Patent Number: 6,166,482

Title: Shadow mask structure with specific skirt portion

Abstract: In order to prevent doming effect in a shadow mask of a color cathode ray tube caused by thermal expansion of the shadow mask structure produced by heating of the shadow mask due to impingement of the electron beam thereon, the skirt portion of the shadow mask is provided, along at least one side thereof, with a long projection portion where the shadow mask is welded to the frame, an adjacent inclined portion which decreases in length toward the corner of the shadow mask and a short portion disposed therebetween the inclined portion and the corner. The inclined portion may decrease in length linearly or non-linearly.

Inventors: Taga; Hiroki (Mobara, JP), Hirai; Kazumasa (Mobara, JP), Mochizuki; Tatsuya (Mobara, JP)

Assignee: Hitachi, Ltd.

International Classification: H01J 29/07 (20060101); H01J 029/80 ()

Expiration Date: 12/26/2017