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AssigneeHitachi, Ltd.
InventorsKazuhiro Satou, Koji Kudo, Masanori Maruyama, Itaru Mimura, Shusaku Nagahara
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In an image pickup tube including a cathode, a first grid electrode disposed as a next stage of the cathode and provided with an aperture, a second grid electrode disposed as a next stage of the first grid electrode and provided with an aperture, and a photoconductive target, the first grid electrode is operated by a voltage positive with respect to the cathode. To control the amount of the electron beam of the image pickup tube, a voltage corresponding to a signal current obtained from the photoconductive target of the image pickup tube or to a return beam from the photoconductive target is applied to the second grid electrode in such a manner that a polarity of the applied voltage is opposite to a polarity of a signal charge generated on the photoconductive target.
A method for controlling the amount of an electron beam of an image pickup tube including a cathode, a first grid electrode disposed as a next stage of said cathode and provided with an aperture, a second grid electrode disposed as a next stage of said first grid electrode and provided with an aperture, and a photoconductive target, comprising the steps of:
A method for controlling the amount of an electron beam of an image pickup tube including a cathode, a first grid electrode disposed as a next stage of said cathode and provided with an aperture, a second grid electrode disposed as a next stage of said first grid electrode and provided with an aperture, and a photoconductive target, comprising the steps of:
An apparatus for controlling the amount of an electron beam of an image pickup tube including a cathode, a first grid electrode disposed as a next stage of said cathode and provided with an aperture, a second grid electrode disposed as a next stage of said first grid electrode and provided with an aperture, and a photoconductive target, comprising:
An apparatus for controlling the amount of an electron beam of an image pickup tube including a cathode, a first grid electrode disposed as a next stage of said cathode and provided with an aperture, a second grid electrode disposed as a next stage of said first grid electrode and provided with an aperture, and a photoconductive target, comprising:
Dependencies are inferred from the claim text.