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20 May 2009 Precision compression molding process of low Tg glass aspheric lenses
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Proceedings Volume 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 728205 (2009) https://doi.org/10.1117/12.830783
Event: AOMATT 2008 - 4th International Symposium on Advanced Optical Manufacturing, 2008, Chengdu, Chengdu, China
Abstract
Precision Glass Molding Process is adopted for mass production of aspheric lenses, micro-lens array, diffractive optical elements and free-form lenses which are difficult to be manufactured by using conventional methods. In this research, high order aspheric lenses with 6th item are molded using the glass material P-SK57 which is characterized by a low glass transition temperature (Tg) 493°C and thermal expansion coefficient (TEC) 8.9×10-6. Some of the molding conditions are as follow: 1) the molding temperature is 565°C, 2) the pressure force is kept at 4KN for 90 seconds and 3) the lens is cooling at an annealing velocity of 1.5~2°C /s to a release temperature of 180°C. The total molding cycle time is about 16 minutes. Molded aspheric lenses are measured with a Taylorsurf contact profilometer and a Zygo Newview white-light interferometer. As a result, the shape accuracy of molded lenses is less than 0.5um (PV) and surface finish quality is less than 2nm.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tao Ma and Jingchi Yu "Precision compression molding process of low Tg glass aspheric lenses", Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 728205 (20 May 2009); https://doi.org/10.1117/12.830783
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