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임현선(Hyeon Seon Lim),지택상(Taek Sang Ji),김봉환(Bong Hwan Kim) 한국안광학회 1997 한국안광학회지 Vol.2 No.1
In this paper, the rate of transmittance regarding the home -and foreign-made lens that have been treated with multi coating and no coating has been studied in the range of the visible ray. The lens that were treated with No Coating turned out to be about 93% of the rate of transmittance, but those treated with Coating turned out to be over 98%. Especially, the rate of transmittance of product made by a company in a foreign country turned out to be homogeneous in the whole range.
임현선(Hyeon Seon Lim),지택상(Taek Sang Ji),김봉환(Bong Hwan Kim) 한국안광학회 2000 한국안광학회지 Vol.5 No.1
The rate of transmittance of the sunglasses sold at home is shown in this paper. Most of the lens treated with sunglasses turned out to be 0% in the range of the UV, but those made by some company to be 18%.
35mm 카메라 비구면 줌 렌즈계의 광학적 성능을 통한 비구면 분석
지택상(Taek Sang Ji),임현선(Hyeon Seon Lim),김봉환(Bong Hwan Kim) 한국안광학회 2001 한국안광학회지 Vol.6 No.1
We analyzed aspheric patterns after we investigated zoom lens` constructions and optical capacities of a ordinary designed 35 ㎜ camera with an aspheric zoom lens system in this research. As this lens system was the zoom lens system about infinite object point, it was made to get a short back focal length. be able to use a lens unit more close to the image plane, and be used the compact camera which got a viewing system. The zoom ratio of the system was 1 : 2 and it got a positive and negative power`s distribution. As it was determined the 35∼70 ㎜ focal length range which the most common people used, it might be called economic optical system considered universality. As it was used two aspheric surface, it was used just three lens, compensated the aberration and schemed lens` miniaturization, lightweightization, and the decrease effect of the unit cost of production.
지택상(Taek Sang Ji),임현선(Hyeon Seon Lim),박성혜(Sung Hye Park) 한국안광학회 1997 한국안광학회지 Vol.2 No.1
We chose four types of Huygenian, Ramsden, Kellner, Erfle, among the eyepieces frequently used for optical instruments. Then we calculate their optical properties and investigated characters of each type by comparing them.