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Color cathode ray tube

A cathode ray tube, color technology, applied in the direction of cathode ray tube/electron beam tube, screen tube, discharge tube, etc., can solve the problems of difficult curved surface maintaining intensity, interval change, and deterioration of phosphor screen quality.

Inactive Publication Date: 2004-01-14
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, if such reinforcing ribs are provided on a shadow mask with a small effective surface curvature, and their positions and heights are set so as to obtain sufficient effects, the distance between the inner surface of the effective part of the glass screen and the effective surface of the shadow mask will change locally.
Therefore, when the phosphor screen is formed by photolithography using the shadow mask as a photomask, the reinforcing ribs will affect the quality of the phosphor screen.
Therefore, if considering the decline in the quality of the fluorescent screen, the step difference formed by the shadow mask or the protruding height of the reinforcing rib is limited to about 0.1~0.20mm
However, with ribs of this size and protrusion height, it is difficult to have a high enough surface to maintain strength for a shadow mask with a small effective surface curvature

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] As shown in FIG. 1, a color cathode ray tube has a casing 10 made of glass, which includes a panel 1 having a nearly rectangular shape and a glass screen 3 with a skirt portion 2 arranged vertically at an edge portion of the panel, and The funnel 4 to which the skirt part 2 is connected. The panel 1 has an effective portion 12 of approximately short shape formed by a curved surface, the effective portion has a horizontal axis X and a vertical axis Y passing through the tube axis Z and perpendicular to each other.

[0033] On the inner surface of the effective portion 12 is formed a fluorescent screen 5 composed of, for example, a large number of stripe-shaped three-color fluorescent screens extending parallel to the vertical axis and emitting blue, green, and red light. A shadow mask 20 having a nearly rectangular shape is provided inside the envelope 10 to face the phosphor screen 5 . Inside the neck 8 of the funnel 4 is provided an inline electron gun 14 emitting thr...

Embodiment 2

[0056] In other embodiments of the present invention as shown in FIG. 8, the shadow mask body 24 of the shadow mask 20, when the width between the long sides 21a of the effective surface 21 is ds, is centered on the long axis X and has ds / 3 In the wide area, there are several belt-shaped reinforcing ribs 28 extending parallel to the long axis X. The protruding heights of these reinforcing ribs 28 are set so as to satisfy the aforementioned conditions (1) and (2). In addition, other structures are the same as those of the foregoing embodiments, and their descriptions are omitted here.

[0057] In the case of a shadow mask with such a structure, the reinforcing ribs 28 do not affect the formation of the fluorescent screen, and the curved surface holding strength of the effective surface 21 can be improved, and the deformation of the shadow mask in the manufacturing process can be reduced and the shadow mask can be reduced during the operation of the color cathode ray tube. Bump...

Embodiment 3

[0059] Additionally, if Figure 9 In the illustrated embodiment, when the effective surface 21 of the shadow mask 20 is set to have a width dL between the short sides 21b of the effective surface 21, in a region centered on the short axis Y and having a width of dL / 3, there are Several belt-shaped reinforcing ribs 28 extending parallel to the axis y. The protruding heights of these reinforcing ribs 28 are set so as to satisfy the aforementioned conditions (1) and (2). In addition, other structures are the same as those of the foregoing embodiments, and their descriptions are omitted here.

[0060] In the case of a shadow mask with such a structure, the reinforcing ribs 28 do not affect the formation of the fluorescent screen, and the curved surface holding strength of the effective surface 21 can be improved, and the deformation of the shadow mask in the manufacturing process can be reduced and the shadow mask can be reduced during the operation of the color cathode ray tube....

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Abstract

A color cathode ray tube is provided with a shadow mask body including a substantially rectangular effective surface in which a large number of electron beam passage apertures are formed and a plurality of reinforcing beads are formed on the effective surface. Supposing: dX1 is a first position which is apart from a longer axis of the effective surface and a distance X1 apart from a shorter axis thereof, dX2 is a second position which is further apart from the longer axis than the first position and a distance X2 apart from the shorter axis, dY1 is a third position which is located on the shorter axis and a distance Y1 apart from the longer axis, dY2 is a fourth position which is a distance apart from the shorter axis and a distance Y2 apart from the longer axis, and X1=X2=Y1=Y2. At least a part of the formed reinforcing beads satisfies the following condition: dX1>dX2, dY1>dY2.

Description

technical field [0001] The present invention relates to a color cathode ray tube, in particular to a color cathode ray tube provided with reinforcing ribs for improving the strength of the curved surface of a shadow mask. Background technique [0002] Generally, a color cathode ray tube has a casing having a substantially rectangular panel having an effective portion formed of a curved surface and a skirt portion provided on the edge of the effective portion, and a funnel-shaped funnel. A fluorescent screen composed of three-color fluorescent layers emitting blue, green and red light is formed on the inner surface of the effective part of the glass screen. A substantially rectangular shadow mask is provided inside the phosphor screen opposite to it. In addition, an electron gun emitting three electron beams is installed in the neck of the funnel. [0003] The color cathode ray tube uses the deflection device installed outside the funnel to deflect the three electron beams ...

Claims

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Application Information

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IPC IPC(8): H01J29/07H01J31/20
CPCH01J2229/0727H01J29/07
Inventor 清水纪雄中川慎一郎井上雅及
Owner KK TOSHIBA
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