To develop a geometric matching method for precision mold alignment
Journal
Proceedings of SPIE - The International Society for Optical Engineering
Journal Volume
9217
Date Issued
2014
Author(s)
Abstract
In order to develop a high accuracy optical alignment system for precision molding machine, a geometric matching method was developed in this paper. The alignment system includes 4 high magnification lenses, 4 CCD cameras and 4 LED light sources. In the precision molding machine, a bottom metal mold and a top glass mold are used to produce a micro lens. The two molds combination does not use any pin or alignment part. They only use the optical alignment system to alignment. In this optical alignment system, the off-axis alignment method was used. The alignment accuracy of the alignment system is about 0.5 μm. There are 2 cross marks on the top glass mold and 2 cross marks on the bottom metal mod. In this paper did not use edge detection to recognize the mask center because the mask easy wears when the combination times increased. Therefore, this paper develops a geometric matching method to recognize mask center. ? 2014 SPIE.
Subjects
CCD cameras
Edge detection
Geometry
Glass
Image processing
Light emitting diodes
Light sources
Metal molding
Microlenses
Molding
Molds
Optical data processing
Alignment accuracy
Alignment system
Automatic optical inspection
Geometric matching
High magnifications
Off-axis
Optical alignment systems
Precision molds
Alignment
Type
conference paper