JPS56114134A - Monitor device for operation state of optical information reader - Google Patents

Monitor device for operation state of optical information reader

Info

Publication number
JPS56114134A
JPS56114134A JP1586880A JP1586880A JPS56114134A JP S56114134 A JPS56114134 A JP S56114134A JP 1586880 A JP1586880 A JP 1586880A JP 1586880 A JP1586880 A JP 1586880A JP S56114134 A JPS56114134 A JP S56114134A
Authority
JP
Japan
Prior art keywords
frequency
focus servo
operation state
lissajous
outputs
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
JP1586880A
Other languages
Japanese (ja)
Other versions
JPS624777B2 (en
Inventor
Takashi Nishio
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic 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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP1586880A priority Critical patent/JPS56114134A/en
Publication of JPS56114134A publication Critical patent/JPS56114134A/en
Publication of JPS624777B2 publication Critical patent/JPS624777B2/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
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/10—Indicating arrangements; Warning arrangements
    • 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
    • G11B7/0908—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 focusing only

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To monitor the focus servo operation state, by describing a Lissajous' waveform on the oscilloscope on the basis of outputs of four photodetector for focus servo of the optical disc device. CONSTITUTION:Oscillator 17 outputs the stable sine signal of constant frequency omega/2pi and a constant amplitude, and the frequency is sufficiently higher than recording disc rotation fundamental frequency 30Hz and is higher than the cut-off frequency of the focus servo system. Now, if the recording face of the disc has no defects and the positional relation among the optical axis of the laser light, the lens, and photodetectors is normal, signals having the same frequency and phase difference 90 deg. are applied to X and Y deflecting plates of carhode-ray tube 21, and the Lissajous' waveform becomes a perfect circle.
JP1586880A 1980-02-12 1980-02-12 Monitor device for operation state of optical information reader Granted JPS56114134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1586880A JPS56114134A (en) 1980-02-12 1980-02-12 Monitor device for operation state of optical information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1586880A JPS56114134A (en) 1980-02-12 1980-02-12 Monitor device for operation state of optical information reader

Publications (2)

Publication Number Publication Date
JPS56114134A true JPS56114134A (en) 1981-09-08
JPS624777B2 JPS624777B2 (en) 1987-01-31

Family

ID=11900773

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1586880A Granted JPS56114134A (en) 1980-02-12 1980-02-12 Monitor device for operation state of optical information reader

Country Status (1)

Country Link
JP (1) JPS56114134A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0105130A2 (en) * 1982-09-07 1984-04-11 Discovision Associates Writing beam focus monitor
JPS61144732A (en) * 1984-12-18 1986-07-02 Olympus Optical Co Ltd Jitter measuring device
JPH01189726A (en) * 1988-01-26 1989-07-28 Matsushita Electric Works Ltd Random number generator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0105130A2 (en) * 1982-09-07 1984-04-11 Discovision Associates Writing beam focus monitor
JPS61144732A (en) * 1984-12-18 1986-07-02 Olympus Optical Co Ltd Jitter measuring device
JPH0447901B2 (en) * 1984-12-18 1992-08-05 Olympus Optical Co
JPH01189726A (en) * 1988-01-26 1989-07-28 Matsushita Electric Works Ltd Random number generator

Also Published As

Publication number Publication date
JPS624777B2 (en) 1987-01-31

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