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Color picture tube having an inline electron gun

A technology of picture tube and electron gun, applied in the field of color picture tube, can solve problems such as high cost

Inactive Publication Date: 2003-10-15
THOMSON TUBES & DISPLAY SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This weakening of the magnetic field requires higher power circuitry or higher sensitivity coils, resulting in undesirably higher costs

Method used

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  • Color picture tube having an inline electron gun
  • Color picture tube having an inline electron gun
  • Color picture tube having an inline electron gun

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Experimental program
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Embodiment Construction

[0009] figure 1 A rectangular color display tube 10 is shown having a glass envelope 11 comprising a rectangular panel 12 and a neck 14 connected by a rectangular cone 15 . Cone 15 has an inner conductive coating (not shown) extending from anode knob 16 to neck 14 . Panel 12 includes viewing panel 18 and a peripheral flange or side wall 20 sealed to cone 15 by frit 17 . The three-color fluorescent screen 22 is disposed on the inner surface of the panel 18 . The fluorescent screen 22 is preferably a striped fluorescent screen having fluorescent stripes arranged in triplets, each triplet including fluorescent stripes of each of the three colors. In addition, the fluorescent screen may also be a dotted fluorescent screen. A perforated color selection electrode or shadow mask 24 is detachably mounted at predetermined intervals relative to the phosphor screen 22 by conventional means. figure 1 An electron gun 26 indicated by a dotted line is centrally mounted in the neck 14 for...

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Abstract

The present invention relates to a color picture tube (10) having a viewing screen (22), and an electrode gun (26) within a neck (14) of the tube for generating and directing three in line electron beams, a center beam and two side beams, toward the screen. The electron gun includes a plurality of electrodes including a focus electrode (G5). The tube neck is adapted for receipt of a surrounding scan velocity modulation coil (54, 56) at a location thereon. The focus electrode includes two spaced parts (44, 46) that are electrically connected and adapted for connection to the same focus voltage (VFOCUS). The space (45) between the parts is surrounded by the neck location for the coil.

Description

technical field [0001] This invention relates to an improved color picture tube having an inline electron gun, and more particularly to a tube having an inline electron gun including a slit focusing electrode. Background technique [0002] For color picture tubes, the sharpness of the image depends on having a small electron beam spot size on the tube's viewing phosphor screen. In this tube, an electron gun produces three electron beams that must be simultaneously focused into small spots on a phosphor screen. Scan Velocity Modulation (SVM) is known to be achieved with coils on the neck. The SVM coil is a bipolar device arranged to generate a vertical magnetic field that deflects the electron beam horizontally. This coil improves the image quality of the tube by modulating the horizontal deflection velocity of the electron beam. The SVM coil is driven as a function of the video signal. As video frequencies increase, eg from NTSC to VGA and SVGA frequencies, the SVM coils...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/48H01J29/50
CPCH01J2229/5687H01J2229/7037H01J29/503H01J29/50
Inventor O·P·特林切洛M·A·汤姆森R·L·巴宾R·H·米勒
Owner THOMSON TUBES & DISPLAY SA