Patent ID: 8953091
Filing Date: 2015-02-10
Classification: G02B,G03B,H01L,H04N

Abstract:
1. An apparatus for adjusting a focal point, the apparatus comprising: an imaging device comprising a plurality of pixels each comprising an optical aperture disposed between a micro lens and a photoelectric conversion unit, each optical aperture being eccentric with respect to an optical axis of the respective micro lens, the imaging device configured to output a phase difference signal; and a control unit that detects a focal position or a focal direction from the phase difference signal detected from the plurality of pixels of the imaging device to drive a focus lens and that adjusts a focal point, wherein the plurality of pixels has at least two different mask types comprising a plurality of first pixels each having a first optical aperture including a first optical axis and a plurality of second pixels each having a second optical aperture not including a second optical axis, wherein the control unit detects the focal position from a phase difference signal according to the second pixels if the phase difference signal according to the second pixels is obtainable and controls the focus lens to be driven to the focal position, and wherein the control unit detects the focal direction by obtaining a phase difference signal according to the first pixels if the phase difference signal according to the second pixels is not obtainable, and controls the focus lens to be driven in the detected focal direction.