• 한국기계가공학회지
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• 제7권4호
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• pp.17-23
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• 2008

Development of die technology for holder and barrel dies is necessary according to minimization of lens assembly, image sensor, and connectors. In these cases, there are two technical problems arising from die design. One is determination of knock-out pin location in die set. Minimization of lens assembly size make it difficult to obtain ejecting space. The other is whether or not high-precision die technology is possible to reduce torque variation when holer and barrel products is assembled. In this study, multi-cavity die set was developed taking advantage of gear-driven ejecting method. In the developed technology, die manufacturing technology was guaranteed with a high-precision level.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.57-57
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• 2007

Aspheric glass lenses have many optical advantages, for glass have superior optical performance and an aspheric form can reduce optical aberrations. Recently, the use of it is rapidly expanding as the mass production becomes possible by glass molding press and so this method is considered as the best method for fabricating an aspheric glass lens, but it is difficult to control many parameters for pressing and cooling process. Design of experiments (DOE) is a very useful tool to design and analyze complicated industrial design problems. This study investigated the pressing conditions to mold aspheric glass lenses for mega pixel phone camera module using DOE method. We have applied fractional factorial design and the response variable was set form accuracy (PV) of aspheric surface of molded lens. The results of analysis indicates that all factors expect for pressing force of each step are available for the form accuracy (PV). It was the optimum condition of the designed pressing conditions for lowering the form accuracy(PV) value of molded lens that all factors were at the low level. The form accuracy (PV) of mold and molded lens under the optimum condition are $0.85\;{\mu}m$ and $0.922\;{\mu}m$ respectively.

• 대한공간정보학회지
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• 제20권2호
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• pp.93-100
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• 2012

현대사회에서 3차원 정보에 대한 관심과 활용도는 급속히 증가하고 있으며, 영화와 TV뿐만아니라 스마트폰에서도 입체시가 가능한 제품이 출시되고 있다. 스마트폰은 다른 기기와 달리 일상생활에 밀접하게 활용되고 있으며, 그 활용도 역시 무궁무진하다. 본 연구에서는 스마트폰의 스테레오 카메라를 이용하여 촬영을 수행하고 정량적인 정보의 취득이 가능한지 실험하였다. 또한, 취득된 정량적인 정보가 어느 정도 정확도를 가지는지 평가함으로써 스마트폰의 정량적 활용성을 평가하고자 하였다. 이를 위해 먼저 스마트폰에 장착된 카메라 두 대에 대한 렌즈 검정을 수행하여 내부표정요소들을 결정하였다. 결정된 내부표정요소들을 이용하여 테스트필드의 타겟들에 대한 3차원 좌표를 계산하고 정밀하게 관측한 기준좌표들과 비교하였다. 또한, 임의의 건물을 대상으로 표정을 수행한 결과 X=0.0674m, Y=0.25319m, Z=0.04983m의 표준편차를 나타내었으며 도화가 가능하였다. 이러한 결과는 cm급의 높은 정확도를 요구하지 않는 근거리 소규모측량에서는 스마트폰 스마트폰을 이용하여 정량적 정보를 취득하고 이것을 활용하는 것이 가능하다는 것을 보여준다.

• 정보저장시스템학회논문집
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• 제1권2호
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• pp.115-120
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• 2005

As a popularity of a portable digital device such as a cellular phone, a digital camera and a MP3 player is spreading, the demand of the mobile storage device increases rapidly. A bluray technology using 405nm laser diode and objective lens having high NA(Numerical Aperture), 0.85, satisfies a miniaturization and a high capacity which are the requirements of the portable device. To develop SFFOP(small form factor optical pickup), it is prerequisite to minimize the number of optical components and establish evaluation and assembly method of micro optical pickup system as well as mass production method of micro optical component. To minimize optical elements of optical pickup, there have been many researches to use P-HOE(Polarized Holographic Optical Element) due to its extremely small size and versatile function. However, P-HOE is handled and assembled very accurately in SFFOP. In this paper, static error signal detection method is developed for an alignment of P-HOE in SFFOP. Using developed static error signal detection method, P-HOE can be aligned very accurately with real time result of static error signals of pickup such as FES(focusing error signal) and TES(Tracking Error Signal). The developed static error signal detection method is verified by the evaluation of commercialized DVD Pickup. And finally. developed static error signal detection method is applied for the assembly of P-HOE in SFFOP system satisfies specification of BD(Blu-ray Disk).