The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 1995
Filed:
May. 16, 1991
Kenji Sameshima, Hachioji, JP;
Tatsuo Makishima, Tokyo, JP;
Tadaaki Hirai, Koganei, JP;
Yukio Takasaki, Mobara, JP;
Misao Kubota, Kawasaki, JP;
Kenkichi Tanioka, Tokyo, JP;
Keiichi Shidara, Tama, JP;
Hitachi, Ltd., Tokyo, JP;
Nippon Hoso Kyokai, Tokyo, JP;
Abstract
An image pickup tube is provided with the third electrode to control the potential of the region which is not scanned by an electron beam in the image pickup tube target section including a target electrode and a photo-conductive film. A method for operating this image pickup tube is also disclosed. Thus, undesired image phenomena which are generated when the image pickup tube is used with a relatively high target voltage, e.g., image distortion, shading, a waterfall phenomenon and image inversion phenomenon can be suppressed, thereby realizing a high sensitivity image pickup tube.