Optical diffuser for producing a circular light field

Optical: systems and elements – Diffusing of incident light

Reexamination Certificate

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C359S454000, C362S297000

Reexamination Certificate

active

07729054

ABSTRACT:
The optical diffuser has a transparent base body with a base body surface, which is divided into facets. Each facet has an elevation or a depression correlated or associated with a second curved surface. Respective facets have correspondingly different geometrical shapes. In some embodiments the respective apexes (S) of the elevations or depressions are arranged along a spiral, especially an Archimedean spiral. In other embodiments the apexes (S) are defined by coordinates (xs′, ys′) derived by rotation of coordinates (xp, yp) of all points (P), which are defined by an arrangement of facets with regular hexagonal edge contours, about a center (0, 0) through a twist angle (δ). Alternatively the apexes (S) are defined by coordinates (xs″, ys″) derived from coordinates (xp, yp) of all points (P), which are defined by the arrangement of facets with regular hexagonal edge contours, by random variations with the help of a Monte Carlo method. The optical diffuser according to the invention produces a circular soft-edged light field, which is outstanding for photographic applications.

REFERENCES:
patent: 4946252 (1990-08-01), Sugawara
patent: 5124839 (1992-06-01), Yamazaki et al.
patent: 5247390 (1993-09-01), Hed
patent: 6079854 (2000-06-01), Ra
patent: 6086227 (2000-07-01), O'Connell et al.
patent: 6778148 (2004-08-01), Pack
patent: 7443588 (2008-10-01), Becker et al.
patent: 2005/0185300 (2005-08-01), Kittelmann et al.
patent: 0 961 136 (1999-12-01), None
patent: 961 136 (1999-12-01), None

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