GB1529227A - Optical viewing systems - Google Patents

Optical viewing systems

Info

Publication number
GB1529227A
GB1529227A GB2513475A GB2513475A GB1529227A GB 1529227 A GB1529227 A GB 1529227A GB 2513475 A GB2513475 A GB 2513475A GB 2513475 A GB2513475 A GB 2513475A GB 1529227 A GB1529227 A GB 1529227A
Authority
GB
United Kingdom
Prior art keywords
field
liquid crystal
detectors
image
view
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
GB2513475A
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.)
British Aircraft Corp Ltd
Original Assignee
British Aircraft Corp 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 British Aircraft Corp Ltd filed Critical British Aircraft Corp Ltd
Priority to GB2513475A priority Critical patent/GB1529227A/en
Publication of GB1529227A publication Critical patent/GB1529227A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
    • G01S3/781—Details
    • 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
    • G02B27/01—Head-up displays
    • 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 
    • G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/135—Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied
    • 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
    • G02B27/01—Head-up displays
    • G02B27/0101—Head-up displays characterised by optical features
    • G02B2027/0138—Head-up displays characterised by optical features comprising image capture systems, e.g. camera

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
  • Liquid Crystal (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

1529227 Detecting movement photoelectrically BRITISH AIRCRAFT CORP Ltd 3 Sept 1976 [12 June 1975] 25134/75 Heading H4D To detect when a change occurs in a field of view, the field of view is viewed by one or more photodetectors 4, Fig. 1 via a liquid crystal arrangement 3 which varies its spatial opacity so as to duplicate the image of the field. Any change in the field of view leads to a darkening of the image as seen by the detectors. Use of one detector indicates movement somewhere in the field-a plurality of detectors enables the determination of the position of the movement. The liquid crystal arrangement, Fig. 2, comprises a cholesteric liquid crystal 13 containing a pleochroic dye, sandwiched between two transparent electrode (8, 9) bearing glass plates 7, 6. The rear electrode has the potential applied to the 1./c. material varied by a photoconductive layer 12 such that a bright part of the image causes reduced resistance, a higher potential and field and more local 1./c. material-dye orientation with reduced opacity. A red biasing light source 14 does not affect the layer 12, but adds to the illumination falling on the detectors 4 so that they operate at optimum level.
GB2513475A 1976-09-03 1976-09-03 Optical viewing systems Expired GB1529227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2513475A GB1529227A (en) 1976-09-03 1976-09-03 Optical viewing systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2513475A GB1529227A (en) 1976-09-03 1976-09-03 Optical viewing systems

Publications (1)

Publication Number Publication Date
GB1529227A true GB1529227A (en) 1978-10-18

Family

ID=10222760

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2513475A Expired GB1529227A (en) 1976-09-03 1976-09-03 Optical viewing systems

Country Status (1)

Country Link
GB (1) GB1529227A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296710A3 (en) * 1987-06-23 1989-10-25 Kaiser Aerospace And Electronics Corporation Heads-up display combiner utilizing a cholesteric liquid crystal element
US4900133A (en) * 1988-10-27 1990-02-13 Kaiser Electronics Heads-up display combiner utilizing a cholesteric liquid crystal element
WO2008017315A1 (en) * 2006-08-08 2008-02-14 Gm Global Technology Operations, Inc. Image reproducing device and operating method therefore

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0296710A3 (en) * 1987-06-23 1989-10-25 Kaiser Aerospace And Electronics Corporation Heads-up display combiner utilizing a cholesteric liquid crystal element
US4900133A (en) * 1988-10-27 1990-02-13 Kaiser Electronics Heads-up display combiner utilizing a cholesteric liquid crystal element
WO2008017315A1 (en) * 2006-08-08 2008-02-14 Gm Global Technology Operations, Inc. Image reproducing device and operating method therefore

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930903