Tension mask frame for a cathode-ray tube (crt) having transverse scan
OwnerJoseph Reedinventor
Life of this patent
Estimating the term…
Abstract
A high aspect ratio cathode-ray tube (CRT) including a luminescent screen (28), an aperture mask (30) configured for transverse scan, an electron gun (32) and a magnetic deflection yoke (34). The electron gun (32) and the magnetic deflection yoke (34) are positioned so that the electron beams generated in the gun (32) scan a rectangular raster across the luminescent screen parallel to the tube minor axis (tranverse scan) to improve the current requirements for the magnetic deflection yoke (34).
Claims14
A cathode-ray tube (CRT) having a glass envelope defined by a faceplate panel and a tubular neck, a three-color phosphor screen formed on an inner surface of the faceplate panel and an electron gun positioned in the tubular neck and facing the phosphor screen, comprising:
- a tension mask configured for transverse scan affixed to a peripheral frame, wherein the tension mask has a center portion and edge portions proximate opposing ends of the tension mask, the edge portions having peripheral frequency distributions and the center portion having a central frequency distribution, wherein the central frequency distribution is greater than the peripheral frequency distributions to improve vibrational damping of the mask.
A tension mask for a cathode-ray tube (CRT), comprising:
- a peripheral frame;
- a tension mask configured for transverse scan affixed to the peripheral frame and having a center portion and edge portions, the edge portions proximate two opposing ends of the tension mask, the center portion having a central frequency distribution, the edge portions having peripheral frequency distributions wherein the central frequency distribution is greater than the peripheral frequency distributions and the frequency distribution from the edge portions to the center portion is represented by a parabolic formula wherein the variational range Δ between a peak value of the frequency distribution at the center portion and a minimum value of the frequency distribution at the edge portions is in the closed interval of about 8 Hz ≦Δ≦12 Hz.
A method for improving vibrational damping in a cathode-ray tube (CRT), comprising:
- fixing a tension mask configured for transverse scan to a peripheral frame such that a center portion of the tension mask has a central frequency distribution greater than peripheral frequency distributions of end portions of the tension mask.
Dependencies are inferred from the claim text.