Leakage-corrected linear variable filter

Details Leakage-corrected linear variable filter Leakage-corrected linear variable filter

1990-07-06

1993-06-08

Arnold, Bruce Y.

Optical: systems and elements

Light interference

Produced by coating or lamina

359580, 359613, 359614, 359885, G02B 520, G02B 528

Patent

active

052184730

ABSTRACT:
A leak-corrected linearly variable filter comprises optical filter coatings formed on an assembly of one or more optically transmissive substrates. Leaks due to the longitudinal precession of incident light within the substrates are suppressed by forming the filter such that no two surfaces which are reflected at the same wavelength within the range of interest are parallel. Typically, the constituent substrates of the filter are oriented at a slight angle relative to one another and filter coatings having overlapping reflective wavelengths are deposited on different substrates rather than on the two parallel sides of the same substrate. Alternatively, venetian shade structures can be incorporated within the substrates to block longitudinal precession of light.

REFERENCES:
patent: 2708389 (1955-05-01), Kavanagh
patent: 3442572 (1969-05-01), Illsley et al.
patent: 3539824 (1970-09-01), Illsley et al.
patent: 4070100 (1978-01-01), Akiyoshi
patent: 4342821 (1982-08-01), Galves et al.
patent: 4633078 (1986-12-01), Ferber
patent: 4772096 (1988-09-01), Kai et al.
Patent Abstracts of Japan, vol. 7, No. 125 (P-200)(1270), May, 1983, citing JP-A-58042002.
Patent Abstracts of Japan, vol. 10, No. 74 (P-439)(2131), Mar., 1986, citing JP-A-60213830.

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