Method of forming relief surfaces

Details Method of forming relief surfaces Method of forming relief surfaces

1993-01-11

1995-01-24

Nelson, Peter A.

Communications: directive radio wave systems and devices (e.g.,

Radio wave absorber

With particular geometric configuration

342 3, H01Q 1700

Patent

active

053845714

ABSTRACT:
A ultrablack article made of a resin containing light absorbing pigments or dyes and its method of manufacture. The surface of the article is provided with light reflecting projections that cause incident light to reflect from the sides of such projections at least twice and preferably at least three times before reflecting from the articles surface. The vast majority of the incident light is thereby transmitted into the article where it is absorbed. The projections are advantageously conical, pyramidal or ridge shaped. The total incident light that reflects from the surface and from the interior of the article is not greater than 0.5%.
The surface can be made by applying cone or pyramid shaped light beams to photoresist stepwise to make cones and pyramids and by scanning to make ridges. Means are provided to transfer such surfaces to more suitable resins and to do so continuously.

REFERENCES:
patent: 4883341 (1989-11-01), Whitehead
3M/Optical Systems Right Angle Backlighting Technology Design Aid [Product Brochure-No Date].
The Infrared Handbook, Office of Naval Research, Department of the Navy, 1985, pp. 2-26 to 2-19, 2-24, 2-25.

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