Shadow mask frame assembly for color cathode ray tube

Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield

Patent

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Details

313402, H01J 2907

Patent

active

060641460

ABSTRACT:
A shadow mask frame assembly for a color cathode ray tube including a plate shaped shadow mask (60) including electron beam passing holes (H) and having a curvature, and a frame (70) having a side wall (73), a flange (72) inwardly extending from the side wall (73), and a supporting portion (71) extending from the flange (72) as a step, wherein some peripheral edges (61) of the shadow mask (60) are attached to the supporting portion (71) and some peripheral edges (61) of the shadow mask (60) are not attached to the supporting portion (71) and slip on an upper surface of the supporting portion (71) during thermal expansion of the shadow mask (60). The present shadow mask frame assembly can be easily fabricated and assembled by eliminating the skirt portion, and can effectively compensate for thermal expansion of the mask plate.

REFERENCES:
patent: 4056755 (1977-11-01), Sohn
patent: 4599533 (1986-07-01), Ragland, Jr.
patent: 4712041 (1987-12-01), Greiner et al.
patent: 5416380 (1995-05-01), Horiuchi
patent: 5929558 (1999-07-01), Lee

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