Projection apparatus

Details Projection apparatus Projection apparatus

1976-03-22

1977-11-29

Haroian, Harry N.

Optics: image projectors

Pointer

353 84, 353 88, 353 94, 35 102, G03B 2100, G03B 2126

Patent

active

040603180

ABSTRACT:
A projector for projecting a movable spot of light onto a screen includes a pair of plates mounted adjacent and parallel to each other, each plate being opaque, apart from a straight slot. The slots cross one another at a crossing point defining an aperture which is transparent to light from a light source. The plates are mounted to be independently movable in such a way that the aperture is selectively displaceable thereby to allow controlled movement of the spot on the screen.

REFERENCES:
patent: 2275631 (1942-03-01), Johnson
patent: 2412017 (1946-12-01), Taylor et al.
patent: 2950382 (1960-08-01), Hatch
patent: 3016791 (1962-01-01), Inwagen
patent: 3195402 (1965-07-01), Hamilton
patent: 3545361 (1970-12-01), Brandt
patent: 3642360 (1972-02-01), Ataka
patent: 3658414 (1972-04-01), Fukushima
patent: 3846008 (1974-11-01), Sobajima et al.

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