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:
Jun. 08, 1993
Filed:
Apr. 18, 1989
Jean-Luc Ricaud, Voreppe, FR;
Gerard Guilhem, Saint Egreve, FR;
Thomson-CSF, Puteaux, FR;
Abstract
A television camera tube with spurious image black-out screen is disclosed. Especially in image pick-up tubes where the electron beam, scanning a photosensitive target, is oriented by a system of electrostatic deflection, it has been observed that spurious images appear in the output video signal of the tube. These images are apparently due to a return beam that comes back from the target and strikes the accelerating electrode of the electron gun. To black out these spurious images, it is proposed to mask the accelerating electrode with a masking screen carried, in principle, to the same potential as the electrode, this screen being characterized by its rounded edges, with their convexity pointed towards the target. It is perforated with a central aperture, also provided with rounded edges.