• The Science & Technology
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• v.29 no.11 s.330
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• pp.84-85
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• 1996

세계 최초로 1.5m 근거리 물체를 선명하게 관측할 수 있는 근거리관측 겸용 망원경을 개발한 한국 OTC는 특허 출원을 끝내고 세계시장을 무대로한 수출준비에 바쁘다. 대물렌즈를 루비코팅해 눈에 해로운 자외선과 적외선을 차단시키는 기능까지 갖추고 가격도 기존제품의 절반 값으로 공급하고 있어 선풍적 인기를 끌고 있다.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.96-96
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• 2013

전기습윤이란 고체 표면에 형성된 액적에 전기장을 인가하게 되면 액적과 표면의 계면에너지 감소로 인해 접촉각이 변화되는 현상을 말한다. 이 현상은 전자종이 구현에 응용이 모색되고 있으며, 다초점 렌즈, 마이크로 프리즘, 반사형 디스플레이 등에도 응용될 수 있다. 전기습윤현상의 응용 가능성이 현실화됨에 따라 최근 여러 표면에서의 전기습윤 현상이 연구되고 있다. 예를 들면, 나노 구조로 형성된 실리콘 기판에서 molten salt (1-ethyl-3-methyl-1-H-imidazolium tetrafluoroborate)에 22 V를 인가하면 약 $180^{\circ}$에서 $110^{\circ}$로 접촉각변화를, cyclopentanol에 50 V를 인가하면 표면에 완전히 퍼지는 현상이 보고된 바 있고, 배열된 Carbon Nanotube 박막에서는 탈이온수와 0.03 M NaCl 용액에 대해서 0~50 V를 가해줌에 따라 각각 $155^{\circ}$에서 $90^{\circ}$, $130^{\circ}$에서 $50^{\circ}$로의 접촉갑 변화가 있음이 관찰되었다. 본 연구에서는 화학적으로 안정하고 그 활용도가 매우 광범위한 실리카 코팅층을 전기분무증착법(electrospray deposition)을 이용해 형성하고, 코팅층의 표면 거칠기와 구조, 전기절연층의 두께 등에 따른 전기습윤 현상 거동을 조사하였다.

• Proceedings of the KAIS Fall Conference
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• 2008.05a
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• pp.43-45
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• 2008

박막 제작공정은 반도체 제작 공정, 고정밀도의 하드디스크 및 레이저 디스크 기술, LCD/P에 DML평판 디스크 플레이어 제작 공정에 있어 중요한 기술이다. 더욱이, 이 공정은 이동 전화 커버의 증착 및 전자 차폐의 일반기술, 램프의 반사판, 화장품 용기, 몇몇 상품에 있어 카메라 렌즈의 광학 표면 코팅과 코팅 필름 제작에 사용된다. 본 연구의 주요목적은 반도체 제작 공정과 많은 산업 분야에서 기본 재료로 사용되는 전영저항의 개발에 있다. 개발 공정은 다음과 같다. 전자빔이 최상의 진공 분위기에서 텅스텐 필라멘트의 열에 의해 방출된다. 그때 전자는 높은 전압에서 가속화된다. 전자들은 반대 재료에 충돌되고, 반대편 재료는 발생 열에 의해 코팅된다. 1차년도 연구목적은 고성능 전열 저항체 개발을 위한 지름 당 필라멘트 선의 기계적 특성을 조사하고 CAE 해석을 수행하며, 2차 년도에는 대량 생산 라인 구축을 위한 자동검사 라인 개발에 초점이 맞추어져 있다. 만일, 본 연구를 통해 전열 저항체가 개발된다면, 그 제품은 고효율, 외국제품 대비 가격 경쟁력을 가지므로 제품 경쟁력을 가질 수 있을 것으로 생각된다.

• Korean Journal of Optics and Photonics
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• v.8 no.3
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• pp.189-193
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• 1997

Aspheric pick-up lenses are increasingly used in consumer products such as computer and multimedia, as their mass production has become possible owing to the injection molding process. However still much work needs to be done for more effective manufacture of aspheric lenses, one area of which is the in-line inspection of produced lenses. In this paper, we present a lateral-shearing interferometer that has specially been designed to have a high immunity to external vibration and atmospheric disturbance. The interferometer comprises four prisms. They are directly attached to each other using an immersion oil so that relative sliding motions between the prisms are allowed. Their relative displacement can readily generate necessary lateral-shearing and phase-shifting to determine the wavefront of the beam collimated by the lens under inspection. A special phase-measuring algorithm of arbitrary-bucket is adopted to compensate the phase-shifting error caused by the thickness reduction in the immersion oil. Zernike polynomial fitting has done for determinating quantitative aberration of aspheric pick-up lenses. The interferometer built in this work is robust to external mechanical vibration and atmospheric disturbance so that experimental results show that it has a repeatability of less than λ/100.

• Journal of Korean Ophthalmic Optics Society
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• v.7 no.2
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• pp.129-134
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• 2002

We obtained the UV cut-off effect of tinted CR-39 Ophthalmic lens with the respect of concentration of green, brown, blue color. First, we analyzed the UV spectrum of tinted CR-39 lens measured by Spectrophotometer and then compared the UV data by Spectrophotometer with UV data by UV tester used in an optician shop. The result obtained show that the UV cut-off effect is increased with color concentration of tinted CR-39 lens, and the transmittance of 0%~5% at 400nm by Spectrophotometer is correspondence with transmittance of 0% by UV tester.

• Journal of Korean Ophthalmic Optics Society
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• v.7 no.1
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• pp.35-38
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• 2002

Ferrite thin film with glass substrate was prepared by ferrite plating method in order to make sunglass which cut off ultraviolet and electromagnetic field. It has single phase of polycrystalline spinel structure and has gloss like as mirror and has hardness without scratch by scraping with nail. The transmittance of ferrite thin film is lowered near 400nm manifestly, which shows that the ferrite thin film was cut off ultraviolet successfully. Therefore, the sunglass with ferrite plating is use of cut of ultraviolet and electromagnetic field.

• Journal of Korean Ophthalmic Optics Society
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• v.19 no.2
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• pp.135-143
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• 2014

Purpose: To evaluate the blue-light blocking ratio and luminous transmittance of blue-light blocking lenses using the blue-light hazard function as specified in international standard. Methods: In order to calculate the blue-light blocking ratio and luminous transmittance for a total of 41 blue-light blocking lenses from 8 manufacturers, UV-Vis spectrophotometer was used for measuring the spectral transmittance of wavelengths from 380 to 780 nm. Blue-light blocking ratio was calculated using blue-light hazard function as specified in ANSI Z80.3:2010 and ISO 13666(or Korean Standard KS B ISO 13666:2004). Results: The range of the blue-light blocking ratio was from 9.3 to 96.8%, the range of the transmittance from 53.5 to 92.7%, and the range of the luminous transmittance from 58.0% to 98.1%. In general the blue-light blocking lens prepared by coating tended to have a higher luminous transmittance, while those prepared by tinting a higher blue-light blocking ratio. Conclusions: The behavior of the spectral distribution of lenses showed the possibility of the performance improvement in the blue-light blocking lenses. Manufactures need to acquire their own technology that can evaluate the performance of blue-light blocking lens based in international standard.

• Journal of Korean Ophthalmic Optics Society
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• v.13 no.1
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• pp.59-63
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• 2008

Purpose: Ti thin films were deposited on slide glass and CR-39 lenses using small magnetron sputtering apparatus to of Ti thin films. Methods: The thickness of Ti thin films were measured by cross section SEM, the transmittance and reflectance of them were obtained using spectrophotometer, the refractive index and extinction of them were obtained from VASE data. Results: The transmittances of Ti thin films with 60 nm, 120 nm, 140 nm thickness were a little change within the visual region from 400 nm to 750 nm, but were increased a little amount at near 400 nm. The transmittance of 60 nm, 120 nm, 140 nm Ti thickness in d-line was 30%, 25%, 20%, respectively. Also, it was shown that the refractive indices and extinction coefficients of the Ti thin films obtained from VASE were similar to those of Ti thin film offered macleod program. Conclusions: Ti films on CR-39 with these transmittances were available for sunglass lens. It was indicated that the refractive indices and extinction coefficients of the Ti thin films were decreased with the thickness of Ti thin film, for the thickness of Ti thin films was due to very thin.

• Journal of Korean Ophthalmic Optics Society
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• v.16 no.3
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• pp.229-235
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• 2011

Purpose: The present study was performed to evaluate the safety of ophthalmic lenses in domestic market since eyeglasses wearers could be exposed to the negligent accident by damaged ophthalmic lenses. Method: Totally, 160 ophthalmic lenses (NK55, ${n_{d}}$ = 1.56) with the refractive powers of -3D, -6D, +3D, +6D manufactured by 4 companies in domestic market were evaluated using drop ball test. In accordance with FDA standard, steel ball (~16 g) was freely dropped on these ophthalmic lenses from 127 cm high and the surfaces of lenses were observed. Results: From the study, center thicknesses of NK55 ophthalmic lenses manufactured by 4 different companies showed somewhat different numbers even though the lenses had the same refractive index and powers. All convex lenses of +3D, +6D were evaluated as the safe lenses since there was no damage such as crack and broken found on the lens surfaces after drop ball testing. However, some noticeable broken was shown on the surfaces of concave lenses with relatively thinner center thickness. Especially, 59(73.8%) of total 80 concave lenses with the refractive power of -3D and -6D classified as unacceptable lenses to FDA standard. Conclusions: From the results, the negligent accident by damaged ophthalmic lenses should be considered as well as the correction of visual acuity, design and price when customers purchase eyeglasses. Thus, the enforcement regulation like drop ball testing of uncut ophthalmic lens could be suggested to guarantee the safety of ophthalmic lenses in domestic market.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.156-158
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• 2009

우리 연구팀은 $SiO_2$ nanospheres를 이용한 natural lithography를 통해 2가지 방법으로 GaAs 기판의 반사율을 감소시켰다. 먼저 GaAs 기판 위에 benzocyclobutene(BCB) 고분자를 코팅한 후, 그 위에 $SiO_2$ nanospheres를 코팅한다. 그리고 고분자의 유리전이 온도이상으로 가열하면 $SiO_2$ nanospheres가 고분자 속으로 가라앉게 되어 렌즈 형태의 표면이 형성된다. 또한, 이 상태에서 BOE 용액을 통해 $SiO_2$ nanospheres를 제거하여 오목한 형태의 표면을 형성할 수 있다. 이러한 2가지 방법의 surface texturing을 통해 우리는 GaAs 표면의 반사도를 각각 400~800nm의 파장에서 평균 13.6%~16.52%의 반사율을 얻을 수 있었다.