Color picture tube

Abstract

The radii of curvature RD, RS and RL along a diagonal axis, a short side and a long side of an outer surface of a useful portion of a panel whose inner surface is provided with a phosphor screen satisfy RD>=10 m, RS>RD, and RL>RD. This makes it possible to provide a color picture tube that has an excellent visibility and is not susceptible to the deterioration in color purity due to doming, while including a shadow mask with excellent formability and strength.

Description

technical field [0001] The present invention relates to a color picture tube provided with a shadow mask. Background technique [0002] Generally, as shown in FIG. 7, a color picture tube has a glass peripheral device 9 composed of a substantially rectangular panel 1 and a funnel-shaped funnel cover 2 joined to a side wall 1b. The periphery of the portion 1a is provided with a side wall portion 1b. On the inner surface of the effective part 1a of the panel 1, there are provided a black non-luminescent material layer and a substantially rectangular phosphor composed of green, blue and red phosphors embedded in the gap between the black non-luminescent material layers. body screen3. Each phosphor is formed in a stripe shape along the short side direction, and a plurality of stripes of the phosphors are arranged along the long side direction. [0003] A shadow mask structure 5 is provided to face the phosphor screen 3 . The shadow mask structure 5 is composed of a shadow ma...

AI Technical Summary

Problems solved by technology

Therefore, in the case of flattening the outer surface of the effective portion 1a of the panel 1, a reinforcement tape that generates a large fastening force is required, which prevents cost reduction of the reinforcement tape 12.

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