Composite apparatus for the direct projection and overhead or ba

Details Composite apparatus for the direct projection and overhead or ba Composite apparatus for the direct projection and overhead or ba

1984-09-25

1986-02-25

Haroian, Harry N.

Optics: image projectors

Selective projection on distant or cabinet screen

353 79, G03B 2130

Patent

active

045726329

ABSTRACT:
A composite apparatus for the direct projection and overhead or back-projection of slides comprises a box containing a source of light with a projection lens, an overhead or back-projection screen and a mirror for reflecting, towards this overhead or back-projection screen, the light beam issuing from the lens.
The means ensuring the displacement of the mirror likewise provoke a displacement to take the mirror outside the box at a distance from the lens which is a function of the focal distance thereof and which is greater than that at which the mirror lies in the case of direct projection. The overhead or back-projection screen is articulated on the upper face of the box, about a horizontal, transverse pin, so as to be able to be opened into a position inclined upwardly and forwardly, to receive the light beam reflected upwardly and rearwardly by the mirror.

REFERENCES:
patent: 1447403 (1923-03-01), Atherton
patent: 2095171 (1937-10-01), Cook
patent: 2299657 (1942-10-01), Rystedt
patent: 2769368 (1956-11-01), Bearint
patent: 3834798 (1974-09-01), Bundschuh
patent: 3885868 (1975-05-01), Hadzinihalis
patent: 4003644 (1977-01-01), Aruanno
patent: 4163610 (1979-08-01), Sanderson

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