Solid imaging device and x-ray ct device including the solid imaging device

A solid-state imaging device, comprising:

• a photodetecting section having M (an integer not less than 2)×N (an integer not less than 2) pixel portions P1,1 to PM,N two-dimensionally arrayed so as to form a matrix of M rows and N columns, each of the pixel portions P1,1 to PM,N including a photodiode that generates charge of an amount according to an incident light intensity, and a reading-out switch connected to the photodiode;
• a plurality of reading-out wirings LO,1 to LO,N, a reading-out wiring LO,n of the plurality of reading-out wirings being connected to the reading-out switch included in each of the M pixel portions P1,n to PM,n belonging to an n-th (an integer not less than 1 and not more than N) column in the photodetecting section, the reading-out wiring LO,n reading out a charge generated in the photodiode included in any one of the M pixel portions P1,n to PM,n via the associated reading-out switch;
• a signal reading-out section being connected to each of the plurality of reading-out wirings LO,1 to LO,N, the signal reading-out section once holding voltage values according to an amount of charge inputted through the reading-out wiring LO,n and then sequentially outputting the held voltage values;
• a plurality of row selecting wrings LV,1 to LV,M a row selecting wiring LV,m of the plurality of row selecting wirings being connected to the reading-out switch included in each of the N pixel portions Pm,1 to Pm,N belonging to an m-th row in the photodetecting section, the row selecting wiring LV,m transmitting a signal to control an opening and closing operation for reading-out switch to the reading-out switch included in each of the N pixel portions Pm,1 to Pm,N belonging to an m-th row in the photodetecting section;
• a row selecting section having a plurality of first buffers which are respectively connected to one ends of the plurality of row selecting wirings LV,1 to LV,M, the row selecting section outputting a row selecting controlling signal to control an opening and closing operation of the reading-out switch included in each pixel portion Pm,n of the photodetecting section to the row selecting wiring LV,m, sequentially row by row, to close the reading-out switch in each pixel portion Pm,n connected by the row selecting wiring, and thereby outputting a charge generated in the photodiode included in each pixel portion Pm,n to the reading-out wiring LO,n;
• and
• an overflow preventing section having a plurality of second buffers each of which corresponds to the associated one of the plurality of first buffers and which are respectively connected to the other ends of the plurality of row selecting wirings LV,1 to LV,M, the overflow preventing section outputting an overflow preventing signal to control an opening and closing operation of the reading-out switch included in each pixel portion Pm,n of the photodetecting section to the row selecting wiring LV,m to close the reading-out switch in each pixel portion Pm,n connected by the row selecting wiring, and thereby preventing a charge generated in the photodiode included in each pixel portion Pm,n from overflowing outside the pixel portion,
• wherein the plurality of first buffers are located on opposite side of the plurality of second buffers so that the plurality of first buffers sandwich the photodetecting section together with the plurality of second buffers.