Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1998-05-12
2000-03-14
Patel, Ashok
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313407, H01J 2907
Patent
active
060377097
ABSTRACT:
A cathode ray tube includes a panel having a substantially rectangular effective surface and a substantially rectangular skirt portion standing on the periphery of the effective surface, a shadow mask having a substantially rectangular mask body and a mask frame supporting the mask body and opposed to the skirt portion, and a holder provided between the skirt portion of the panel and the mask frame of the shadow mask and elastically suspending the mask frame to the panel. The holder comprises a first member having an engagement portion engaged with a stud pin attached on the skirt portion, and a second member having a fixing portion fixed to the mask frame. The plate-thickness of the first member is smaller than that of the second member, and the length of a first slanting portion of the first member is smaller than the length of a second slanting portion of the second member. With use of this holder, a color drift caused by an external impact undesirably applied to the cathode ray tube and a color drift caused by a thermal expansion of the mask frame during operation for a long time can simultaneously be corrected and an image of excellent quality can be displayed stably.
REFERENCES:
patent: 3999098 (1976-12-01), Dougherty
patent: 4652792 (1987-03-01), Tokita et al.
patent: 4827180 (1989-05-01), Sone et al.
patent: 4916357 (1990-04-01), Nakamura et al.
patent: 5012154 (1991-04-01), Ragland, Jr.
patent: 5210459 (1993-05-01), Lee
patent: 5502349 (1996-03-01), Seo
Nakagawa Shinichiro
Shimizu Norio
Kabushiki Kaisha Toshiba
Patel Ashok
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