Phase-type focusing screen and process for manufacturing the sam

Details Phase-type focusing screen and process for manufacturing the sam Phase-type focusing screen and process for manufacturing the sam

1990-02-21

1993-02-23

Gellner, Michael L.

Optical: systems and elements

Prism

With reflecting surface

359443, 359454, G03B 300, G03B 2160

Patent

active

051894548

ABSTRACT:
A phase-type focusing screen includes is made by using two photo masks each having a plurality of unit pattern regions regularly arrayed, each of which has a plurality of minute patterns of a predetermined shape and different size irregularly arrayed in such a way that three or more plane portions of different height are formed in the surface of a substrate, wherein the light beams passing through the combined minute patterns are given phase differences as they are diffracted or scattered. Thus, a desired diffusing characteristic is imparted into the focusing screen.

REFERENCES:
patent: 4338012 (1982-07-01), Matsumura et al.
patent: 4982214 (1991-01-01), Matsui

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