JPS5773422A - Follow-up controller - Google Patents

Follow-up controller

Info

Publication number
JPS5773422A
JPS5773422A JP14957280A JP14957280A JPS5773422A JP S5773422 A JPS5773422 A JP S5773422A JP 14957280 A JP14957280 A JP 14957280A JP 14957280 A JP14957280 A JP 14957280A JP S5773422 A JPS5773422 A JP S5773422A
Authority
JP
Japan
Prior art keywords
signal
follow
mirror
tracking
phase
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
JP14957280A
Other languages
Japanese (ja)
Inventor
Masahiro Daimon
Kazuo Hirasawa
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP14957280A priority Critical patent/JPS5773422A/en
Publication of JPS5773422A publication Critical patent/JPS5773422A/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
    • G11B7/0901—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 for track following only

Abstract

PURPOSE:To obtain a follow-up controlling device which is so stable that a servo system can work completely, by giving the synchronous wave detection to the frequency component correlated with the position deviation period between a follow- up part and a part to be followed up and then eliminating the frequency component through a filter. CONSTITUTION:When the information track of an optical disk 7 is followed up by a spot condensed through a condenser lens 3, the reflected light polarized by a half mirror 4 is converted into an electric signal by a photodetector 8 to be applied to a tracking signal generating circuit 20. The circuit 20 produces a signal of wobbling frequency fw through an oscillator 18 to give a minute vibration to a wobbler 5 and at the same time applies the tracking signal to a tracking mirror 6 to control the angle of rotation. The signal f2 of the oscillator 18 is supplied to a phase comparator 11 via a phase shifter 17 to be compared with the signal given from the photodetector 8 in terms of the phase. The comparator 11 detects the signals of frequencies fw and 2fw correlated with the position deviation period between the condenser spot and the information track. These signals are eliminated through a notch filter 50 and supplied to the mirror 6 to ensure a stable servo operation.
JP14957280A 1980-10-24 1980-10-24 Follow-up controller Pending JPS5773422A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14957280A JPS5773422A (en) 1980-10-24 1980-10-24 Follow-up controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14957280A JPS5773422A (en) 1980-10-24 1980-10-24 Follow-up controller

Publications (1)

Publication Number Publication Date
JPS5773422A true JPS5773422A (en) 1982-05-08

Family

ID=15478114

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14957280A Pending JPS5773422A (en) 1980-10-24 1980-10-24 Follow-up controller

Country Status (1)

Country Link
JP (1) JPS5773422A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008286323A (en) * 2007-05-18 2008-11-27 Isel Co Ltd Linear motion mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008286323A (en) * 2007-05-18 2008-11-27 Isel Co Ltd Linear motion mechanism

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