Projection system with a cathode ray tube and a lens

Details Projection system with a cathode ray tube and a lens Projection system with a cathode ray tube and a lens

1988-11-30

1990-06-12

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Envelope

350432, 350436, 350450, 350477, 358 55, 358237, 358250, H01J 2989, G02B 1318

Patent

active

049335995

ABSTRACT:
A projection system comprising from the image end a screen, a lens in which a core portion including the lens axis accomplishes a convergence function and in which a peripheral portion including a lens edge thereof accomplishes the divergence function, a convex lens element, a concave lens element and a CRT having a face glass whose inner surface is coated with a phosphor and is so curved to form a fourth lens element with a curvature center within a core portion including the lens axis is disposed on the screen side of the projection system, the curvature radius of each part of the core portion of the fourth lens increasing thereof in accordance with increments of the semi-aperture distance of each part from the lens axis.

REFERENCES:
patent: 4573769 (1986-03-01), Clarke
patent: 4620773 (1986-11-01), Fukuda
patent: 4697892 (1987-10-01), Betensky
patent: 4810075 (1989-03-01), Fukuda

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