Abstract
Generally, aspheric glass lenses are manufactured using a glass molding press (GMP) method and a tungsten carbide mold core. This study analyzes the thermal deformation that occurs during the GMP process, and the results were applied to compensate an aspheric glass lens. After the compensation process, the form accuracy of aspheric glass lenses improved from ∼3.7 to ∼0.35 μm. The compensated lens complied with the actual specifications. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or repro- duction of this work in whole or in part requires full attribution of the original publication, including its DOI. (DOI: 10.1117/1.OE.53.6.065106)
Highlights
Due to the tremendous growth in media technology in recent times, the demand for ultraprecision optical components[1,2] has increased rapidly
A sag value Zn of compensation in the aspheric equation was obtained by adding the spherical term Zsp of the designed lens and the aspheric coefficient Za, which is the sum of the aspheric term of the designed aspheric surface and the compensation aspheric term Zcom that represents the thermal deformation
The thermal deformation phenomenon that occurs during the molding of aspheric glass lenses was analyzed for aspheric glass lenses used in circuit televisions (CCTVs)
Summary
Due to the tremendous growth in media technology in recent times, the demand for ultraprecision optical components[1,2] has increased rapidly. Aspheric glass lenses, produced using the GMP method, are molded by treating them by a process in which they are subjected sequentially to heating, pressing, and cooling. This leads to thermal deformation of the lenses, especially in the cooling process. The thermal deformation of aspheric glass lenses during the cooling process in the GMP technique was analyzed and the results were applied to the ultraprecision grinding of the mold core in order to improve the performance of lenses used in closed-circuit televisions (CCTVs)
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