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Tension shadow mask frame assembly for CRT

A frame and shadow mask technology, applied in the field of color cathode ray tubes, can solve the problem of high cost and high price

Inactive Publication Date: 2006-03-01
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this structure is attractive from a performance standpoint, the system cost is prohibitive from a manufacturing standpoint

Method used

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  • Tension shadow mask frame assembly for CRT
  • Tension shadow mask frame assembly for CRT
  • Tension shadow mask frame assembly for CRT

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] figure 1 A conventional cathode ray tube 10 having a glass envelope 11 is shown, comprising a rectangular phosphor screen panel 12 and a tubular neck 14 connected by a rectangular funnel 15 . An intrinsic conductive coating (not shown) on the funnel 15 extends from an anode stud 16, 17 to the neck 14 of the tube. Panel 12 includes a viewing panel 18 and peripheral flanges or side walls 20 sealed to funnel 15 by glass frit 21 . The inner surface of the screen 18 carries a screen 22 (the finer details of which are not shown). The screen 22 is a line screen having phosphor lines arranged in three-dot phosphor groups, each three-dot phosphor group including phosphor line patterns of each of three colors. The phosphor lines are approximately parallel to the minor axis Y of the kinescope. The wire tension mask assembly 24 is movably mounted at a predetermined interval with respect to the screen 22 . figure 1 An electron gun 26, shown in dashed lines, is mounted centrally ...

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PUM

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Abstract

A tension mask frame assembly (24) for a color cathode-ray-tube comprising a frame having four respective sides, two of the sides paralleling each other and having insert receiving brackets (56) for supporting strand termination inserts (58) therein and vertical mask strands (44) welded to said termination inserts. The strands have a plurality of cross-wires (46) extending perpendicular to the strands and attached thereto by a conductive bonding material (50). The wires and termination inserts are composed of materials having a first coefficient of thermal expansion. The frame and receiving brackets are composed of materials having a second coefficient of thermal expansion. The termination inserts thermally expand and contract independently of the frame and receiving brackets, whereby movement of the strands in the horizontal dimension is controlled by thermal expansion and contraction of the termination inserts and cross-wires.

Description

technical field [0001] This invention relates to color cathode ray tubes (CRTs), and more particularly to a tensioned mask frame assembly having improved microphonic and thermal expansion behavior. Background technique [0002] A conventional shadow mask type color cathode ray tube generally includes an electron gun for forming and directing three electron beams to the screen of the cathode ray tube. The screen is on the inner surface of the phosphor screen of the tube and consists of an array of three different colored phosphorescent compositions. A shadow mask is interposed between the electron gun and the screen so that each electron beam impinges only on the phosphor components associated with that beam. In most cathode ray tubes, the shadow mask is a dome-like thin metal sheet which itself retains its structure with the inner surface of the cathode ray tube phosphor screen and is supported by a shadow mask frame. The shadow mask acts as a visual barrier, obscuring the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/07H01J29/02
CPCH01J29/073H01J2229/0722H01J29/07
Inventor I·戈罗J·J·米查尔楚克R·W·诺斯克P·M·海曼
Owner THOMSON LICENSING SA