JPS55125542A - Optical reproduction unit - Google Patents

Optical reproduction unit

Info

Publication number
JPS55125542A
JPS55125542A JP3148479A JP3148479A JPS55125542A JP S55125542 A JPS55125542 A JP S55125542A JP 3148479 A JP3148479 A JP 3148479A JP 3148479 A JP3148479 A JP 3148479A JP S55125542 A JPS55125542 A JP S55125542A
Authority
JP
Japan
Prior art keywords
signal
address
high speed
track
difference
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
Application number
JP3148479A
Other languages
Japanese (ja)
Other versions
JPS6313262B2 (en
Inventor
Masahiro Deguchi
Noboru Wakami
Mitsuro Moriya
Yasuhiro Goto
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP3148379A priority Critical patent/JPS55125541A/en
Priority to JP3148479A priority patent/JPS55125542A/en
Publication of JPS55125542A publication Critical patent/JPS55125542A/en
Publication of JPS6313262B2 publication Critical patent/JPS6313262B2/ja
Granted 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
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08541—Methods for track change, selection or preliminary positioning by moving the head involving track counting to determine position
    • 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
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head

Abstract

PURPOSE:To attain not only to perform retrieval at a high speed but also to increase the storage capacity by executing tracking exactly and at a high speed on the necessary track, by detecting the moving distance of the optical conversion device. CONSTITUTION:A track 2 which has recorded an image signal like a concentric circle as a concavo-convex or optical density image is formed on the recording medium 1. And the light flux from the light source 5 is irradiated on the medium 1 through the focus control element 10, its reflected light flux is projected to the photo-electric conversion device 11 through a splitter 8, and a focus control signal, a tracking signal and a high frequency signal are output from the device 11. And the reading signal of the track 2 is demodulated 18 as an image signal, and its address signal is provided to the microcomputer 25. The difference between the command address and the present address is calculated in the unit 25, the moving amount according to its difference and the polarity are transmitted to the counter 33, the motor 21 is driven at a high speed to reduce the address difference, and a signal is regenerated exactly.
JP3148479A 1979-03-16 1979-03-16 Optical reproduction unit Granted JPS55125542A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP3148379A JPS55125541A (en) 1979-03-16 1979-03-16 Retrieval unit
JP3148479A JPS55125542A (en) 1979-03-16 1979-03-16 Optical reproduction unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3148379A JPS55125541A (en) 1979-03-16 1979-03-16 Retrieval unit
JP3148479A JPS55125542A (en) 1979-03-16 1979-03-16 Optical reproduction unit

Publications (2)

Publication Number Publication Date
JPS55125542A true JPS55125542A (en) 1980-09-27
JPS6313262B2 JPS6313262B2 (en) 1988-03-24

Family

ID=26369957

Family Applications (2)

Application Number Title Priority Date Filing Date
JP3148379A Pending JPS55125541A (en) 1979-03-16 1979-03-16 Retrieval unit
JP3148479A Granted JPS55125542A (en) 1979-03-16 1979-03-16 Optical reproduction unit

Family Applications Before (1)

Application Number Title Priority Date Filing Date
JP3148379A Pending JPS55125541A (en) 1979-03-16 1979-03-16 Retrieval unit

Country Status (1)

Country Link
JP (2) JPS55125541A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58128030A (en) * 1982-01-24 1983-07-30 Sony Corp Disc reproducer
JPS59500245A (en) * 1982-02-17 1984-02-16 バロ−ス・コ−ポレ−ション Optical memory system with improved long seek capability
JPS59500243A (en) * 1982-02-17 1984-02-16 バロ−ス・コ−ポレ−ション Optical memory system with improved track following and seeking capabilities

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57181436A (en) * 1981-05-01 1982-11-08 Toshiba Corp Optical disc device
JPS5952473A (en) * 1982-09-17 1984-03-27 Matsushita Electric Ind Co Ltd Information recorder and reproducer
JPS59117740A (en) * 1982-12-24 1984-07-07 Hitachi Ltd Video disc player
JPH0782718B2 (en) * 1984-04-27 1995-09-06 パイオニア株式会社 Information read recovery method in disc player

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5224027B1 (en) * 1971-01-29 1977-06-28

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58128030A (en) * 1982-01-24 1983-07-30 Sony Corp Disc reproducer
JPH0439130B2 (en) * 1982-01-24 1992-06-26
JPS59500245A (en) * 1982-02-17 1984-02-16 バロ−ス・コ−ポレ−ション Optical memory system with improved long seek capability
JPS59500243A (en) * 1982-02-17 1984-02-16 バロ−ス・コ−ポレ−ション Optical memory system with improved track following and seeking capabilities

Also Published As

Publication number Publication date
JPS55125541A (en) 1980-09-27
JPS6313262B2 (en) 1988-03-24

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