CRT with structure for preventing electron beam from miscontacting of screen caused by geomagnetism

A cathode ray tube and screen technology, applied in the direction of cathode ray tube/electron beam tube, discharge tube, eliminating unnecessary electromagnetic effects, etc., can solve the problems of deterioration of color purity of cathode ray tube, increase of horizontal offset of electron beam, etc.

Inactive Publication Date: 2006-02-08
SAMSUNG SDI CO LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the electron beam pointing to the corner is affected by the geomagnetism, and as a result, the horizontal offset of the electron beam increases
This causes the electron beam to land on unwanted phosphors, deteriorating the color purity at the corners of the phosphor screen of a CRT

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • CRT with structure for preventing electron beam from miscontacting of screen caused by geomagnetism
  • CRT with structure for preventing electron beam from miscontacting of screen caused by geomagnetism
  • CRT with structure for preventing electron beam from miscontacting of screen caused by geomagnetism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] Now see attached picture, such as Figure 7 As shown, the color selection device 1 includes a shadow mask 3 provided with a plurality of electron beam passing holes 3a and a frame 5 for supporting the shadow mask, which is applied with pretension. The frame 5 includes a pair of elastic members 5b and a pair of supporting members 5a connected to the elastic members 5b, and the shadow mask 3 is mounted on the supporting members 5a.

[0039] This color selection device is mounted on the inner surface of the panel 9 on which the fluorescent screen 7 is formed. The inner shield 11 is mounted on the support member 5a and the elastic member 5b such that it surrounds the electron beam emission locus to shield the electron beam from the earth's magnetism.

[0040] Geomagnetism includes vertical and horizontal components. The horizontal component can be divided into north-south component (N-S component) and east-west component (E-W component), the former is parallel to the tube...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A cathode ray tube includes a panel having a front screen portion on which a phosphor screen is formed and a panel flange formed on an edge of the front screen portion; a funnel connected to the panel flange; a deflection yoke disposed around the funnel; a neck connected to the funnel; an electron gun disposed in the neck; a color selection apparatus for selecting electron beams emitted from the electron gun and allowing the selected electron beams to land on corresponding phosphors, the color selection apparatus including a frame having a pair of supporting members disposed at a predetermined distance from each other in parallel and a pair of elastic members fixed on both ends of the supporting members to correspond to the lateral sides of the mask; and a shield apparatus for shielding geomagnetism, the shield apparatus being mounted on a circumference of the frame of the color selection apparatus and extended toward the neck. The shield apparatus includes disconnection parts defined corresponding to the corners of the frame, the shield apparatus being extended toward the phosphor screen over one of longitudinal and lateral sidewalls of the frame.

Description

technical field [0001] The present invention relates to a cathode ray tube (CRT), and more particularly, to a cathode ray tube having a structure for preventing electron beam mis-landing caused by geomagnetism. Background technique [0002] Generally, a CRT is configured to display images by scanning a phosphor screen provided with red R, green G, and blue B phosphors with electron beams emitted from an electron gun. [0003] The electron beam is deflected by the deflection yoke and lands on the desired phosphor to scan the peripheral portion and the middle portion of the phosphor screen. [0004] However, when the electron beams are deflected, they are affected by an external magnetic field such as the earth's magnetism, and the electron beams can land on undesired phosphors. This so-called mislanding reduces the color purity of the CRT. [0005] In order to solve the above problems, magnetic field shielding members such as inner shields for shield...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/06H01J29/02
CPCH01J2229/003H01J29/06H01J29/02
Inventor 李应硕金钟宪
Owner SAMSUNG SDI CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap