Rhenium-iridium coating effect of tungsten carbide mold for aspheric glass lens |
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Authors: | Hyun-Uk Kim Du-Hwan Cha Hye-Jeong Kim and Jeong-Ho Kim |
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Affiliation: | (1) Materials Fabrication Laboratory, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama Japan, 351-0198;(2) Ultra Precision Optical Team, Korea Photonics Technology Institute, 971-35, Wolchul-dong, Buk-gu, Gwangju, South Korea, 500-779 |
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Abstract: | Recently, with increasing lightness and miniaturization of high resolution camera phones, the demand for aspheric glass lens
has increased because plastic and spherical lenses are unable to satisfy the required performance. An aspheric glass lens
is fabricated by high temperature and pressure molding using a tungsten carbide molding core; so precision grinding and coating
technology for the molding core surface is required. In this paper, Aspheric glass lens for 5 megapixel 4 time zoom camera
phone modules was developed. The grinding condition of the tungsten carbide molding core was found after applying design of
experiments (DOE). Also, the ultra-precision grinding process was investigated under this condition by experiment. Rhenium-iridium
(Re-Ir) coating was applied on the ground surface of the tungsten carbide molding core. The influence of Re-Ir coating was
compared and evaluated. The surface roughness of the molding core were improved by application of Re-Ir coating on the surface
of the tungsten carbide molding core. Aspheric lenses were also molded with the non-coated molding core and the Re-Ir coated
molding core. The surface roughness of the aspheric glass lens improved by about 0.4 nm (aspheric surface) and 0.5 nm (plane
surface). |
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Keywords: | Aspheric glass lens Tungsten carbide(WC) Rhenium-Iridium(Re-Ir) Glass molding process(GMP) |
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