Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1982-01-04
1983-11-22
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
358237, H04N 931
Patent
active
044172737
ABSTRACT:
A portable video image projection system is disclosed. The system is of the type which processes a video signal representative of a video image so as to provide a processed video signal, and includes at least one optical projection device responsive to the processed video signal for forming and projecting an image-forming beam of light along an optical axis so as to provide the video image on a substantially vertical viewing surface at a focal plane spaced a predetermined distance from the system along the axis. The system further comprises (1) a cabinet for supporting the projection device so as to project initially the image-forming beam in a substantially upward direction through an upper, open portion of the cabinet, and (2) a top including a specularly light reflective surface disposed to face the projection device. The top is dimensioned and movable between a first position wherein the top serves as a closure for the upper portion of said cabinet, and a second position wherein the light reflective surface is disposed to fold the optical axis so as to reflect the beam in a substantially horizontal direction.
In accordance with another aspect of the invention an improved portable video image projection system is provided by a video image projection system of the type which projects a focussed image onto a light reflective surface for viewing the image, wherein the system further comprises a positioning device, supported by the system, for setting the position of the projection means relative to the light reflective surface so that the focussed image is congruent with the surface. The positioning device provides a first pair of directional light beams intersecting at a first intersection point at a fixed distance from the system and in the focal plane of the focussed image, and a second pair of directional light beams intersecting at a second point at the fixed distance and in the focal plane.
REFERENCES:
patent: 2287307 (1942-06-01), Herbst
patent: 4358792 (1982-11-01), Domoleczny et al.
Kloss Video Corporation
Murray Richard
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