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:
May. 06, 1980
Filed:
Sep. 27, 1977
Applicant:
Inventors:
Gunther Kurbitz, Aalen-Ebnat, DE;
Walter Wegener, Aalen, DE;
Hans-Richard Weinheimer, Konigsbronn, DE;
Assignee:
Carl Zeiss-Stiftung, Oberkochen, DE;
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315 10 ; 358219 ;
Abstract
The invention contemplates circuit arrangements to protect the target of an image-producing tube from injuriously high local current densities, wherein detector means is responsive to produce an electrical pulse at onset of an unacceptably high local-illumination intensity condition at the cathode. The target-cathode excitation circuit includes switch means with a resistance-changing characteristic, and so connected to respond to the electrical pulse as to rapidly reduce electron flow between the cathode and target of the tube, upon occurrence of such electrical pulse output.