Focus detection apparatus and control method thereof to control accumulation time of the focus detection sensors

摘要

A focus detection apparatus comprises a sensor unit including a first sensor and a second sensor and configured to output a signal for focus detection, each of the first sensor and the second sensor being configured to receive light that has passed through an imaging optical system and accumulate electric charges, a first signal generation unit configured to generate a first signal based on a contrast of a signal corresponding to the electric charges accumulated in the first sensor, a second signal generation unit configured to generate a second signal based on a contrast of a signal corresponding to the electric charges accumulated in the second sensor; and a control unit configured to control an accumulation time of the electric charges in the first sensor and the second sensor.

主权项

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.