Cathode-ray tube having apertured mask

Details Cathode-ray tube having apertured mask Cathode-ray tube having apertured mask

1971-07-22

1978-08-22

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907, H01J 2932

Patent

active

041091779

ABSTRACT:
A cathode-ray tube with either a positive-or a negative tolerance viewing-screen structure comprises an evacuated envelope, a luminescent viewing screen within the envelope and means for exciting the screen to luminescence. The tube includes means, such as an apertured mask or a light-absorbing matrix, for selectively defining to the viewer an array of discrete excited areas in the screen which are noncircularly graded in size, with the largest areas in the central portion of the screen and the smallest areas in the peripheral portions of the screen.

REFERENCES:
patent: 2947899 (1960-08-01), Kaplan
patent: 3358175 (1967-12-01), Morrell et al.
patent: 3632339 (1972-01-01), Khan
patent: 3652895 (1972-03-01), Tsuneta et al.
patent: 3686525 (1972-08-01), Naruse et al.

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