| 摘要 |
PCT No. PCT/SE94/00427 Sec. 371 Date Dec. 13, 1995 Sec. 102(e) Date Dec. 13, 1995 PCT Filed May 9, 1997 PCT Pub. No. WO94/27180 PCT Pub. Date Nov. 24, 1994The invention relates to a protective device of the type having a body (1) and a filtering unit (10) supported by said body and acting as a visor, said filtering unit being electrically shiftable between at least two light transmitting conditions and comprising, for this purpose, one or more LC cells. The filtering unit (10) is made wholly or at least to a major extent of polymer material and is designed as a panoramic visor which is darkenable over its entire area. Said one or more LC cells are in the form of a foil and extend over the entire area of the panoramic visor. The invention is of special interest for welding helmets with automatically controlled darkening. |
