Solid-state image sensor, imaging device, and method of controlling solid-state image sensor

An imaging device comprising:

• a photoelectric conversion element configured to generate a charge by photoelectric conversion;
• a charge accumulation unit configured to accumulate the charge and generate a voltage according to an amount of the charge;
• a transfer transistor configured to transfer the charge from the photoelectric conversion element to the charge accumulation unit;
• a detection unit configured to detect whether or not a change amount of a photocurrent according to the amount of the charge exceeds a predetermined threshold;
• a connection transistor configured to connect the charge accumulation unit and the detection unit and allow the photocurrent to flow;
• and
• a digital signal processing unit configured to process a digital signal obtained by performing analog-digital conversion for an analog signal according to the voltage.

A method of controlling a solid-state image sensor, the method comprising:

• a transfer procedure of transferring, from a photoelectric conversion element that generates a charge by photoelectric conversion, the charge to a charge accumulation unit that accumulates the charge and generates a voltage according to an amount of the charge;
• a detection procedure of detecting whether or not a change amount of a photocurrent according to the amount of the charge exceeds a predetermined threshold;
• and
• a connection procedure of connecting the charge accumulation unit and the detection unit and allowing the photocurrent to flow.