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Unified magnetic shielding of tensioned mask/frame assembly and internal magnetic shield

A technology of magnetic shielding cover and shadow mask, which is applied in the field of shielding cover devices, and can solve problems such as poor image quality, poor magnetic flux coupling, and poor purity

Inactive Publication Date: 2007-07-04
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes degaussing of the frame more difficult, causes poor flux coupling during degaussing, and leads to very high residual fields inside the CRT
These residual magnetic fields cause CRTs to have high electron beam image misregistration, poor purity and poor image quality

Method used

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  • Unified magnetic shielding of tensioned mask/frame assembly and internal magnetic shield
  • Unified magnetic shielding of tensioned mask/frame assembly and internal magnetic shield
  • Unified magnetic shielding of tensioned mask/frame assembly and internal magnetic shield

Examples

Experimental program
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Effect test

Embodiment Construction

[0021] FIG. 1 shows a cathode ray tube 1 (CRT) having a glass bulb 2. The glass bulb 2 includes a rectangular phosphor screen panel 3 connected by a glass cone 5 and a tubular neck 4. The funnel 5 has an inner conductive coating (not shown) extending from the anode button 6 to the face plate 3 and the neck 4. The panel 3 includes a substantially cylindrical or rectangular observation panel 8 and a peripheral flange or side wall 9, and is sealed to the funnel 5 by a glass frit 7. A three-color phosphor screen 12 is provided on the inner surface of the phosphor screen panel 3. The phosphor screen 12 is a line phosphor screen having phosphor lines arranged in groups of three, and each of the three phosphor lines in this group corresponds to a phosphor line of one of the three colors. According to a predetermined interval relationship with the phosphor screen 12, the color selection tension shadow mask assembly 10 is detachably installed. The electron gun 13 schematically shown by the...

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PUM

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Abstract

The present invention provides a cathode ray tube (CRT) (1), comprising a tensioned mask frame (20) for supporting a tension mask (10) inside the CRT at a cantilevered edge thereof, a tension mask mounted on the tension mask frame at the cantilevered edge; and an internal magnetic shield (50) mounted on the tension mask frame. At least one of the tension mask (30) and the internal magnetic shield (50) have an extension (55, 56) extending along the tensioned mask frame (20) to a point proximate or contacting the other of the tension mask (30) and the internal magnetic shield (50) to provide magnetic coupling between the tension mask and the internal magnetic shield independent of the tensioned mask frame.

Description

[0001] Cross references to related applications [0002] This application claims the priority of the U.S. Provisional Patent Application No. 60 / 574887 filed on May 27, 2004 with the title of "Cathode ray tube with uniform magnetic shield and inner magnetic shield with tension shadow mask / frame assembly" Right, the entire contents of which are incorporated herein for reference. Technical field [0003] The present invention relates to a cathode ray tube (CRT), and more particularly to a shield device for a tension shadow mask / frame assembly and an inner magnetic shield (IMS). Background technique [0004] A color cathode ray tube, or CRT, contains an electron gun for generating and directing three electron beams to the tube phosphor screen. The phosphor screen is located on the inner surface of the phosphor screen panel of the ray tube, and is formed by an array of phosphor units of three different luminous colors. The shadow mask, which can be a shaped shadow mask or a tension sha...

Claims

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Application Information

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IPC IPC(8): H01J29/02H01J29/07H01J31/20H01J29/06
CPCH01J2229/003H01J29/06H01J2229/0766H01J29/07
Inventor P·芬克尔R·R·穆特索
Owner THOMSON LICENSING SA
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