• Journal of Korean Ophthalmic Optics Society
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• v.7 no.2
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• pp.113-121
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• 2002

Nowadays, developed camera, camcorder, CCTV and copier system accept a wide angle and a telephoto lens, and have an excellent capacity. Also, it is small as using aspheric surface. In this paper, after we evaluate and analyze two-group zoom lens system and three-group zoom lens system for camera, we refer to it, and design three-group zoom lens system for camera. Therefore, when we design a zoom lens system for camera, we use a symmetrical system. As using an aspheric surface, we can try to a miniaturization and an efficient improvement. We use optical valuable measure methods, a ray intercept plot, MTF and Seidel coefficient. So, we can confirm to have a similar level to compare with reference model.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.197-197
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• 2004

일반적으로 가공기는 주로 직선 운동 축과 회전 운동 축으로 구성되어 있으며, 여러 개의 축의 조합에 의하여 원하는 경로를 얻어내게 된다 여러 축이 조합이 되더라도 대부분 가공 동작의 경우는 하나의 축에 의한 단축 운동으로 충분히 만족할 만한 결과를 얻을 수 있다. 그러나, 금형 가공이나 렌즈가공 등은 단순한 회전이나 직선의 조합에 의한 곡선이 아닌 임의의 함수에 의한 곡선이므로 이러한 경우 2축 이상을 적절히 이동시켜서 원하는 형상을 얻어야 한다.(중략)

• Transactions of the Korean Society of Machine Tool Engineers
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• v.16 no.6
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• pp.175-180
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• 2007

In this paper, an aberration free aspherical lens is designed and machined by new design method and the spherical aberration measuring system is developed. It confirmed the propriety of new design method by measuring optical characteristics of machined lens with the new measuring system. The system could measure a spherical aberration quantitatively by using CCD camera, laser, collimator and so on.

• Optical Science and Technology
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• v.8 no.2
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• pp.14-21
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• 2004

캠코더, 빔 프로젝터, 대형 프로젝션 TV, CD-ROM 드라이버, DVD Player, 레이저 프린터 등의 많은 광학 제품들이 대중화되어 일반 소비자에게 널리 판매되고 있다. 제품 및 서비스의 디지털화에 부합하여 이들 광학 제품의 시장 규모와 중요성은 점점 커지고 있다. 본 기사에서는 최근 광학제품의 핵심부품으로서 널리 이용되고 있는 비구면 렌즈의 제조 과정에서 CAD/CAM 응용기술이 어떻게 활용될 수 있는 지를 살펴보고자 한다. CAD/CAM이란 Computer Aided Design과 Computer-Aided Manufacturing의 약어로써 제품의 설계와 제조 과정에서 컴퓨터를 활용하는 기술을 의미한다.(중략)

• Journal of Korean Ophthalmic Optics Society
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• v.12 no.3
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• pp.27-33
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• 2007

This research investigated the effects of spherical and aspherical R.G.P lenses which was performed by optometrists in In-Cheon and Kyung-Gi region. This research survey included various questions such as the fitting status, after-care method, preliminary test. Results of the survey revealed that the optometriests sold the asperical and spherical lenses with a ratio of 7:3, respectively, and most of them did not cheked Topography, Fluorescein test by slit lamp biomicroscope, Tear Break up time test, Schirmer test and so on. And, with fitted R.G.P lenses symptoms like light odd-feeling, congestion, eye-stimulus, dimness and dryness were frequently reported. The purposes of this study are to search for the ideal fitting check of R.G.P lens and remind the most important preliminary test for contact lens fitting.

• Proceedings of the KSME Conference
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• 2003.04a
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• pp.992-997
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• 2003

Aspherical lens design method named ray reverse tracing method is introduced. Differently from the traditional design method, the ray reverse tracing method traces the shape and location of a real object by use of its virtual image. From the result, it was convinced that spherical aberration free aspherical lens could be designed by use of the ray reverse tracing method. Furthermore, it could reduce the degree of dependence of optical characteristics on designer's ability, because deformation terms and optimization can be eliminated, which has been performed in conventional lens design process.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2001.04a
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• pp.964-967
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• 2001

Aspherical lens with the higher numerical aperture has been needed in the optical storage device to increase the recording density on the disk. However, high numerical aperture means the large slope angle at the clear aperture of the lens. Therefore, the measurement and manufacturing technique including the lens molding process for the slope angle should be developed. In this paper, the evaluation technique was described for the optical performance of the aspherical lens. Aspherical form error brings about the wavefront error and the side lobe of the beam intensity profile. A schematic diagram of the aspherical lens manufacturing was drawn to explain the aspherical form error compensation. Finally, form error of the aspherical lens was defined and plotted using the raw data of the Formtalysurf.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.06a
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• pp.806-809
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• 2003

In this paper, extracting design information from arbitrary aspherical lens shape in reverse engineering is introduced. Deformation terms and sphere data equation with various variables compose asphere equation. Aspherical lens shape is expressed with complicated polynomial expression that includes deformation terms and sphere data. Deformation term and vertex curvature have direct influence on a geometric shape and an optical characteristics of aspherical lens. Hence, extracting these information mean that design information could be derived and analyzed from shape data of arbitrary aspherical lens. Furthermore, sharing designer's experience and knowledge for aspherical lens design could be expected.

• Journal of the Korean Society for Precision Engineering
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• v.22 no.10 s.175
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• pp.144-149
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• 2005

This study presents the method of extracting shape design data on any aspheric lens by reverse engineering. The design formula fur aspheric lenses is needed in almost all of the design, manufacture and measuring processes. The difficulty in designing the lens lies in the fact that it uses a complex formula for the aspheric surface, and many of the preliminary design values must be selected before actually inserting them into the formula. If the values could be extracted from an aspheric lens for which the structural design information is unknown and used in designing other lenses of similar characteristics, the difficulties in designing and measuring aspheric lens could be reduced. Therefore, in this study, the concept of reverse engineering was applied to demonstrate the method of extracting shape design information of aspheric lens from an arbitrary aspheric lens.

• Journal of the Korean Society for Precision Engineering
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• v.20 no.10
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• pp.191-198
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• 2003

In this study, aberration free aspherical lens design method named ray reverse tracing method is introduced. Differently from the traditional design method, the ray reverse tracing method traces the shape and location of a real object by use of its virtual image. From the result, especially spherical aberration free aspherical lens could be designed by use of the ray reverse tracing method. Furthermore, it could reduce the degree of dependence of optical characteristics on designer's ability, because deformation terms and optimization can be eliminated, which has been performed in conventional lens design process.