Electric lamp and discharge devices – Cathode ray tube – Envelope
Patent
1995-06-05
1996-04-09
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Envelope
H01J 3100
Patent
active
055064701
ABSTRACT:
A color cathode ray tube includes a face plate having a curved inner surface and a substantially rectangular effective area. A phosphor screen is formed on the inner surface of the face plate, and a shadow mask is arranged to oppose the phosphor screen. The effective area is formed such that, in an area of the effective area which is away from the center of the effective area by 1/2 or more of a distance between the center of the effective area and an axial end portion of the effective area in the major axis, a difference between the thickness of the face plate at a point which is on the minor axis and located away from the center of the effective area by a predetermined distance and the thickness of the face plate at a point which is on the diagonal axis and located away from the center of the effective area by the predetermined distance is smaller than a difference between the thickness of the face plate at the point on the diagonal axis and the thickness of the face plate at a point which is on the major axis and located away from the center of the effective area by the predetermined distance.
REFERENCES:
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patent: 4631441 (1986-12-01), Morrell et al.
patent: 4677339 (1987-06-01), Inoue et al.
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Patent Abstracts of Japan, vol. 013, No. 416 (E-831) 14 Sep. 1989 & JP-A-01 154 443 (Toshiba) 16 Jun. 1989.
Inoue Masatsugu
Takahashi Tohru
Kabushiki Kaisha Toshiba
Richardson Lawrence O.
Yusko Donald J.
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