Cathode-ray tube and electron gun structure therefor

Electric lamp and discharge devices – Cathode ray tube – Ray generating or control

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

313448, H01J 2956, H01J 2962

Patent

active

047059850

ABSTRACT:
A cathode-ray tube comprising in an evacuated envelope a diode electron gun for generating an electron beam. The electron gun includes a cathode arranged on an axis with its emissive surface extending substantially perpendicularly to the axis, and an anode extending substantially perpendicularly to the axis and having an aperture opposite to the cathode, the electron beam being focused on a target by means of at least one focusing lens. The cathode-ray tube is a picture display tube, the target is a display screen, and the spacing between the anode and the cathode of the diode electron gun is smaller than 200 .mu.m. The electron beam generated in the operating tube, viewed in the direction of propagation, is focused to form a cross-over immediately after the anode by a positive electron lens. The cross-over, which is displayed on the display screen by means of the focusing lens, has a current density on the axis which is larger than three times the current density in the point of intersection of the axis with the cathode. Because of this high current density crossover, a comparatively large electron beam current (1-5 mA) spot is formed on the display screen having a diameter which is smaller than the diameter of the spot formed by known cathode-ray display tubes having triode electron guns. The part of the anode including the aperture preferably consists of a thin metal foil which extends perpendicularly to the axis, and the thickness d of the foil divided by the radius r of the aperture is smaller than 1 (.sup.d /r<1). Such a tube is particularly suitable for use as a projection television tube or a D.G.D.-tube.

REFERENCES:
patent: 2887600 (1959-05-01), Fyler
patent: 4540916 (1985-09-01), Maruyama et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Cathode-ray tube and electron gun structure therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cathode-ray tube and electron gun structure therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cathode-ray tube and electron gun structure therefor will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1069916

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.