Focusing screen

Details Focusing screen Focusing screen

1982-11-15

1988-09-13

Griffin, Donald A.

G03B 300

Patent

active

047713046

ABSTRACT:
A focusing screen provided with a plurality of cylindrical lenses adjacent to one another is disclosed. The adjacent two of the cylindrical lenses have individual characteristics to shift between respective areas an image of an object in opposite directions when the object is out of focus. For this reason, when in an out-of-focus condition, the amount of the slided image along a boundary line between the areas is doubled, thus permitting the operator to perform a focusing operation with high accuracy.

REFERENCES:
patent: 2569516 (1951-10-01), Corsi et al.
patent: 2881686 (1959-04-01), Ruhle
patent: 4003637 (1977-01-01), Masuoka

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