Appeal No. 2003-0279 Page 4
Application No. 09/644,795
The Admitted Prior Art shows a tension mask frame assembly of a flat CRT. The
tension mask frame assembly includes (1) a frame 10 comprising two support members
11, 12 spaced from each other, each of the support members having a fixing portion
and a flange portion; and two elastic members 13, 14 each having opposite end
portions fixed to the support members for supporting the support members; and (2) a
tension mask 20 having opposite edges fixed to the fixing portions of the support
members in a state when the tension mask is being stretched in a stretching direction
by a tensile stress tending to move the opposite edges of the tension mask away from
each other.
Tani's invention relates to a color cathode ray tube having a shadow mask 30.
As shown in Figures 1 to 4, the shadow mask 30 comprises a substantially rectangular
mask body 34 and a substantially rectangular mask frame 38 to which a skirt
portion 33 of the mask body is attached. The substantially rectangular mask frame 38
has a side wall portion 36 having a pair of short side walls 40 opposing to each other
and a pair of long side walls 41 opposing to each other. A curved inward protrusion 37
is protruded from the edge of the side walls as shown in Figure 4. Edges 40a of the
short side walls 40 are arc-shaped so as to correspond to the shape of the main
surface 31 of the mask body 34. Therefore, each short side wall 40 is higher at a
central portion thereof than at the ends of the side wall portion 36. On the other hand,
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