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:
Aug. 19, 1986
Filed:
Oct. 31, 1984
Erich E Himmelbauer, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Television camera tube comprising a tubular envelope of glass drawn on a mandril and having an internal conductive wall coating. A diaphragm having an aperture is supported in the envelope by a supporting surface extending transverse to the longitudinal axis of the envelope. The supporting surface is formed by a substantially stepwise change in the internal transverse dimension of the envelope. The conductive wall coating is interrupted at a distance from the diaphragm. The stepwise change in the internal transverse dimension of the envelope portion taking place in at least a first a step and second step. The first step forms the supporting surface for the diaphragm. The interruption (6) in the conductive wall coating is provided on the second step. If the diaphragm in such a tube is a flat plate and the distance d between the first step and the second step is between 0.4 D and D, where D is the inside diameter of the envelope between the first and the second step, the axial astigmatism.