GB1441175A - Information record and reading apparatus therefor - Google Patents

Information record and reading apparatus therefor

Info

Publication number
GB1441175A
GB1441175A GB4111173A GB4111173A GB1441175A GB 1441175 A GB1441175 A GB 1441175A GB 4111173 A GB4111173 A GB 4111173A GB 4111173 A GB4111173 A GB 4111173A GB 1441175 A GB1441175 A GB 1441175A
Authority
GB
United Kingdom
Prior art keywords
radiation
reading apparatus
information record
apparatus therefor
sept
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
GB4111173A
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
Priority claimed from NL7211996A external-priority patent/NL7211996A/xx
Priority claimed from NL7212044A external-priority patent/NL7212044A/xx
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1441175A publication Critical patent/GB1441175A/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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam

Abstract

1441175 Recording and playback PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 31 Aug 1973 [2 Sept 1972 5 Sept 1972] 41111/73 Heading G5R A playback beam of radiation B from a source 5, e.g. a laser, impinges on a record carrier 1 in a spot V 1 wider than the track 2 being scanned and is diffracted on encountering any elements of recorded information b, e.g. pits of depth #/4 or optical marks; the path of the radiation from the record carrier 1 to a detector D includes a limiting aperture, e.g. a lens L, such that a part of any diffracted radiation falls outside it and does not affect the detector D.
GB4111173A 1972-09-02 1973-08-31 Information record and reading apparatus therefor Expired GB1441175A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7211996A NL7211996A (en) 1972-09-02 1972-09-02
NL7212044A NL7212044A (en) 1972-09-05 1972-09-05

Publications (1)

Publication Number Publication Date
GB1441175A true GB1441175A (en) 1976-06-30

Family

ID=26644797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4111173A Expired GB1441175A (en) 1972-09-02 1973-08-31 Information record and reading apparatus therefor

Country Status (15)

Country Link
JP (1) JPS5330453B2 (en)
AR (1) AR198680A1 (en)
AT (1) AT328002B (en)
BE (1) BE804328A (en)
CA (1) CA1005907A (en)
CH (1) CH569327A5 (en)
DK (1) DK135558B (en)
ES (1) ES418390A1 (en)
FR (1) FR2198203B1 (en)
GB (1) GB1441175A (en)
IT (1) IT990420B (en)
NO (1) NO141671C (en)
PL (1) PL86219B1 (en)
SE (1) SE394154B (en)
YU (1) YU39711B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1013854A (en) * 1973-02-20 1977-07-12 John S. Winslow Videodisc mastering system
FR2280150B1 (en) * 1974-07-26 1977-01-07 Thomson Brandt DEVICE FOR DETECTION OF FOCUS DEVIATION OF AN OPTICAL READING HEAD FROM A READING SURFACE
JPS5922289B2 (en) * 1975-11-20 1984-05-25 ソニー株式会社 How to get started
JPS5916331B2 (en) * 1975-11-27 1984-04-14 パイオニア株式会社 Kougakushishingouyomitrisouchi
US4097895A (en) * 1976-03-19 1978-06-27 Rca Corporation Multilayer optical record
FR2470391A1 (en) * 1979-11-21 1981-05-29 Thomson Csf STIGMATIC COHERENT RADIATION EMISSION-RECEPTION OPTICAL DEVICE AND RECORDING-READING OPTICAL HEAD COMPRISING SUCH A DEVICE
NL8004892A (en) * 1980-08-29 1982-04-01 Philips Nv APPARATUS FOR PROCESSING OPTICAL INFORMATION AND METHOD FOR MANUFACTURING A COMA CORRECTION PLATE AS APPLIED IN SUCH AN APPARATUS
JPS5997713U (en) * 1982-12-20 1984-07-02 市川毛織株式会社 skimmer
JPS6234127A (en) * 1985-08-08 1987-02-14 Konishiroku Photo Ind Co Ltd Optical modulation system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3673412A (en) * 1970-03-02 1972-06-27 Trw Inc Radiant energy beam scanning method and apparatus
JPS5443710B2 (en) * 1972-03-15 1979-12-21

Also Published As

Publication number Publication date
ES418390A1 (en) 1976-03-16
AR198680A1 (en) 1974-07-15
CA1005907A (en) 1977-02-22
YU39711B (en) 1985-04-30
DE2341824A1 (en) 1974-03-14
AU5978073A (en) 1975-03-06
ATA756073A (en) 1975-05-15
SE394154B (en) 1977-06-06
JPS4965726A (en) 1974-06-26
AT328002B (en) 1976-02-25
DK135558B (en) 1977-05-16
DE2341824B2 (en) 1976-10-14
IT990420B (en) 1975-06-20
FR2198203A1 (en) 1974-03-29
PL86219B1 (en) 1976-05-31
BE804328A (en) 1974-02-28
DK135558C (en) 1977-10-24
JPS5330453B2 (en) 1978-08-26
NO141671B (en) 1980-01-07
NO141671C (en) 1980-04-16
YU231773A (en) 1982-06-30
FR2198203B1 (en) 1979-08-03
CH569327A5 (en) 1975-11-14

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19930830