Focus detection apparatus and method

摘要

A focus detection apparatus comprises: a sensor unit, having a plurality of photoelectric conversion elements for receiving light that passed through an imaging optical system and accumulating charge, configured to generate an image signal to be used for correlation calculation for focus detection based on the accumulated charge; a control unit configured to control the photoelectric conversion elements to stop charge accumulation in a case where a first signal that represents contrast of the image signal reaches a predetermined voltage level; and a voltage level setting unit. The voltage level setting unit sets a larger voltage level in a first case, in which luminance change in a direction of the correlation calculation in the plurality of the photoelectric conversion elements is gentler than a second case, than in the second case.

主权项

1. A focus detection apparatus comprising:
a sensor unit, having a plurality of photoelectric conversion elements for receiving light that passed through an imaging optical system and accumulating charge, configured to generate an image signal to be used for correlation calculation for focus detection based on the accumulated charge; a control unit configured to control the photoelectric conversion elements to stop charge accumulation in a case where a first signal that represents contrast of the image signal reaches a predetermined voltage level; and a voltage level setting unit configured to set the predetermined voltage level, wherein the voltage level setting unit sets a larger voltage level as the predetermined voltage level in a first case, in which luminance change in a direction of the correlation calculation in the plurality of the photoelectric conversion elements is gentler than a second case, than in the second case.