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Inner mask of color CRT

A color and inner cover technology, applied in the direction of discharge tubes, cathode ray tubes/electron beam tubes, electrical components, etc., can solve the problems of reduced efficiency of shielding the earth's magnetic field, reduced product reliability, and reduced efficiency

Inactive Publication Date: 2002-07-10
MERIDIAN SOLAR & DISPLAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] For example, compare Figure 2B , because the height (h1) of the vertical portion 62 is too small for the height (H) of the inner cover 60 formed by the vertical portion 62 and the slope portion 63, the slope portion 63 is separated from the cone 20 by a large distance (d), resulting in Reduced effectiveness of shielding the Earth's magnetic field
[0015] In the case where the inner cover 60 is used for a color CRT product and used for a period of time, since the efficiency of shielding the earth's magnetic field decreases, the degree of variation of the landing point of the electron beam associated with the change of the external magnetic field becomes large, resulting in a reproduced image Color Bleeding Problems due to Color Mixing
[0016] When color diffusion occurs due to these factors, the value of CRT products pursuing high image quality is reduced, and the reliability of products is also reduced

Method used

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  • Inner mask of color CRT
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  • Inner mask of color CRT

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Embodiment Construction

[0029] Preferred embodiments of the invention will now be described in detail, some of which are illustrated in the accompanying drawings.

[0030] The color CRT can have many embodiments, the most preferred embodiment of which will be described below.

[0031] image 3 is a partial cutaway side view showing a color CRT in which the inner cover is a preferred

[0032] Example made.

[0033] Figure 4A and Figure 4B Respectively, a front view and a rear view, representing an inner cover of a color CRT made according to a preferred embodiment of the present invention, and Figure 5 It is a sectional view taken along line A-A in Fig. 4 according to a preferred embodiment of the present invention.

[0034] The reference numerals used in the present invention are the same as those used in the previous description of the conventional art.

[0035] The inner cover 60 of the present invention includes a vertical portion 62 extending parallel to the central axis (X) of the CRT, ...

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PUM

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Abstract

A color CRT having an inner shield being mounted at a frame inside a panel and a funnel to shield an earth magnetic field, in which the inner shield comprises: a vertical portion formed in parallel to the central axis of the CRT and mounted at the frame, a slope portion extended slanted against the central axis of the CRT at a rear side of the vertical portion and a notch with its central portion formed concave at the end portion of the slope portion, the opposite of the frame; and on the assumption that the entire height of the inner shield constructed with the vertical portion and the slope portion is 'V', a height (V1) of the vertical portion satisfies the relational expression of 0.18 H01J 29 / 06 4 5 18 2001 / 10 / 30 1357904 2002 / 7 / 10 1187785 2005 / 2 / 2 2005 / 2 / 2 2005 / 2 / 2 LG Electronics Inc. Korea Lee Ho-do wei xiaogang 11105 Korea 2000 / 12 / 15 76816 / 00

Description

technical field [0001] The present invention relates to a color CRT, particularly to an inner cover of a color CRT. By improving the structure of the inner cover, the shielding effect can be improved, and due to the improved shielding effect, by reducing the impact of electron beams related to changes in the external magnetic field Variation, which prevents color bleeding caused by color mixing when reproducing images. Background technique [0002] figure 1 It is a partial side view showing the internal structure of the CRT, in which there is an inner cover made by traditional technology. Figure 2A and Figure 2B Respectively, the rear view and the plan view show the inner cover made by this traditional technology. [0003] Such as figure 1 As shown, the color CRT is composed of a panel 10 and a cone 20; the panel 10 is coated with red, green, and blue fluorescent materials 11 on its inner surface; the cone 20 is fixed on the panel 10 with solder glas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J29/02H01J29/06
CPCH01J2229/0023H01J29/06H01J29/02
Inventor 李浩道
Owner MERIDIAN SOLAR & DISPLAY