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Flexible production of innovative optical elements
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The goal of the BMBF project FINO is to examine the necessary technological steps
for the production of innovative optical elements. The focus lies especially on the high
optical quality, which is necessary for the function, and the production's
economic process chain.
FORWISS is concentrating on the conversion of data of a given lens surface generated through
optical software into a NURBS surface graph using approbiate approximation algorithms. The production
of such optical elements requires a fast and precise CNC triggering of the given free formed surfaces.
The developed NURBS surface graphs have therefore additionally to suffice the CAD exchange format IGES.
Furthermore, quality assurance during the production of optical elements is an essential part of the
FINO project. In order to ensure this, new algorithms are developed, comparing the results of the
very precise 3D measurements with the CAD draft's original data. This is a prototypical pass problem.
Moreover, new methods respectively algorithms are needed for the processes injection moulding,
injection embossing, shiny pressing and precision thermoforming to transform the surface's calculated
outlines into the required surface graphs for the replication's form tools. The geometrically depending
thermic shrinkages of the different optical synthetics and glassware as well as the respective material's
different shaping temperatures are being taken into account during this process. Currently, the arithmetical
predetermination of the form tool's desired surface is not yet solved. So far, this surface form has been computed
in time consuming and therewith expensive iteration steps. An approximate approach is scheduled to maximize
the effectiveness.
In cooperation with LINOS, a topographical measurement method is being developed as well using
the recently finished lab gauge for the surface determination of the macro shape of rotation symmetric aspheres.
The lab gauge's functionality will be enhanced to handle free formed surfaces.
For information see
http://www.fino-optics.de/
Project staff
Project partners
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