发明名称 |
INFRARED FILTER USING CHOLESTERIC LIQUIDS |
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.
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申请公布号 |
CA1325741(C) |
申请公布日期 |
1994.01.04 |
申请号 |
CA19890603893 |
申请日期 |
1989.06.26 |
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 |
代理机构 |
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代理人 |
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主权项 |
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