| 主权项 |
1. An imaging device comprising:
a pixel cell including a first photoelectric conversion unit, a second photoelectric conversion unit, and an output unit; and a read-out circuit including an amplification unit and a buffer unit, the amplification unit configured to amplify a signal based on a signal output from the output unit, and to output an amplified signal to the buffer unit, and the buffer unit configured to buffer a signal output from the amplification unit, a capacitor element configured to hold a signal output from the buffer unit, and a switching unit configured to switch a state, between the buffer unit and the capacitor element, between a conductive state and a non-conductive state, wherein the output unit outputs a first signal based on electric charges accumulated in the first photoelectric conversion unit, the amplification unit outputs a first amplified signal obtained by amplifying a signal based on the first signal, and the buffer unit outputs a first buffer signal obtained by buffering a signal based on the first amplified signal, the output unit outputs a second signal based on electric charges obtained by adding electric charges accumulated in the first photoelectric conversion unit and electric charges accumulated in the second photoelectric conversion unit, the amplification unit outputs a second amplified signal obtained by amplifying a signal based on the second signal, and the buffer unit outputs a second buffer signal obtained by buffering a signal based on the second amplified signal, and a period, in which the switching unit keeps a path between the buffer unit and the capacitor element in the conductive state to cause the capacitor element to hold the first buffer signal, is shorter than a period, in which the switching unit keeps the electrical path between the buffer unit and the capacitor element in the conductive state to cause the capacitor element to hold the second buffer signal. |
