Electro-optic welding lens assembly

Details Electro-optic welding lens assembly Electro-optic welding lens assembly

G - Physics

02

F

328/114.2

G02F 1/13 (2006.01) A61F 9/06 (2006.01)

Patent

CA 1207846

- 1 - Abstract An electro-optic welding lens assembly for the use in a welder's helmet or protective eyeshield comprises a filter arrangement with at least one liquid crystal light shutter element and a con- trol unit for changing the transmission rate of the filter as- sembly in response to ambient light conditions. The light sen- sing element used to control the transmission of light through the filter arrangement is simultaneously an opto-electric trans- ducer, supplying power to the control unit and the light shutter element. Thereby, there is no need for an additionalpower supply like a battery. If the sensing and transducer element is ar- ranged behind the light shutter element, a self-regulating loop can be realized to continuously vary the transmission rate of the filter arrangement and thereby to keep the viewing illumi- nation through the lens assembly essentially constant.

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