GB1467963A - Optical projection system - Google Patents

Optical projection system

Info

Publication number
GB1467963A
GB1467963A GB1705274A GB1705274A GB1467963A GB 1467963 A GB1467963 A GB 1467963A GB 1705274 A GB1705274 A GB 1705274A GB 1705274 A GB1705274 A GB 1705274A GB 1467963 A GB1467963 A GB 1467963A
Authority
GB
United Kingdom
Prior art keywords
splitter
target
light
tube
april
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
GB1705274A
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 FR47357A external-priority patent/FR1479284A/en
Priority claimed from FR47358A external-priority patent/FR1473212A/en
Priority claimed from FR7314524A external-priority patent/FR2226794B2/fr
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1467963A publication Critical patent/GB1467963A/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
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G02B27/1026—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with reflective spatial light modulators
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
    • G02F1/0333—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect addressed by a beam of charged particles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

1467963 Controlling light PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 18 April 1974 [20 April 1973] 17052/74 Addition to 1160923 Heading G2F In a projection system wherein light from a source 22 is directed by a polarization dependent beam-splitter 124 through a variably birefringent electro-optic target 13 of a cathode ray tube 14 and is reflected back through the target to the splitter 124 so that an electrical charge pattern laid down on the target is converted into spatial intensity variations in that portion of the light directed by the beam-splitter towards a screen 127, a projection objective is provided which consists of parts 125 and 126, part 125 acting as a collimator for light incident on the target and determining the power of the objective, and part 126 being disposed after the splitter and correcting for optical errors introduced by part 125. By this means all the components of part 125 may be of the same material, with a small coefficient of expansion, e.g. SiO 2 , whereby mechanical stress introduced by the heating effect of the light beam do not give rise to appreciable changes in the polarization of transmitted light. Part 126 corrects for colour aberrations and may consist of two crown and flint lens combinations. Since it occurs after the splitter 124, stress induced birefringence is unimportant. It may form a non-focal combination with a magnification of substantially unity. As particularly described beam-splitter 124 is a Wollaston prism and the target is of KDP. In a second embodiment, Fig. 2 (not shown), three tubes 14 are provided for respective primary colour images, dichroic mirrors being provided one between the part 125 and the tube 14 of Fig. 1, and one between part 125 and the splitter 124 for the two respective additional tubes. A further optical element, equivalent in function to part 125 is disposed between the latter dichroic mirror and its tube.
GB1705274A 1966-01-26 1974-04-18 Optical projection system Expired GB1467963A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR47357A FR1479284A (en) 1966-01-26 1966-01-26 Optical relay, especially for television projectors
FR47358A FR1473212A (en) 1966-01-26 1966-01-26 Optical relay applicable to television
FR7314524A FR2226794B2 (en) 1966-01-26 1973-04-20

Publications (1)

Publication Number Publication Date
GB1467963A true GB1467963A (en) 1977-03-23

Family

ID=27242842

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1705274A Expired GB1467963A (en) 1966-01-26 1974-04-18 Optical projection system

Country Status (2)

Country Link
DE (1) DE2418220C3 (en)
GB (1) GB1467963A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5845981A (en) * 1997-12-29 1998-12-08 Philips Electronics North America Corporation Multi-color-band scrolling across single-panel light valve
US5892623A (en) * 1997-12-29 1999-04-06 Philips Electronics North America Mutli-color-band light source

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2031354B2 (en) * 1969-02-05 1973-11-16 Labo Electronique Physique
FR1479284A (en) * 1966-01-26 1967-05-05 Electronique & Physique Optical relay, especially for television projectors
FR94805E (en) * 1966-01-26 1969-11-28 Electronique & Physique Optical relay, in particular for television projectors.
DE1512337C3 (en) * 1966-01-26 1975-07-03 N.V. Philips' Gloeilampenfabrieken, Eindhoven (Niederlande) Optical relay device, in particular for television purposes
FR95336E (en) * 1966-01-26 1970-08-21 Electronique & Physique Optical relay, in particular for television projectors.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5845981A (en) * 1997-12-29 1998-12-08 Philips Electronics North America Corporation Multi-color-band scrolling across single-panel light valve
US5892623A (en) * 1997-12-29 1999-04-06 Philips Electronics North America Mutli-color-band light source

Also Published As

Publication number Publication date
DE2418220A1 (en) 1974-11-14
DE2418220B2 (en) 1981-08-13
DE2418220C3 (en) 1982-11-11

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee