Device for correcting distortion of a projected image

Details Device for correcting distortion of a projected image Device for correcting distortion of a projected image

1976-11-08

1978-05-16

Haroian, Harry N.

Optics: image projectors

Distortion compensation

For projection axis inclined to screen

353DIG3, B03B 2100

Patent

active

040895998

ABSTRACT:
In an over-head projector or a slide projector, a positive or negative lens is provided immediately in front of a transparency in the projector. The lens is normally perpendicular to the optical axis of the projection lens, and is inclined to an oblique angle with respect to the optical axis when the image projected on a projection screen is distorted owing to oblique projection of the image on the screen.

REFERENCES:
patent: 1283676 (1918-11-01), Comstock et al.
patent: 2354614 (1944-07-01), Reason
patent: 2795996 (1957-06-01), Sauer
patent: 3253505 (1966-05-01), Miller
patent: 4002408 (1977-01-01), Amma

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