Patent Number: 6,252,724

Title: Method for producing a fresnel lens on a catadioptric basis, and a fresnel lens produced using this method

Abstract: The invention relates to a method for producing a Fresnel lens having a staged entrance surface, reflecting surfaces and an exit surface. The entrance surface is subdivided into outer concentric stages and a central part. The central part is aspherically curved on an entrance side and plane on an exit side by satisfying the eikonal condition. Every stage has a top side, underside and outer side, top sides and undersides being of plane design, and the outer sides having curvatures appropriate for satisfying the eikonal condition.

Inventors: Scheer; Ulla (Wannweil, DE)

Assignee: aqua signal Aktiengesellschaft Spezialleuchfabrik

International Classification: G02B 17/08 (20060101); G02B 3/08 (20060101); G02B 003/00 ()

Expiration Date: 06/26/2018