Patent ID: 6262852
Filing Date: 2001-07-17
Classification: G02B

Abstract:
A real image mode finder comprising:an objective optical system with a positive refracting power;an image erecting optical system with a roof reflecting section, a first reflecting section, and a second reflecting section; andan eyepiece optical system with a positive refracting power,said image erecting optical system being constructed so that an optical axis is prevented from crossing in said image erecting optical system and a ray of light from said objective optical system is introduced into said roof reflecting section, said first reflecting section, and said second reflecting section in this order, andsaid real image mode finder satisfying the following conditions:49.degree.<.gamma.<62.5.degree.20.degree.<.alpha.<30.degree.where .gamma. is an angle of incidence of an axial ray of light on said second reflecting section and .alpha. is an angle of incidence of the axial ray of light on a roof ridgeline of said roof reflecting section.