Focusing screen of a camera

Details Focusing screen of a camera Focusing screen of a camera

1983-05-19

1985-05-28

Mathews, A. A.

350127, G03B 1324

Patent

active

045196869

ABSTRACT:
A focusing screen capable of transmitting light therethrough and disposed between an objective lens and an eye-piece includes a surface formed with a large number of substantially hemispherical faces of irregular sizes disposed irregularly. The radius of curvature of the hemispherical faces is within the range of 8.5 to 52.8 .mu.m and the height thereof is within the range of 1.5 to 3.6 .mu.m.

REFERENCES:
patent: 2589014 (1952-03-01), McLeod
patent: 3149547 (1964-09-01), Jurenz
patent: 3346674 (1967-10-01), Kidder
patent: 4071292 (1978-01-01), Ise et al.

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