Title:
METHOD FOR SUPPRESSING DOMING EFFECT OF COLOR DISPLAY TUBE AND COLOR DISPLAY TUBE FORMED BY THE METHOD
Document Type and Number:
Japanese Patent JPS62256339
Kind Code:
A
Abstract:
Anti-doming measures taken in colour display tubes normally comprise applying radiation absorptive layers to the back of the screen. In contrast, in the present invention the thermal radiation reflectivity between the upright edge of the faceplate and at least the edge portion of the shadow mask is adjusted to obtain a desired temperature stabilisation level which avoids spot misalignment. This may be achieved by having selected areas of the upright edge non-aluminised whilst the remainder of the upright edge together with the back of the screen have a layer of aluminium thereon. The size and/or shape and/or disposition of the selected areas is/are chosen to obtain an optimum ratio of aluminised and non-aluminised glass surface which will provide a desired radiation coefficient. Typically at least 35% of the upright edge is aluminised. In certain situations it may be necessary to apply a material having a high radiation coefficient, such as a low melting point glass with a high lead content, to a peripheral portion of the shadow mask and the adjoining mounting frame. Measures may also be taken to counter local doming.
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Inventors:
YOHANESU MARIA AZARINA ANTONIU
Application Number:
JP9635487A
Publication Date:
November 09, 1987
Filing Date:
April 21, 1987
Export Citation:
Assignee:
PHILIPS NV
International Classes:
G03B27/46; H01J29/07; H01J29/28; (IPC1-7): H01J9/14; H01J9/20; H01J9/22; H01J29/07; H01J29/28; H01J29/88
Domestic Patent References:
| JPS5715343A | 1982-01-26 | |||
| JPS54151371A | 1979-11-28 | |||
| JPS62119834A | 1987-06-01 |
Attorney, Agent or Firm:
Akihide Sugimura