Patent ID: 6766112
Filing Date: 2004-07-20
Classification: G02B

Abstract:
A focal point detection apparatus that guides a pair of light fluxes originating from a subject and then passing off an optical axis of a photographic optical system, to an image sensor by a focal point detection optical system, forms a pair of subject images on said image sensor and detects a focal adjustment state of said photographic optical system based upon the degree to which said pair of subject images are offset, comprising:a first deflection member that is positioned between said photographic optical system and a predicted focal image plane of said photographic optical system to deflect said pair of light fluxes from the subject passing off said optical axis of said photographic optical system toward said optical axis; and a second deflection member that deflects said pair of light fluxes from the subject which have been deflected by said first deflection member to allow them to advance substantially parallel to said optical axis, wherein said first deflection member and said second deflection member are provided at said focal point detection optical system.