Depth measurement apparatus, imaging apparatus, and method of controlling depth measurement apparatus

摘要

A depth measurement apparatus including ranging pixels each having a plurality of photoelectric conversion units for receiving light fluxes that have respectively passed through first and second pupil regions, a reading unit that is shared by the plurality of photoelectric conversion units, and a control unit for controlling the ranging operation, wherein a signal charge accumulated in one of the photoelectric conversion units is output as a first signal and a second signal obtained by adding a signal accumulated in the other photoelectric conversion unit to the first signal is output, the signal charge accumulated in the other photoelectric conversion unit is acquired based on a difference between the first and second signals, and the signal charge of the photoelectric conversion unit receiving flux with a lower transmittance is read first.

主权项

1. A depth measurement apparatus, comprising:
an imaging optical system; an image pickup device which includes pixels each having a photoelectric conversion unit for receiving a light flux that has passed through a first pupil region of the imaging optical system and a photoelectric conversion unit for receiving a light flux that has passed through a second pupil region, that is different from the first pupil region, of the imaging optical system; a reading unit that is shared by a plurality of photoelectric conversion units in the pixels; and a control unit configured to control a ranging operation, wherein the control unit is configured such that:
a signal charge accumulated in a first photoelectric conversion unit among the plurality of photoelectric conversion units is transferred to the reading unit, and a first signal corresponding to the signal charge accumulated in the first photoelectric conversion unit is output,a signal charge accumulated in a second photoelectric conversion unit among the plurality of photoelectric conversion units that is different from the first photoelectric conversion unit is transferred to the reading unit, and a second signal corresponding to a sum of the signal charges accumulated in the first and second photoelectric conversion units is output,a third signal corresponding to the signal charge accumulated in the second photoelectric conversion unit is obtained based on a difference between the second signal and the first signal,a distance to an object is measured based on an image shift amount of parallax images respectively obtained from the first signal and the third signal, andthe first photoelectric conversion unit is, out of the photoelectric conversion units of a pixel including the photoelectric conversion unit for receiving the light flux that has passed through the first pupil region and the photoelectric conversion unit for receiving the light flux that has passed through the second pupil region, the photoelectric conversion unit which receives light flux with a relatively lower transmittance in a travel path from an object to the pixel.