SE9503785D0 - Liquid Crystal shutter - Google Patents

Liquid Crystal shutter

Info

Publication number
SE9503785D0
SE9503785D0 SE9503785A SE9503785A SE9503785D0 SE 9503785 D0 SE9503785 D0 SE 9503785D0 SE 9503785 A SE9503785 A SE 9503785A SE 9503785 A SE9503785 A SE 9503785A SE 9503785 D0 SE9503785 D0 SE 9503785D0
Authority
SE
Sweden
Prior art keywords
liquid crystal
crystal cell
pass filter
electric field
band pass
Prior art date
Application number
SE9503785A
Other languages
Swedish (sv)
Other versions
SE516183C2 (en
SE9503785L (en
Inventor
Aake Hoernell
Stephen Palmer
Original Assignee
Hoernell Innovation Ab
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 Hoernell Innovation Ab filed Critical Hoernell Innovation Ab
Priority to SE9503785A priority Critical patent/SE516183C2/en
Publication of SE9503785D0 publication Critical patent/SE9503785D0/en
Priority to AU73567/96A priority patent/AU7356796A/en
Priority to EP96935760A priority patent/EP0957852A1/en
Priority to CN 96197859 priority patent/CN1200661A/en
Priority to PCT/SE1996/001374 priority patent/WO1997015256A1/en
Priority to JP9516547A priority patent/JPH11514457A/en
Publication of SE9503785L publication Critical patent/SE9503785L/en
Publication of SE516183C2 publication Critical patent/SE516183C2/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F9/00—Methods or devices for treatment of the eyes; Devices for putting-in contact lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
    • A61F9/04—Eye-masks ; Devices to be worn on the face, not intended for looking through; Eye-pads for sunbathing
    • A61F9/06—Masks, shields or hoods for welders
    • A61F9/065—Masks, shields or hoods for welders use of particular optical filters
    • A61F9/067—Masks, shields or hoods for welders use of particular optical filters with variable transmission
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • 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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Nonlinear Science (AREA)
  • Ophthalmology & Optometry (AREA)
  • Biomedical Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Liquid Crystal (AREA)

Abstract

A liquid crystal shutter construction, suitable for glass shields or automatically darkening welding glass filters, which is switchable between a first state with high transmission of light and a second state with low transmission of light, and vice versa, in response to an electric control signal. The construction has a nematic type liquid crystal cell disposed between transparent plates having electrodes for providing an electric field in response to the control signal. The plates have mutually facing surfaces, each of which is provided with alignment means for defining a respective molecule alignment direction for molecules in the proximity of said alignment means in the absence of said electric field. The liquid crystal cell is mounted between polarisers and comprises a band pass filter. The liquid crystal cell and the band pass filter are matched so that the wavelength dependency of the transmission characteristics of the band pass filter in a certain wavelength range is substantially complementary to the wavelength dependency of the transmission characteristics of the liquid crystal cell in the absence of the electric field.
SE9503785A 1995-10-26 1995-10-26 liquid crystal SE516183C2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
SE9503785A SE516183C2 (en) 1995-10-26 1995-10-26 liquid crystal
AU73567/96A AU7356796A (en) 1995-10-26 1996-10-25 A liquid crystal shutter and a light shielding device including such a shutter
EP96935760A EP0957852A1 (en) 1995-10-26 1996-10-25 A liquid crystal shutter and a light shielding device including such a shutter
CN 96197859 CN1200661A (en) 1995-10-26 1996-10-25 Liquid crystal shutter and light shielding device including same
PCT/SE1996/001374 WO1997015256A1 (en) 1995-10-26 1996-10-25 A liquid crystal shutter and a light shielding device including such a shutter
JP9516547A JPH11514457A (en) 1995-10-26 1996-10-25 Liquid crystal shutter and light shielding device having such a shutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9503785A SE516183C2 (en) 1995-10-26 1995-10-26 liquid crystal

Publications (3)

Publication Number Publication Date
SE9503785D0 true SE9503785D0 (en) 1995-10-26
SE9503785L SE9503785L (en) 1997-04-27
SE516183C2 SE516183C2 (en) 2001-11-26

Family

ID=20399985

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9503785A SE516183C2 (en) 1995-10-26 1995-10-26 liquid crystal

Country Status (6)

Country Link
EP (1) EP0957852A1 (en)
JP (1) JPH11514457A (en)
CN (1) CN1200661A (en)
AU (1) AU7356796A (en)
SE (1) SE516183C2 (en)
WO (1) WO1997015256A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50106550D1 (en) * 2000-12-21 2005-07-21 Optrel Ag Wattwil BLADE PROTECTION DEVICE FOR WELDING PROTECTION MASKS
JP4382317B2 (en) * 2001-12-06 2009-12-09 シチズンホールディングス株式会社 Liquid crystal variable wavelength filter device
WO2004053586A1 (en) * 2002-12-11 2004-06-24 Optiva, Inc. Liquid crystal shutter
EP1821136A1 (en) * 2006-02-17 2007-08-22 Optrel Ag Glare protection device
GB2498726A (en) 2012-01-25 2013-07-31 3M Innovative Properties Co Automatic welding filter with tunable spectral transmission
US20140168546A1 (en) * 2012-12-13 2014-06-19 3M Innovative Properties Company Curved Automatic-Darkening Filter
EP3436871B1 (en) * 2016-03-28 2020-04-22 LC-TEC Displays AB Electro-optic guest-host liquid crystal variable transmission filter with wide viewing angle
EP3454803B1 (en) 2016-05-12 2023-11-15 3M Innovative Properties Company Protective headgear comprising a curved switchable shutter and comprising multiple antireflective layers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE425048B (en) * 1978-04-24 1982-08-30 Ake Hornell MULTIPLE GLASS, SEPARATE PROTECTIVE GLASS IN A WELDING SCREEN
SE464264B (en) * 1984-02-24 1991-03-25 Esab Ab OPTICAL FILTER FOR WELDING GLASS
US5208688A (en) * 1991-02-08 1993-05-04 Osd Envizion Company Eye protection device for welding helmets
SE502868C2 (en) * 1994-04-26 1996-02-05 Hoernell Elektrooptik Ab Welding quick filter with improved angular properties

Also Published As

Publication number Publication date
CN1200661A (en) 1998-12-02
WO1997015256A1 (en) 1997-05-01
SE516183C2 (en) 2001-11-26
EP0957852A1 (en) 1999-11-24
AU7356796A (en) 1997-05-15
SE9503785L (en) 1997-04-27
JPH11514457A (en) 1999-12-07

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