• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2006.04a
• /
• pp.68-69
• /
• 2006

Eye Glass Display(EGD)의 광학계를 소형, 경량화 하기 위하여 OLED 마이크로 패널과 프리즘 렌즈를 사용하여 설계하였다. 광학계 설계에 사용된 OLED 마이크로 패널은 0.59"크기의 SVGA($800{\times}600$)급이며, 크기는 0.59"이며, 렌즈는 프리즘 렌즈로 설계되었다. 설계된 프리즘 렌즈는 3연으로 구성되었으며, 각 면은 각각 비회전대칭 비구면으로 tilt와 decenter를 사용하여 광학적 성능을 향상시켰다. 설계된 프리즘 렌즈의 화각(FOV)은 $28^{\circ}$, 왜곡수차는 4% 이내이며, 광학계의 해상도를 나타내는 MTF는 공간주파수 30lp/mm에서 full field가 40%이상의 성능을 나타내었다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
• /
• 2009.05a
• /
• pp.182-185
• /
• 2009

조명용 광원으로써 LED의 사용이 늘어나고 있고, 앞으로도 더욱 늘어날 추세이다. 하지만 현재 출시되는 LED를 조명 용도에 적합한 배광을 구현하는 렌즈를 설계하는 작업은 설계 방법이 어렵고, 많은 반복 작업을 동반한다. 이에 새롭게 출시된 Photopia 3.0 Version의 PODT 기능을 이용해 LED 렌즈를 쉽게 설계할 수 있는 방법을 소개하고, 간단한 렌즈 설계를 수행 하였다.

• The Optical Journal
• /
• s.169
• /
• pp.29-32
• /
• 2017

• The Optical Journal
• /
• s.170
• /
• pp.28-32
• /
• 2017

• Journal of Korean Ophthalmic Optics Society
• /
• v.8 no.2
• /
• pp.99-103
• /
• 2003

This paper presents lens optimization of the resolution and the distortion for a four-element lens design. In order to have compact optical system, we used the tele-photo type lens composed of a positive and a negative power elements instead of retro-focus lens. The specifications of optical lens design are the focal length of 7.2 mm, the F/number of 2.8 and the field angle of $54.7^{\circ}C$. The MTF values are higher than 0.5 in the spatial frequency range up to 110 lp/mm for all of the designed object heights. Also, it is expected to fulfill all the requirements of a digital still camera lens and especially suited for building low-cost, compact digital cameras because of the low-profile property of the lens design.

• Korean Journal of Optics and Photonics
• /
• v.32 no.6
• /
• pp.259-265
• /
• 2021

Recently, lens manufacturing and assembly technology has greatly improved. However, tight requirements of manufacturing and assembly lead to an increase in cost and manufacturing time, and in some cases the performance of an optical system may deteriorate depending on the operating environment's conditions, such as temperature or vibration. In addition, the use of a compensator is an effective method to reduce sensitivity in an ultra-precision optical system, but in the case of a small lens, such as that in an endoscope, it is difficult to use a compensator due to the size limitation of the lens barrel. Therefore, minimizing lens sensitivity is the most important technology in lens design. For this reason, there have been various attempts to reduce the lens sensitivity, and there is a trend to add functions to reduce the sensitivity in the lens design S/W. In this paper, we introduce a design technology that minimizes lens sensitivity. We first design a lens with quite good performance, then analyze the sensitivity of this lens, make a multi-configuration with high-sensitivity element error, and then reoptimize it. We prove with an example that this design technique is very effective.

• Korean Journal of Optics and Photonics
• /
• v.34 no.6
• /
• pp.248-260
• /
• 2023

A 0.5-numerical-aperture (NA) refractive-reflective objective, composed of a low-NA refractive and a reflective focal reducer, is designed. A 0.25-NA Lister objective is used for the refractive. A two-spherical-mirror system, corrected for spherical aberration, coma, and astigmatism is used for the reflective focal reducer. In spite of high NA, the refractive-reflective objective has an 18-mm working distance and improved imaging performance, compared to the 0.25-NA Lister objective.

• Korean Journal of Optics and Photonics
• /
• v.7 no.4
• /
• pp.305-313
• /
• 1996

Lens design method by using equivalent lenses was already introduced, but the method has a limitaion that all lenses should be in the air. Therefore, we often get improper solution in designing cemented lenses. In this study, the lens conversion from thick lens to equivalent lens and its reversal was generalized without any preconditions, and the third order aberration fomulrae were derived for the generalized equivalent lens system. The generalized equivalent lens conversion were applied to typical cemented doublet and triplet, and they show that the third order aberrations of the generalized equivalent lenses have better agreements with their corresponding thick lenses than the previous conversion method.

• Korean Journal of Optics and Photonics
• /
• v.26 no.4
• /
• pp.217-225
• /
• 2015

This paper shows the best selection and combination of glass in lens design, to correct a chromatic aberration using achromatic and apochromatic conditions. Using this research result, we have designed a telecentric lens for machine vision in the full range of visible light. We obtain good optical quality in the form of a quite small RMS wavefront error of $0.057{\lambda}$ in the super-broadband wavelength range 380 nm -780 nm. This result is better than that for a common telecentric lens in the visible wavelength range 486.1-656.2 nm.

• Transactions of the KSME C: Technology and Education
• /
• v.1 no.1
• /
• pp.13-19
• /
• 2013

Ftheta Lens, whose image height is proportional to its field view angle, is one of the most important parts in Laser Scanning Unit(LSU). In this paper $f{\theta}$ lens design, mold production and modification method of lens design and mold are introduced. Lens design was carried out with Zemax and Special Toric surfaces were applied for lens surfaces to minimize distortion both in main and sub scanning directions. And a high precision machine with 1nm resolution was used to fabricate lens mold cores. After injection the lens was evaluated and the difference from design was examined. This difference was compensated by modifying lens design and new lens mold cores were made according to modified lens design to obtain the quality of original design.