Optical filters for suppressing unwanted reflections

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

G - Physics

02

B

G02B 5/22 (2006.01) G02B 1/11 (2006.01) G02B 5/28 (2006.01) H01J 29/89 (2006.01)

Patent

CA 2124922

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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