Image-projection system

Details Image-projection system Image-projection system

1973-12-12

1976-04-06

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

315370, H04N 316

Patent

active

039491676

ABSTRACT:
An image projection system having an image projector and a concave viewing screen, in which the image projector comprises a cathode raytube, a horizontal and a vertical deflecting coil for beam scanning in the cathode ray tube, and a projection lens, and the amplitude of scanning currents supplied to the horizontal and the vertical deflecting coil is controlled in vertical and horizontal scanning periods respectively, so that trapezoid-shaped and fan-shaped distortions in the projected image on the viewing screen are compensated for.

REFERENCES:
patent: 2176973 (1939-10-01), Bowman-Manifold
patent: 2344736 (1944-04-01), Schade
patent: 2661443 (1953-12-01), Smith
patent: 2999126 (1961-09-01), Harries et al.
patent: 3329861 (1967-07-01), Barkow et al.
patent: 3469026 (1969-09-01), Winik et al.
patent: 3700958 (1972-10-01), Haferl
patent: 3710171 (1973-01-01), Rhee
patent: 3723805 (1973-03-01), Scarpino et al.
patent: 3836926 (1974-09-01), Seitz et al.

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