a transfer element that is turned on or off by a transfer signal and that transfers {HEAD ~ the electric charge} in the photoelectric conversion element to {TAIL ~ the input node} in an on state, and 
to
a transfer element that is turned on or off by a transfer signal and that transfers { HEAD ~ the electric charge } in the photoelectric conversion element to { TAIL ~ the input node } in an on state , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH