GB1235344A - Improvements relating to optical correction systems - Google Patents

Improvements relating to optical correction systems

Info

Publication number
GB1235344A
GB1235344A GB58580/68A GB5858068A GB1235344A GB 1235344 A GB1235344 A GB 1235344A GB 58580/68 A GB58580/68 A GB 58580/68A GB 5858068 A GB5858068 A GB 5858068A GB 1235344 A GB1235344 A GB 1235344A
Authority
GB
United Kingdom
Prior art keywords
limb
plate
dec
tubes
facets
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
GB58580/68A
Inventor
Walter Thompson Welford
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.)
HARRIES ELECTRONIC CORP
Original Assignee
HARRIES ELECTRONIC CORP
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 HARRIES ELECTRONIC CORP filed Critical HARRIES ELECTRONIC CORP
Priority to GB58580/68A priority Critical patent/GB1235344A/en
Priority to CA069011A priority patent/CA926993A/en
Priority to US882051A priority patent/US3634617A/en
Priority to NL6918416A priority patent/NL6918416A/xx
Priority to BR214882/69A priority patent/BR6914882D0/en
Priority to FR6942437A priority patent/FR2025773A1/fr
Priority to BE742901D priority patent/BE742901A/xx
Priority to DE1961940A priority patent/DE1961940C3/en
Publication of GB1235344A publication Critical patent/GB1235344A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/18—Picture reproducers using cathode ray tubes using separate electron beams for the primary colour signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

1,235,344. Colour television. HARRIES ELECTRONICS CORP. 2 Dec., 1969 [10 Dec., 1968], No. 58580/68. Heading H4F. [Also in Division G2] In a colour television system, three tubes 2, 4 and one obscured, produce coloured component images at phosphor screens 10 and the images are projected by concave reflectors 12 through stops 14 to meniscus lenses 16 and are then superimposed on the viewing screen 8. The tubes are arranged symmetrically about the axis of the viewing screen and to prevent keystone distortion a transparent facetted composite corrector plate 6 is positioned as shown. The plate has three limbs and each limb intercepts a projected light beam. Each limb comprises a series of parallel strip facets arranged at right angles to the line which bisects the limb and passes through the central axis of the composite plate 6, and one surface of each strip varies in curvature from point to point in a continuous manner whilst there exist abrupt discontinuities of slope at the junctions between strips. The gradients of, and discontinuities between, the facets are carefully designed to eliminate keystone distortion. A four tube, four limbed corrector plate system is also described.
GB58580/68A 1968-12-10 1968-12-10 Improvements relating to optical correction systems Expired GB1235344A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB58580/68A GB1235344A (en) 1968-12-10 1968-12-10 Improvements relating to optical correction systems
CA069011A CA926993A (en) 1968-12-10 1969-12-04 Optical correction systems
US882051A US3634617A (en) 1968-12-10 1969-12-04 Facetted correction lens for minimizing keystoning of off-axis projectors
NL6918416A NL6918416A (en) 1968-12-10 1969-12-08
BR214882/69A BR6914882D0 (en) 1968-12-10 1969-12-09 IMPROVEMENTS RELATING TO OPTICAL CORRECTION SYSTEMS
FR6942437A FR2025773A1 (en) 1968-12-10 1969-12-09
BE742901D BE742901A (en) 1968-12-10 1969-12-10
DE1961940A DE1961940C3 (en) 1968-12-10 1969-12-10 Projection arrangement for color television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB58580/68A GB1235344A (en) 1968-12-10 1968-12-10 Improvements relating to optical correction systems

Publications (1)

Publication Number Publication Date
GB1235344A true GB1235344A (en) 1971-06-09

Family

ID=10481951

Family Applications (1)

Application Number Title Priority Date Filing Date
GB58580/68A Expired GB1235344A (en) 1968-12-10 1968-12-10 Improvements relating to optical correction systems

Country Status (8)

Country Link
US (1) US3634617A (en)
BE (1) BE742901A (en)
BR (1) BR6914882D0 (en)
CA (1) CA926993A (en)
DE (1) DE1961940C3 (en)
FR (1) FR2025773A1 (en)
GB (1) GB1235344A (en)
NL (1) NL6918416A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2222266A (en) * 1988-08-13 1990-02-28 Canon Kk Light emission for focus detection
GB2370371A (en) * 2000-12-22 2002-06-26 Infrared Integrated Syst Ltd Imaging system having a distorting optical element

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810221A (en) * 1971-11-11 1974-05-07 Polaroid Corp Viewfinder for a reflex camera
JPS53138326A (en) * 1977-05-09 1978-12-02 Sony Corp Projector
US4544946A (en) * 1983-04-21 1985-10-01 Rca Corporation Vertical color shift correction in a rear projection television screen
US4683467A (en) * 1983-12-01 1987-07-28 Hughes Aircraft Company Image registration system
DE3732002A1 (en) * 1987-09-23 1989-04-06 Gerald Dipl Phys Meyer Colour television projection device with automatic correction of picture geometry and colour convergence
US5136428A (en) * 1991-06-03 1992-08-04 At&T Bell Laboratories Flat-plate optical device having a gradient index of refraction for correcting spatial distortions

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115544A (en) * 1956-04-25 1963-12-24 Hazeltine Research Inc Color-television receivers and deflection yokes
US2989584A (en) * 1956-12-07 1961-06-20 Rca Corp Three tube color projection system with skew correction
NL113246C (en) * 1958-02-08
US2999126A (en) * 1958-05-29 1961-09-05 Harries Television Res Ltd Facetted correction lens for minimizing keystoning of off-axis projectors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2222266A (en) * 1988-08-13 1990-02-28 Canon Kk Light emission for focus detection
GB2222266B (en) * 1988-08-13 1993-03-17 Canon Kk Apparatus and auxiliary device for focus detection and a camera incorporating the same
US5459551A (en) * 1988-08-13 1995-10-17 Canon Kabushiki Kaisha Light emission device for focus detection having a chart and an illuminator
GB2370371A (en) * 2000-12-22 2002-06-26 Infrared Integrated Syst Ltd Imaging system having a distorting optical element
GB2370371B (en) * 2000-12-22 2002-11-27 Infrared Integrated Syst Ltd Use of distorting optics in imaging systems
US7008063B2 (en) 2000-12-22 2006-03-07 Infrared Integrated Systems Limited Use of distorting optics in imaging systems

Also Published As

Publication number Publication date
US3634617A (en) 1972-01-11
DE1961940B2 (en) 1979-01-04
DE1961940A1 (en) 1970-09-10
NL6918416A (en) 1970-06-12
FR2025773A1 (en) 1970-09-11
DE1961940C3 (en) 1979-08-30
BR6914882D0 (en) 1973-03-08
BE742901A (en) 1970-06-10
CA926993A (en) 1973-05-22

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