| 摘要 |
<p>The present invention provides a focus mask (30) and frame assembly (10) for a cathode ray tube (1). The cathode ray tube includes an evacuated envelope (2) enclosing a luminescent screen (12), a focus mask, and a support frame (20) having at least two long sides (22,24) for supporting the focus mask between the electron gun (13) and the screen within the cathode ray tube. The focus mask has an active array area (37) formed of a plurality of strands and cross wires (34) separated by an insulating material and defining a plurality of focusing apertures within the array area. A border (46) is attached to the strands (32) opposite the insulating material along the upper and lower outer edges (42) of the active array area. The borders extend into the active array area such that the cross wires overlie a portion of the borders and the borders form focusing apertures with the strands along the upper and lower edges of the array.</p> |
