According to the present embodiment, because no element isolation regions by the LOCOS is arranged between the well electrode 101 and {HEAD ~ the light receiving unit} of {TAIL ~ the photodiode} 102, it becomes unnecessary to form any offset region for suppressing the dark current 
According to the present embodiment , because no element isolation regions by the LOCOS is arranged between the well electrode 101 and { HEAD ~ the light receiving unit } of { TAIL ~ the photodiode } 102 , it becomes unnecessary to form any offset region for suppressing the dark current
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH