Patent ID: 7280751
Filing Date: 2007-10-09
Classification: G03B

Abstract:
1. An in-finder display device comprising: an optical member including prisms and disposed about a position where an objective unit forms an image, each prism having two prism facets defining a ridgeline nonparallel to a plane orthogonal to an optical axis of the objective unit; an image-inverting unit receiving light from the optical member; an eyepiece unit guiding the light from the image-inverting unit to an observer; a light source; and an illuminating unit guiding light from the light source to the prisms, wherein the light from the light source reflects off the prisms, passes through the image-inverting unit, and is guided by the eyepiece unit to the observer, wherein the image-inverting unit includes a pentagonal roof prism having a roof surface, an exit surface, and an optical surface allowing the light from the illuminating unit to pass through, the optical surface being located between the roof surface and the exit surface, and wherein the optical surface and the exit surface define an angle (θ) satisfying 110 degrees <θ<165 degrees.