Image pick-up tube and apparatus having the same

An image pick-up tube apparatus for converting photo-signals into electrode signals, comprising:

• a cathode electrode for emitting an electron beam;
• a substrate;
• a target section having a surface layer and a photoconductive film for converting an electromagnetic wave into charge carriers as electric signals, the surface layer having a first area to be scanned by the electron beam and a second area not to be scanned by the electron beam, wherein the target section includes means for balancing a voltage of the second area with a voltage of the cathode electrode,
• a target electrode located adjacent and between the substrate and the photoconductive film, and
• means for scanning the first area by the electron beam so as to read the electrode signals,
• wherein the balancing means includes an insulating thin film located proximate the second area;
• and
• means for applying a voltage to the target electrode.