Method for calculating the surface area of optical lenses and projection lenses manufactured according to the method for use in a light module in a motor vehicle headlamp

US9588012B2 · kind B2 · utility

Assignee

• Automotive Lighting Reutlingen GmbH · DE

Inventors

• Steffen Wiersdorff · Reutlingen, DE
• Hermann Kellermann · Reutlingen, DE

Key dates

• Filing date: Aug 12, 2014
• Grant date: Mar 7, 2017
• Expiry date: May 9, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B27/0012
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method for calculating the surfaces of optical lenses including the steps of: providing a desired light distribution to be generated with light passing through the lens; deforming a first surface of the lens to generate light source images of different sizes; deforming a second surface of the lens to displace the light source images such that they lie at their highest point directly at or on a light/dark border in a resulting light distribution; determining a quality of the resulting light distribution by a comparison with the predefined light distribution; if the quality lies above a predefined limit value, storing the calculated surfaces for the lens; otherwise, renewed deformation of the first surface; renewed deformation of the second surface; repeating the previous two steps until the quality of the resulting light distribution lies above the limit value; and storing the calculated surfaces for the lens.