Color picture tube

专利名称：Color picture tube

发明人：Shimizu, Norio,Nihei, Fumiaki,Uchikawa,

Toshio

申请号：EP05253331.2申请日：20050531公开号：EP1617455A1公开日：20060118

专利附图：

摘要：The radius of curvature of the outer surface of a panel (3) is 10,000 mm or more,and a shadow mask (7) is made of a material containing 95% or more of iron. A saggingamount change curve along a curve C1 on the surface of the shadow mask (7), which a

plane passing through a center P0 of a useful area of the shadow mask (7) and parallel toa tube axis and a major axis crosses, satisfies a particular Condition 1. Assuming that anintersection between the curve C 1 and a useful area end of the shadow mask (7) is amajor axis end PL, a distance from the center P0 to the major axis end PL along a majoraxis is W, and a point on the curve C1 away from the center P0 by 2/3 × W in the major axisdirection is P1, a sagging amount change curve along a curve C2 on the surface of theshadow mask (7), which a plane passing through the point P1 and parallel to the tube axisand the minor axis crosses, satisfies a particular Condition 2. Consequently, a color picturetube can be realized, which has satisfactory visibility, and less degradation in color puritycaused by doming while having a shadow mask made of an inexpensive material withsatisfactory moldability.

申请人：Matsushita Toshiba Picture Display Co., Ltd.

地址：1-1, Saiwai-cho Takatsuki-shi, Osaka 569-1193 JP

国籍：JP

代理机构：Tothill, John Paul

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