• 제목/요약/키워드: Spherical Glass lens

검색결과 23건 처리시간 0.042초

공명초음파분광법을 활용한 광학기기용 렌즈의 결함평가 (Defect Evaluation of Optical Lens by Resonant Ultrasound Spectroscopy)

  • 김성훈;백경윤;김영남;양인영
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2004년도 추계학술대회 논문집
    • /
    • pp.1491-1495
    • /
    • 2004
  • In this paper, resonant ultrasound spectroscopy(RUS) was used to determine the natural frequency of a spherical and a aspherical lens. The objective of the paper is to evaluate defect and shape error by using nondestructive evaluation method with Resonant Ultrasound Spectroscopy(RUS). The principle of RUS is that the mechanical resonant frequency of the materials depends on density, and the coefficient of elasticity. We evaluated existence of flaws through comparison with resonant frequency of a spherical and a aspherical lens. The spherical glass lenses were made of BK-7 glass, one's diameter in 2mm and 5mm. The polished spherical glass lenses had no deflection or a deflection below 2.0${\mu}{\textrm}{m}$. Also, The aspherical lens were made of same material and ones diameter in 7mm and thickness in 3.4mm. In the experiment, we were performed to investigate relationship between frequency measuring parameter($\beta$) and mass of each specimens. The difference between resonant frequency and mode of aspherical glass lens which has no defect was distinguished from aspherical glass lens which has some defects.

  • PDF

RUS법에 의한 광학기기용 렌즈의 주파수 특성평가 (The Evaluation on the frequency Characteristics of the Optical Glass Lens by Resonant Ultrasound Spectroscopy)

  • 양인영;김성훈
    • 비파괴검사학회지
    • /
    • 제25권2호
    • /
    • pp.127-132
    • /
    • 2005
  • 광학기기용 렌즈는 결함이 없는 높은 형상정밀도가 요구되어지는 제품으로써 본 논문에서는 공명초음파 분광법을 이용하여 결함을 검출하는 시험을 하였다. RUS는 시험편을 가진 시켜 양품시험편과 결함을 갖는 시험편 사이의 공진주파수 차를 검사하는 측정시스템이다 RUS를 이용한 비파괴 평가를 위하여 우리는 구면렌즈와 비구면 렌즈의 공진주파수를 측정하였다. 그 결과, 우리는 측정된 공진주파수에 의해 구면렌즈의 연마 가공정도를 알 수 있었으며, 결함을 갖는 비구면 렌즈의 특성평가를 할 수 있었다.

고화소 디지털 카메라 비구면 Glass렌즈 초정밀연삭 특성에 관한 연구 (A Study on Grinding Characteristics of Aspherical Glass Lens core of High-pixel Digital Camera in Diamond Grinding Process)

  • 현동훈;이승준
    • 한국공작기계학회논문집
    • /
    • 제12권2호
    • /
    • pp.31-36
    • /
    • 2003
  • Electronic or measuring instruments equipped with aspherical lens have recently been used since aspherical lens is more effective than spherical one. for the mass production of aspherical lenses, specific molds with precisely machined cores should be prepared. Some researches on the aspherical lens machining have been carried out to date. However, ultra-precise finding of aspherical or mold core has not been fully studied. In this study, the ultra-precise grinding and evaluating system were established to investigate the finding characteristics of aspherical lenses. Unlike conventional grinding process, since a highly-precise lathe were operated in a clean room without vibration the experimental results can be very useful for further studies on ultra-precise grinding process.

자기 진단형 초정밀 렌즈 폴리싱기의 개발 및 성능 평가에 관한 연구 (A Study on the Development and Performance Evaluations for a Self-diagnostication Ultra-precision Lens Polishing Machine)

  • 박수현;임상헌;이춘만
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2006년도 춘계학술대회 논문집
    • /
    • pp.241-242
    • /
    • 2006
  • Spherical glass lenses are used in many optical industries. The curvature, eccentricity and height of a tool affect the surface roughness and curvature of lenses. The purpose of this study is the development and performance of a self-diagnostication ultra-precision lens polishing machine. In this paper, structure analysis is performed to reduce maximum displacement and to maintain outside the resonance region by CATIA V5. A spherical center setting gage is developed to increase accuracy of the manufactured lenses. The surface roughness, curvature and thickness of the manufactured lenses are measured and studied.

  • PDF

Hybrid 비구면 렌즈를 이용한 Eye glass Display용 광학시스템의 최적화 (Optimization of optical design for Eye Glass Display using hybrid aspheric lens)

  • 김태하;박광범;박영수;김휘운;석종민;문현찬
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2005년도 춘계학술대회 논문집 디스플레이 광소자 분야
    • /
    • pp.123-126
    • /
    • 2005
  • Eye Glass Display (EGD) with microdisplay to realize the virtual display can make the large screen, so virtual image has been developed by using microdisplay panel. This paper shows study of low cost lens design and simulation for microdisplay system with 0.6"LCoS panel. Lens design optimized consider to spherical aberration, astigmatism, distortion, and chromatic aberration. Code V is used and it designed an aspheric lens about exit pupil 6mm, eye relief 20mm and 35 degree of field of view (FOV). With the application this aspheric lens to liquid crystal on silicon (LCOS) type's microdisplay, virtual image showed 50 inch at 2m. One side of the aspheric lens was constituted from diffractive optical element (DOE) for the improvement in a performance. It had less than 2.5% of distortion value and modulation transfer function in axial had 20% of resolution with 32 lp/mm spatial frequency. The optical system is suitable for display of 15.6 mm-diagonal with SVGA.

  • PDF

비구면 유리 어레이 렌즈 성형용 초경합금 코어 초정밀 연삭 가공에 관한 연구 (Study on Ultra-Precision Grinding Processing for Aspheric Glass Array Lens WC Core)

  • 고명진;박순섭
    • 한국정밀공학회지
    • /
    • 제33권11호
    • /
    • pp.893-898
    • /
    • 2016
  • Plastic array lens are cheap to manufacture; however, plastic is not resistant to high temperatures and moisture. Optical glass represents a better solution but is a more-expensive alternative. Glass array lens can be produced using lithography or precision-molding techniques. The lithography process is commonly used, for instance, in the semiconductor industry; however, the manufacturing costs are high, the processing time is quite long, and spherical aberration is a problem. To obtain high-order aspherical shapes, mold-core manufacturing is conducted through ultra-precision grinding machining. In this paper, a $4{\times}1$ mold core was manufactured using an ultra-precision machine with a jig for the injection molding of an aspherical array lens. The machined mold core was measured using the Form TalySurf PGI 2+ contact-stylus profilometer. The measurement data of the mold core are suitable for the design criterion of below 0.5 um.

Optimization of optical design for Eye Glass Display

  • Moon, H.C.;Kim, T.H.;Park, K.B.;Park, Y.S.;Seok, J.M.;Kim, H.W.
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
    • /
    • pp.1603-1606
    • /
    • 2005
  • Eye Glass Display (EGD) with microdisplay to realize the virtual display can make the large screen, so virtual image has been developed by using microdisplay panel. This paper shows study of low cost lens design and simulation for microdisplay system with 0.6" Liquid Crystal on Silicon (LCoS) panel. Lens design optimized consider to spherical aberration, astigmatism, distortion, and chromatic aberration. Code V is used and it designed an aspheric lens about exit pupil 6mm, eye relief 20mm and 35 degree of field of view (FOV). With the application this aspheric lens to LCOS type's microdisplay, virtual image showed 50 inch at 2m. One side of the aspheric lens was constituted from diffractive optical element (DOE) for the improvement in a performance. It had less than ${\pm}2%$ of distortion value and modulation transfer function in axial had 20% of resolution with 30 lp/mm spatial frequency. The optical system is suitable for display of 0.6"-diagonal with SVGA.

  • PDF

Telephotolens design with refractove/diffractive hybrid lens

  • Hong, Young-Ghi;Kim, Sun-Il;Yeo, Wan-Gu;Lee, Chul-Koo
    • Journal of the Optical Society of Korea
    • /
    • 제1권2호
    • /
    • pp.74-80
    • /
    • 1997
  • 300mm F/4.0 telephotolens with diffractive hybrid lens was designed, and its optical performance was tested and compared with a traditional lens system. DOE(Diffractive Optical Element) reconstructs wavefronts using wave phenomena of light to focus the incident light onto the focal point and has negative Abbe number while a traditional lens uses geometrical phenomena of light and has positive Abbe number. Therefore, a diffractive hybrid lens containing both refractive and diffractive elements can remarkably correct chromatic aberration and spherical aberration of an optical system. We investigated and analyzed the optical properties of a diffractive hybrid lens for the visible spectrum, and we used a difractive hybrid lens to design and evaluate a 300mm F/4.0 telephotolens without the special LD(Low Dispersive) glass lens which is costly and difficult to manufacture. Most traditional telephotolenses use the special LD glass for chromatic aberration correcton. Optical performance tests such as resolution and characteristics of aberration of both lens systems using a diffractive hybrid lens and traditional lens were performed.

성형용 초경합금(WC) 코어면의 Re-Ir 코팅이 형상정도와 표면조도에 미치는 영향에 관한 연구 (A Study on Influence of PV and Ra with Re-Ir Coating of WC Core Surface for Glass Molding Lens)

  • 김현욱;김상석;김혜정;김정호
    • 한국전기전자재료학회논문지
    • /
    • 제20권9호
    • /
    • pp.808-811
    • /
    • 2007
  • Aspheric glass lens have recently been used in camera phone module because they are more effective than spherical ones. In this paper, the grinding condition of the tungsten carbide molding core has been found after applying DOE to the development of the aspheric glass lens for the 3 Megapixel and 2.5x camera-phone module. Also, the ultra precision grinding process was investigated under this condition by experiment. Re-Ir coating was applied on the ground surface of the tungsten carbide molding core. The influence of Re-Ir coating on the form accuracy and surface roughness of molding core was compared and evaluated. The form accuracy and surface roughness of the molding core were improved by application of Re-Ir coating on the surface of the tungsten carbide molding core.

비구면 프리즘 렌즈를 이용한 소형 경량의 EGD용 광학계 설계 및 제작 (Aspherical prism lens design and manufacture of a small size and light wight EGD)

  • 김태하;박광범;김미정;박영수;김휘운;문현찬
    • 한국전기전자재료학회:학술대회논문집
    • /
    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
    • /
    • pp.454-454
    • /
    • 2007
  • Eye Glass Display (EGD) with microdisplay to realize the virtual display can make the large screen, so virtual image has been developed by using microdisplay panel. This paper shows study of spherical prism lens design and manufacture of a small size and light weigh EGD with 0.59" OLED panel. Code V is used and it designed an aspherical prism lens about eye relief 25mm and 42 degree of filed of view (FOV). With the application this aspheric prism lens to OLED type's microdisplay, virtual image showed 60 inch at 2m. It had less than 2% of distortion value and modulation transfer function in axial had 30% of resolution with 32 lp/mm spatial frequency. We made an injection molding bases to lens designed.

  • PDF