Chen C.-J.Chang C.-L.Jywe W.Wen-Yuh Jywe2022-05-242022-05-242014https://www.scopus.com/inward/record.uri?eid=2-s2.0-84922718554&doi=10.1117%2f12.2060633&partnerID=40&md5=752813ab903c8b06412a8394ac5aa05fhttps://scholars.lib.ntu.edu.tw/handle/123456789/611912In 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.CCD camerasEdge detectionGeometryGlassImage processingLight emitting diodesLight sourcesMetal moldingMicrolensesMoldingMoldsOptical data processingAlignment accuracyAlignment systemAutomatic optical inspectionGeometric matchingHigh magnificationsOff-axisOptical alignment systemsPrecision moldsAlignmentconference paper10.1117/12.20606332-s2.0-84922718554