Shadow mask having an effective face area and ineffective face a

Details Shadow mask having an effective face area and ineffective face a Shadow mask having an effective face area and ineffective face a

1997-11-12

2000-08-01

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313403, 313407, H01J 2980

Patent

active

060971428

ABSTRACT:
A stress reduction shadow mask of the present invention distributes the tension evenly across the entire surface so that a greater force may be applied to stretch the mask. The shadow mask comprises an effective face area constituting a central portion of the shadow mask. The effective face area has electron beam apertures, which electrons pass through. A secondary ineffective face area surrounds the effective face area and also has apertures. A frame attaching border further surrounds the secondary ineffective face area, and a primary ineffective face area at least partially surrounds the frame attaching border. Corners of the shadow are adjacent the primary ineffective face area and do not have apertures. Portions of the primary and/or secondary ineffective areas are treated with tie bar grading and/or have round corners. The mask is stretched under tension and attached to the frame at the frame attaching border while under tension.

REFERENCES:
patent: 4746315 (1988-05-01), Sumiyoshi
patent: 5616985 (1997-04-01), Hosotani

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