JPS6450243A - Optical disk recording and reproducing device - Google Patents

Optical disk recording and reproducing device

Info

Publication number
JPS6450243A
JPS6450243A JP20724987A JP20724987A JPS6450243A JP S6450243 A JPS6450243 A JP S6450243A JP 20724987 A JP20724987 A JP 20724987A JP 20724987 A JP20724987 A JP 20724987A JP S6450243 A JPS6450243 A JP S6450243A
Authority
JP
Japan
Prior art keywords
tracking
error signal
tracking error
phase compensation
recording operation
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
Application number
JP20724987A
Other languages
Japanese (ja)
Inventor
Hideki Doi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu General Ltd
Original Assignee
Fujitsu General Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu General Ltd filed Critical Fujitsu General Ltd
Priority to JP20724987A priority Critical patent/JPS6450243A/en
Publication of JPS6450243A publication Critical patent/JPS6450243A/en
Pending legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To perform normal tracking control even in a recording operation, by performing the tracking control based on a tracking error signal obtained by a push-pull method in the recording operation and the tracking error signal obtained by a three-beam method in a reproducing operation. CONSTITUTION:The detecting signal of a main laser beam detected by the photodetector 3 of an optical head 2 and the detecting signals of two sub laser beams are inputted to a tracking error signal detection circuit 10, and the tracking error signal by the push-pull method based on those detecting signals is inputted to a first phase compensation circuit 11, and the tracking error signal by the three-beam method to a second phase compensation circuit 12, then, a phase compensation processing is applied, respectively. In the recording operation and the reproducing operation, an offset or a gain required for the correct operation of an actuator 8 for tracking is adjusted, and either on one side of the signals obtained at those phase compensation circuits 11 and 12 is switched by a switching means 13, and is fed back to the actuator 8 for tracking. In such a way, it is possible to perform the tracking control normally even in the recording operation.
JP20724987A 1987-08-20 1987-08-20 Optical disk recording and reproducing device Pending JPS6450243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20724987A JPS6450243A (en) 1987-08-20 1987-08-20 Optical disk recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20724987A JPS6450243A (en) 1987-08-20 1987-08-20 Optical disk recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS6450243A true JPS6450243A (en) 1989-02-27

Family

ID=16536680

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20724987A Pending JPS6450243A (en) 1987-08-20 1987-08-20 Optical disk recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS6450243A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11527130B2 (en) 2015-08-03 2022-12-13 Angel Group Co., Ltd. Fraud detection system in a casino

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11527130B2 (en) 2015-08-03 2022-12-13 Angel Group Co., Ltd. Fraud detection system in a casino
US11527131B2 (en) 2015-08-03 2022-12-13 Angel Group Co., Ltd. Fraud detection system in a casino

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