GB1285108A - Method and device for reproducing signals stored on a transparent medium - Google Patents

Method and device for reproducing signals stored on a transparent medium

Info

Publication number
GB1285108A
GB1285108A GB54233/70A GB5423370A GB1285108A GB 1285108 A GB1285108 A GB 1285108A GB 54233/70 A GB54233/70 A GB 54233/70A GB 5423370 A GB5423370 A GB 5423370A GB 1285108 A GB1285108 A GB 1285108A
Authority
GB
United Kingdom
Prior art keywords
record
recorded
nov
modulated
signals stored
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
GB54233/70A
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 DE19691958858 external-priority patent/DE1958858C3/en
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Publication of GB1285108A publication Critical patent/GB1285108A/en
Expired 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
    • 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

Landscapes

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

Abstract

1285108 Optical playback of topographical records LICENTIA PATENT-VEKWALTUNGS-GmbH 13 Nov 1970 [15 Nov 1969] 54233/70 Heading G5R A record 2 having signals recorded thereon as surface deformations is played back by means of the reflection or, as shown, refraction of a beam of light or ultra-violet radiation, of which the width, measured in the direction of movement of the record, is less than the shortest wavelength recorded and preferably less than half this wavelength. The signal to be recorded is preferably frequency-modulated or phase-modulated on to a carrier to produce a triangular hill-and-dale waveform on the record 2, Fig. 6 (not shown). The playback beam may be produced by a laser or by an optical system including a slit comprising a glass foil 7 having a refractive index higher than that of the adhesive or glass melt 10 securing it to its mount 9.
GB54233/70A 1969-11-15 1970-11-13 Method and device for reproducing signals stored on a transparent medium Expired GB1285108A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691958858 DE1958858C3 (en) 1969-11-15 Device for light scanning a carrier with grooves

Publications (1)

Publication Number Publication Date
GB1285108A true GB1285108A (en) 1972-08-09

Family

ID=5751873

Family Applications (1)

Application Number Title Priority Date Filing Date
GB54233/70A Expired GB1285108A (en) 1969-11-15 1970-11-13 Method and device for reproducing signals stored on a transparent medium

Country Status (4)

Country Link
US (1) US3764759A (en)
JP (1) JPS4917046B1 (en)
FR (1) FR2069448A5 (en)
GB (1) GB1285108A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856108A (en) * 1972-08-25 1989-08-08 Thomson-Csf Optical arrangement and a reading apparatus including detection of data elements diffractive along entire extent

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010317A (en) * 1972-03-29 1977-03-01 U.S. Philips Corporation Apparatus for reading a record carrier in which information, for example video and/or audio information, is recorded in at least one track
NL161284C (en) * 1972-09-02 1980-01-15 Philips Nv DISPLAY SYSTEM FOR AN OPTICALLY READABLE INFORMATION STRUCTURE AND RECORD CARRIAGE FOR USE THEREIN.
US3919562A (en) * 1974-05-20 1975-11-11 Zenith Radio Corp Slit detector for optical detector system
JPS57125245U (en) * 1981-01-30 1982-08-04
US4534021A (en) * 1981-12-10 1985-08-06 Discovision Associates Angularly multiplexed optical recording medium
US5161134A (en) * 1989-06-29 1992-11-03 Digital Equipment Corporation Method for increasing linear bit density in magneto-optical storage media

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB304848A (en) * 1927-10-31 1929-01-31 Brenchley Ernest George Mittel Improvements in or relating to sound recording
US1917003A (en) * 1929-01-21 1933-07-04 Columbia Phono Graph Company I Reproduction of sound records
US1956626A (en) * 1931-03-14 1934-05-01 Percy A Robbins Translucent sound record
US2497142A (en) * 1941-12-18 1950-02-14 Shepherd Judson O'd Sound recorder and reproducer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4856108A (en) * 1972-08-25 1989-08-08 Thomson-Csf Optical arrangement and a reading apparatus including detection of data elements diffractive along entire extent
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
DE1958858B2 (en) 1976-03-04
FR2069448A5 (en) 1971-09-03
JPS4917046B1 (en) 1974-04-26
US3764759A (en) 1973-10-09
DE1958858A1 (en) 1971-06-03

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee