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Weld-free mask support blade structure for CRT

A cathode ray tube and shadow mask technology, which is applied in the field of tension shadow mask components, can solve the problems of deformation of supporting parts, influence on the positioning of the phosphor screen of the shadow mask, labor and cost, etc.

Inactive Publication Date: 2006-07-05
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fabrication of such structures is usually laborious and costly due to the many welds required to strengthen the supports
The soldering operation also subjects the support to thermal expansion which can deform the support and affect the positioning of the shadow mask relative to the phosphor screen

Method used

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  • Weld-free mask support blade structure for CRT
  • Weld-free mask support blade structure for CRT
  • Weld-free mask support blade structure for CRT

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] FIG. 1 shows a color cathode ray tube 1 with a glass envelope 2 comprising a face plate 3 and a tubular neck 4 joined by a funnel 5 . The funnel 5 has an inner conductive coating (not shown) extending from the anode knob 6 to the face plate 3 and to the tubular neck 4 . Panel 3 comprises a viewing plate 8 and a peripheral flange or side wall 9 sealed to funnel 5 by a frit 7 . The three-color fluorescent screen 12 is carried by the inner surface of the panel 3 . The phosphor screen is a line phosphor screen having phosphor lines arranged in triplets, each triplet including phosphor lines of each of the three colors. The tensioned mask assembly 10 is detachably mounted in a predetermined spaced relation to the phosphor screen 12 . An electron gun 13, shown schematically by dashed lines in FIG. The tensioned mask assembly 10 is directed toward a phosphor screen 12 .

[0023] The cathode ray tube 1 is designed for use with an external magnetic deflection yoke 14, which ...

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PUM

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Abstract

The present invention provides an improved tension mask frame assembly (10) in which mask support members (40, 60, 70, 80, 90) are provided with a first side wall (42, 62, 70, 82, 92), a second side wall (46, 66, 76, 86, 96) and a back wall (44, 64, 74, 84, 94) that are held together primarily by means of either tabs (49, 87) formed along an edge of the back wall received into respective apertures (50, 88) in the side wall (42) or by means of a ridge (69, 89, 99) formed in the first side wall which abuts the back wall.

Description

technical field [0001] The present invention relates to a color cathode ray tube (CRT) having a tensioned mask, and more particularly to a tensioned mask assembly having supports for attaching the tensioned mask to a frame. Background technique [0002] A cathode ray tube (CRT) includes an electron gun for generating three electron beams and directing the electron beams to a phosphor screen of the CRT. The phosphor screen is located on the inner surface of the CRT panel and consists of an array of phosphor elements that emit three different colors. A color selective electrode, either a shadow mask or a focusing grid, is sandwiched between the electron gun phosphor screens to allow each electron beam to strike only the phosphor elements associated with that electron beam. [0003] Recently, CRTs with flatter panels have become more desirable. As CRTs became flatter, shadow masks needed to be flatter as well. Such flat shadow masks are prone to chatter or microphonic effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/07
CPCH01J29/073H01J29/02
Inventor 伊斯特万·格罗格沃尔特·D·马斯特顿艾伦·W·布赫
Owner THOMSON LICENSING SA