Television camera tube with conductive wall coating and transver

Details Television camera tube with conductive wall coating and transver Television camera tube with conductive wall coating and transver

1984-10-31

1986-08-19

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313283, 313390, 313482, H01J 2902, H01J 2988

Patent

active

046071903

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.

REFERENCES:
patent: 2828433 (1958-03-01), Frenkel
patent: 4276494 (1981-06-01), Roosmalen et al.
van Roosmalen, J. H. T., et al., "A New Concept for Television Camera Tubes, Philips Technical Review, vol. 39, No. 8, pp. 201-210 (1980).

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