Patent ID: 6686684
Filing Date: 2004-02-03
Classification: H01J

Abstract:
A color selection electrode incorporated within a color cathode ray, said color selection electrode comprising:a shadow mask (10); and a frame including a first side (9B), a second side (9A), and a third side (9C), wherein said shadow mask (10) is attached to said first side (9B) and said second side (9A), and unattached to said third side (9C), wherein said first side (9B) includes a first bimetal element (16) fabricated from a first material having a first thermal expansion coefficient, wherein said first side (9B) further includes a second bimetal element (14) fabricated from a second material having a second thermal expansion coefficient that is less than the first thermal expansion coefficient, wherein said third side (9C) is fabricated from a third material having a third thermal expansion coefficient that is greater than the first thermal expansion coefficient, wherein, in response to a temperature increase of said frame, said first side (9B) and said second side (9A) reduce a first distance between a center of said first side (9B) and a center of said second side (9A), and reduce a second distance between a corner of said first side (9B) and a corner of said second side (9A), a reduction of the first distance being greater than a reduction of the second distance, and wherein, in response to the temperature increase of said frame, said third side (9C) reduces a third distance between a whole of said first side (9B) and a whole of said second side (9A).