JPS6459641A - Autotracking controller - Google Patents
Autotracking controllerInfo
- Publication number
- JPS6459641A JPS6459641A JP21544787A JP21544787A JPS6459641A JP S6459641 A JPS6459641 A JP S6459641A JP 21544787 A JP21544787 A JP 21544787A JP 21544787 A JP21544787 A JP 21544787A JP S6459641 A JPS6459641 A JP S6459641A
- Authority
- JP
- Japan
- Prior art keywords
- abnormality
- sensitivity
- circuit
- autotracking
- tracking
- 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 prevent the detection of tracking abnormality from being erroneously detected by controlling the sensitivity of a tracking abnormality detecting means via a sensitivity changeover circuit based on an output of the abnormality detecting means. CONSTITUTION:A summational output of photoelectric transducers 1a and 1b by a summing amplifier 8 is monitored by an autotracking abnormality circuit 10, and when it is more than a prescribed value, it is decided as abnormality and an autotracking abnormality signal Sh for moving an optical head in the tracking direction is outputted from the circuit 10 to a system controller. The sensitivity of the circuit 10 is then changed over to a low sensitivity for a fixed period via the sensitivity changeover circuit 11 equipped also with a monostable multivibrator, to which a control signal Si from the system controller is inputted based on said signal Sh. By this method, detecting erroneously such a nonabnormal state due to increasing vibrations during the movement of the optical head is prevented, thus enabling the autotracking abnormality detection to be carried out with high accuracy.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21544787A JPH0697506B2 (en) | 1987-08-31 | 1987-08-31 | Auto tracking control device |
DE3887601T DE3887601T2 (en) | 1987-08-31 | 1988-08-17 | Information recording and / or reproducing device with means for detecting all tracking errors. |
US07/233,489 US4982393A (en) | 1987-08-31 | 1988-08-17 | Information recording and/or reproducing apparatus provided with means for detecting abnormality of tracking servo |
EP88307626A EP0306179B1 (en) | 1987-08-31 | 1988-08-17 | Information recording and/or reproducing apparatus provided with means for detecting any abnormality of tracking servo |
CA000575302A CA1311557C (en) | 1987-08-31 | 1988-08-19 | Information recording and/or reproducing apparatus provided with meansfor detecting any abnormality of tracking servo |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21544787A JPH0697506B2 (en) | 1987-08-31 | 1987-08-31 | Auto tracking control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6459641A true JPS6459641A (en) | 1989-03-07 |
JPH0697506B2 JPH0697506B2 (en) | 1994-11-30 |
Family
ID=16672510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21544787A Expired - Lifetime JPH0697506B2 (en) | 1987-08-31 | 1987-08-31 | Auto tracking control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0697506B2 (en) |
-
1987
- 1987-08-31 JP JP21544787A patent/JPH0697506B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0697506B2 (en) | 1994-11-30 |
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