Patent ID: 9069234
Filing Date: 2015-06-30
Classification: G02B,G03B

Abstract:
1. A finder optical system comprising: a focusing glass including a collection surface configured to collect a light beam obtained via an image pickup optical system and a diffusion surface configured to diffuse the light beam collected by the collection surface; an eyepiece configured to receive apart of the light beam diffused by the diffusion surface; a photometry lens arranged near the eyepiece; and a photometry sensor on which an image of another part of the light beam diffused by the diffusion surface is formed via the photometry lens, wherein a plurality of micro lenses are arranged on the diffusion surface of the focusing glass, wherein at least one micro lens of the plurality of micro lenses has at least two radii of curvature on its cross section in a predetermined direction, and wherein the at least one micro lens satisfies R