GB1461590A - Reproducing device - Google Patents

Reproducing device

Info

Publication number
GB1461590A
GB1461590A GB5904273A GB5904273A GB1461590A GB 1461590 A GB1461590 A GB 1461590A GB 5904273 A GB5904273 A GB 5904273A GB 5904273 A GB5904273 A GB 5904273A GB 1461590 A GB1461590 A GB 1461590A
Authority
GB
United Kingdom
Prior art keywords
cells
disposed
dec
radius
light beam
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
GB5904273A
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.)
Thales SA
Original Assignee
Thomson CSF SA
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
Priority claimed from FR7230346A external-priority patent/FR2197495A5/fr
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of GB1461590A publication Critical patent/GB1461590A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/048—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using other optical storage elements
    • 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
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing
    • 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
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • 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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

1461590 Optical playback THOMSON CSF 20 Dec 1973 [26 Dec 1972] 59042/73 Addition to 1451799 Heading G5R The optical playback arrangement of the parent Specification 1,451,799 is modified by the provision of four photocells 100, 101, 110 and 111 in the light detecting means. The cells are disposed about the axis 0Z of the reading light beam with two cells 100 and 101 disposed in line with a radius of the record disc and used as described in the parent case for positioning the light beam correctly and the other two cells 110 and 111 disposed in a line perpendicular to the radius and connected to a differential amplifier 112 supplying the output signal U(t).
GB5904273A 1972-08-25 1973-12-20 Reproducing device Expired GB1461590A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7230346A FR2197495A5 (en) 1972-08-25 1972-08-25
FR7246189A FR2212070A6 (en) 1972-08-25 1972-12-26

Publications (1)

Publication Number Publication Date
GB1461590A true GB1461590A (en) 1977-01-13

Family

ID=26217290

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5904273A Expired GB1461590A (en) 1972-08-25 1973-12-20 Reproducing device

Country Status (3)

Country Link
DE (1) DE2342906C2 (en)
FR (1) FR2212070A6 (en)
GB (1) GB1461590A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4868808A (en) * 1972-08-25 1989-09-19 Thomson-Csf Optical disk arrangement with closed contours whose entire extent represents information

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2311326A2 (en) * 1974-01-15 1976-12-10 Thomson Brandt Optical data reader with focussing appts. - has combined detector for track alignment and data reading
DE2418195A1 (en) * 1974-04-13 1975-11-06 Bosch Gmbh Robert METHOD FOR GUIDING A BEAM OF LIGHT ON A SIGNAL TRACK
NL7413162A (en) * 1974-10-07 1976-04-09 Philips Nv DEVICE FOR READING A DISK-SHAPED RECORDING CARRIER.
NL182990C (en) * 1975-07-07 1988-06-16 Philips Nv DEVICE FOR READING A RADIATION-REFLECTING RECORD CARRIER.
FR2325987A1 (en) * 1975-09-29 1977-04-22 Thomson Brandt OPTICAL READING DEVICE FOR A RECORDING
JPS5263793A (en) * 1975-11-21 1977-05-26 Pioneer Electronic Corp Optical signal reader
US4030835A (en) * 1976-05-28 1977-06-21 Rca Corporation Defect detection system
JPS5398802A (en) * 1977-02-09 1978-08-29 Mitsubishi Electric Corp Optical reproducer
AU520835B2 (en) * 1977-03-24 1982-03-04 World Development Laboratories Optical recording system and method
JPS57111837A (en) * 1980-12-27 1982-07-12 Olympus Optical Co Ltd Signal detecting system of optical information reader
JPS58125242A (en) * 1982-01-22 1983-07-26 Victor Co Of Japan Ltd Tracking error detecting system of optical information signal reproducing device
DE3827541A1 (en) * 1988-08-13 1990-02-15 Mtu Muenchen Gmbh Method for the automatic read-out of binary encoded information
US5396477A (en) * 1988-09-21 1995-03-07 Hitachi, Ltd. Light spot positioning method and optical disc memory apparatus employing the same
US10226891B2 (en) 2016-08-01 2019-03-12 The Boeing Company Methods, system and apparatuses for in situ removal of window distortion

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3328776A (en) * 1959-08-21 1967-06-27 Gen Electric Thermoplastic film tape recorder
US3381086A (en) * 1962-08-16 1968-04-30 Minnesota Mining & Mfg Reproduction of television signals from photographic disc recordings
DE1185233B (en) * 1962-09-28 1965-01-14 Siemens Ag Optical-electronic converter for deriving electrical signals from stored information associated with thickness differences of a deformable, preferably thermoplastic, storage medium
US3287563A (en) * 1962-11-07 1966-11-22 Minnesota Mining & Mfg Spatial coherent reproducing system
US3262122A (en) * 1963-05-01 1966-07-19 Ibm Thermoplastic memory
US3391247A (en) * 1964-01-03 1968-07-02 Minnesota Mining & Mfg Television signal recording with sampled audio recorded during horizontal intervals
DE1277344B (en) * 1964-07-06 1968-09-12 Siemens Ag Procedure for information storage and memory storage for carrying out the procedure
US3430966A (en) * 1967-04-03 1969-03-04 Gauss Electrophysics Inc Transparent recording disc
US3530258A (en) * 1968-06-28 1970-09-22 Mca Technology Inc Video signal transducer having servo controlled flexible fiber optic track centering
US3638185A (en) * 1969-03-17 1972-01-25 Precision Instr Co High-density permanent data storage and retrieval system
US3654624A (en) * 1969-03-17 1972-04-04 Precision Instr Co Laser recording system using drum mounted record strips
DE1922464C3 (en) * 1969-04-30 1973-10-25 Ted Bildplatten Ag Aeg-Telefunkenteldec, Zug (Schweiz) Device for reflection scanning of a carrier provided with grooves
DE2031515C3 (en) * 1970-06-25 1982-04-15 Siemens AG, 1000 Berlin und 8000 München Procedure for reading out information

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4868808A (en) * 1972-08-25 1989-09-19 Thomson-Csf Optical disk arrangement with closed contours whose entire extent represents information
US5307332A (en) * 1972-08-25 1994-04-26 Thomson-Csf Optical disk arrangement with diffractive tracks and a photoelectric assembly providing positional control information

Also Published As

Publication number Publication date
FR2212070A6 (en) 1974-07-19
DE2342906A1 (en) 1974-03-07
DE2342906C2 (en) 1990-10-25

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Legal Events

Date Code Title Description
PS Patent sealed