Patent ID: 8184197
Filing Date: 2012-05-22
Classification: G02B,G03B,H04N

Abstract:
1. A focus detecting apparatus for use in an image pick-up apparatus, comprising: a mark arranged on a primary image plane; a sensor unit on which a pair of images of the subject and a pair of images of the mark are formed; a primary defocus computing unit configured to compute a primary defocus amount according to a distance between the pair of images of the subject; a wavelength detecting unit configured to determine a main wavelength of light entering the image pick-up apparatus according to a distance between the pair of images of the mark; a correction computing unit configured to compute a chromatic aberration correction amount according to the main wavelength determined by the wavelength detecting unit; and a secondary defocus computing unit configured to add the chromatic aberration correction amount to the primary defocus amount to obtain a final defocus amount.