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1. (WO1997015254) LIQUID CRYSTAL SHUTTER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1997/015254 International Application No.: PCT/SE1996/001372
Publication Date: 01.05.1997 International Filing Date: 25.10.1996
IPC:
A61F 9/06 (2006.01) ,G02F 1/133 (2006.01) ,G02F 1/1347 (2006.01)
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
F
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
9
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
04
Eye-masks
06
Masks, shields, or hoods for welders
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
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
01
for the control of the intensity, phase, polarisation or colour
13
based on liquid crystals, e.g. single liquid crystal display cells
133
Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
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
01
for the control of the intensity, phase, polarisation or colour
13
based on liquid crystals, e.g. single liquid crystal display cells
133
Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333
Constructional arrangements
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
Applicants:
HÖRNELL INTERNATIONAL AB [SE/SE]; c/o Hörnell Innovation AB Tunavägen 281 S-781 73 Borlänge, SE (AllExceptUS)
PALMER, Stephen [GB/SE]; SE (UsOnly)
HÖRNELL, Åke [SE/SE]; SE (UsOnly)
Inventors:
PALMER, Stephen; SE
HÖRNELL, Åke; SE
Agent:
KITZLER, Michael ; H. Albihns Patentbyrå AB P.O. Box 3137 S-103 62 Stockholm, SE
Priority Data:
9503783-426.10.1995SE
Title (EN) LIQUID CRYSTAL SHUTTER
(FR) OBTURATEUR A CRISTAUX LIQUIDES
Abstract:
(EN) A liquid crystal shutter construction (18), suitable for a glass shield and a welding glass filter, which shutter construction is able to switch between a high light absorbing dark state and a low light absorbing transparent state, and vice versa, comprising low twisted nematic type liquid crystal cells with a twisting angle between 0° and just below 90°, and an electronic circuit output generating a variable cell driving voltage higher than about twice the threshold voltage for at least one of the liquid crystal cells and with a polarity switching frequency of less than 1 Hertz.
(FR) La présente invention concerne un modèle d'obturateur à cristaux liquides (18), qui convient pour l'emploi comme écran protecteur en verre et comme verre filtrant pour le soudage. Il est capable de passer d'un état sombre, à forte absorption de lumière, à l'état transparent à faible absorption et inversement. Il comprend des cellules de cristaux liquides nématiques faiblement torsadées, l'angle de torsion étant compris entre 0° et juste au-dessous de 90°, et un circuit électronique donnant à la sortie une tension variable de commande des cellules qui est supérieure à environ le double de la tension de seuil pour au moins l'une des cellules à cristaux liquides, et avec une fréquence de commutation de la polarité inférieure à 1 hertz.
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, HU, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, TJ, TM, TR, TT, UA, UG, US, UZ, VN
African Regional Intellectual Property Organization (ARIPO) (KE, LS, MW, SD, SZ, UG)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
ES2199300EP0805661RU02204973US6097451JP3922467 JPH10511885
CN1169106DE000069628544AU1996073565