GB1506256A - Temperature sensitive switch - Google Patents

Temperature sensitive switch

Info

Publication number
GB1506256A
GB1506256A GB3477775A GB3477775A GB1506256A GB 1506256 A GB1506256 A GB 1506256A GB 3477775 A GB3477775 A GB 3477775A GB 3477775 A GB3477775 A GB 3477775A GB 1506256 A GB1506256 A GB 1506256A
Authority
GB
United Kingdom
Prior art keywords
liquid crystal
layer
sensitive switch
molecular alignment
temperature sensitive
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
GB3477775A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3477775A priority Critical patent/GB1506256A/en
Publication of GB1506256A publication Critical patent/GB1506256A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G02F1/132—Thermal activation of liquid crystals exhibiting a thermo-optic effect
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/34—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using capacitative elements
    • G01K7/343—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using capacitative elements the dielectric constant of which is temperature dependant
    • 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
    • G02F1/1313—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 specially adapted for a particular application

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Liquid Crystal (AREA)

Abstract

1506256 Temperature sensitive switch STANDARD TELEPHONES & CABLES Ltd 21 Aug 1975 34777/75 Heading G1N A temperature sensitive switch includes a capacitance charge sensitive switching circuit which comprises a layer of liquid crystal medium interposed between a pair of electrodes, the liquid crystal medium having a molecular alignment beneath the liquid crystal-isotropic liquid phase transition temperature such that the dielectric constant in the direction normal to the layer changes upon change of phase at the liquid crystal-isotropic liquid phase transition temperature. The molecular alignment may be produced by an electric field normal to the layer, a film of a surface molecular alignment agent on each electrode rubbed to provide alignment in a chosen direction, or on obliquely evaporated film on each electrode. The transition may be observed by irradiating the layer with polarized light. The liquid crystal may be nematic, smectic, or cholesteric. As shown the cell 20 formed by electroded glass walls with the layer therbetween is positioned in the circuit of an oscillator 22, the output thereof being fed to a threshold detector 24 via a filter 23.
GB3477775A 1975-08-21 1975-08-21 Temperature sensitive switch Expired GB1506256A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3477775A GB1506256A (en) 1975-08-21 1975-08-21 Temperature sensitive switch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3477775A GB1506256A (en) 1975-08-21 1975-08-21 Temperature sensitive switch

Publications (1)

Publication Number Publication Date
GB1506256A true GB1506256A (en) 1978-04-05

Family

ID=10369820

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3477775A Expired GB1506256A (en) 1975-08-21 1975-08-21 Temperature sensitive switch

Country Status (1)

Country Link
GB (1) GB1506256A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2408883A1 (en) * 1977-11-10 1979-06-08 Int Standard Electric Corp LIQUID CRYSTAL DISPLAY CELL WITH INTERNAL ELECTRODES
FR2408884A1 (en) * 1977-11-10 1979-06-08 Int Standard Electric Corp NEMATIC LIQUID CRYSTAL DISPLAY CELL
US4279152A (en) * 1978-03-02 1981-07-21 International Standard Electric Corporation Temperature responsive device
US4291948A (en) * 1977-11-10 1981-09-29 International Standard Electric Corporation Liquid crystal display incorporating positive and negative smectic material
EP0306604A1 (en) * 1981-09-30 1989-03-15 Siemens Aktiengesellschaft Optical control apparatus controlling rays travelling through a light guide, in particular an optical switch
WO2010097279A3 (en) * 2009-02-27 2010-11-18 Syngenta Limited Liquid crystalline temperature sensor
WO2012007347A1 (en) * 2010-07-14 2012-01-19 Syngenta Limited Temperature recorder comprising a liquid crystalline material

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2408883A1 (en) * 1977-11-10 1979-06-08 Int Standard Electric Corp LIQUID CRYSTAL DISPLAY CELL WITH INTERNAL ELECTRODES
FR2408884A1 (en) * 1977-11-10 1979-06-08 Int Standard Electric Corp NEMATIC LIQUID CRYSTAL DISPLAY CELL
US4291948A (en) * 1977-11-10 1981-09-29 International Standard Electric Corporation Liquid crystal display incorporating positive and negative smectic material
US4279152A (en) * 1978-03-02 1981-07-21 International Standard Electric Corporation Temperature responsive device
EP0306604A1 (en) * 1981-09-30 1989-03-15 Siemens Aktiengesellschaft Optical control apparatus controlling rays travelling through a light guide, in particular an optical switch
WO2010097279A3 (en) * 2009-02-27 2010-11-18 Syngenta Limited Liquid crystalline temperature sensor
CN102334018A (en) * 2009-02-27 2012-01-25 辛根塔有限公司 Sensor
JP2012519268A (en) * 2009-02-27 2012-08-23 シンジェンタ リミテッド sensor
CN102334018B (en) * 2009-02-27 2013-10-30 辛根塔有限公司 Sensor
US9016937B2 (en) 2009-02-27 2015-04-28 Syngenta Limited Sensor
EP3246679A1 (en) * 2009-02-27 2017-11-22 Syngenta Limited Sensor
WO2012007347A1 (en) * 2010-07-14 2012-01-19 Syngenta Limited Temperature recorder comprising a liquid crystalline material

Similar Documents

Publication Publication Date Title
JPS54134452A (en) Quest-host type liquid crystal display device
KR840000816A (en) Liquid crystal display device combining two addressing modes
GB1506256A (en) Temperature sensitive switch
KR920701861A (en) Ferroelectric liquid crystal display
GB2090036B (en) Liquid crystal display device
KR920702780A (en) Liquid crystal switching and display elements
JPS647022A (en) Liquid crystal element
Gähwiller Electroreflectance in barium titanate single crystals
JPS6478235A (en) Ferroelectric liquid crystal element
JPS55140818A (en) Phase transition type liquid crystal display device and its manufacture
JPS6463931A (en) Liquid crystal optical modulation device
JPS5845011B2 (en) Temperature compensation method of LCD color display device
JPS6410214A (en) Ferroelectric liquid crystal element
JPS5788434A (en) Liquid crystal device, and generating and erasing method of bubble
GB1383047A (en) Liquid crystal display devices
JPS5727238A (en) Liquid crystal display cell
JPS5727237A (en) Liquid crystal display cell
JPS5268429A (en) Liquid crystal display device
GB1534456A (en) Optical scanning device
JPS536058A (en) Photo switching element
JPS5218345A (en) Clor display unit using liquid crystal
JPS5454600A (en) Display device
JPS5490999A (en) Display panel
JPS54137361A (en) Color display device of liquid crystal
JPS5738412A (en) Liquid crystal display device

Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee