Selection of Preform in Glass Molding Press of Aspherical Chalcogenide Lens

2nd International Conference on Frontiers of Materials Synthesis and Processing

Zhu, Yongjian^1 ; Wang, Mohang^1 ; Chen, Suifan^1 ; Cao, Sheng^1 ; Fan, Yufeng^1

Zhejiang University of Science and Technology, Hangzhou

310000, China^1

关键词: Aspherical lens;    Chalcogenide glass;    Convex surfaces;    Good yield rates;    Heating temperatures;    Mass production;    Molding parameters;    Spherical surface;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/493/1/012148/pdf
DOI  :  10.1088/1757-899X/493/1/012148

来源: IOP

【 摘 要 】

Glass molding press (GMP) is an effective method of mass production of glass lens, especially for chalcogenide glass lens. During the process of GMP, the preform is another key factor to achieve a good yield rate except the molding parameters. Three kinds of preforms are provided to conduct the molding experiment, which are made from the same material of chalcogenide glass. The first one is of the rough double-spherical surfaces, and the second one is turned by diamond cutting tools, and the last one is polished as smooth as possible. At the same conditions of 315°C heating temperature and maximum pressing force of 0.7MPa for 45s, only the polished preform can be pressed into a qualified aspherical lens, which has a shape accuracy of 0.875um and of 0.625um in peak-valley (PV) for concave and convex surface, respectively.