JPS5755541A - Optical reader - Google Patents

Optical reader

Info

Publication number
JPS5755541A
JPS5755541A JP13091880A JP13091880A JPS5755541A JP S5755541 A JPS5755541 A JP S5755541A JP 13091880 A JP13091880 A JP 13091880A JP 13091880 A JP13091880 A JP 13091880A JP S5755541 A JPS5755541 A JP S5755541A
Authority
JP
Japan
Prior art keywords
pulse
supplied
tracking
circuit
certain period
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
JP13091880A
Other languages
Japanese (ja)
Other versions
JPH0140405B2 (en
Inventor
Keiichi Yoshizumi
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 JP13091880A priority Critical patent/JPS5755541A/en
Publication of JPS5755541A publication Critical patent/JPS5755541A/en
Publication of JPH0140405B2 publication Critical patent/JPH0140405B2/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
    • G11B7/08517—Methods for track change, selection or preliminary positioning by moving the head with tracking pull-in only

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

PURPOSE:To facilitate easy reproduction while skipping over a certain number of tracks, by opening a tracking control loop with the pulse of a certain period in the fast forwarding and fast rewinding times. CONSTITUTION:The tracking signal extracted out of a photodetector 14 is supplied to a differential amplifier 21 and then drives a coil 18 via a control circuit 22 which is controlled by the output of a pulse generator 23 that produces a pulse of a certain period. When no pulse is supplied to the circuit 22, tracking action is carried out. Then this tracking action is discontinued if the pulse is supplied to the circuit 22. Thus a tracing track moves by the shift of the entire head.
JP13091880A 1980-09-19 1980-09-19 Optical reader Granted JPS5755541A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13091880A JPS5755541A (en) 1980-09-19 1980-09-19 Optical reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13091880A JPS5755541A (en) 1980-09-19 1980-09-19 Optical reader

Publications (2)

Publication Number Publication Date
JPS5755541A true JPS5755541A (en) 1982-04-02
JPH0140405B2 JPH0140405B2 (en) 1989-08-29

Family

ID=15045774

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13091880A Granted JPS5755541A (en) 1980-09-19 1980-09-19 Optical reader

Country Status (1)

Country Link
JP (1) JPS5755541A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58218052A (en) * 1982-06-12 1983-12-19 Sony Corp Optical disc reproducer
JPS5936069U (en) * 1982-08-30 1984-03-06 三菱電機株式会社 PCM disk playback device
JPS60256927A (en) * 1984-06-01 1985-12-18 Nippon Gakki Seizo Kk Read controller of optical disc reproducing device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5139142A (en) * 1974-09-30 1976-04-01 Mansei Kogyo Kk
JPS5466104A (en) * 1977-11-07 1979-05-28 Hitachi Ltd Light spot position controller

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5139142A (en) * 1974-09-30 1976-04-01 Mansei Kogyo Kk
JPS5466104A (en) * 1977-11-07 1979-05-28 Hitachi Ltd Light spot position controller

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58218052A (en) * 1982-06-12 1983-12-19 Sony Corp Optical disc reproducer
JPH0410130B2 (en) * 1982-06-12 1992-02-24
JPS5936069U (en) * 1982-08-30 1984-03-06 三菱電機株式会社 PCM disk playback device
JPH0127184Y2 (en) * 1982-08-30 1989-08-14
JPS60256927A (en) * 1984-06-01 1985-12-18 Nippon Gakki Seizo Kk Read controller of optical disc reproducing device
JPH0441418B2 (en) * 1984-06-01 1992-07-08 Yamaha Corp

Also Published As

Publication number Publication date
JPH0140405B2 (en) 1989-08-29

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