Patent Number: 
Section: claims

1. An X-ray flat panel detector comprising: an effective pixel array in which a plurality of pixel electrodes are arrayed in a matrix and accumulate charges;  a photoconductor which covers said effective pixel array and generates charges on the basis of incident X-rays;  a bias electrode which is formed on a second surface of said photoconductor, covers an area of said pixel electrodes, and applies a bias voltage between said photoconductor and said pixel electrodes;  a plurality of signal lines to read out electronic signals from said effective pixel array;  a plurality of scanning lines to scan said effective pixel array;  first dummy pixels which are arranged adjacent to said effective pixel array and remove noise superposed on said plurality of signal lines;  second dummy pixels which are arranged adjacent to said effective pixel array and remove noise superposed on said plurality of scanning lines;  a first protective electrode which is arranged in correspondence with said first dummy pixels and electrically shields said bias electrode and said plurality of signal lines or said plurality of scanning lines; and  a second protective electrode which is arranged in correspondence with said second dummy pixels, disconnected from said first protective electrode and electrically shields said bias electrode and said plurality of signal lines or said plurality of scanning lines. 2. The detector according to  claim 1 , further comprising a first pad to supply GND potential to said first protective electrode, and a second pad to supply GND potential to said second protective electrode. claim 1 3. The detector according to  claim 1 , wherein said first protective electrode receives GND potential of a driving circuit which drives said effective pixel array; and claim 1 said second protective electrode receives GND potential of a read circuit which reads out an electrical signal from said effective pixel array via said signal line. 4. An X-ray flat panel detector comprising: an effective pixel array in which a plurality of pixel electrodes are arrayed in a matrix and accumulate charges;  a photoconductor which covers said effective pixel array and generates charges on the basis of incident X-rays;  a bias electrode which is formed on a second surface of said photoconductor, covers an area of said pixel electrodes, and applies a bias voltage between said photoconductor and said pixel electrodes;  a plurality of signal lines to read out electronic signals from said effective pixel array;  a plurality of scanning lines to scan said effective pixel array;  a protective electrode which electrically shields said bias electrode and said plurality of signal lines or said plurality of scanning lines;  first dummy pixels which are arranged around said protective electrode and remove noise superposed on said plurality of signal lines; and  second dummy pixels which are arranged around said protective electrode and remove noise superposed on said plurality of scanning lines. 5. The detector according to  claim 4 , wherein said protective electrode is disconnected at at least one portion. claim 4 6. The detector according to  claim 4 , wherein said protective electrode includes at least two protective electrodes. claim 4 7. The detector according to  claim 4 , wherein said protective electrode has first and second protective electrode portions which are arranged axially symmetrically about said signal line or said scanning line. claim 4 8. The detector according to  claim 4 , further comprising a pad to supply GND potential to said protective electrode. claim 4 9. The detector according to  claim 4 , wherein said protective electrode receives GND potential of a driving circuit which drives said effective pixel array. claim 4 10. The detector according to  claim 4 , wherein said protective electrode receives GND potential of a read circuit which reads out an electrical signal from said effective pixel array via said signal line. claim 4 11. An X-ray flat panel detector comprising: an effective pixel array in which a plurality of pixel electrodes are arrayed in a matrix and accumulate charges;  a photoconductor which covers said effective pixel array and generates charges on the basis of incident X-rays;  a plurality of first signal lines to read out electronic signals from said effective pixel array;  a plurality of first scanning lines to scan said effective pixel array; and  an electrostatic dispersion wiring line which is connected directly or via a nonlinear element to at least one of said plurality of first signal lines and at least one of said plurality of first scanning lines, and distributes static electricity accumulated in at least one of said plurality of first signal lines or said plurality of first scanning lines,  wherein said electrostatic dispersion wiring line has a first auxiliary wiring line to disconnect said electrostatic dispersion wiring line between a connecting portion between said electrostatic dispersion wiring line and at least one of said plurality of first signal lines and a connecting portion between said electrostatic dispersion wiring line and at least one of said first scanning lines. 12. The detector according to  claim 11 , which further comprises first dummy pixels which remove noise superposed on said plurality of signal lines, second dummy pixels which remove noise superposed on said plurality of scanning lines, a second signal line to read out electronic signals from said first and second dummy pixels, and a second scanning line to scan said first and second dummy pixels; and claim 11 in which said electrostatic dispersion wiring line is connected directly or via a nonlinear element to at least one of said plurality of first signal lines, said second signal line, at least one of said plurality of first scanning lines, and said second scanning line, and has a second auxiliary wiring line to disconnect said electrostatic dispersion wiring line between a connecting portion between a connecting portion between said electrostatic dispersion wiring line and at least one of said plurality of first signal lines and a connecting portion between said electrostatic dispersion wiring line and said second signal line, or between a connecting line between said electrostatic dispersion wiring line and at least one of said plurality of first scanning lines and a connecting portion between said electrostatic dispersion wiring line and said second scanning line. 13. The detector according to  claim 11 , which further comprises first dummy pixels which remove noise superposed on said plurality of signal lines, second dummy pixels which remove noise superposed on said plurality of scanning lines, a plurality of second signal lines to read out electronic signals from said first dummy pixels, and second scanning lines to scan said second dummy pixels, and in which said electrostatic dispersion wiring line has a first wiring line which is connected to at least one of said plurality of first signal lines and at least one of said plurality of second signal lines, a second wiring line which is connected to at least one of said plurality of first scanning lines, and a third wiring line which is connected to at least one of said plurality of second scanning lines. claim 11 14. The detector according to  claim 13 , further comprising a resistor which connects said first, second, and third wiring lines. claim 13 15. The detector according to  claim 14 , wherein said resistor has a resistance value which prevents dielectric breakdown caused by static electricity accumulated in at least one of said plurality of first signal lines or said plurality of first scanning lines. claim 14 16. The detector according to  claim 13 , further comprising a third auxiliary wiring line which is connected to said first, second, and third wiring lines, and cuts off electrical connection between said wiring lines. claim 13 17. An X-ray flat panel detector comprising: an effective pixel array in which a plurality of pixel electrodes are arrayed in a matrix and accumulate charges;  a photoconductor which covers said effective pixel array and generates charges on the basis of incident X-rays;  a plurality of first signal lines to read out electronic signals from said effective pixel array;  a plurality of first scanning lines to scan said effective pixel array;  an electrostatic dispersion wiring line which is connected directly or via a nonlinear element to at least one of said plurality of first signal lines and at least one of said plurality of first scanning lines, and distributes static electricity accumulated in at least one of said plurality of first signal lines or said plurality of first scanning lines;  first dummy pixels which remove noise superposed on said plurality of signal lines;  second dummy pixels which remove noise superposed on said plurality of scanning lines;  a plurality of second signal lines to read out electronic signals from said first dummy pixels; and  second scanning lines to scan said second dummy pixels,  wherein said electrostatic dispersion wiring line has  a first wiring line which is connected to at least one of said plurality of first signal lines and at least one of said plurality of second signal lines,  a second wiring line which is connected to at least one of said plurality of first scanning lines, and  a third wiring line which is connected to at least one of said plurality of second scanning lines. 18. The detector according to  claim 17 , further comprising a resistor which connects said first, second, and third wiring lines. claim 17 19. The detector according to  claim 18 , wherein said resistor has a resistance value which prevents dielectric breakdown caused by static electricity accumulated in at least one of said plurality of first signal lines or said plurality of first scanning lines. claim 18 20. The detector according to  claim 17 , further comprising a third auxiliary wiring line which is connected to said first, second, and third wiring lines, and cuts off electrical connection between said wiring lines. claim 17