Optical filters for suppressing unwanted reflections

Details Optical filters for suppressing unwanted reflections Optical filters for suppressing unwanted reflections

1993-06-07

1996-05-28

Dzierzynski, Paul M.

Optical: systems and elements

Light interference

Produced by coating or lamina

359590, 359885, 359890, 359601, 359614, 348834, G02B 110, G02B 2700

Patent

active

055217591

ABSTRACT:
An optical filter is provided for suppressing unwanted reflections of background light when used with a display device such as a cathode ray tube or an electroluminescent screen, or in optical communication or surveillance. The filter has multiple thin layers including a first series of layers for suppressing reflections from its outer surface and a second series of layers constituting a bandpass interference filter. The first series of layers is arranged to suppress reflections over a broad wavelength band while the second series of layers allows transmittance over a relatively narrow wavelength passband within the broad wavelength band, resulting in improved contrast when the display is used in situations of high background light.

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