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:
Dec. 21, 1976
Filed:
May. 17, 1974
Applicant:
Inventors:
Assignees:
Hitachi, Ltd., BOTH OF, J;
Hitachi Electronics Co., Ltd., BOTH OF, J;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358219 ; 178D / ;
Abstract
A method and system for controlling the quantity of an electron beam in a camera tube in which scanning beam current scans a target electrode to be converted into signal current by the target electrode and this signal current is fed back in the form of a voltage signal to a beam control electrode through a feedback circuit, the amplification factor of this feedback circuit being selected to be smaller than the reciprocal of the maximum efficiency of conversion of the scanning beam current into the signal current.