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1. WO1992016820 - LIQUID CRYSTAL LENS DRIVER ELECTRONICS FOR EYE PROTECTION AND HIGH SPEED SHUTTERING

Publication Number WO/1992/016820
Publication Date 01.10.1992
International Application No. PCT/US1992/001320
International Filing Date 19.02.1992
IPC
A61F 9/06 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
FFILTERS 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
9Methods 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
04Eye-masks
06Masks, shields, or hoods for welders
G01J 1/02 2006.01
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
02Details
G01J 1/04 2006.01
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
02Details
04Optical or mechanical part
G01J 1/44 2006.01
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
42using electric radiation detectors
44Electric circuits
G02F 1/133 2006.01
GPHYSICS
02OPTICS
FDEVICES 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
1Devices 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
01for the control of the intensity, phase, polarisation or colour
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
CPC
A61F 9/067
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
FFILTERS 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
9Methods 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
04Eye-masks ; ; Devices to be worn on the face, not intended for looking through; Eye-pads for sunbathing
06Masks, shields or hoods for welders
065use of particular optical filters
067with variable transmission
G01J 1/04
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
02Details
04Optical or mechanical part ; supplementary adjustable parts
G01J 1/044
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
02Details
04Optical or mechanical part ; supplementary adjustable parts
0407Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
044using shutters
G01J 1/18
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
10by comparison with reference light or electric value ; provisionally void
16using electric radiation detectors
18using comparison with a reference electric value
G01J 1/44
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
42using electric radiation detectors
44Electric circuits
G01J 2001/0276
GPHYSICS
01MEASURING; TESTING
JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
1Photometry, e.g. photographic exposure meter
02Details
0276Protection
Applicants
  • OSD ENVIZION COMPANY [US]/[US]
Inventors
  • FERGASON, John, D.
  • FERGASON, Jeffrey, K.
Agents
  • SKLAR, Warren, A.
Priority Data
674,85025.03.1991US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) LIQUID CRYSTAL LENS DRIVER ELECTRONICS FOR EYE PROTECTION AND HIGH SPEED SHUTTERING
(FR) CIRCUIT ELECTRONIQUE D'EXCITATION D'UN OBJECTIF A CRISTAUX LIQUIDES POUR LA PROTECTION DES YEUX, ET SYSTEME D'OBTURATION RAPIDE
Abstract
(EN)
A power supply circuit (14) for a liquid crystal welding lens (10) or shutter develops a relatively low voltage AC signal for driving or powering the liquid crystal shutter (10) to the clear state and two relatively higher or larger magnitude AC electrical signals for initially driving the shutter (10) to the dark state and then for maintaining the shutter (10) in the dark state; a variable frequency circuit (61) for varying the frequency of the driving signal to the shutter (10) to minimize power usage in the dark state and to avoid flicker in the clear state; and power saving and battery level indicator features are included.
(FR)
Un circuit d'alimentation électrique (14) pour un objectif (10) ou un obturateur de soudage à cristaux liquides produit un signal c.a. basse tension pour exciter ou activer l'obturateur à cristaux liquides (10) pour qu'il passe à l'état clair, et deux signaux électriques c.a. plus importants ou de valeur plus élevée pour faire passer d'abord l'obturateur (10) à l'état sombre et ensuite le maintenir dans cet état. On décrit également un circuit à fréquence variable (61) permettant de varier la fréquence du signal d'excitation transmis à l'obturateur (10) afin de réduire au minimum la consommation à l'état sombre et éviter le scintillement à l'état clair. Des caractéristiques permettant d'économiser le courant et de connaître l'état de charge de la batterie sont également décrites.
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