Phase-type focusing screen

Details Phase-type focusing screen Phase-type focusing screen

1990-11-06

1992-06-23

Arnold, Bruce Y.

Optical: systems and elements

Projection screen

Unitary sheet comprising plural refracting areas

354200, 359599, G03B 300

Patent

active

051248395

ABSTRACT:
A focusing screen has a base plate with a planar surface. A plurality of unit regions are arrayed with a periodicity on the base plate planar surface. Each of the unit regions comprises (1) a first plurality of convex portions or concave portions having planar surfaces substantially parallel to the base plate planar surface and having a first height different from the base plate planar surface and having at least two different diameters, and (2) a second plurality of convex portions or concave portions having planar surfaces substantially parallel to the base plate planar surface and having a second height different from the base plate planar surface and having at least two different diameters.

REFERENCES:
patent: 3794829 (1974-02-01), Taljavull
patent: 4421398 (1983-12-01), Suzuki et al.
patent: 4427265 (1984-01-01), Suzuki et al.
patent: 4519686 (1985-05-01), Seki et al.
patent: 4586786 (1986-05-01), Suzuki et al.
patent: 4697878 (1987-10-01), Kimura et al.
patent: 4703405 (1987-10-01), Lewin
patent: 4946252 (1990-08-01), Sugawara
patent: 4982214 (1991-01-01), Matsui

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