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Deflection unit for self-conveying cathode-ray tubes with reduced trapezoid differential

A cathode ray tube, vertical deflection technology, applied in the direction of cathode ray tube/electron beam tube, discharge tube, electrical components, etc., can solve the problem of not being suitable for reducing trapezoidal difference and so on

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

[0011] This solution is not suitable for reducing the resulting trapezoidal difference at odd points on the border of the screen, that is to say at 1 o'clock when the trapezoidal difference is prominently manifested

Method used

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  • Deflection unit for self-conveying cathode-ray tubes with reduced trapezoid differential
  • Deflection unit for self-conveying cathode-ray tubes with reduced trapezoid differential
  • Deflection unit for self-conveying cathode-ray tubes with reduced trapezoid differential

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Embodiment Construction

[0021] like figure 1 As shown, the self-converging color display device includes a cathode ray tube, and the cathode ray tube is equipped with a vacuum glass casing 6; an array of phosphors representing various colors, and these phosphors are arranged at one end of the casing to form a display fluorescent screen 9; and A set of electron guns 7 at the second end of the casing. The electron gun group is set so that it can generate three horizontally aligned electron beams 12 to respectively excite one of the phosphors of each color. Utilize the deflection yoke 1 or the deflector placed on the tube neck 8, the electron beam scans the whole fluorescent screen surface, wherein the deflection yoke 1 or the deflector includes a pair of horizontal deflection coils 3 and a pair of vertical deflection coils 4, through the isolator 2 make They are isolated from each other, as well as a magnetic core 5 made of ferrite material, which concentrates the field at the designed point of actio...

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PUM

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Abstract

Electromagnetic deflection unit for color cathode-ray tubes, comprising a pair of frame deflection coils and a pair of line deflection coils, at least one of these two pairs of coils having the shape of a saddle, each saddle-shaped deflection coil(3)having a rear bundle(19)placed on the side facing the electron gun and a front bundle(29)on the side facing the screen, two lateral harnesses of conductors connecting the front bundle to the rear bundle, each lateral harness being characterized in that the external edge of the said lateral harness lies in a radial angular position close to 0 DEG at the rear of the coil and in a radial angular position greater than 5 DEG at the front of the coil, so as to minimize the trapezoid differential error between the red and blue beams.

Description

technical field [0001] The present invention relates to a deflection unit of a color cathode ray tube. The unit may also be called a deflector, which includes a pair of vertical deflection coils and a pair of saddle-shaped horizontal deflection coils. This special shape minimizes trapezoid errors. Background technique [0002] CRTs designed to produce color images usually include an electron gun that emits three coplanar electron beams, each of which excites luminescent material on the tube's phosphor screen corresponding to a primary color (red, green or blue). [0003] The electron beam scans the phosphor screen of the tube under the influence of the deflection fields produced by the horizontal and vertical deflection coils of the deflector fixed to the neck of the tube. A ring of ferromagnetic material generally surrounds the deflection yoke so as to concentrate the deflection field in the appropriate area. [0004] The three electron beams produced by the electron gun s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J29/76
CPCH01J29/762H01J29/76
Inventor N·阿兹O·马森S·沃拉蒂尔
Owner THOMSON LICENSING SA