Interference filter with sharp cutoff characteristics

Details Interference filter with sharp cutoff characteristics Interference filter with sharp cutoff characteristics

1989-12-21

1991-07-30

Arnold, Bruce Y.

350166, G02B 528

Patent

active

050354850

ABSTRACT:
An interference filter for use in a copying machine comprises a glass substrate and a plurality of high-refractive index and low-refractive index layers alternately superposed on the substrate for reducing ripples at opposite sides of the reflective range. The first and second layers counted from the substrate have a greater optical layer thickness than .lambda.o/2. The third and fourth layers have a greater optical layer thickness than .lambda.o/4. The second top layer has a greater optical layer thickness than .lambda.o/2. The top layer has a smaller optical layer thickness than .lambda.o/4. The remaining layers have an optical layer thickness equal to .lambda.o/4.

REFERENCES:
patent: 4461532 (1984-07-01), Sato et al.
patent: 4714308 (1987-12-01), Sawamura et al.
patent: 4726655 (1988-02-01), Mahlein
patent: 4756602 (1988-07-01), Southwell et al.
patent: 4770496 (1988-09-01), Mahlein
patent: 4784467 (1988-11-01), Akatsuka et al.
patent: 4854670 (1989-08-01), Mellor

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