초록 ▼

To perform accurate focus detection using a wide range of injected luminous flux from a photographic lens, a deflecting plate, which deflects the injected luminous flux of the photographic optical system in the vertical direction with respect to the direction of a pair of entrance pupils of a focus

To perform accurate focus detection using a wide range of injected luminous flux from a photographic lens, a deflecting plate, which deflects the injected luminous flux of the photographic optical system in the vertical direction with respect to the direction of a pair of entrance pupils of a focus detecting optical system, is provided at, or near, a predetermined image forming plane of the photographic optical system. By this structure, the entrance pupils of the focus detecting optical system can be spread in a direction vertical to the focus detecting direction, and the focus detecting accuracy can be improved by using a wider range of the injected luminous flux of the focus detecting optical system.

대표청구항 ▼

[ What is claimed is:] [1.] In a focus detector that detects a focus condition by detecting a shift of a pair of images of a photographic object that are formed by passing light formed at an image forming plane by a photographic optical system from the image forming plane through at least one pair o

[ What is claimed is:] [1.] In a focus detector that detects a focus condition by detecting a shift of a pair of images of a photographic object that are formed by passing light formed at an image forming plane by a photographic optical system from the image forming plane through at least one pair of entrance pupils of a focus detecting optical system and onto a pair of detectors, the focus detector further comprising:a light deflector located near the image forming plane to deflect the light in a direction orthogonal to an alignment direction of the at least one pair of entrance pupils.