• Title, Summary, Keyword: Fresnel lens

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Micro replication quality of Fresnel lens using UV imprinting process (UV 임프린팅을 통한 프레넬 렌즈 제작 시 미세 복제 특성에 관한 연구)

  • Lim,, Ji-Seok;Kim, Byung-Wook;Kang, Shin-Ill
    • Transactions of the Society of Information Storage Systems
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    • v.6 no.1
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    • pp.37-40
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    • 2010
  • Fresnel lens is a kind of refractive optical lens with various advantages. It has nearly flat shaped optical lens that has small mass. Fresnel lens has number of applications in the compact optical systems. Recently, demands of high quality Fresnel lens for small size optical systems such as illumination units, compact imaging systems, display units, information storage systems, optical detecting units had increased rapidly. Conventional manufacturing process of high quality Fresnel lens is direct machining. However, it is not suitable for mass production because of high cost and long cycle time. Replication method can provide cost effective mass production process. However, there are various issues about replication of Fresnel lens. Fresnel lens has number of sharp blade shape prism. In the replication process, this blade shape causes defects that can affect optical efficiency. In this study, replication processes; injection molding process and UV imprinting process, were developed and evaluated using Fresnel lens that has maximum pattern height of $250\;{\mu}m$ and aspect ratio of 1.5.

Design of a Fresnel Lens for a Solar End-pumped Solid-state Laser

  • Ou, Mingyu;Hu, Pian;Lan, Lanling;Liu, Yan;Zhou, Jun;Shi, Xiaotao
    • Current Optics and Photonics
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    • v.4 no.5
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    • pp.441-445
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    • 2020
  • A novel design for a Fresnel lens for a solar end-pumped laser is demonstrated in this paper. The new hybrid Fresnel lens includes two parts, inner and outer. The inner part is a twice-total-internal-reflection and vertical-transmission lens. The outer part is a once-total-reflection and vertical-transmission lens. The radius of the Fresnel lens is 600 mm, and its focal length is 750 mm. The concentrating performance of the Fresnel lens is examined using TracePro. The results show that the concentration efficiency has been greatly improved. The total concentration efficiency of the hybrid Fresnel lens reaches 73.2% when the radius of the laser rod is 3 mm. This design can simplify the concentration system of a solar end-pumped solid-state laser.

Optics of the light-weight and foldable telescope based on the Fresnel lens

  • Yu, Hyungjoon;Park, Yong-Sun;Chung, Haeun
    • The Bulletin of The Korean Astronomical Society
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    • v.41 no.1
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    • pp.57.3-58
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    • 2016
  • We analyze an optical system of a telescope based on Fresnel type objective lens as suggested by Hyde (1999). The Fresnel objective lens can be thin, light-weight and foldable, and therefore it is possible to develop a space telescope with an aperture larger than that of traditional telescopes. Moreover a lens, whatever it is either Fresnel type or conventional, allows much larger fabrication tolerances. We design a medium-sized telescope adopting Fresnel lens as an objective lens for use in space and possibly on the ground. The well-known chromatic aberration of the Fresnel primary lens is corrected by a field lens and another Fresnel lens using Schupmann method. An additional lens is used for forming images. We analyze the chromatic and off-axis aberrations of the proposed system analytically and suggest methods for the minimization of off-axis aberrations and for the operation in wider spectral range. We also conduct ray tracing and optimize the whole optical system with commercial software. Finally we present the design parameters of a telescope with an aperture of 0.5 to 1 meters, enabling diffraction limited operation for a moderate field of view about 10 arc-minutes.

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Heat & Cool Injection Molded Fresnel Lens Solar Concentrators (가열-냉각 사출성형 방식을 적용한 집광형 프레넬렌즈)

  • Jeong, Byeong-Ho;Min, Wan-Ki;Lee, Kang-Yeon
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.4
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    • pp.283-289
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    • 2014
  • A Fresnel lens is an optical component which can be used as a cost-effective, lightweight alternative to conventional continuous surface optics. Fresnel lens solar concentrators continue to fulfill a market requirement as a system component in high volume cost effective Concentrating Photovoltaic (CPV) electricity generation. The basic principles of the fresnel lens are reviewed and some practical examples are described. To investigate the performance space of the Fresnel lens, a fast simulation method which is a hybrid between raytracing and analytical computation is employed to generate a cache of simulation data. Injection molders are warming up to the idea of cycling their tool surface temperature during the molding cycle rather than keeping it constant. Heat and cool process are now also finding that raising the mold wall temperature above the resin's glass-transition or crystalline melting temperature during the filling stage and product performance in applications from automotive to packaging to optics. This paper deals with the suitability of Fresnel lenses of imaging and non-imaging designs for solar energy concentration. The concentration fresnel lens confirmed machinability and optical transmittance and roughness measure through manufactured the prototype.

Design and Analysis of Illumination Optical System Using Fresnel Lens (Fresnel Lens를 이용한 조명 광학계의 설계 및 분석)

  • 김미령;김종태
    • Journal of the Korean Printing Society
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    • v.20 no.1
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    • pp.113-122
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    • 2002
  • We designed the illumination optical system to use Fresnel lens which is the most general type of large aperture system. The normal construction of Fresnel lens is a thin molded piece of material, usually some kind of plastic, with one side flat and the other comprising a series of concentric segments each angled in a way to provide for optimum focusing for a pair of conjugate points. The 155 mm Marine Signal Lantern is the approved for use on buoys and a maximum omnidirectional range of 8 nmi, can be obtained with standard 12V equipment, respectively. Finally, Fresnel lens with 155 mm diameter was designed and evaluated. Also, we re-designed groove "out" of Fresnel lens and compared results of groove "in" type with groove "out" type. According to the results, Fresnel lens is obtained best optical results when grooved side faces the longer conjugate.de faces the longer conjugate.

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Micro-replication quality of Fresnel Lens in UV micro-replication process (프레넬 렌즈 UV 미세복제 공정에서의 전사특성에 관한 연구)

  • Lim J.;Lee N.;Kim S.;Kang S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.79-82
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    • 2005
  • Fresnel lens has number of applications in the optical systems because of its advantages. It is nearly flat lens that has small weight. It is conventionally used in lighthouse beacons, condensing unit of overhead projector and etc. Recently, demands of small size optical systems such as display units, information storage systems, optical detecting units had increased. Conventional manufacturing process of high quality Fresnel lens is direct machining. But it is not suitable for mass production because of high cost and long cycle time. Replication process is more suitable for mass production. But the Fresnel lens has number of sharp blade shape prism. In the replication process, this blade shape causes defects that can affect optical efficiency. In this study, replication process of blade shape pattern that has maximum height of $280{\mu}m$, aspect ratio 1.4 for Fresnel lens application.

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Design of LCD Backlight Unit Coupled with Micro Fresnel Lens Array (배열형 소형 프레넬 렌즈가 결합된 LCD 백라이트의 설계)

  • Jeong, Man-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.2
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    • pp.1-7
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    • 2006
  • A light guided plate coupled with the micro Fresnel lens array(MFTA) is designed to improve the efficiency of the LCD backlight unit. Blazed Frenel lens and binary multi-level Fresnel lens are adapted for the MFLA. This type of MFLA can replace the prism sheet and diffuser sheet which are used for the conventional type of the LCD backlight unit. The luminance and uniformity are calculated to verify the performance of the MFLA type LCD backlight unit.

A Study on the Machining of Fresnel Lens Mould (Fresnel 렌즈 금형 가공기술 연구)

  • Je, Tae-Jin;Hwang, Gyeong-Hyeon;Lee, Eung-Suk;Kim, Jae-Gu
    • 연구논문집
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    • pp.105-113
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    • 1995
  • Fresnel lenses are developed for flat optics with the optical characteristics close to aspherical lens such as sharp focusing and dispersion instead of spherical or aspherical surface. Usually, these fresnel lenses and diffraction gratings are machined by high-energy beam such as electron beam machining, but recently with the development of ultra precision machine tool and machining technology, 3-dimension micro machining becomes preferable. This study on the micro machining of fresnel lens is carried out to develop the basic technology of ultra precision micro machining. The machined lens mold will be used for the manufacturing of fresnel lens with 120mm focal distance using synthetic resin material with 1.49 refractive index(PMMA), and the shape of lens is 48mm diameter, $300\mum$ pitch and about $5-700\mum$depth of groove in brass.

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Fresnel lens optics simulation with middle sized linear concentration without secondary optics (2차 광학계가 필요없는 프레넬 렌즈를 이용한 중집광 광학계 시뮬레이션)

  • Kang, Sung-Won;Kim, Yong-Sik;Sim, Chang-Ho
    • 한국태양에너지학회:학술대회논문집
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    • pp.27-33
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    • 2011
  • HCPV(High Concentrated PV) systems have well known for CPV market all over the world. Low concentration type silicon based modules have been introduced in the market. But low cost of standard flat silicon modules made them useless nowadays. High cost of compound semiconductor solar cell reduced cost effective cpv module production than that of recently silicon solar cell. In order to overcome increasing cost of CPV module, we study middle concentration type fresnel lens simulation using concentrated type silicon based solar cell. Linear type fresnel lens made production of CPV module without secondary optics such as light pipe or light tunnel. This type of fresnel lens design makes more cost effective solution for cpv niche market.

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