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

1985-03-25

1989-03-07

Corbin, John K.

Optics: image projectors

Plural projection paths with single light source

350412, 350450, 350473, 350477, 353 50, 353 67, 353 77, G02B 1318, G02B 912, G02B 934, G03B 2128

Patent

active

048100757

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: 2552672 (1951-05-01), Grey
patent: 2638034 (1953-05-01), Wreathall
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1982-09-01), Betensky
patent: 4526442 (1985-07-01), Betensky
patent: 4577935 (1986-03-01), Yamakawa et al.

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