公开(公告)号：WO1992016820A1

公开(公告)日：1992-10-01

申请号：PCT/US1992001320

申请日：1992-02-19

Applicant: OSD ENVIZION COMPANY

Inventor： OSD ENVIZION COMPANY ,  FERGASON, John, D. ,  FERGASON, Jeffrey, K.

IPC: G01J01/32

CPC classification number: G01J1/18 ,  A61F9/067 ,  G01J1/04 ,  G01J1/044 ,  G01J1/44 ,  G01J2001/0276 ,  G02F1/13306 ,  G02F1/13318

Abstract: 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.

公开(公告)号：WO1993013449A1

公开(公告)日：1993-07-08

申请号：PCT/US1992010998

申请日：1992-12-22

Applicant: OSD ENVIZION COMPANY

Inventor： OSD ENVIZION COMPANY ,  FERGASON, Jeffrey, K. ,  BERMAN, Arthur, L. ,  FERGASON, James, L. ,  FERGASON, John, D.

IPC: G02F01/133

CPC classification number: A61F9/062 ,  G02B27/28 ,  G02F1/13471 ,  G02F2001/133531

Abstract: A welding helmet (60) includes a shield (62) and a lens (68) including a first polarizer (14') and a first analyzer (16') in optical series having transmissive axes oriented substantially operationally orthogonal to one another; and, a second polarizer (14'') and a second analyzer (16'') in optical series having transmissive axes oriented substantially operationally orthogonal to one another; the second polarizer (14'') and the first analyzer (16') being in optical series and having their transmissive axes oriented substantially at 45 degrees to one another to improve extinction of light incident on said lens (68) at all angles.

Abstract translation: 焊接头盔（60）包括屏蔽（62）和透镜（68），透镜（68）包括第一偏振器（14'）和第一分析器（16'），光学系列具有基本上在操作上彼此正交的方向定向的透射轴; 以及光学系列的第二偏振器（14“）和第二分析器（16”），其具有基本上在操作上彼此正交的方向定向的透射轴; 第二偏振器（14“）和第一分析器（16'）是光学系列的并且其透射轴线基本上彼此成45度取向，以改善入射在所述透镜（68）上的光的各种角度的消光。