• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.212-212
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• 2004

휴대폰 등에 적용되는 초소형 카메라렌즈 모듈은 정밀 소형 조립체로써 고정밀도의 조립공정이 필요하다. 또한 해상도의 증가와 줌렌즈화 등에 따라 부품 종류가 다양해지고 부품 수도 급속히 증가하고 있다. 생산량 또한 급속히 증가하고 있어 생산공정의 자동화가 절실히 요구되고 있으나 제품의 종류가 다양하고 제품수명이 짧은 관계로 아직도 맡은 부분이 수 작업으로 이루어지고 있는 실정이다. 본 연구에서는 유연하고 확장 가능한 자동화 시스템을 적용하여 렌즈 조립시스템을 구성하고자 하였다.(중략)

• Transactions of the Korean Society of Mechanical Engineers A
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• v.38 no.2
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• pp.219-225
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• 2014

An automatic combination and assembly system for phone-camera lens modules was developed. The system enables the assembly of the relative orientation of the individual lenses making up the lens module. Conventional assembly systems assemble a lens module from eight assembly units. The developed system reduces this number to half by combining each lens and a spacer into a single assembly unit. Also, the number of transfer stages for sequential assembly is minimized without increasing the assembly time. Therefore, high productivity and a footprint that is only about 25 % of that of a conventional assembly system can be realized. The system features a modular design to allow it to cope with rapid changes in the market. Only a few components, such as the picker and guide, need to be replaced for changing to a new assembly model.

• The Optical Journal
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• s.133
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• pp.33-37
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• 2011

카메라 광학을 측정한다는 것은 워낙 광범위하기 때문에 이러한 내용을 소개함에 앞서 우선 영상 렌즈가 장착되어야 할 카메라 센서가 정의되어 있는지, 아닌지를 설명해야 할 것 같다. 이 글은 카메라 센서가 정확히 사전에 정의된 카메라 모듈 -주로 휴대폰, 스마트패드, 노트북 등에 장착되는 -로 한정하여 광학 측정 및 그에 따른 포커싱 조정 기술 동향을 소개하고자 하는 것이다. 카메라 센서가 정의되어 있다는 것은 카메라 렌즈만을 놓고 측정하는 것이 아닌, 카메라 렌즈와 센서가 조립된 상태, 또는 최적으로 조립하기 위한 광학 측정 기술을 소개하려고 한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.121-121
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• 2004

최근 급속히 성장하고 있는 광통신산업의 발전에 있어서 주목할 만한 경향 중에 하나는 제품의 소형화 및 집적화라 할 것이다. 마이크로 광모듈 접속/조립 시스템은 광모듈을 소형화하고 고기능성 광통신 부품의 개발에 있어 가장 필요한 장비이다. 이에 본 연구에서는 초소형 광모듈 접속/조립 시스템을 개발하기 위하여 두께가 약 30 $\mu\textrm{m}$인 박막형 필터와 렌즈일체형 파이버를 접속/조립할 수 있는 시스템을 개발 및 초소형 광통신용 1$\times$1 OADM(Optical Add/Drop Module) 모듈을 제작하였다.(중략)

• Journal of the Korea Society for Simulation
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• v.16 no.2
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• pp.65-74
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• 2007

Virtual manufacturing (VM) is a powerful technology for developing a new product, new equipment and new manufacturing system, and three-dimensional (3D) simulation is a core technology in VM. 3D simulation involves both mechanical simulation and discrete event simulation. This paper introduces a case study of implementing 3D simulation for developing an automatic assembly line in a Korean optical factory. This factory produces a lens module that is the part of a phone-camera. 3D simulation technology is applied from the early stage of development. In the conceptual design and the initial design phases for individual equipment, 3D mechanical simulation using $CATIA^{(R)}$ and $IGRIP^{(R)}$ is conducted. 3D discrete event simulation with $QUEST^{(R)}$ is applied to the detailed design of the equipment and of the whole system. The focus of the simulation is to verify the technical and economical feasibility of the new automatic system. As a result, the takt time is reduced to the quarter of the manual system, and the number of workers in a line is reduced tremendously.

• Journal of the Korea Society for Simulation
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• v.23 no.4
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• pp.131-142
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• 2014

Phone camera lens module is assembled with a barrel, multiple lenses, multiple spacers and a shield. The major processes of manufacturing system are injection molding, coating and assembly processes, and each process has multiple machines. In this paper, we introduce a scheduler based on simulation model which can be used for frequent rescheduling problem caused by urgent orders, breaking down of molds and failures of machines. The scheduling algorithm uses heuristic Backward-Forward method, and the objective is to minimize the number of tardy orders.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.974-977
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• 2005

Automatic lens assembly system is used for automatically assembling the lens module of phone camera. In this paper, we are trying to develop the cluster type automatic lens assembly with standard tray for applying for assembly field directly. This paper proposes the principle of cluster type lens assembly system and the related assembly production line concept for optimal automatic lens production line.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.20 no.4
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• pp.509-515
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• 2011

When a manufacturing system is designed, various kinds of evaluation methods are used for selecting the best alternative. Net present value, inner rate of return and payback period are popular quantitative measures for the economic assessment, but other qualitative measures should be considered for evaluation. The analytic hierarchy process(AHP) has been used as the popular method for the multi criteria decision making problem that considers both quantitative and qualitative criteria. This paper explains the process of economic assessment, and how to use the AHP for evaluating the designs of the assembly lines for lens module installed in mobile phone.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.11a
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• pp.667-668
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• 2008

• Korean Journal of Optics and Photonics
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• v.29 no.4
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• pp.149-158
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• 2018

A generalized structural design equation can be used to simplify and systematize a telecentric lens system composed of multiple lenses, as a creative design method of the authors. Through this structural equation, we have investigated the feasibility and design methodology of a telecentric lens equipped with a conventional smartphone camera for machine vision. As a result, we could verify and present a useful, generalized structural equation termed the $f{\theta}$ formula, being able to divide and combine the whole telecentric lens system into two modularized lens groups.