View finder optical system
AssigneeFuji Photo Film Co., Ltd.
InventorMakoto Kuboshima
Life of this patent
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Abstract
A view finder optical system suitable for use in a single or twin lens reflex camera, using an image erecting-and-reflecting optical element. This optical element functions to change the image to be photographed appearing on the focusing plate of the camera to an erect real image which stands at a proper distance from the eyepiece of the camera. This makes it possible to increase the magnification of the view finder as much as required simply by using a short focal length eyepiece.
Claims7
A view finder optical system for a reflex camera having a focusing plate on the top thereof comprising a reflecting surface lying above the focusing plate for reflecting backward and downward the light from the focusing plate, a semi-transparent plane for reflecting the light from the reflecting surface forward in parallel to the face of the focusing plate, an image erecting-and-reflecting optical means positioned ahead of the semi-transparent plane to reflect the light therefrom backward thereto for forming an erect image behind the semi-transparent plane, and an eyepiece positioned behind the semi-transparent plane for viewing the erecting image therethrough.
Dependencies are inferred from the claim text.