Finder optical system

Details Finder optical system Finder optical system

1989-06-13

1990-12-18

Bovernick, Rodney B.

354224, 350622, G02B 504, G03B 940

Patent

active

049781995

ABSTRACT:
A finder optical system comprises a first reflecting surface disposed at an image side of an objective lens to reflect light flux passing through the objective lens obliquely upward on the exit pupil side, a roof surface consisting of two reflecting surfaces orthogonally intersecting each other which is disposed obliquely upward on the exit pupil side of the first reflecting surface to perform right-left inversion of the light flux reflected by the first reflecting surface and to reflect the light flux obliquely downward on the exit pupil side, and a second reflecting surface disposed obliquely downward on the exit pupil side of the roof surface to perform an up-down inversion of the light flux reflected obliquely downward on the exit pupil side by the roof surface and reflect the light flux toward an eyepiece, and wherein the finder optical system fulfills the following condition: 20.degree.<.theta.<40.degree. wherein, .theta. represents an angle made by the first reflecting surface and an optical axis of the objective lens. Thereby, an optical path length in an erecting system can be shortened, and the finder optical system itself becomes long in the direction of the objective lens, and therefore a finder image without eclipse can be obtained at high magnification.

REFERENCES:
patent: 2161623 (1939-06-01), Hensoldt
patent: 4309078 (1982-01-01), Hara et al.
Applied Optics, Oct. 1971, vol. 10, No. 10, pp. 2231-2234, High Precision 10-cm Apertive Penta and Roof-Penta Mirror Assemblies, by P. R. Yoder, Jr.

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