GB1392796A – Optical signal reproducing apparatus
– Google Patents
GB1392796A – Optical signal reproducing apparatus
– Google Patents
Optical signal reproducing apparatus
Info
Publication number
GB1392796A
GB1392796A
GB2595973A
GB2595973A
GB1392796A
GB 1392796 A
GB1392796 A
GB 1392796A
GB 2595973 A
GB2595973 A
GB 2595973A
GB 2595973 A
GB2595973 A
GB 2595973A
GB 1392796 A
GB1392796 A
GB 1392796A
Authority
GB
United Kingdom
Prior art keywords
groove
incident beam
optical
detectors
disc
Prior art date
1972-05-31
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
GB2595973A
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.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co 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.)
1972-05-31
Filing date
1973-05-31
Publication date
1975-04-30
1972-05-31
Priority claimed from JP47053324A
external-priority
patent/JPS4911107A/ja
1972-06-12
Priority claimed from JP47057691A
external-priority
patent/JPS4918304A/ja
1972-07-20
Priority claimed from JP7199972A
external-priority
patent/JPS4932604A/ja
1972-07-20
Priority claimed from JP47071998A
external-priority
patent/JPS5117460B2/ja
1973-05-31
Application filed by Tokyo Shibaura Electric Co Ltd
filed
Critical
Tokyo Shibaura Electric Co Ltd
1975-04-30
Publication of GB1392796A
publication
Critical
patent/GB1392796A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
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
G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
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
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
G11B7/24073—Tracks
G11B7/24082—Meandering
Abstract
1392796 Optical playback apparatus TOKYO SHIBAURA ELECTRIC CO Ltd 31 May 1973 [31 May 1972 12 June 1972 20 July 1972 (2)] 25959/73 Heading G5R Optical apparatus for reproducing signals, particularly video signals, recorded as sinusoidal undulations in a groove comprises a source 11, e.g. a laser, emitting a beam 10 of coherent light which has a width along the groove no greater than the pitch of the undulations, which is of the order of microns; and detectors 21 for detecting reflected light. The incident beam is normal to disc 20 and is focused by a cylindrical lens 19 to a band extending transverse to the groove and of equal width. The two detectors 21 are spaced apart along one groove and comprise bundles of optical fibres directed at the illuminated area and forming an angle of at least 15 degrees with the incident beam. The difference in outputs from photo-multipliers 23 is derived by a circuit 25. The beam is centred laterally on the groove by means of two phototransistors 22 spaced radially, their difference signal derived at 26 controlling a reflector 16 to shift the incident beam. The record medium may be disc or tape.
GB2595973A
1972-05-31
1973-05-31
Optical signal reproducing apparatus
Expired
GB1392796A
(en)
Applications Claiming Priority (4)
Application Number
Priority Date
Filing Date
Title
JP47053324A
JPS4911107A
(en)
1972-05-31
1972-05-31
JP47057691A
JPS4918304A
(en)
1972-06-12
1972-06-12
JP7199972A
JPS4932604A
(en)
1972-07-20
1972-07-20
JP47071998A
JPS5117460B2
(en)
1972-07-20
1972-07-20
Publications (1)
Publication Number
Publication Date
GB1392796A
true
GB1392796A
(en)
1975-04-30
Family
ID=27462888
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB2595973A
Expired
GB1392796A
(en)
1972-05-31
1973-05-31
Optical signal reproducing apparatus
Country Status (3)
Country
Link
US
(1)
US3860766A
(en)
DE
(1)
DE2328114A1
(en)
GB
(1)
GB1392796A
(en)
Families Citing this family (15)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4703467A
(en)
*
1972-10-24
1987-10-27
Discovision Associates
Video disc read back scanner
JPS5415727B2
(en)
*
1973-02-02
1979-06-16
NL7314267A
(en)
*
1973-10-17
1975-04-21
Philips Nv
REGISTRATION CARRIER ON WHICH INFORMATION HAS BEEN MADE IN AN OPTICALLY READABLE STRUCTURE.
US4038679A
(en)
*
1974-02-14
1977-07-26
U.S. Philips Corporation
Apparatus for reading an optically recorded record carrier provided with periodic surface undulations and for deriving a focussing control signal from such surface undulations
US3992593A
(en)
*
1974-08-22
1976-11-16
Heine William K
Disc phonograph record playback by laser generated diffraction pattern
USRE30723E
(en)
*
1974-08-22
1981-08-25
Disc phonograph record playback by laser generated diffraction pattern
US4065786A
(en)
*
1975-09-30
1977-12-27
Rca Corporation
Videodisc playback system
JPS5953612B2
(en)
*
1975-11-19
1984-12-26
カブシキガイシヤ フジテレビジヨン
Kodenshikisai Seihouhou
US4155098A
(en)
*
1977-06-28
1979-05-15
Rca Corporation
Groove depth estimation system using diffractive groove effects
US4180830A
(en)
*
1977-06-28
1979-12-25
Rca Corporation
Depth estimation system using diffractive effects of the grooves and signal elements in the grooves
US4504934A
(en)
*
1980-05-02
1985-03-12
Matsushita Electric Industrial Co., Ltd.
Optical signal reproducing apparatus
CA1159150A
(en)
*
1980-10-20
1983-12-20
Richard L. Wilkinson
Video recorder-playback machine
JPS57105828A
(en)
*
1980-12-19
1982-07-01
Matsushita Electric Ind Co Ltd
Optical disk recording and reproducing system
JPS59227039A
(en)
*
1983-06-07
1984-12-20
Matsushita Electric Ind Co Ltd
Recording and reproducing master disk preparing device
US4870631A
(en)
*
1986-05-30
1989-09-26
Finial Technology, Inc.
Optical turntable system with reflected spot position detection
Family Cites Families (8)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3138669A
(en)
*
1961-06-06
1964-06-23
Rabinow Jacob
Record player using light transducer and servo
US3325603A
(en)
*
1963-02-20
1967-06-13
Rabinow Jacob
Stereo record player using optical means separate from the tone arm
US3452163A
(en)
*
1965-12-08
1969-06-24
Phillip B Dahlen
Optical phonograph apparatus with polarized light
US3530258A
(en)
*
1968-06-28
1970-09-22
Mca Technology Inc
Video signal transducer having servo controlled flexible fiber optic track centering
DE1810984A1
(en)
*
1968-11-26
1970-06-11
Dual Gebrueder Steidinger
Photoelectric pickup
US3699478A
(en)
*
1969-05-26
1972-10-17
Bell Telephone Labor Inc
Display system
US3781700A
(en)
*
1971-02-11
1973-12-25
Univ Leland Stanford Junior
Optical element system and method for amplifying image forming light rays
US3727062A
(en)
*
1972-03-10
1973-04-10
Zenith Radio Corp
Acousto-optic information translation system with reference beam for control purposes
1973
1973-05-31
GB
GB2595973A
patent/GB1392796A/en
not_active
Expired
1973-05-31
US
US365752A
patent/US3860766A/en
not_active
Expired – Lifetime
1973-06-01
DE
DE2328114A
patent/DE2328114A1/en
not_active
Ceased
Also Published As
Publication number
Publication date
US3860766A
(en)
1975-01-14
DE2328114A1
(en)
1973-12-06
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Legal Events
Date
Code
Title
Description
1975-09-10
PS
Patent sealed [section 19, patents act 1949]
1982-02-17
746
Register noted ‘licences of right’ (sect. 46/1977)
1987-01-28
PCNP
Patent ceased through non-payment of renewal fee
