GB1389831A - Production of records - Google Patents

Production of records

Info

Publication number
GB1389831A
GB1389831A GB529371A GB529371A GB1389831A GB 1389831 A GB1389831 A GB 1389831A GB 529371 A GB529371 A GB 529371A GB 529371 A GB529371 A GB 529371A GB 1389831 A GB1389831 A GB 1389831A
Authority
GB
United Kingdom
Prior art keywords
record
information
medium
laser
depth
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
GB529371A
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Priority to GB529371A priority Critical patent/GB1389831A/en
Priority to DE19722209332 priority patent/DE2209332A1/en
Priority to IT20923/72A priority patent/IT947823B/en
Priority to NL7202468A priority patent/NL7202468A/xx
Priority to FR7206264A priority patent/FR2126387A1/fr
Publication of GB1389831A publication Critical patent/GB1389831A/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
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/03—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by deforming with non-mechanical means, e.g. laser, beam of particles
    • G11B11/06—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by deforming with non-mechanical means, e.g. laser, beam of particles with reproducing by mechanical sensing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0057—Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure ; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture

Abstract

1389831 Recording system EMI Ltd 16 Feb 1972 [24 Feb 1971 20 July 1971 5 Aug 1971 1 Dec 1971 23 Dec 1971] 5293/71 34000/71 36746/71 55662/71 and 59896/71 Heading G5R Apparatus for recording information on a medium comprises a leading element for preparing the medium, e.g. by grooving or planing and coupled thereto a second element incorporating a laser for deforming the prepared surface in response to the information. As described, the medium is a recording disc and the information can be in the form of a frequency or amplitude modulated signal. The recording disc which can be a lacquer layer 2 on aluminium base 21 is prepared by a leading element (not shown) which forms the grooves 5 of such depth that the ridges 4 are below the original surface. The second element includes the laser 25, the beam 24 of which acts on the medium via a Pockel cell which modulates the beam with the information to be recorded. The ridges 18, 19, 20 of the record are deformed by the laser beam such that when a positive record is formed the deformations lie at the bottom of the grooves. Alternatively the beam can deform the groove base directly. The elements are coupled and are moved relative to the record along paths parallel to a record radius, Fig. 3 (not shown), and arrangements are provided, Figs. 6-8 (not shown), for focussing and maintaining the focussing of the laser beam. Sufficient depth of focus being provided to maintain the beam intensity constant over the cutting or deforming depth. A stream of nitrogen can be used to disperse the particles removed from the record surface. The record can be played back by a stylus or an optical sensing transducer.
GB529371A 1971-02-24 1971-02-24 Production of records Expired GB1389831A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB529371A GB1389831A (en) 1971-02-24 1971-02-24 Production of records
DE19722209332 DE2209332A1 (en) 1971-02-24 1972-02-23 Method and device for recording information on a recording medium
IT20923/72A IT947823B (en) 1971-02-24 1972-02-23 PROCEDURE AND EQUIPMENT FOR RECORDING INFORMATION ON PHONOGRAPH RECORDS
NL7202468A NL7202468A (en) 1971-02-24 1972-02-24
FR7206264A FR2126387A1 (en) 1971-02-24 1972-02-24

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB529371A GB1389831A (en) 1971-02-24 1971-02-24 Production of records
GB3400071 1971-07-20
GB3674671 1971-08-05
GB5566271 1971-12-01
GB5989671 1971-12-23

Publications (1)

Publication Number Publication Date
GB1389831A true GB1389831A (en) 1975-04-09

Family

ID=27515772

Family Applications (1)

Application Number Title Priority Date Filing Date
GB529371A Expired GB1389831A (en) 1971-02-24 1971-02-24 Production of records

Country Status (5)

Country Link
DE (1) DE2209332A1 (en)
FR (1) FR2126387A1 (en)
GB (1) GB1389831A (en)
IT (1) IT947823B (en)
NL (1) NL7202468A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521876A (en) * 1979-10-18 1985-06-04 Victor Company Of Japan, Limited Focusing state monitoring apparatus in optical recording apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5687239A (en) * 1979-12-18 1981-07-15 Matsushita Electric Ind Co Ltd Optical recording and reproducing device
FR2474222A1 (en) * 1980-01-23 1981-07-24 Thomson Csf METHOD FOR THERMO-OPTICAL INFORMATION REGISTRATION AND INFORMATION CARRIER FOR IMPLEMENTING SAID METHOD
FR2474223A1 (en) * 1980-01-23 1981-07-24 Thomson Csf METHOD FOR THERMO-OPTICAL INFORMATION REGISTRATION AND INFORMATION CARRIER FOR IMPLEMENTING SAID METHOD
JPS57105828A (en) * 1980-12-19 1982-07-01 Matsushita Electric Ind Co Ltd Optical disk recording and reproducing system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4521876A (en) * 1979-10-18 1985-06-04 Victor Company Of Japan, Limited Focusing state monitoring apparatus in optical recording apparatus

Also Published As

Publication number Publication date
DE2209332A1 (en) 1972-09-07
FR2126387A1 (en) 1972-10-06
NL7202468A (en) 1972-08-28
IT947823B (en) 1973-05-30

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees