JPS5641538A - Tracking control circuit of optical disk memory unit - Google Patents

Tracking control circuit of optical disk memory unit

Info

Publication number
JPS5641538A
JPS5641538A JP11588379A JP11588379A JPS5641538A JP S5641538 A JPS5641538 A JP S5641538A JP 11588379 A JP11588379 A JP 11588379A JP 11588379 A JP11588379 A JP 11588379A JP S5641538 A JPS5641538 A JP S5641538A
Authority
JP
Japan
Prior art keywords
output
tracking control
optical disk
envelope
signal
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
JP11588379A
Other languages
Japanese (ja)
Inventor
Masafumi Yokota
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11588379A priority Critical patent/JPS5641538A/en
Publication of JPS5641538A publication Critical patent/JPS5641538A/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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08547—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements
    • G11B7/08564—Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements using galvanomirrors

Abstract

PURPOSE:To track the recording track exactly at a high speed, by comparing an envelope detected from the signal waveform of the recording information which has been taken out from the output signal of each photodetector, and obtaining a tracking control signal. CONSTITUTION:When each output of the photodetectors 30a, 30b is provided to the amplifiers 34, 35 through the preamplifiers 31, 32, after the signal components corresponding to flaws, dust, etc. have been removed together with the DC component, being led by the envelope detectors 36, 37, the envelope of a signal waveform corresponding to the information is detected. Also, when each output of the detectors 36, 37, is compared by the differential amplifier 38, it is decided whether the position irradiated by the reading beam l2 to the information recording track on the optical disk 10 is shifted in the radial direction of the disk 10 or not, and in case it is shifted, the galvanometer 25 in the optical head 24 is driven by operation of the galvanometer driver 39 according to the output of the amplifier 38, and the position irradiated by the reading beam is corrected. Accordingly, the recording track can be tracked exactly at a high speed.
JP11588379A 1979-09-10 1979-09-10 Tracking control circuit of optical disk memory unit Pending JPS5641538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11588379A JPS5641538A (en) 1979-09-10 1979-09-10 Tracking control circuit of optical disk memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11588379A JPS5641538A (en) 1979-09-10 1979-09-10 Tracking control circuit of optical disk memory unit

Publications (1)

Publication Number Publication Date
JPS5641538A true JPS5641538A (en) 1981-04-18

Family

ID=14673532

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11588379A Pending JPS5641538A (en) 1979-09-10 1979-09-10 Tracking control circuit of optical disk memory unit

Country Status (1)

Country Link
JP (1) JPS5641538A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5857639A (en) * 1981-09-30 1983-04-05 Sharp Corp Information reproducer
JPS61242343A (en) * 1985-04-19 1986-10-28 Hitachi Ltd Tracking controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5857639A (en) * 1981-09-30 1983-04-05 Sharp Corp Information reproducer
JPS61242343A (en) * 1985-04-19 1986-10-28 Hitachi Ltd Tracking controller

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