Device for distributing light on an image frame

Details Device for distributing light on an image frame Device for distributing light on an image frame

G - Physics

03

B

G03B 21/14 (2006.01) G03B 21/20 (2006.01)

Patent

CA 2251023

A device uses a divergent lens (7) having a concave surface with a central region (12) and a peripheral region (13) of lower curvature than the central region. The light beam (16) crossing the central region is spread over the entire surface of the image frame (10), thereby avoiding a concentration of light in the central portion thereof, and ensuring a more uniform illumination. The device is useful for large size slide projectors using a xenon arc lamp.

Le dispositif utilise une lentille divergente (7) dont une face concave présente une région centrale (12) et une région périphérique. (13) de plus faible courbure que la région centrale. Le faisceau lumineux (16) traversant la région centrale est étalé sur toute la surface du support d'image (10), ce qui évite une concentration de lumière dans la partie centrale de celui-ci et fournit par conséquent un éclairement plus homogène. Application aux projecteurs de diapositives de grand format utilisant une lampe à arc au xénon.

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