JPS6120054B2 - - Google Patents

Info

Publication number
JPS6120054B2
JPS6120054B2 JP53008249A JP824978A JPS6120054B2 JP S6120054 B2 JPS6120054 B2 JP S6120054B2 JP 53008249 A JP53008249 A JP 53008249A JP 824978 A JP824978 A JP 824978A JP S6120054 B2 JPS6120054 B2 JP S6120054B2
Authority
JP
Japan
Prior art keywords
sine wave
laser light
wave signal
signal
circuit
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.)
Expired
Application number
JP53008249A
Other languages
English (en)
Japanese (ja)
Other versions
JPS54102107A (en
Inventor
Tooru Fujishima
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 JP824978A priority Critical patent/JPS54102107A/ja
Priority to US06/007,809 priority patent/US4310911A/en
Publication of JPS54102107A publication Critical patent/JPS54102107A/ja
Publication of JPS6120054B2 publication Critical patent/JPS6120054B2/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

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Automatic Focus Adjustment (AREA)
  • Control Of Position Or Direction (AREA)
JP824978A 1978-01-30 1978-01-30 Control information detecting method Granted JPS54102107A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP824978A JPS54102107A (en) 1978-01-30 1978-01-30 Control information detecting method
US06/007,809 US4310911A (en) 1978-01-30 1979-01-30 Control information detecting method and apparatus in optical-type video disc player

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP824978A JPS54102107A (en) 1978-01-30 1978-01-30 Control information detecting method

Publications (2)

Publication Number Publication Date
JPS54102107A JPS54102107A (en) 1979-08-11
JPS6120054B2 true JPS6120054B2 (en, 2012) 1986-05-20

Family

ID=11687856

Family Applications (1)

Application Number Title Priority Date Filing Date
JP824978A Granted JPS54102107A (en) 1978-01-30 1978-01-30 Control information detecting method

Country Status (2)

Country Link
US (1) US4310911A (en, 2012)
JP (1) JPS54102107A (en, 2012)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54133305A (en) * 1978-04-07 1979-10-17 Hitachi Ltd Information recorder
US4504934A (en) * 1980-05-02 1985-03-12 Matsushita Electric Industrial Co., Ltd. Optical signal reproducing apparatus
JPS57120238A (en) * 1981-01-16 1982-07-27 Matsushita Electric Ind Co Ltd Reproducing device
JPS57181431A (en) * 1981-04-10 1982-11-08 Olympus Optical Co Ltd Automatic tracking system for optical type disc
US4719341A (en) * 1986-10-01 1988-01-12 Mechanical Technology Incorporated Fiber optic displacement sensor with oscillating optical path length

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7215307A (en, 2012) * 1972-11-11 1974-05-14
US3848095A (en) * 1972-12-20 1974-11-12 I O Metrics Corp Three dimensional electro-optical retrieval system
FR2251876B1 (en, 2012) * 1973-11-16 1977-09-23 Thomson Brandt
US3932700A (en) * 1974-02-04 1976-01-13 Zenith Radio Corporation Focus tracking registration for optical reproducing systems
US3985952A (en) * 1974-02-04 1976-10-12 Zenith Radio Corporation Elasto-optic device for spot wobble in a video disc player
AR205839A1 (es) * 1974-09-30 1976-06-07 Mca Disco Vision Servodisposicion para recorrer opticamente y leer simultaneamente un canal de informacion almacenado en un disco de video
NL174609C (nl) * 1975-10-15 1984-07-02 Philips Nv Volgspiegelinrichting in een optische platenspeler.
NL178915C (nl) * 1976-01-16 1986-06-02 Philips Nv Automatisch optisch focusseersysteem.
NL7600479A (nl) * 1976-01-19 1977-07-21 Philips Nv Automatisch optisch focusseersysteem.
NL7713711A (nl) * 1977-12-12 1979-06-14 Philips Nv Optisch uitleeseenheid voor het uitlezen van een bewegende informatiedrager, in het bijzonder voor het uitlezen van een videoplaat.

Also Published As

Publication number Publication date
US4310911A (en) 1982-01-12
JPS54102107A (en) 1979-08-11

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