Focusing screen

Details Focusing screen Focusing screen

1991-06-11

1992-11-03

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

From grating

359569, 354200, G03B 1324, G02B 518

Patent

active

051610582

ABSTRACT:
A phase type focusing screen has a plurality of minute patterns of a given shape formed by protrudent and/or recessed parts and allocated on a surface of an optically transparent base plate. Assuming that a stepped level difference between a top face of the protrudent part or a bottom face of the recessed part and the surface of the base plate is d, a refractive index of a material of the base plate is n and the shortest wave length within a working wave length region is .lambda., the following condition is satisfied:

REFERENCES:
patent: 4336989 (1982-06-01), Matsumura et al.
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: 4598977 (1986-07-01), Kobayashi
patent: 4697878 (1987-10-01), Kimura
patent: 4982214 (1991-01-01), Matsui

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