• Title/Summary/Keyword: aspherical glass lens

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A Study on the Molding Process of an Optical Communication Aspherical Glass Lens Using the Weight Molding Method (광통신용 비구면 글라스 렌즈 자중성형 공정 연구)

  • Ryu, Sang;Roh, Kyung Hwan;Choi, Kwang Hyeon;Kim, Won Guk;Lee, Won Kyung;Kim, Do Hee;Yang, Kuk Hyeon
    • Ceramist
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    • v.21 no.4
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    • pp.427-432
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    • 2018

  • In this study, the aspherical lens for optical communications produced not with an one-step pneumatic type of external pressurization system (existed GMP process) but a constant weight of self-loaded mold put up to upper core. So the lens is molding with self-loaded weight molding and it calls Weight Molding process. In self-loaded molding process, we measured changes of center thickness molding lenses with each variable molding temperatures and time to find the effect of center of lens thickness to search key factors. As experimental results, the center thickness reach to targeted lenses step time value was changed drastically and it depends by molding temperature. If the molding temperature gets higher, the targeted lens that is reaching to the center thickness step time value was decreased. To find the effect of life improvement on mold core by imposing the self-loaded molding process we molded with GMP(Glass molding press) method and self-loaded molding method for 9,000 times and measured the lenses shape accuracy and surface roughness to evaluate the core life. As a result the self-loaded molding method core has 2,000 times longer that GMP (Glass molding press) method. If we adopt self-loaded molding method of the optical aspherical lens molding in the future, we expect that it would reduce the expense of changing the molds by molding core life improvements.

  • https://doi.org/10.31613/ceramist.2018.21.3.05 인용 PDF KSCI

A Basic Study of High Precision Spindle Design for Micro-Glass Lens Grinding (마이크로 렌즈 연삭기용 주축설계 및 제작에 관한 기초연구)

  • 김의중;한정훈;박상일;송승훈
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.57-60
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    • 2002

  • The high precision spindle is essential fer mass and low cost production of aspherical glass lens. Especially, in the grinding process of micro glass lens the performance of the spindle determine the machined surface quality. For the aspheric micro glass lens grinding, we design and make a high precision spindle. We use air bearings for high speed and low motion errors of the spindle. And the driving mechanism is an air turbine to remove heat generation. In this study, we make basic performance requirements of the spindle through benchmarking. And we confirm the requirements by basic machining test. We test air consumption, static stiffness, run-out and vibration of the spindle.

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Study on Ultra-Precision Grinding Processing for Aspheric Glass Array Lens WC Core (비구면 유리 어레이 렌즈 성형용 초경합금 코어 초정밀 연삭 가공에 관한 연구)

  • Ko, Myeong Jin;Park, Soon Sub
    • Journal of the Korean Society for Precision Engineering
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    • v.33 no.11
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    • pp.893-898
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    • 2016

  • Plastic array lens are cheap to manufacture; however, plastic is not resistant to high temperatures and moisture. Optical glass represents a better solution but is a more-expensive alternative. Glass array lens can be produced using lithography or precision-molding techniques. The lithography process is commonly used, for instance, in the semiconductor industry; however, the manufacturing costs are high, the processing time is quite long, and spherical aberration is a problem. To obtain high-order aspherical shapes, mold-core manufacturing is conducted through ultra-precision grinding machining. In this paper, a $4{\times}1$ mold core was manufactured using an ultra-precision machine with a jig for the injection molding of an aspherical array lens. The machined mold core was measured using the Form TalySurf PGI 2+ contact-stylus profilometer. The measurement data of the mold core are suitable for the design criterion of below 0.5 um.

  • https://doi.org/10.7736/KSPE.2016.33.11.893 인용 PDF KSCI

A study of glass molding the micro Blu-ray pick-up lens (초소형 블루레이 광 팍업 렌즈의 유리 성형에 관한 연구)

  • Park, S.S.;Lee, K.Y.;Kim, H.M.;Hwang, Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.164-167
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    • 2006

  • Micro lens especially for optical pick up(Blu-ray) lens module is one of the key products for IT technology. Specific attention has been given to manufacturing of large radius lens but little to small radius less than 2mm diameter with N.A>0.8. This paper deals with a high precision glass molding technology for mass production of Blu-ray pick up lens. Ultra precisely machined tungsten carbide core and glass molding equipments are utilized for forming process. Evaluation was performed in terms of profile accuracy, surface roughness and thickness of fabricated glass lens.

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Study on Optimal Grinding Condition of Tungsten Carbide(Co 0.5%) using DOE (DOE를 적용한 WC(Co 0.5%)의 최적 연삭가공조건 연구)

  • Kim H.U.;Jeong S.H.;Cha D.H.;Ahn J.H.;Kim S.S.;Kim H.J.;Kim J.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.221-222
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    • 2006

  • In recent years, the demands of the aspherical glass lenses increase since it is difficult to obtain the desirable performance in the plastic lens. Glass lens is manufactured by the forming with high precision mold core. This paper presents the analysis of optimal grinding condition of tungsten carbide(WC, Co0.5%) using design of experiments(DOE). The process parameters are turbin spindle, work spindle, feedrate and depth of cut. The experiments results are evaluated by MINITAB software.

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