Cathode-ray tube picture projection apparatus

Details Cathode-ray tube picture projection apparatus Cathode-ray tube picture projection apparatus

1974-09-13

1976-09-14

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

With cathode ray tube for light source

178 785, 355 52, G03B 2776, G03B 2778, G03B 2768, H01J 2989

Patent

active

039804054

ABSTRACT:
To prevent a picture of cathode-ray tube, which picture is projected through an optical lens system from being imaged with a deformed shape on a flat plane because of the curved phosphor screen of cathode-ray tube, an optical lens system is provided having imaging characteristics such that the central portion of an image formed thereby is convex toward the optical lens system.

REFERENCES:
patent: 3194142 (1965-07-01), Black, Jr.
patent: 3227059 (1966-01-01), Craig
patent: 3608452 (1971-09-01), Conrad et al.
patent: 3800085 (1974-03-01), Ambats et al.
patent: 3836926 (1974-09-01), Seitz et al.

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