Patent · US Expired

Optical lens soft-focus effect

US7139133B2 · kind B2 · utility

3Cited by

5References

9Claims

0Family size

Assignee

Schott AG · DE

Inventors

Ralf Bonitz · Stadecken-Elsheim, DE
Ralf Biertuempel · Mainz, DE
Wolfgang Semar · Mainz, DE
Matthias Redey · Spiesheim, DE

Key dates

Filing date	May 6, 2003
Grant date	Nov 21, 2006
Priority date	—
Expiry date	May 6, 2023

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF21V5/002
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The optical lens, especially for a motor vehicle, is provided with a soft-focus effect, e.g. to soften a light-dark boundary on an illuminated surface. For this purpose the optical lens has an optically active surface (5′) provided with an embossed fine structure (2) extending radially outward in a direction from an optical axis (O) toward an outer periphery (P) in an undulating form and an embossed microstructure (3) superimposed on the embossed fine structure (2). The fine structure (2) has a roughness that is greater than that of the microstructure (3). The fine structure (2) preferably has a roughness of from 1 μm to 10 μm and the microstructure (3) has a roughness (h) in a range of from 0.1 μm to 2.5 μm.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.