Diffusion filter and method of making same

Details Diffusion filter and method of making same Diffusion filter and method of making same

1979-10-18

1982-05-11

Corbin, John K.

G02B 502, G02B 1320

Patent

active

043290230

ABSTRACT:
A diffusion filter can be formed by sandblasting a transparent plate to produce a pitted surface. A neutral density cement having an index of refraction different from that of the plate is applied to the pitted surface and a second plate is then bonded to the first by the cement. The opposing surface of the second plate may also be pitted to achieve increased diffusion. Light that strikes the filter and passes directly through without entering the pits forms a sharp image, while light that enters the pits is refracted so that it forms a soft image superimposed on the sharp image. Some light that enters the pits and is scattered within the cement is absorbed.

REFERENCES:
patent: 2240706 (1941-05-01), Law
patent: 2275602 (1942-03-01), Beck et al.
patent: 2312206 (1943-02-01), Calbick
patent: 3442569 (1969-05-01), Bonnet
patent: 3833288 (1974-09-01), Nilsson

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