Optical filter arrangement

Details Optical filter arrangement Optical filter arrangement

1995-04-06

1998-03-24

Dzierzynski, Paul M.

Optical: systems and elements

Light interference

Produced by coating or lamina

359589, 359585, 359891, G02B 110, G02B 528, G02B 522

Patent

active

057318980

ABSTRACT:
An optical filter arrangement comprises at least two optical filter elements including a transparent substrate and an optical coating typically comprising at least two overlying optical thin films. The coating defines a first patterned area and a second surround area bordering the first area. The first area has substantially the same optical transmittance characteristics as the second area and different optical reflectance characteristics over at least a portion of the visible spectrum. The distinction between the first area and the second area is visually perceptible when viewed from one side of the optical filter arrangement and is substantially visually imperceptible when viewed from the opposite side of the optical filter arrangement. As a result, a coloured pattern or logo is only visible when viewed from one side of the filter arrangement. The invention extends to a method of forming such an arrangement.

REFERENCES:
patent: 2519545 (1950-08-01), Colbert et al.
patent: 3612692 (1971-10-01), Kruppa et al.
patent: 4313648 (1982-02-01), Yano et al.
patent: 4619504 (1986-10-01), Daniels et al.
patent: 5149351 (1992-09-01), Yaba et al.
patent: 5164858 (1992-11-01), Aguilera et al.
patent: 5337191 (1994-08-01), Austin
Patent Abstracts of Japan, vol. 18, No. 197, (P-1723) (6537) 100 P 1723, dated Apr. 6, 1994.

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