JPS5755564A - Controller of pickup - Google Patents

Controller of pickup

Info

Publication number
JPS5755564A
JPS5755564A JP13138780A JP13138780A JPS5755564A JP S5755564 A JPS5755564 A JP S5755564A JP 13138780 A JP13138780 A JP 13138780A JP 13138780 A JP13138780 A JP 13138780A JP S5755564 A JPS5755564 A JP S5755564A
Authority
JP
Japan
Prior art keywords
disk
signal
detectors
error
tracking error
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
JP13138780A
Other languages
Japanese (ja)
Inventor
Satoru Kusaka
Yoshiro Shiroichi
Yutaka Oki
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP13138780A priority Critical patent/JPS5755564A/en
Publication of JPS5755564A publication Critical patent/JPS5755564A/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
    • G11B7/095—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0953—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 specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for eccentricity of the disc or disc tracks

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To correct both a tracking error and a time axial error, by storing the change of the eccentric extent of a disk while it turning one round and then controlling the point of detection of a pickup with the stored signal when the signal is reproduced. CONSTITUTION:Detectors 2 and 3 are set with a space smaller than the width of a bit 4 containing a photodetector formed on a track on a disk for example. Then the light is irradiated to the detectors to obtain signals. If a tracking error exists, the phase of output has a shift between the detectors 2 and 3 to obtain pulses PA and PB having inversion of phases with a half turn of the disk through waveform shaping circuits 5 and 6. With these pulses, a sine wave output S of a period per one round and a signal having a delay of pi/4 obtained via an up-down counter 8 and a D/A converter 9 respectively are stored. After this, the output signal is separated into a tracking error and a time axial error to be compared with the stored signal with each point of the same phase of revolution of the disk. Thus the position of a photoelectric transducer is controlled toward both the circumference and the diameter of revolution. In such way, both the tracking and time axial errors are corrected.
JP13138780A 1980-09-20 1980-09-20 Controller of pickup Pending JPS5755564A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13138780A JPS5755564A (en) 1980-09-20 1980-09-20 Controller of pickup

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13138780A JPS5755564A (en) 1980-09-20 1980-09-20 Controller of pickup

Publications (1)

Publication Number Publication Date
JPS5755564A true JPS5755564A (en) 1982-04-02

Family

ID=15056761

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13138780A Pending JPS5755564A (en) 1980-09-20 1980-09-20 Controller of pickup

Country Status (1)

Country Link
JP (1) JPS5755564A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125271A (en) * 1982-01-19 1983-07-26 Nippon Telegr & Teleph Corp <Ntt> Detector for track jitter pattern
JPS60163241A (en) * 1984-02-03 1985-08-26 Matsushita Electric Ind Co Ltd Reproducing device of information
WO1996029700A1 (en) * 1995-03-17 1996-09-26 Hitachi, Ltd. Magnetic recorder and magnetooptical recorder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4942688A (en) * 1972-06-29 1974-04-22
JPS49106305A (en) * 1973-02-08 1974-10-08
JPS54119907A (en) * 1978-03-10 1979-09-18 Hokushin Electric Works Magnetic disk memory

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4942688A (en) * 1972-06-29 1974-04-22
JPS49106305A (en) * 1973-02-08 1974-10-08
JPS54119907A (en) * 1978-03-10 1979-09-18 Hokushin Electric Works Magnetic disk memory

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58125271A (en) * 1982-01-19 1983-07-26 Nippon Telegr & Teleph Corp <Ntt> Detector for track jitter pattern
JPH0143380B2 (en) * 1982-01-19 1989-09-20 Nippon Telegraph & Telephone
JPS60163241A (en) * 1984-02-03 1985-08-26 Matsushita Electric Ind Co Ltd Reproducing device of information
JPH0421253B2 (en) * 1984-02-03 1992-04-09 Matsushita Electric Ind Co Ltd
WO1996029700A1 (en) * 1995-03-17 1996-09-26 Hitachi, Ltd. Magnetic recorder and magnetooptical recorder
US6130797A (en) * 1995-03-17 2000-10-10 Hitachi, Ltd. Magnetic recorder and magnetooptical recorder

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