Unlock instant, AI-driven research and patent intelligence for your innovation.

Focusing lens structure for a cathode ray tube electron gun

A cathode ray tube and focusing lens technology, applied in the field of electron guns, can solve the problems of complex astigmatic fields, weakening, and difficult-to-focus electrode structures, etc.

Inactive Publication Date: 2006-11-08
THOMSON LICENSING SA
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the current trend is to make the visible surface of the front face of the tube as flat as possible; this requirement results in a field with astigmatism that is more complex and more difficult to attenuate by the structure of the focusing electrodes

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
  • Focusing lens structure for a cathode ray tube electron gun
  • Focusing lens structure for a cathode ray tube electron gun
  • Focusing lens structure for a cathode ray tube electron gun

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] figure 1 A sectional view according to a horizontal plane containing the longitudinal axis Z of the cathode ray tube 8 is shown. The tube consists of a glass envelope 10 comprising a rectangular front panel 12, a funnel-shaped rear portion 16 and a cylindrical sleeve 14 containing an electron gun 26 according to the invention. The panel 12 includes a front surface 18 and a peripheral flange 20 connecting the front surface to the funnel-shaped rear 16 . On the inner surface of the front surface 18 is a screen 22 composed of fluorescent material. The screen preferably comprises continuous lines for reproducing the three primary colors red, green and blue. A selection mask of 24 colors is typically located at a predetermined distance from the phosphor screen. Electron gun 26 emits three coplanar electron beams that pass through openings in shadow mask 24 and illuminate the network of glowing lines that make up screen 22 .

[0027] The tube 8 is designed to be used with...

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

Electron gun for colour cathode ray tube comprising two successive electrodes to form a focusing lens, both electrodes each comprising three in-line apertures. The extremity of the electrode 150 brought to the focusing voltage comprises a plate 110, drilled with in-line apertures 100, 101, 102. This plate is folded in such a manner that the lateral apertures 100, 102 are arranged in a plane different from the plane of the central aperture. The extremity edge 151 of the electrode 150 comprises an internal peripheral lip 120 that extends according to a longitudinal direction Z, following a width 171 at the level of the central aperture different from its width 170 at the level of the lateral apertures. This structure enables the two main functions of a focusing lens to be controlled independently: - the difference in focusing between the lateral beams and the central beam - the difference in astigmatism of the central beam with respect to the lateral beams.

Description

technical field [0001] The present invention relates to an electron gun for a cathode ray tube, and more particularly to an electron gun structure for a color picture tube designed to be incorporated into a cathode ray tube having a substantially flat front surface. Background technique [0002] A cathode ray tube designed to produce color images typically includes an electron gun that emits three electron beams, each beam designed to excite phosphors of the primary colors (red, green and blue) on the screen of the tube. [0003] The electron beam scans the screen of the tube under the action of a bias field generated by a deflection device, also known as a polarizer, which is fixed on the sleeve of the tube, the deflection device comprising the beam of longitudinal and vertical deflection coils. A pronounced cone-shaped ring of ferromagnetic material surrounds the deflection yoke in the conventional manner, thereby focusing the deflection field to the appropriate area. ...

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 Applications(China)
IPC IPC(8): H01J29/50H01J29/62
CPCH01J29/503H01J29/62H01J2229/481H01J2229/5635H01J29/48
Inventor 米歇尔·莱福特布鲁诺·克林格尔
Owner THOMSON LICENSING SA