JPS57120236A - Optical reproducing device - Google Patents

Optical reproducing device

Info

Publication number
JPS57120236A
JPS57120236A JP416481A JP416481A JPS57120236A JP S57120236 A JPS57120236 A JP S57120236A JP 416481 A JP416481 A JP 416481A JP 416481 A JP416481 A JP 416481A JP S57120236 A JPS57120236 A JP S57120236A
Authority
JP
Japan
Prior art keywords
output
component
pulses
frequency
frequency divider
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
JP416481A
Other languages
Japanese (ja)
Other versions
JPS634251B2 (en
Inventor
Tadashi Motoyama
Mitsugi Yoshihiro
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 JP416481A priority Critical patent/JPS57120236A/en
Publication of JPS57120236A publication Critical patent/JPS57120236A/en
Publication of JPS634251B2 publication Critical patent/JPS634251B2/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
    • G11B7/095—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)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To eliminate the influence of a rotary eccentricity component, by exercising position control by adding pieces of tracking error information each sampled and held every time a disk turns by 180 degrees. CONSTITUTION:Output pulses from a frequency generator 21 fitted on the shaft of a spindle motor 7 which drives a disk 1 are sent to a frequency divider 22 to be divided into pulses which each correspond to one turn. The output of the frequency divider 22 is supplied to sample pulse generating circuits 25 and 26, and the outputs of sample holding circuts 19 and 20 are added by an adder 27 with a 180 deg.C phase difference, thereby extracting only a low frequency component removed completely from the 30Hz AC component in the output of a low-pass filter 11.
JP416481A 1981-01-14 1981-01-14 Optical reproducing device Granted JPS57120236A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP416481A JPS57120236A (en) 1981-01-14 1981-01-14 Optical reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP416481A JPS57120236A (en) 1981-01-14 1981-01-14 Optical reproducing device

Publications (2)

Publication Number Publication Date
JPS57120236A true JPS57120236A (en) 1982-07-27
JPS634251B2 JPS634251B2 (en) 1988-01-28

Family

ID=11577097

Family Applications (1)

Application Number Title Priority Date Filing Date
JP416481A Granted JPS57120236A (en) 1981-01-14 1981-01-14 Optical reproducing device

Country Status (1)

Country Link
JP (1) JPS57120236A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207439A (en) * 1983-05-12 1984-11-24 Nec Corp Beam access device of optical disk system
EP0649132A1 (en) * 1993-09-28 1995-04-19 Sony Corporation Disc eccentricity measuring apparatus and method thereof and apparatus for recording and/or reproducing disc-shaped recording medium

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59207439A (en) * 1983-05-12 1984-11-24 Nec Corp Beam access device of optical disk system
JPH0150974B2 (en) * 1983-05-12 1989-11-01 Nippon Electric Co
EP0649132A1 (en) * 1993-09-28 1995-04-19 Sony Corporation Disc eccentricity measuring apparatus and method thereof and apparatus for recording and/or reproducing disc-shaped recording medium
US6266304B1 (en) 1993-09-28 2001-07-24 Sony Corporation Disc eccentricity measuring apparatus and method thereof and apparatus for recording and/or reproducing disc-shaped recording medium

Also Published As

Publication number Publication date
JPS634251B2 (en) 1988-01-28

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