1985-05-02
1987-04-21
Arnold, Bruce Y.
350316, G02B 528, G02B 522
Patent
active
046591788
ABSTRACT:
An optical filter comprising a colored glass plate having band-pass filter characteristics and an interference multilayer film formed over the glass plate. The colored glass plate defines a transmission band of relatively narrow width in the visible range. The interference multilayer film comprises at least two unit layers and a low refractive index material layer interposed therebetween and having an optical thickness of .lambda..sub.o /4. The unit layer is composed of two high refractive index material layers having an optical thickness of .lambda..sub.o /4 and a low refractive index material layer interposed therebetween and having an optical thickness of .lambda..sub.o /2. The interference multilayer film is designed to define a reflection band for removing a predetermined range of wavelengths from the transmission band of the color glass plate.
REFERENCES:
patent: 2871371 (1959-01-01), Gray
patent: 3504959 (1970-04-01), Hennessey
Arnold Bruce Y.
Minolta Camera Kabushiki Kaisha
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