INFRARED FILTER USING CHOLESTERIC LIQUIDS,申请号CA19890603893-传众专利搜索

INFRARED FILTER USING CHOLESTERIC LIQUIDS

申请公布号：CA1325741(C)

申请号：CA19890603893

申请日期：1989.06.26

申请公布日期：1994.01.04

申请人：

KAISER AEROSPACE & ELECTRONICS CORPORATION

发明人：KALMANASH, MICHAEL;BERMAN, ARTHUR L.

分类号：G02B5/20;C09K19/00;F21V9/04;G02B5/28;G02B5/30;(IPC1-7):G02F1/00;G02B5/26

主分类号：G02B5/20

摘要：INFRARED FILTER USING CHOLESTERIC LIQUIDS A high precision optical filter includes a wideband filter element and a cholesteric liquid crystal notch filter element. In one embodiment, a wideband infrared filter blocks infrared wavelengths beginning at a nearly visible corner wavelength and a cholesteric liquid crystal filter blocks transmission of infrared wavelengths in a precise narrow band that includes the corner wavelength and that extends down to visible wavelengths. The liquid crystal filter may include a polymer for maintaining maximum reflectivity of the filter near the corner wavelength over an anticipated operating temperature range. The combined optical filter may be fabricated by depositing a matched pair of liquid crystal cholesteric films on a glass infrared filter element. In another embodiment, an optical filter according to the invention forms an eyepiece in a night vision goggles assembly for blocking visible light. The filter may also be mounted on a display device to block the transmission of undesirable infrared emissions at the source.