Invention Grant
- Patent Title: Automatic darkening filter with offset polarizers
- Patent Title (中): 带偏光偏光镜的自动变暗滤光片
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Application No.: US12328290Application Date: 2008-12-04
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Publication No.: US07884888B2Publication Date: 2011-02-08
- Inventor: Kristina M. Magnusson , Kenneth Jarefors , Per-Olav Dahlin
- Applicant: Kristina M. Magnusson , Kenneth Jarefors , Per-Olav Dahlin
- Applicant Address: US MN St. Paul
- Assignee: 3M Innovative Properties Company
- Current Assignee: 3M Innovative Properties Company
- Current Assignee Address: US MN St. Paul
- Agent Emily M. Van Vliet
- Main IPC: G02F1/1347
- IPC: G02F1/1347 ; G02F1/1335

Abstract:
A protective automatic darkening filter construction 10 includes two low twist liquid crystal cells 26, 30 interspersed between a series of offset polarizers 24, 28, 32. The resulting construction provides improved homogeneity in the dark state as viewed by the user over a large viewing angle. By reducing variations in shade, visibility through the filter may be improved.
Public/Granted literature
- US20090079886A1 AUTOMATIC DARKENING FILTER WITH OFFSET POLARIZERS Public/Granted day:2009-03-26
Information query
IPC分类: