Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1986-03-25
1988-12-27
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313408, H01J 2907, H01J 2932
Patent
active
047942991
ABSTRACT:
A planar tension mask is disclosed for use in a color cathode ray tube having a substantially flat faceplate. The shadow mask according to the invention has an aperture pattern characterized by the vertical pitch of the apertures being constant, but with the horizontal pitch of the apetures increasing outwardly from the mask center according to a function which is parabolic with horizontal displacement, and parabolic with vertical displacement. The horizontal pitch increase is isotropic in the sense that the increase in pitch is the sum of the horizontal displacement increase and the vertical displacement increase. A color cathode ray tube front assembly having such a shadow mask is also disclosed.
REFERENCES:
patent: 2755402 (1956-07-01), Morrell
patent: 2947899 (1960-08-01), Kaplan
patent: 3590303 (1971-06-01), Coleclough
patent: 3652895 (1972-03-01), Tsuneta et al.
patent: 3686525 (1972-08-01), Naruse et al.
patent: 3947718 (1976-03-01), van Lent
patent: 4370591 (1983-01-01), Satoh
patent: 4630212 (1987-01-01), Nakamura
patent: 4636683 (1987-01-01), Tokita et al.
Chiodi Wayne R.
Prazak, III Charles J.
Moore David K.
Wieder K.
Zenith Electronics Corporation
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