Apparel – Guard or protector – For wearer's head
Reexamination Certificate
2005-09-13
2005-09-13
Lindsey, Rodney M. (Department: 3765)
Apparel
Guard or protector
For wearer's head
C250S201100, C349S014000
Reexamination Certificate
active
06941577
ABSTRACT:
A glare protection device for a welding protective mask includes an active electro-optical protective filter (2) and an electronic circuit (10). An UV-detector (UVD), which serves as an optical sensor, detects the welding light and, via an evaluation circuit (10.1), generates a signal (sin) for controlling of the protective filter (2). The signal corresponds to the detected UV intensity. The UV-detector includes a fluorescent layer (F) with an absorption in the UV range and an emission in the long-wave range corresponding to the spectral sensitivity of an assigned Si-photo detector (SD). This results in a simple and safe controlling of the protective filter, which is uninfluenced by the effects of extraneous light.
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Lindsey Rodney M.
Optrel AG
Rankin, Hill Porter & Clark LLP
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