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
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United States of America Patent
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Mar 7, 2017
Grant Date -
Feb 12, 2015
app pub date -
Aug 12, 2014
filing date -
Aug 12, 2013
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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.
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