Infrared filter using cholesteric liquids

Details Infrared filter using cholesteric liquids Infrared filter using cholesteric liquids

1988-06-24

1991-05-21

Miller, Stanley D.

350316, 350339F, 350350R, 350352, G02F 1133

Patent

active

050169858

ABSTRACT:
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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patent: 4655553 (1987-04-01), Klein
patent: 4726660 (1988-02-01), Rushford

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