Projecting optical apparatus having no trapezoidal distortion

Details Projecting optical apparatus having no trapezoidal distortion Projecting optical apparatus having no trapezoidal distortion

1989-07-11

1990-12-04

Haroian, Harry N.

Optics: image projectors

Episcope

Reflector between lamp and screen

353 69, 353101, G03B 2100

Patent

active

049749587

ABSTRACT:
A projecting optical apparatus has a light source which is located above a document supporting plate to illuminate a document located on the document supporting plate. A projecting lens system is located above the document supporting plate to project an image of the document on a projection screen. A reflection mirror reflects the light transmitted through the projecting lens system toward the projection screen to make an image on the projection screen. The projecting lens system and the reflection mirror are incorporated in a projecting reflection unit, so that the projecting reflection unit is movable in directions substantially parallel with the plane of the document supporting plate.

REFERENCES:
patent: 3547530 (1970-12-01), Poole
patent: 4002408 (1977-01-01), Amma
patent: 4846570 (1989-07-01), Kanai

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