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. 20, 1976
Filed:
May. 28, 1974
Applicant:
Inventors:
Rudolf G Hutter, New York, NY (US);
Herman O Dressel, Lynnfield, MA (US);
Assignee:
GTE Laboratories Incorporated, Waltham, MA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315 30 ; 315383 ;
Abstract
An electron gun for use in a cathode-ray tube is provided with two control grids between the cathode and an accelerating electrode. The control grids are both provided with separate control voltages bearing the same intensity-modulation information for control of the electron beam from the cathode. The two control voltages are caused to vary, one according to a linear function of the variation of the other. When this linear function is caused to have a particular slope, the area of the cathode which emits the electron beam remains approximately constant over a wide range of control voltage.