Patent ID: 9407810
Filing Date: 2016-08-02
CPC Classification: G02B,G03B,H04N

Claim Text:
1. A focus detection apparatus comprising: a sensor unit including a first sensor and a second sensor and configured to output a signal for focus detection using a phase difference detection method, each of said first sensor and said second sensor being configured to receive light that has passed through an imaging optical system and accumulate electric charges, wherein a defocus amount is determined based on a first signal corresponding to the electric charges accumulated in said first sensor and a second signal corresponding to the electric charges accumulated in said second sensor; a signal generation unit configured to generate a predetermined signal based on a contrast of a signal input from the sensor unit; and a control unit configured to control an accumulation operation of the electric charges in said first sensor and said second sensor based on a signal level of the predetermined signal, wherein the control unit is configured to control the accumulation operation of the electric charges in said first sensor and said second sensor, based on a signal level of the predetermined signal generated based on a contrast of the first signal and a signal level of the predetermined signal generated based on a contrast of the second signal, wherein when the signal level of the predetermined signal generated based on the first signal has reached a predetermined level and the signal level of the predetermined signal generated based on the second signal has reached a predetermined level, the control unit controls to terminate accumulation of the electric charges in the first sensor and the second sensor.