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Self-Adjustment Module을 이용한 초소형 폰카메라 레즈모듈 조립기
이창우,송준엽,하태호,정영상 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
An alignment error is occurred certainly when parts are assembled. In general, this alignment error is corrected using measuring system and position control. In this case, an assembly machine has a high stiffness that makes a size of machine huge. The purpose of this research is invention of the module that can adjust one part to the order part automatically. The module that has a function of self adjustment only takes a stiffness in assemble direction and can be moved freely in the other direction so this function makes a self adjustment. The self adjustment module reduces the tact time and also diminishes the inferior goods and makes a size of machine small. A self-adjustment module is applied to an assembly machine that assemble a lens module for phone camera.
렌즈 모듈 생산 공정에서 조립 정렬을 위한 자동 초점 제어
김형태(Hyung Tae Kim),강성복(Sung Bok Kang),강희석(Heui Seok Kang),조영준(YoungJoon Cho),박남규(Nam Gue Park),김진오(Jin-Oh Kim) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.2
This study proposed an auto focusing method for a multi-focus image in assembling lens modules in digital camera phones. A camera module in a camera phone is composed of a lens barrel, an IR glass, a lens mount, a PCB board and aspheric lenses. Alignment among the components is one of the important factors in product quality. Auto-focus is essential to adjust image quality of an IR glass in a lens holder, but there are two focal points in the captured image due to thickness of IR glass. So, sharpness, probability and a scale factor are defined to find desired focus from a multi-focus image. The sharpness is defined as clarity of an image. Probability and a scale factors are calculated using pattern matching with a registered image. The presented algorithm was applied to a lens assembly machine which has 5 axes, two vacuum chucks and an inspection system. The desired focus can be determined on the local maximum of the sharpness, the probability and the scale factor in the experiment.
μ-부품 조립용 Self Adjustment Module 개발
이창우,송준엽,하태호 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
According to the ubiquitous times that is new important topic, the miniature is demanded in the industry at large. The high accuracy and accumulation make the assembly equipment and the production equipment huge from the size of view. The huge equipment brings about the expensive price of the equipment, a low flexibleness and a low productivity. It makes the manufacturing equipment huge that the accuracy only depends on the mechanism stiffness. The position of two assembled parts is transformed with the global coordinate system whose datum is machine coordinate system. The purpose of this research is invention of the module that can adjust one part to the order part automatically. The module that has a function of self adjustment only takes a stiffness in assemble direction and can be moved freely in the other direction so this function makes a self adjustment. The self adjustment module reduces the tact time and also diminishes the inferior goods and makes reconfigurable machine in μ-part assembly.
김동진(Dong Jin Kim),김주호(Ju Ho Kim),윤영복(Young Bok Yoon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In the manufacturing process of mobile phone cameras, the deformation of lens surface by lens-barrel shrink fit is a dominant obstacle to obtain better optical performance. Careful and precise design for the interference of shrink fit is necessary but time consuming. In order to determine proper interference of lens-barrel, we investigated the effects of shrink fit on lens surface deformation using analytical and numerical methods.
임동현(Donghyun Lim),최재성(Jaiseong Choi),고우석(Wooseok Ko),박효준(Hyojun Park),이경수(Kyeongsoo Lee),이형철(Hyungchul Lee),송준엽(Junyeob Song),이창우(Changwoo Lee),하태호(Taeho Ha),곽윤근(Yoonkeun Kwak),김수현(Soohyun Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
With popularization of camera function in mobile phones, assembly process of miniaturized phone camera modules need to be automatized for the mass production. We developed the gripper system for mobile phone camera module assembly. This system includes the lens module and camera module assembly system. Optical parts in camera module have various shapes. And each design of parts can be changed with needs of market. So, we focused on the adaptability and flexibility of assembly process in the system design. And to estimate the state of insertion, we measured tilting position error of optical parts in barrel with optical apparatus.
Optical Distance Control for a Multi Focus Image in Camera Phone Module Assembly
김형태,강성복,강희석,조영준,김진오 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
This study aims at developing a focusing method for an image with multiple focal distances. A dynamic focus region (DFR)is defined to find the object of interest to be focused on. The DFR is built from the edge fragments detected using several narrow ROIs across the vision screen. The proposed method was applied to the camera module assembly. The inspected images usually have multiple areas with different focal distances, due to the different thicknesses of the components. An assembly machine was constructed to verify the DFR for the experiment. The distance between the lens mount and vision camera was adjusted to find the focus position by means of the sharpness and DFR. The result shows that the desired object is brought into focus and the proposed method can be applied to the camera module assembly process.
Optical Distance Control for a Multi Focus Image in Camera Phone Module Assembly
Kim, Hyung-Tae,Kang, Sung-Bok,Kang, Heui-Seok,Cho, Young-Joon,Kim, Jin-Oh 한국정밀공학회 2011 International Journal of Precision Engineering and Vol.12 No.5
This study aims at developing a focusing method for an image with multiple focal distances. A dynamic focus region (DFR) is defined to find the object of interest to be focused on. The DFR is built from the edge fragments detected using several narrow ROIs across the vision screen. The proposed method was applied to the camera module assembly. The inspected images usually have multiple areas with different focal distances, due to the different thicknesses of the components. An assembly machine was constructed to verify the DFR for the experiment. The distance between the lens mount and vision camera was adjusted to find the focus position by means of the sharpness and DFR. The result shows that the desired object is brought into focus and the proposed method can be applied to the camera module assembly process.
다중노광 나노구 리소그라피를 이용한 쌍-광자결정 어레이 제작
여종빈,한광민,이현용,Yeo, Jong-Bin,Han, Gwang-Min,Lee, Hyun-Yong 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.3
Two dimensional(2D) pair-photonic crystals (pair-PCs) have been fabricated by a multiple-exposure nanosphere lithography (MENSL) method using the self-assembled nanospheres as lens-mask patterns and the collimated laser beam as a multiple-exposing source. The arrays of the 2D pair-PCs exhibited variable lattice structures and shape the control of rotating angle (${\Theta}$), tilting angle (${\gamma}$) and the exposure conditions. In addition, the base period or filling factor of pair-PCs as well as their shapes could be changed by experimental conditions and nanosphere size. A 1.18-${\mu}m$-thick resist was spincoated on Si substrate and the multiple exposure was carried out at change of ${\gamma}$ and ${\Theta}$. Images of prepared 2D pair-PCs were observed by SEM. We believe that the MENSL method is a suitable useful tool to realize the pair-periodic arrays of large area.
이창우,이재학,송준엽,하태호,정영상 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-
Self-adjustment module has been introduced for alignment error compensation in a previous paper. Self-adjustment module guarantees accurate arrangement of lens parts during assembly process in spite of alignment error so that remarkable price reduction and miniaturization of assembly machine could be achieved. But this module can not control lens orientation. Cellular phone camera lens is produced by plastic injection molding process, so lens has other special quality according to the orientation. In this paper assembly machine for lens module is designed to control lens orientation.
송준엽(Jun Yeob Song),하태호(Tae Ho Ha),이창우(Chang Woo Lee),김동훈(Dong Hoon Kim),전종(Jong Jeon) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.2
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. 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.