1980-10-31
1982-07-06
Griffin, Donald A.
350286, G02B 504, G03B 1328
Patent
active
043380123
ABSTRACT:
This specification discloses a focusing screen adapted for use with the range finder of a camera, particularly a split image type focusing screen. This screen comprises a pair of portions desposed in the center of the real image plane of the camera, and each portion has a refracting means and a diffracting means. Thereby, in a defocused condition, the images viewed through the portions are split each other and blurred. Further, this screen can be used wth an objective lens having a small aperture ratio.
REFERENCES:
patent: 2881686 (1959-04-01), Ruhle
patent: 4003637 (1977-01-01), Masuoka
Matsumoto Kazuya
Matsumura Susumu
Momiyama Kikuo
Suzuki Takashi
Canon Kabushiki Kaisha
Griffin Donald A.
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