Color cathode ray tube

A cathode ray tube and color technology, applied in the direction of cathode ray tubes/electron beam tubes, discharge tubes, electrical components, etc., can solve the problems that the positional relationship is not disclosed, the added value is reduced, etc., to ensure mass production rate and increase the effective diameter , Improve the effect of magnetic coupling

Inactive Publication Date: 2004-09-08
HITACHI LTD
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the skirt 43 of the shadow mask 41 is fixed to the side wall 45 of the shadow mask frame 44, there is such a problem that the skirt 43 contacts the side wall 45 in the middle of the sides, and the gap between the skirt 43 of the shadow mask 41 and the shadow mask frame 44 Create voids at corners 49
In addition, there arises such a problem that it is necessary to form a protrusion 47 at each corner of the side wall 45, and the effective area of ​​the curved surface 42 is reduced by an increase equal to the gap with respect to the size of the shadow mask 44.
However, the shape of the mask frame for fixing the shadow mask or the positional relationship between the shadow mask and the mask frame has not been disclosed at all.

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
  • Color cathode ray tube
  • Color cathode ray tube
  • Color cathode ray tube

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0062] figure 2 is used for figure 1 A perspective view of an example of a shadow mask 5 in a color cathode ray tube, Fig. 3 is figure 2 A top view of the shadow mask assembly 5 in .

[0063] exist figure 2 And in Fig. 3, reference numeral 6a represents the curved surface of shadow mask 6, 6b represents the skirt of shadow mask assembly 6, 6b 1 、6b 2 、6b 3 and 6b 4 Represents the four sides of the skirt 6b, 7a represents a side wall of the shadow mask frame 7, 7a 1 、7a 2 、7a 3 , and 7a 4 7b represents the four sides of the wall 7a, 7b represents the reed, and 7c represents the protrusion on the shadow mask frame 7. exist figure 2 and Figure 3, with figure 1 Other identical elements in have the same label. Axis A is an axis that passes through the center of the mask assembly and is approximately parallel to the smaller sides of the assembly; axis B is an axis that passes through the center of the mask assembly and is approximately parallel to the longer sides...

no. 2 example

[0092] Figure 8 is a top view of a shadow mask assembly of a second embodiment of the present invention. Reference numeral RF1 represents the radius of curvature of the longer side inside the sidewall, RM1 represents the radius of curvature of the edge of the shadow mask, RF2 represents the radius of curvature of the smaller side inside the sidewall, and RM2 represents the radius of curvature of the smaller side of the edge of the shadow mask. Other parts that are the same as those in Fig. 3 are designated with the same reference numerals.

[0093] In the case of the present embodiment, the value of the radius of curvature RF1 or RF2 on the inner side of the side wall on one side of the mask frame 7 is set to be smaller than the radius of curvature RM1 or RM2. According to the present embodiment, the gap at the central part of the joint area between the four-sided skirt of the shadow mask and the shadow mask frame and the corresponding four-sided side walls is relatively inc...

no. 3 example

[0098] Figure 9 is a top view of a shadow mask assembly according to a third embodiment of the present invention. The same components as in Fig. 3 are given the same reference numerals. In the case of this embodiment, the shadow mask 6 is made of Invar. Since Invar is hard, the skirt 6b is made shorter.

[0099] Figure 10A shown along Figure 9 In the A-A line Figure 9 Sectional view of the longer side of the medium, Figure 10B shown along Figure 9 of the B-B line in Figure 9 Cutaway view of the shorter side of the medium, Figure 10C shown along Figure 9 The C-C line in Figure 9 Cutaway view of the corner in .

[0100] The feature of this embodiment is that the skirt 6b of the shadow mask is closer to the side wall of the shadow mask frame than the protrusion 7c formed at the nearest edge between the flange 71a and the side wall 7a, that is, The skirt 6b is closer to the phosphor screen than the protrusion 7c formed at the nearest edge. Therefore, even if...

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 color cathode ray tube including a shadow mask assembly and an inner shield provided for the shadow mask assembly which are disposed within the tube. The shadow mask assembly includes a substantially rectangular shadow mask, a substantially rectangular mask frame, and a spring for mounting the shadow mask assembly in the panel of the cathode ray tube. The shadow mask has a curved surface having electron beam passing holes and a skirt folded from the margin of the curved surface and extending in a tube axis direction. At least one of the major and minor sides of the substantially rectangular shadow mask has a curvature convex to the tube axis with corners thereof being round and at least one of the major and minor sides of the substantially rectangular mask frame is linear or has a curvature concave to the tube axis with corners thereof being round.

Description

[0001] This application is a divisional application of the patent application filed on March 11, 1997 with the application number 97109626.0 and the title of the invention "Color Cathode Ray Tube". technical field [0002] The present invention relates to a color cathode ray tube, and more particularly to a color cathode ray tube in which the effective area of ​​a shadow mask is enlarged and the magnetic shielding property and the ringing prevention property of the shadow mask assembly are improved. Background technique [0003] A color cathode ray tube generally includes a vacuum envelope (glass envelope) having a panel on its front side with a phosphor screen formed therein, an elongated neck on its rear side and housing an electron gun, and a glass connecting the panel and the neck. a cone; a shadow mask assembly mounted within the panel; a magnetic shield disposed within the tube at the junction between the panel and the funnel; and a deflection yoke disposed outside the ...

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
IPC IPC(8): H01J29/07
CPCH01J2229/0766H01J29/073H01J29/07H01J2229/0722H01J31/00
Inventor 能势寿司前原睦岩田刚
Owner HITACHI 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