Imaging element and imaging device

An imaging element comprising:

• a photoelectric conversion part configured to convert light into charges;
• an accumulation part in which the charges from the photoelectric conversion part are accumulated;
• a transfer path part which is a transfer path for transferring charges from the photoelectric conversion part to the accumulation part and has a lower potential than a pixel separation region formed around the photoelectric conversion part;
• a measurement part configured to measure the number of times a predetermined amount of charges is accumulated in the accumulation part and to measure an amount of charges accumulated in the photoelectric conversion part;
• and
• a comparator including a first input terminal connected to the accumulation part, a second input terminal to which a predetermined reference potential is applied, and an output terminal which outputs a potential based on a potential of the first input terminal and a potential of the second input terminal,
• wherein (i) a signal based on the number of times the predetermined amount of charges is accumulated in the accumulation part measured by the measurement part and (ii) a signal based on the amount of charges accumulated in the photoelectric conversion part measured by the measurement part are output within one frame period, and
• wherein the measurement part (i) changes a potential applied to the first input terminal by way of a ramp voltage applied simultaneously with the predetermined reference potential being applied to the second input terminal and (ii) measures the amount of charges accumulated in the photoelectric conversion part on the basis of a time until the potential of the output terminal changes.