초록 ▼

A finder for single-lens reflex type digital cameras includes a reflecting plane for splitting a light beam from an imaging optical system of a camera into two beams directed toward an image sensor and a finder system, a prism system for erecting an image, and an ocular optical system. The prism sys

A finder for single-lens reflex type digital cameras includes a reflecting plane for splitting a light beam from an imaging optical system of a camera into two beams directed toward an image sensor and a finder system, a prism system for erecting an image, and an ocular optical system. The prism system has an entrance surface, a reflecting surface consisting of one plane, a reflecting surface of roof shape, and an exit surface. An optical path between the entrance surface and the reflecting surface consisting of one plane is practically perpendicular to an optical path between the reflecting surface of roof shape and the exit surface in the prism block.

대표청구항 ▼

[ What is claimed is:] [1.] A finder for single-lens reflex type digital cameras, comprising: a reflecting plane constructed and arranged to split a light beam from an imaging optical system of a camera into two beams directed toward an image sensor and a finder system;an image-erecting prism system

[ What is claimed is:] [1.] A finder for single-lens reflex type digital cameras, comprising: a reflecting plane constructed and arranged to split a light beam from an imaging optical system of a camera into two beams directed toward an image sensor and a finder system;an image-erecting prism system; andan ocular optical system,wherein said image-erecting prism system and said ocular optical system are arranged along a traveling direction of light in said finder system placed after a position of the image formed by said imaging optical system,wherein said prism system comprises, in order along the traveling direction of the light in one prism block, an entrance surface, a first reflecting surface consisting of one plane face, a second reflecting surface of roof shape, and an exit surface,wherein said first reflecting surface folds an optical path toward an opposite side of said ocular optical system in reference to said exit surface, andwherein the optical path between said entrance surface and said first reflecting surface intersects, inside the prism block, an optical path between said second reflecting surface and said exit surface.