GB1479294A - Optical recording - Google Patents

Optical recording

Info

Publication number
GB1479294A
GB1479294A GB28824/74A GB2882474A GB1479294A GB 1479294 A GB1479294 A GB 1479294A GB 28824/74 A GB28824/74 A GB 28824/74A GB 2882474 A GB2882474 A GB 2882474A GB 1479294 A GB1479294 A GB 1479294A
Authority
GB
United Kingdom
Prior art keywords
areas
recorded
playback
recorded areas
radiation
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
GB28824/74A
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 GB1479294A publication Critical patent/GB1479294A/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
    • G11B7/24—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
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

1479294 Optical recording PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 28 June 1974 [2 July 1973] 28824/74 Heading G5R In an optical record and playback arrangement for disc records in which the track width is less than the diameter of the radiation playback spot and in which the average number of recorded areas g per unit length of track varies e.g. as in a video disc with a frame recorded in each turn of the track, the width of the recorded areas is increased in proportion to the increase in said average number. The arrangement is particularly described with reference to a reflecting optical record of the type having areas g which vary in length with the recorded information and which are depressed “ wavelength of the playback radiation so that an antiphase radiation is produced in the playback detector as an area g is scanned in cancelling relationship to that reflected from the land 3 between tracks and the space t between recorded areas. As the length of the recorded areas decreases the average amplitude variation of the detected signal also varies so the width of the areas j is increased to compensate. In addition the non-linearity evidenced by the detector signal dropping to more than half the difference between maximum and minimum before the start of an area reaches the mid point of the playback spot, is compensated by shaping of the leading and trailing ends of the recorded areas. Figs. 9 and 10 (not shown). Recording apparatus for the disc for producing these changes in the shape of the recorded areas is described Fig. 11 (not shown).
GB28824/74A 1973-07-02 1974-06-28 Optical recording Expired GB1479294A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NLAANVRAGE7309174,A NL172111C (en) 1973-07-02 1973-07-02 REGISTRATION CARRIER ON WHICH INFORMATION IS STORED IN AN OPTICAL STRUCTURE AND DEVICE FOR REGISTERING SUCH REGISTRATION CARRIER.

Publications (1)

Publication Number Publication Date
GB1479294A true GB1479294A (en) 1977-07-13

Family

ID=19819188

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28824/74A Expired GB1479294A (en) 1973-07-02 1974-06-28 Optical recording

Country Status (16)

Country Link
JP (1) JPS5623221B2 (en)
AT (1) AT346096B (en)
BE (1) BE817188A (en)
BR (1) BR7405448D0 (en)
CA (1) CA1039402A (en)
CH (1) CH592349A5 (en)
DE (1) DE2429850C2 (en)
DK (1) DK137735B (en)
ES (1) ES427804A1 (en)
FR (1) FR2236240B1 (en)
GB (1) GB1479294A (en)
IT (1) IT1014438B (en)
NL (1) NL172111C (en)
NO (1) NO144551C (en)
SE (1) SE402368B (en)
ZA (1) ZA744185B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125859A (en) * 1975-10-31 1978-11-14 Hitachi, Ltd. Videodisc play-back apparatus with variable width beam
US4142210A (en) * 1976-11-18 1979-02-27 Sony Corporation Rotatable record carrier and method and apparatus for producing same
US4157568A (en) * 1976-11-30 1979-06-05 Sony Corporation Method and apparatus for optically reproducing a rotatable record with a scanning light beam of changing size

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7506495A (en) * 1975-06-02 1976-12-06 Philips Nv DEVICE FOR READING A REGISTRATION MEDIA.
JPS5242034U (en) * 1975-09-18 1977-03-25
US4097895A (en) * 1976-03-19 1978-06-27 Rca Corporation Multilayer optical record
JPS54141604A (en) * 1978-04-27 1979-11-05 Nippon Columbia Optical disk and method of fabricating original disk of optical disk
CH636467A5 (en) * 1978-10-17 1983-05-31 Mca Disco Vision Method and device for recording a modulated electrical signal
NL7902363A (en) * 1979-03-27 1980-09-30 Philips Nv RECORD CARRIER WITH AN OPTICALLY READABLE INFORMASTRUCTURE.
JPH0335455Y2 (en) * 1986-01-10 1991-07-26

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4125859A (en) * 1975-10-31 1978-11-14 Hitachi, Ltd. Videodisc play-back apparatus with variable width beam
US4142210A (en) * 1976-11-18 1979-02-27 Sony Corporation Rotatable record carrier and method and apparatus for producing same
US4157568A (en) * 1976-11-30 1979-06-05 Sony Corporation Method and apparatus for optically reproducing a rotatable record with a scanning light beam of changing size

Also Published As

Publication number Publication date
NO144551B (en) 1981-06-09
FR2236240B1 (en) 1979-08-24
AT346096B (en) 1978-10-25
ATA538774A (en) 1978-02-15
NO742366L (en) 1975-01-27
ES427804A1 (en) 1976-08-01
NL7309174A (en) 1975-01-06
NL172111C (en) 1983-07-01
JPS5034508A (en) 1975-04-02
DK351274A (en) 1975-02-24
SE402368B (en) 1978-06-26
ZA744185B (en) 1976-02-25
CH592349A5 (en) 1977-10-31
DE2429850C2 (en) 1982-11-18
IT1014438B (en) 1977-04-20
BE817188A (en) 1975-01-02
JPS5623221B2 (en) 1981-05-29
DK137735C (en) 1978-10-02
NL172111B (en) 1983-02-01
CA1039402A (en) 1978-09-26
SE7408535L (en) 1975-01-03
NO144551C (en) 1981-09-16
DE2429850A1 (en) 1975-01-30
BR7405448D0 (en) 1975-04-15
AU7074274A (en) 1976-01-08
DK137735B (en) 1978-04-24
FR2236240A1 (en) 1975-01-31

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee