JPS5744239A - Information reproducer - Google Patents

Information reproducer

Info

Publication number
JPS5744239A
JPS5744239A JP56108303A JP10830381A JPS5744239A JP S5744239 A JPS5744239 A JP S5744239A JP 56108303 A JP56108303 A JP 56108303A JP 10830381 A JP10830381 A JP 10830381A JP S5744239 A JPS5744239 A JP S5744239A
Authority
JP
Japan
Prior art keywords
signal
sent
tracking
signals
sampling pulse
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
JP56108303A
Other languages
Japanese (ja)
Other versions
JPS6362809B2 (en
Inventor
Akimichi Terada
Seiichi Mita
Masaru Matsumura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56108303A priority Critical patent/JPS5744239A/en
Publication of JPS5744239A publication Critical patent/JPS5744239A/en
Publication of JPS6362809B2 publication Critical patent/JPS6362809B2/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
    • G11B7/09—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
    • G11B7/0938—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 servo format, e.g. guide tracks, pilot signals

Abstract

PURPOSE:To realize a simple and inexpensive information reproducer, by detecting the two tracking signals produced from the TV signal with the sampling pulse and controlling a light spot via the difference signal of the two tracking signals. CONSTITUTION:The tracking signals are recorded in the regions slightly shifted right and left from the center of a track an in the form of two frequency signals. The signal detected by a signal detector 45 is converted into a TV signal through an amplifier 46 and a demodulator 47. The sampling pulse given from a sampling pulse generating circuit 31 is sent to a gate 32 by the pulse signal given from a synchronous separating circuit 30, and the tracking signal is sampled to be sent to band pass filters 33 and 34. The output signals of the filters 33 and 34 are supplied to an arithmetic circuit 39 through envelope curve wave detecting circuits 35 and 36 plus low band pass filters 37 and 38 respectively. The difference output signal is sent to a driving device 41 via an amplifier 40 to control a light spot. In such way, a simple and inexpensive reproducer is obtained.
JP56108303A 1981-07-13 1981-07-13 Information reproducer Granted JPS5744239A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56108303A JPS5744239A (en) 1981-07-13 1981-07-13 Information reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56108303A JPS5744239A (en) 1981-07-13 1981-07-13 Information reproducer

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP48101204A Division JPS5912070B2 (en) 1973-09-10 1973-09-10 Information recording and playback method

Publications (2)

Publication Number Publication Date
JPS5744239A true JPS5744239A (en) 1982-03-12
JPS6362809B2 JPS6362809B2 (en) 1988-12-05

Family

ID=14481269

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56108303A Granted JPS5744239A (en) 1981-07-13 1981-07-13 Information reproducer

Country Status (1)

Country Link
JP (1) JPS5744239A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60261038A (en) * 1984-06-07 1985-12-24 Victor Co Of Japan Ltd Recording and reproducing system of information recording medium disc possible for repetitive recording
JPH0215427A (en) * 1988-07-04 1990-01-19 Ricoh Co Ltd Tracking error detecting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60261038A (en) * 1984-06-07 1985-12-24 Victor Co Of Japan Ltd Recording and reproducing system of information recording medium disc possible for repetitive recording
JPH0215427A (en) * 1988-07-04 1990-01-19 Ricoh Co Ltd Tracking error detecting method

Also Published As

Publication number Publication date
JPS6362809B2 (en) 1988-12-05

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