JPS5755565A - Controller of pickup - Google Patents

Controller of pickup

Info

Publication number
JPS5755565A
JPS5755565A JP13138880A JP13138880A JPS5755565A JP S5755565 A JPS5755565 A JP S5755565A JP 13138880 A JP13138880 A JP 13138880A JP 13138880 A JP13138880 A JP 13138880A JP S5755565 A JPS5755565 A JP S5755565A
Authority
JP
Japan
Prior art keywords
disk
detectors
sine wave
output
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
JP13138880A
Other languages
Japanese (ja)
Inventor
Satoru Kusaka
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 JP13138880A priority Critical patent/JPS5755565A/en
Publication of JPS5755565A publication Critical patent/JPS5755565A/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
    • G11B7/0901—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 for track following only

Landscapes

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

Abstract

PURPOSE:To correct both a tracking error and a time axial error, by comparing the signal produced while a disk turning one round with the sine wave of cosine wave which is alreadly written and then controlling the position of the point of detection. 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, and the light is irradiated to these detectors to detect the signal. 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 the phases reversed with a half turn of a disk through waveform shaping circuits 5 and 6 respectively. With these pulses, a sine wave output S of a period per one round is obtained via an up-down counter 8 and a D/A converter 9. This output S is divided into a tracking error and a time axial error to be compared with a sine wave or cosine waveform already stored with each point of the same phase of revolution of the disk. Thus the position of a photoelectric transducer is controlled toward the circumference and diameter of revolution. In such way, both the tracking and time axial errors are corrected.
JP13138880A 1980-09-20 1980-09-20 Controller of pickup Pending JPS5755565A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13138880A JPS5755565A (en) 1980-09-20 1980-09-20 Controller of pickup

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13138880A JPS5755565A (en) 1980-09-20 1980-09-20 Controller of pickup

Publications (1)

Publication Number Publication Date
JPS5755565A true JPS5755565A (en) 1982-04-02

Family

ID=15056787

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13138880A Pending JPS5755565A (en) 1980-09-20 1980-09-20 Controller of pickup

Country Status (1)

Country Link
JP (1) JPS5755565A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6218683A (en) * 1985-07-16 1987-01-27 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Servo control system for disc file
JPS62134716U (en) * 1986-02-18 1987-08-25
JPH02226525A (en) * 1989-02-23 1990-09-10 Konica Corp Actuator servo method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6218683A (en) * 1985-07-16 1987-01-27 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション Servo control system for disc file
JPH0410145B2 (en) * 1985-07-16 1992-02-24
JPS62134716U (en) * 1986-02-18 1987-08-25
JPH02226525A (en) * 1989-02-23 1990-09-10 Konica Corp Actuator servo method

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