Low-glare overhead projector

Details Low-glare overhead projector Low-glare overhead projector

G - Physics

03

B

240/74, 88/46.5

G03B 21/132 (2006.01)

Patent

CA 1040466

ABSTRACT OF THE DISCLOSURE An overhead projector is disclosed which has in optical alignment a light source, a transparent surface on which a transparency is laid for pro- jection, and echelon lens structure located between the light source and the surface, and a projection lens for focusing an image of the transparency onto a projection screen. The echelon lens structure comprises at least two linear echelon lenses which are oriented so that their cylinder axes are crossed at an angle greater than 0° and so that the lens structure achieves focusing of an image of the light source, whereby a user of the projector is not disturbed by "propeller"-type concentrated glare emanating from the lens structure.

233783

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