B2 (en) | 1987-07-07 | 1987-07-07 | Optical disk drive |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62169459A JP2576132B2 (en) | 1987-07-07 | 1987-07-07 | Optical disk drive |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6413274A true JPS6413274A (en) | 1989-01-18 |
JP2576132B2 JP2576132B2 (en) | 1997-01-29 |
Family
ID=15886974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62169459A Expired - Lifetime JP2576132B2 (en) | 1987-07-07 | 1987-07-07 | Optical disk drive |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2576132B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5572919A (en) * | 1992-12-22 | 1996-11-12 | Kabushiki Kaisha Komatsu Seisakusho | Apparatus for controlling pressure in a cylinder chamber of a hydraulic pump-motor |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51126486A (en) * | 1975-04-25 | 1976-11-04 | Fujitsu Ltd | Positioning control system |
JPS6083227A (en) * | 1983-10-12 | 1985-05-11 | Nippon Gakki Seizo Kk | Feed controller of optical disk reproducing device |
JPS61251913A (en) * | 1985-05-01 | 1986-11-08 | Hitachi Ltd | Method and device for positioning carriage |
-
1987
- 1987-07-07 JP JP62169459A patent/JP2576132B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS51126486A (en) * | 1975-04-25 | 1976-11-04 | Fujitsu Ltd | Positioning control system |
JPS6083227A (en) * | 1983-10-12 | 1985-05-11 | Nippon Gakki Seizo Kk | Feed controller of optical disk reproducing device |
JPS61251913A (en) * | 1985-05-01 | 1986-11-08 | Hitachi Ltd | Method and device for positioning carriage |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5572919A (en) * | 1992-12-22 | 1996-11-12 | Kabushiki Kaisha Komatsu Seisakusho | Apparatus for controlling pressure in a cylinder chamber of a hydraulic pump-motor |
Also Published As
Publication number | Publication date |
---|---|
JP2576132B2 (en) | 1997-01-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071107 Year of fee payment: 11 |