JPS6419538A - Circuit for correcting eccentricity of optical disk - Google Patents
Circuit for correcting eccentricity of optical diskInfo
- Publication number
- JPS6419538A JPS6419538A JP17391887A JP17391887A JPS6419538A JP S6419538 A JPS6419538 A JP S6419538A JP 17391887 A JP17391887 A JP 17391887A JP 17391887 A JP17391887 A JP 17391887A JP S6419538 A JPS6419538 A JP S6419538A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- eccentric
- eccentricity
- actuator
- laser beam
- 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 For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To accurately make a laser beam follow up a track by correcting the eccentricity of a disk, by providing an actuator equalization circuit, and applying closed loop control on a stored eccentric quantity. CONSTITUTION:The actuator equalization circuit 10 which detects the displacement of a laser beam as an electric quantity is provided. Then, the eccentric quantity of an optical disk is detected by a tracking error signal, and is stored in an eccentric waveform storage circuit 2. By oscillating a track actuator means by the signal, the displacement quantity is detected at the equalization circuit 10, and the signal is fed back to the eccentric waveform circuit 2, and is compared with the eccentric quantity stored as a target, thereby, the closed loop control for the correction of the eccentricity is performed. Therefore, it is possible to make the laser beam follow up the track accurately by correcting the eccentricity of the disk without being affected by the influence of low area resonance in the actuator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62173918A JPH077524B2 (en) | 1987-07-14 | 1987-07-14 | Optical disk eccentricity correction circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62173918A JPH077524B2 (en) | 1987-07-14 | 1987-07-14 | Optical disk eccentricity correction circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6419538A true JPS6419538A (en) | 1989-01-23 |
JPH077524B2 JPH077524B2 (en) | 1995-01-30 |
Family
ID=15969489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62173918A Expired - Fee Related JPH077524B2 (en) | 1987-07-14 | 1987-07-14 | Optical disk eccentricity correction circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH077524B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5892742A (en) * | 1996-04-22 | 1999-04-06 | Fujitsu Limited | Optical storage apparatus |
WO2004049321A1 (en) * | 2002-11-26 | 2004-06-10 | Hamamatsu Metrix Co., Ltd. | Optical disc eccentric amount measurement device and eccentric amount measurement method using the same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS567247A (en) * | 1979-06-28 | 1981-01-24 | Matsushita Electric Ind Co Ltd | Information reproducing device |
JPS60263345A (en) * | 1984-06-12 | 1985-12-26 | Yokogawa Hokushin Electric Corp | Optical memory device |
-
1987
- 1987-07-14 JP JP62173918A patent/JPH077524B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS567247A (en) * | 1979-06-28 | 1981-01-24 | Matsushita Electric Ind Co Ltd | Information reproducing device |
JPS60263345A (en) * | 1984-06-12 | 1985-12-26 | Yokogawa Hokushin Electric Corp | Optical memory device |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5892742A (en) * | 1996-04-22 | 1999-04-06 | Fujitsu Limited | Optical storage apparatus |
US5896354A (en) * | 1996-04-22 | 1999-04-20 | Fujitsu Limited | Optical storage apparatus having switching control circuit for controlling an envelope detecting function in accordance with a medium type or access type |
WO2004049321A1 (en) * | 2002-11-26 | 2004-06-10 | Hamamatsu Metrix Co., Ltd. | Optical disc eccentric amount measurement device and eccentric amount measurement method using the same |
Also Published As
Publication number | Publication date |
---|---|
JPH077524B2 (en) | 1995-01-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3166595D1 (en) | Apparatus and method for controlling focus in a recording system | |
GB1561541A (en) | Optical reading device comprising a focusing de | |
EP0325104A3 (en) | Magneto-optical head with separate optical paths for error and data detection | |
JPS6419538A (en) | Circuit for correcting eccentricity of optical disk | |
JPS57120275A (en) | Tracking servo lead-in system of recorded information reader | |
JPS6448226A (en) | Optical disk device | |
EP0328354A3 (en) | Optical information processing apparatus | |
MY123554A (en) | Method for controlling track jumps of optical pickup | |
EP0151220B1 (en) | Servo system for the positioning of an optical beam | |
JPS5760568A (en) | Controller for pickup | |
JPH0330123A (en) | Focus offset correction circuit for optical pickup device | |
HK42796A (en) | Apparatus for the reproduction of data | |
JPS6462838A (en) | Optical pick-up | |
KR950001072B1 (en) | Track jump control method & apparatus of optical disk apparatus | |
JPS6433779A (en) | Track access device | |
KR100211211B1 (en) | Sled gain control device and method thereof in digital video disc player | |
JPS6442031A (en) | Optical disk device | |
EP0274567B1 (en) | Servo-system for positioning an optical beam | |
JPS6466829A (en) | Tracking device for optical disk device | |
JPS5417703A (en) | Reproducer of optical type video discs | |
JPS6455766A (en) | Magneto-optical recording, reproducing and erasing device | |
JPS57164445A (en) | Information recording device | |
JPS55132537A (en) | Track access system | |
JPS6437781A (en) | Method for leading-in tracking servo of information recording and reproducing device | |
JPS6459682A (en) | Optical disk device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |