• Korean Journal of Optics and Photonics
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• v.6 no.1
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• pp.1-7
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• 1995

A IR zoom telescope system was designed for thermal imagery. The magnification is 4-14 and the focal length of eye piece is 25 mm. First, the frame was built up with first order optics and started design with 3rd order optics. There after, we can get the final design by optimization technique through finite ray tracing. The optical system was optimized with ray aberration or angular aberration including higer orders. Finally, The performance of the optical system was accessed by calculating the diffraction MTF from the design data. data.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.20 no.6
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• pp.811-816
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• 2011

We develop a plastic object lens for blu-ray disc playing pick-up module as morethan 0.85 numerical aperture in this research. We design plastic object lens for blu-ray disc playing pick-up module's each factor's in balanced and made our designed lens by injection molding. Furthermore, by correction designing in mold-core, we optimization our lens efficiency as world grade; wave front aberration $0.028{\lambda}$. RMS, light axis differential 0.3967arcmin. We can manufacture localized blu-ray disc's pick-up lens's component and by this fact we obtain international competitiveness. The result of this research will be very helpful to develop a single objective lens for 3 different wavelength of laser diodes in playing and recording pick-up module.

• 정보저장시스템학회:학술대회논문집
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• 2005.10a
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• pp.151-152
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• 2005

Blu-ray 디스크에서는 NA=0.85 의 높은 개구수를 채용함으로써 디스크 보호층의 두께 변동에 따른 구면수차 발생량이 매우 커지는 문제가 발생하게 된다. 따라서 디스크 두께 공차 $3{\mu}m$에서 Blu-ray 시스템의 수차 발생 허용수준을 초과한다. 그리고 Multi-layer 디스크의 경우 각 층의 간격이 $25{\mu}m$ 정도의 간격을 두고 배치되어 있어 기록층 사이에서 발생하는 구면수차의 보정이 필요하며, 종래의 기술은 보상범위가 $3{\mu}m$로 한정되어 사용이 불가능하며 또한 대물렌즈 조립공차가 엄격히 관리되어야 하는 문제점을 안고 있었다. 본 연구에서는 액정렌즈에 의한 구면수차 보정으로 이러한 문제점들을 해결하고자 하였다. 액정렌즈는 오목렌즈 액정소자와 볼록렌즈 액정소자로 구성되며 픽업 광학계 내에 조합하여 설계함으로써 Multi-layer 디스크의 두께 변동에 따라 발생하는 구면수차를 보정하고 대물렌즈 조립공차 문제를 해결할 수 있다.

• Korean Journal of Optics and Photonics
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• v.10 no.2
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• pp.102-106
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• 1999

In this study, inhomogeneous amplitude modulation effects on the imaging performance a lens system are expermentally investigated by measuring the diffraction OTF. The lens under the test is a binocular objective made in Korea. Inhomogeneous amplitude modulation is carried out by positioning the modulator cross contacted to the lens under test which is illuminated by collimated light beam. The aberration characteristics of the lens under test are examined by caculating the ray-fan through finite ray tracing. The MTFs of the lens illuminated by the homogeneous and inhomogeneous light beam are measured on the Gaussian image plane and compared with one another.

• Korean Journal of Optics and Photonics
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• v.20 no.6
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• pp.311-318
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• 2009

We present an attractive real time in-vivo endoscopic microscope with a resolution of submicron, in which two kinds of optical correcting plates are inserted to eliminate higher order spherical aberration and field curvature. And, since the conventional objective lens is replaced to GRIN lenses with diameter of 1 mm, the above endoscopic microscope can be effectively utilized to invade minimally for live animals.

• Korean Journal of Optics and Photonics
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• v.4 no.1
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• pp.22-27
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• 1993

We investigate the phase modulation effects on the OTFs of a binocular objective which is made in Korea.The OTFs are calculated from design data for FOV $0^{\circ}$ and $1.5^{\circ}$.The phase modulation is carried out by giving phase retardation $\pi$ on the aperture. The areas where the phases are retarded $\pi$ on the aperture are of an annular type. The OTFs of phase modulated aperture are also compared with that of unmodulated one. The OTFs of an aberration loaded system can be improved by proper phase modulation.

• RED RIBBON
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• s.69
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• pp.38-40
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• 2006

콘돔에 대해 들어본 적도 없는 캄보디아의 빈민층, 알지 못하는 사이에 에이즈에 걸리고 죽어가며 가난과 병 또한 대물림되고 있는 현실, 많은 봉사자들이 지금 이 순간 하나인 지구에서 서로 돕지 않으면 안된다는 시대적 사명을 앞장서서 실천하고 있다.

• 한국전자현미경학회:학술대회논문집
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• 2004.05a
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• pp.69-73
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• 2004

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.11a
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• pp.337-338
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• 2010

• Journal of Korea Foundry Society
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• v.43 no.4
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• pp.210-215
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• 2023