Electro-optic welding lens assembly

An electro-optic welding lens assembly for use in a welder's helmet or a protective eyeshield and including at least one liquid crystal filter element adapted to be controlled with regard to its light transmission as well as control means for changing the rate of light transmision of the liquid...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	FUERTHBAUER, RUPERT, STANELLI, DANIEL
Format:	Patent
Sprache:	eng
Schlagworte:	BANDAGES, DRESSINGS OR ABSORBENT PADS DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS FILTERS IMPLANTABLE INTO BLOOD VESSELS FIRST-AID KITS FOMENTATION FREQUENCY-CHANGING HUMAN NECESSITIES HYGIENE MEDICAL OR VETERINARY SCIENCE NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES PHYSICS PROSTHESES TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TREATMENT OR PROTECTION OF EYES OR EARS
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Beschreibung
Zusammenfassung:	An electro-optic welding lens assembly for use in a welder's helmet or a protective eyeshield and including at least one liquid crystal filter element adapted to be controlled with regard to its light transmission as well as control means for changing the rate of light transmision of the liquid crystal filter element. The control means comprises a first manually adjustable control circuit operating independently of the amount of light falling on the lens assembly and including means for adjusting the rate of light passing through the liquid crystal filter element. Further, there is provided a second automatically operated control circuit operating in relation to the amount of light falling on the lens assembly. The second control circuit operates only within a range of light intensity above a predetermined threshold value to limit the rate of transmission of light passing through the liquid crystal filter element. The second control circuit overrides and compensates, respectively, the effect of the first control circuit in the range above the threshold value of light intensity falling on the lens assembly with the effect that the lens assembly cannot be opened too much if harmful light rays are present in the ambient environment.