GB1387304A - Information carrier of disc form for sound and/or video signals - Google Patents

Information carrier of disc form for sound and/or video signals

Info

Publication number
GB1387304A
GB1387304A GB1079172A GB1079172A GB1387304A GB 1387304 A GB1387304 A GB 1387304A GB 1079172 A GB1079172 A GB 1079172A GB 1079172 A GB1079172 A GB 1079172A GB 1387304 A GB1387304 A GB 1387304A
Authority
GB
United Kingdom
Prior art keywords
disc
sound
video signals
information carrier
march
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
GB1079172A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1387304A publication Critical patent/GB1387304A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/7605—Television signal recording on discs or drums
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • 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
    • 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
    • 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
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B2007/13727—Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Testing Of Coins (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

1387304 Optical recording and playback PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 8 March 1972 [11 March 1971] 10791/72 Heading G5R A disc 1 of transparent non-diffusing material carries optically-readable recordings 3, 4, 5 lying substantially in two or more mutually parallel planes at different depths in the disc. A playback beam 22, Fig. 4, is selectively focused on a chosen recording plane, e.g. by the insertion of one of alternative plates 20, 20a rotatable about a spindle 21. Recording tracks may differ in colour, being selectively played back with the aid of filters.
GB1079172A 1971-03-11 1972-03-08 Information carrier of disc form for sound and/or video signals Expired GB1387304A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7103233A NL7103233A (en) 1971-03-11 1971-03-11

Publications (1)

Publication Number Publication Date
GB1387304A true GB1387304A (en) 1975-03-12

Family

ID=19812661

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1079172A Expired GB1387304A (en) 1971-03-11 1972-03-08 Information carrier of disc form for sound and/or video signals

Country Status (13)

Country Link
JP (1) JPS5213733B1 (en)
BE (1) BE780451A (en)
CA (1) CA953419A (en)
CH (1) CH558053A (en)
DK (1) DK133449B (en)
ES (2) ES400596A1 (en)
FR (1) FR2129626A5 (en)
GB (1) GB1387304A (en)
IT (1) IT952934B (en)
NL (1) NL7103233A (en)
NO (1) NO138162C (en)
SE (1) SE396493B (en)
ZA (1) ZA72928B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4161752A (en) * 1977-06-28 1979-07-17 International Business Machines Corporation High density video disk having two pit depths
NL7803517A (en) * 1978-04-03 1979-10-05 Philips Nv RECORD CARRIER WITH AN OPTICALLY READABLE PHASE STRUCTURE AND DEVICE FOR READING.
FR2442487A2 (en) * 1978-11-21 1980-06-20 Thomson Brandt Automatic focussing for optical reading of video disc - using electromagnetic assembly with windings to control lens position
JPH0665950U (en) * 1991-07-22 1994-09-16 勉 宮崎 Optical reader
FR2750528A1 (en) * 1996-06-28 1998-01-02 Thomson Multimedia Sa OPTICAL DISC COMPATIBLE WITH TWO DIFFERENT READING SYSTEMS

Also Published As

Publication number Publication date
NO138162B (en) 1978-04-03
ES400596A1 (en) 1975-07-16
DE2209761A1 (en) 1972-09-21
DE2209761B2 (en) 1976-02-12
ZA72928B (en) 1973-09-26
FR2129626A5 (en) 1972-10-27
CH558053A (en) 1975-01-15
BE780451A (en) 1972-09-11
DK133449B (en) 1976-05-17
JPS5213733B1 (en) 1977-04-16
CA953419A (en) 1974-08-20
IT952934B (en) 1973-07-30
SE396493B (en) 1977-09-19
NL7103233A (en) 1972-09-13
ES427857A1 (en) 1977-07-01
NO138162C (en) 1978-07-12
DK133449C (en) 1977-03-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee