Television camera tube with spurious image black-out screen

Details Television camera tube with spurious image black-out screen Television camera tube with spurious image black-out screen

1989-04-18

1993-06-08

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

313424, 313450, H01J 2970

Patent

active

052184439

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.

REFERENCES:
patent: 2719243 (1955-09-01), Hoagland
patent: 4075533 (1978-02-01), Janko
Patent Abstracts of Japan, vol. 11, No. 367 (E-561)[2814], Nov. 28, 1987; & JP-A-62 139 234 (Matsushita Electronics Corp) Jun. 22, 1987.
Patent Abstracts of Japan, vol. 9, No. 85 (E-308) [1808] Apr. 13, 1985; & JP-A-59 215 639 (Nippon Hoso Kyokai) Dec. 5, 1984.
N.H.K. Laboratories Note, No. 322, Nov. 1985, pp. 3-16, M. Kurashige et al.: L"1-inch magnetic-focus electrostatic-deflection compact saticon for HDTV".

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