Fresnel image floater

G - Physics – 03 – B

Patent

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Details

G03B 21/28 (2006.01) G02B 3/08 (2006.01) G02B 27/22 (2006.01)

Patent

CA 2399271

An image projection device includes a Fresnel lens (11) positioned in an optical path of an illuminated image (10) in such a way that light from the image passes twice through the Fresnel lens (11). A first optical element may be a planar mirror (13) arranged to reflect light transmitted by said Fresnel lens (11) in a first direction back through the Fresnel lens (11) in a second direction. A second optical element may be provided for changing a path of light exiting said Fresnel lens in the second direction so that the projected image appears at a location away from the path of light from the image source to the Fresnel lens.

L'invention concerne un dispositif de projection d'image, à lentille de Fresnel placée sur un trajet optique d'image illuminée (10), de manière à faire passer la lumière de l'image deux fois à travers la lentille de Fresnel (11), soit une fois dans chaque sens. Un premier élément optique peut être un miroir planaire (13) réfléchissant la lumière transmise par la lentille de Fresnel (11) dans une première direction puis de retour à travers ladite lentille (11) dans la deuxième direction. Un deuxième élément optique peut être prévu pour modifier le trajet lumineux sortant de la lentille dans la deuxième direction considérée, de sorte que l'image projetée apparaisse en un emplacement éloigné du trajet de la lumière entre une source de l'image et la lentille.

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