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