• 오토저널
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• 제15권3호
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• pp.89-95
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• 1993

This paper presents the development of CAD system for the design of lens of the Turn Signal Lamp that can model and simulate its optical performance. The system consists of three main modules: skin surface modeling module, inner lens modeling module and optical performance simulation module. Skin surface geometry can be modeled by the input of data file and inner lens can be modeled by the input of only four parameter using its geometric characteristics. Also light distribution pattern, the barometer of optical performance is generated by means of finite ray tracing method. The system display modeled geometry, ray tracing and generated light distribution pattern.

• 한국광학회:학술대회논문집
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• 한국광학회 2007년도 동계학술발표회 논문집
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• pp.125-126
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• 2007

This paper discussed a method for estimating the distance using the stereo zoom lens module. A method for estimating the distance using single zoom lens is limited in convergence angle. So, we composed horizontal moving camera and estimated the distance. In the experiment, we get the wider convergence angle and more precise distance than single camera's.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 추계학술대회 논문집
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• pp.675-676
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• 2008

• Current Optics and Photonics
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• 제7권4호
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• pp.398-407
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• 2023

We explored a method to evaluate imaging performance for the optimal assembly of an endoscopic miniature lens and a sensor constituting an imaging module at the distal end of gastrointestinal endoscopy. For the assembly of the imaging module, the image sensor was precisely located at the focal plane when collimated light passed through the endoscopic lens. As another method, the distance between the lens and sensor was adjusted to obtain the highest focus index from images measured the star chart of the International Organization for Standardization (ISO) standard at various positions. We analyzed the slanted-edge modulation transfer function (MTF), corresponding depth of field, and number of line pairs for MTF 50% and 20% at each working distance within the range of 5-100 mm for imaging modules assembled in different ways. Assembly conditions of the imaging module with better MTF performance were defined for each working distance range of 5-30 mm and 30-100 mm, respectively. In addition to the MTF performance, the focus index of each assembled module was also compared. In summary, we examined the performance of imaging modules assembled with different methods within the suggested working distance and tried to establish the optimal assembly protocol.

• 한국광학회지
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• 제32권1호
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• pp.15-21
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• 2021

본 논문에서는 LED 광원 모듈과 시준용 프레넬 렌즈를 이용하여 항공기 장애등 광학 시스템을 설계하였다. 설계된 광학계는 국토 교통부 항공기 경고등의 수직 양각 중심 광도 20,000 cd와 발산각 광도 규격 조건을 만족시키기 위해 프레넬 렌즈를 모듈별로 설계하였다. 또한 LED 광원 모듈과 프레넬 렌즈의 위치와 기울기를 조정하여 광학 시스템을 최적화하였으며, 이렇게 설계된 광학계의 배광 특성을 분석하고 비교하여 최적의 성능을 가진 항공기 경고등 광학계를 설계하였다.

• 전기학회논문지P
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• 제61권2호
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• pp.97-102
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• 2012

CPV system in the desert areas or areas near the equator, as is suitable for high-temperature region. As compared to silicon solar cells, CPV system have a high proportion of a BOS (balance of system). Solar cells because of its low proportion when designing a module technology is applied in a variety of ways. Applied to the CPV system is classified into two kinds of optical technology. One of those using fresnel lens uses refraction of light energy. The other is a mirror reflection of the structure using sprays. Both of these two ways to condense the sun to collect solar cell is a form of light. And goals by using a small solar cell materials is to produce more energy. In this paper, suitable for a domestic environment, with the aim CPV Manufacturing Technology, built on a variety of modular process technology to the development of a prototype performance analysis was carried out. In particular, silicone coated on the glass by the method of implementation of the Fresnel lens SOG(Silicon on glass) by applying the lens to absorb the solar spectrum was broad. In addition to, for the analyze to characteristics of the CPV module, developed CPV module performance and generating characteristics studied. These related technology through research and development of high-performance multi-junction solar cells, modules, development of concentrating solar power systems to facilitate the growth of the market is considered to be.

• 대한기계학회논문집A
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• 제38권2호
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• pp.219-225
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• 2014

폰 카메라용 렌즈모듈을 구성하는 각 단렌즈의 방향성을 고려한 자동 조합시스템을 개발하였다. 먼저 유동해석을 통하여 렌즈모듈의 조합성 도출 영향인자인 복굴절과 사출성형 조건의 상관성 및 조립 방향성에 따른 수율의 관계를 조사 하였다. 하나의 조립모듈에서 렌즈와 스페이서의 한 세트를 조립하도록 설계하여 생산성 향상 및 장비크기를 최소화하여 기존 장비의 약 25 %정도로 축소가 가능하였다. 또한, 기구적인 정렬기구인 센터링 기구 및 배럴가이드 적용하여 추가적인 비전시스템 없이 사이클 타임의 단축이 가능하였다. 개발한 시스템은 모듈러 설계를 통하여 픽커 및 가이드 등 일부 부품만의 교체로 생산모듈 변경에 대응 가능하도록 하여 급변하는 시장변화 및 소량생산에도 적용 가능하도록 제작되었다.

• International Journal of Advanced Culture Technology
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• 제8권3호
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• pp.260-268
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• 2020

Currently, it is usually a 3D scanner processing method as a laser method. However, the laser method has a disadvantage of slow scanning speed and poor precision. Although optical scanners are used as a method to compensate for these shortcomings, optical scanners are closely related to the distance and precision of the object, and have the disadvantage of being expensive. In this paper, 3D scanner using variable focus lens-based structured light module with improved measurement precision was designed to be high performance, low price, and usable in industrial fields. To this end, designed a telecentric optical system based on a variable focus lens and connected to the telecentric mechanism of the step motor and lens to adjust the focus of the variable lens. Designed a connection structure with optimized scalability of hardware circuits that configures a stepper motor to form a system with a built-in processor. In addition, by applying an algorithm that can simultaneously acquire high-resolution texture image and depth information and apply image synthesis technology and GPU-based high-speed structured light processing technology, it is also stable for changes to external light. We will designed and implemented for further improving high measurement precision.

• 전기전자학회논문지
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• 제22권3호
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• pp.858-861
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• 2018

본 논문에서는 소형 $360^{\circ}$ 구강 스캐너 렌즈 모듈의 개발을 제안한다. 제안하는 소형 $360^{\circ}$ 구강 스캐너 렌즈 모듈은 소형 $360^{\circ}$ 고해상도(4MegaPixel) 렌즈 광학계, 15mm 이미지 센서부, 소형 $360^{\circ}$ 구강 스캐너 렌즈 외형 등으로 구성된다. 소형 $360^{\circ}$ 고해상도 렌즈 광학계는 총 9매의 렌즈로 어린이부터 성년까지 전 연령에 걸쳐 사용이 가능하도록 렌즈 외경을 15mm 이하로 제작한다. 소형 $360^{\circ}$ 고해상도 렌즈 광학계에 의해 입사되는 빛을 $90^{\circ}$ 굴곡을 시켜 이미지 센서에 영상 이미지를 전달하게 한다. 15mm 이미지 센서부는 이미지 센서의 열, 행 주소를 통해 이미지 배열을 거친 후 전압으로 변환된 값을 임베디드 보드의 ISP(Image Signal Processor)에 전송한다. 소형 $360^{\circ}$ 구강 스캐너 렌즈 외형은 개발된 렌즈의 고정을 위하여 경통을 설계하였다. 제안된 소형 $360^{\circ}$ 구강 스캐너 렌즈 모듈의 성능을 평가하기 위하여 공인시험기관에서 실험한 결과, $360^{\circ}$ 렌즈 광학계 분해능은 150cycles/mm에서 30% 이상, $360^{\circ}$ 렌즈 화각은 수평은 $360^{\circ}$, 수직은 $42^{\circ}{\sim}85^{\circ}$, 렌즈 왜곡률은 5% 이하의 세계최고 수준과 동일한 결과를 산출하였다.

• 한국정밀공학회지
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• 제27권12호
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• pp.28-32
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• 2010

Technical demands for aspheric glass lens formed in market increases its application from simple camera lens module to fiber optics connection module in optical engineering. WC is often used as a metal core of the aspheric glass lens, but the long life time is issued because it fabricated in high temperature and high pressure environment. High hard thin film coating of lens core increases the core life time critically. Diamond Like Carbon(DLC) thin film coating shows very high hardness and low surface roughness, i.e. low friction between a glass lens and a metal core, and thus draw interests from an optical manufacturing industry. In addition, DLC thin film coating can removed by etching process and deposit the film again, which makes the core renewable. In this study, DLC films were deposited on the SiC ceramic core. The process variable in FVA(Filtered Vacuum Arc) method was the substrate bias-voltage. Deposited thin film was evaluated by raman spectroscopy, AFM and nano indenter and measured its crystal structure, surface roughness, and hardness. After applying optimum thin film condition, the life time and crystal structure transition of DLC thin film was monitored.