JPS5737750A - Automatic tracking system - Google Patents

Automatic tracking system

Info

Publication number
JPS5737750A
JPS5737750A JP11446780A JP11446780A JPS5737750A JP S5737750 A JPS5737750 A JP S5737750A JP 11446780 A JP11446780 A JP 11446780A JP 11446780 A JP11446780 A JP 11446780A JP S5737750 A JPS5737750 A JP S5737750A
Authority
JP
Japan
Prior art keywords
tracking
voltage
control loop
main beam
subordinate
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
JP11446780A
Other languages
Japanese (ja)
Inventor
Kenji Kimura
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.)
Olympus Corp
Original Assignee
Olympus Optical Co 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP11446780A priority Critical patent/JPS5737750A/en
Publication of JPS5737750A publication Critical patent/JPS5737750A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following

Abstract

PURPOSE:To stabilize a control loop by providing a control loop for the tracking of a main beam in addition to a control loop for that of a subordinate beam, and by controlling the subordinate beam so that its error voltage is within a constant range. CONSTITUTION:A main beam is position-modulated by a modulating signal 40 generated by an oscillator 15 and converted by a photoelectric converter 7 into an electric signal, which is applied to a sample holding circuit 24 to obtain a tracking error voltage. The tracking error voltage is applied to voltage comparators 29 and 30 and when it is in a range of certain threshold levels, it is judged that the main beam is scanning on an information track. When, however, it goes beyond the threshold level range, a capacitor 36 for voltage storage is charged or discharged in response to a pulse 47 and its voltage is added to a reference value 18 to generate a new reference value for the tracking of a subordinate beam, thereby performing tracking by driving a moving coil 9.
JP11446780A 1980-08-19 1980-08-19 Automatic tracking system Pending JPS5737750A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11446780A JPS5737750A (en) 1980-08-19 1980-08-19 Automatic tracking system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11446780A JPS5737750A (en) 1980-08-19 1980-08-19 Automatic tracking system

Publications (1)

Publication Number Publication Date
JPS5737750A true JPS5737750A (en) 1982-03-02

Family

ID=14638457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11446780A Pending JPS5737750A (en) 1980-08-19 1980-08-19 Automatic tracking system

Country Status (1)

Country Link
JP (1) JPS5737750A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6148423U (en) * 1984-09-03 1986-04-01
JPH076385A (en) * 1993-12-10 1995-01-10 Hitachi Ltd Optical information processing method and device therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6148423U (en) * 1984-09-03 1986-04-01
JPH076385A (en) * 1993-12-10 1995-01-10 Hitachi Ltd Optical information processing method and device therefor

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