• Title/Summary/Keyword: Lens system design

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A Compact Top-View Conformal Optical System Based on a Single Rotating Cylindrical Lens with Wide Field of Regard

  • Yu, Linyao;Wei, Qun;Zheng, Jinggao;Ge, Mingda;Zhang, Tianyi
    • Journal of the Optical Society of Korea
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    • v.20 no.1
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    • pp.64-69
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    • 2016
  • A new compact conformal dome optical system was established, and the aberration characteristics of the dome were investigated using Zernike aberration theory. The aberrations induced by the dome at different fields of regard (FORs) from 30° to 100° were effectively balanced by a rotating cylindrical lens. This kind of optical system can be widely used in top-view optical searching devices. A design method was introduced and the optimization results analyzed in detail. The results showed that the Zernike aberrations produced by the conformal dome were decreased dramatically. Also, a complete conformal optical system was designed, to further illustrate the aberration correction effect of the rotating cylindrical lens. Using a cylindrical lens not only provided a large FOR, but also simplified enormously the structure of the conformal optical system.

Optical Lens Design of Image Sensor (이미지 센서용 광학렌즈설계)

  • Lee, Chan-Ku;Lee, Su-Dae;Joung, Maeng-Sig
    • Journal of Korean Ophthalmic Optics Society
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    • v.8 no.2
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    • pp.99-103
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    • 2003
  • This paper presents lens optimization of the resolution and the distortion for a four-element lens design. In order to have compact optical system, we used the tele-photo type lens composed of a positive and a negative power elements instead of retro-focus lens. The specifications of optical lens design are the focal length of 7.2 mm, the F/number of 2.8 and the field angle of $54.7^{\circ}C$. The MTF values are higher than 0.5 in the spatial frequency range up to 110 lp/mm for all of the designed object heights. Also, it is expected to fulfill all the requirements of a digital still camera lens and especially suited for building low-cost, compact digital cameras because of the low-profile property of the lens design.

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Development of machining system for ultra-precision aspheric lens mold (초정밀 비구면 렌즈 금형가공시스템 개발)

  • Baek, Seung-Yub;Lee, Ha-Sung;Kang, Dong-Myeong
    • Design & Manufacturing
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    • v.2 no.1
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    • pp.33-38
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    • 2008
  • As consumer in optics, electronics, aerospace and electronics industry grow, the demand for ultra precision aspherical surface lens increases higher. Precision turning with single-diamond tools has a long history of development for fabrication of optical quality surfaces since the advent of aerostatic rotary spindles and precise linear motion guide ways. To enhance the precision and productivity of ultra precision aspherical surface micro lens, the following specification of ultra precision grinding system is required: the highest rotational speed of the grinder is 100,000rpm and its turning accuracy is $0.1{\mu}m$, positioning accuracy is $0.1{\mu}m$. The development process of the grinding system for the ultra precision aspherical surface micro lens for optoelectronics industry is introduced. In the work reported in this paper, an intelligent grinding system for ultra precision aspherical surface machining was designed by considering the factors affecting the surface roughness and profiles accuracy. An aerostatic form was adopted to build the spindle of the workpiece and the spindle of grinder and ultra precision LM guide way was adopted in this system. And this paper deals with mirror grinding of an aspheric surface micro lens by resin bonded diamond wheel and spherical lens of BK7. It results was that a form accuracy of $0.6{\mu}m$ P-V and a surface roughness of $0.006{\mu}m$ Rmax.

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A study on the development of CAD system for the design of lens of the turn signal lamp (자동차 방향지시등 렌즈설계를 우한 CAD 시스템의 개발에 관한 연구)

  • 이재원;이우용
    • Journal of the korean Society of Automotive Engineers
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    • v.15 no.3
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    • pp.89-95
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    • 1993
  • This paper presents the development of CAD system for the design of lens of the Turn Signal Lamp that can model and simulate its optical performance. The system consists of three main modules: skin surface modeling module, inner lens modeling module and optical performance simulation module. Skin surface geometry can be modeled by the input of data file and inner lens can be modeled by the input of only four parameter using its geometric characteristics. Also light distribution pattern, the barometer of optical performance is generated by means of finite ray tracing method. The system display modeled geometry, ray tracing and generated light distribution pattern.

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New Design Method of Stable Lens System Against Chromatic Variation Based on Paraxial Ray Tracing

  • Lee, Jong-Ung
    • Current Optics and Photonics
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    • v.4 no.1
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    • pp.23-30
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    • 2020
  • This paper presents a new method for designing a lens system stable against chromatic variation at a specified wavelength. Conventional lenses are corrected for chromatic aberration, but the new method suppresses chromatic changes of the marginal ray in the image-side. By doing so, paraxial properties of the lens system are stabilized against chromatic variation. Since the new method is based on paraxial ray tracing, the stabilizing conditions against chromatic variation are given by recurrence formulas. However, there is an analytic solution for the case of a cemented doublet in the air. A stable doublet at 405 nm wavelength is designed and analyzed.

Optical System Design Composed of Spherical SELFOC Lens and Aspherical Plastic Lens for Mobile Phone Camera (1매의 구면 SELFOC 렌즈와 1매의 비구면 플라스틱 렌즈로 구성된 카메라폰용 광학계의 설계)

  • Lee, Yong-Sun;Lee, Jong-Ung
    • Korean Journal of Optics and Photonics
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    • v.19 no.2
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    • pp.108-115
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    • 2008
  • We designed optical systems for a mobile phone camera using a spherical SELFOC lens and an aspherical plastic lens. Since the radial index distribution gives an additional design parameter for optical design, an aspheric lens could be replaced by a spherical lens. The imaging performances of the design were compared with conventional 2P design composed of two aspherical plastic lenses. In the first stage of study, we designed 1GRIN 1P lenses by using commercially available SELFOC materials. But, the conventional 2P lenses had better performance than the 1GRIN 1P lenses. In the 1GRIN 1P designs, the performance depends on index variation of GRIN material, the larger variation gives the better performance. Hence, we tried to design by using fictitious GRIN materials which have large index variation. We found if the index variation could be increased to about 3 times that of currently available SELFOC materials, the 1GRIN 1P lens will have equivalent or better performance than the conventional 2P design.

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.

Optical Design and Optimization of a Micro Zoom System with Liquid Lenses

  • Zhang, Wei;Li, Dan;Guo, Xin
    • Journal of the Optical Society of Korea
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    • v.17 no.5
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    • pp.447-453
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    • 2013
  • A micro zoom system without moving elements by use of two liquid lenses is designed and optimized in this paper. The zoom equations of the system composed of two liquid lenses are deduced. The structure parameters including radius and thickness of a conical double-liquid electrowetting based lens are analyzed and calculated. Because the liquid thickness varies non-linearly with the radius of the interface, it's very difficult to optimize a real liquid lens using commercial optical design software directly. Through the Application Programming Interface (API) of the optical design software CODE V, a zoom system with two real electrowetting based liquid lenses is modeled and optimized. A two-liquid-lens zoom system without moving elements, with a zoom factor of 1.8 and a compact structure of 10 mm is designed for illustration. This can be useful for the camera design of mobile phones, tablets and so on. And this paper presents a convenient way of designing and optimizing a zoom system including liquid lenses by commercial optical design software.

Optical Illumination System Design for LED Masthead Navigation Light (LED 광원을 이용한 마스트 항해등 조명광학계 개발)

  • Maeng, Pil-Jae;Jang, Jae-Hyeon;Kim, Kun-Yul;Yu, Young-Moon;Kim, Jong-Su;Kim, Jong-Tae
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.8
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    • pp.24-31
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    • 2014
  • This paper dealt with the LED optical illumination system design for the Masthead navigation light to replace halogen lamps. We made Fresnel lens satisfy luminous intensity distribution of "Convention on the International Regulation for Preventing Collisions at Sea(COLREG)". The optical system is designed by classifying three parts: light source, lens, and cut off plate. The source of light has been made to have the uniform horizontal and vertical light distribution by placing 6 LEDs at intervals of $54^{\circ}$, and as the cylindrical Fresnel lens, the lens has been designed to achieve the uniform horizontal and vertical light distribution in the range of plain light. Finally, the cover has been designed to block the light from the outside of plain light and ultimately met the standards for light distribution of navigation lights. In addition, the validity of design has been verified with manufacturing a trial product.

Theoretical and Numerical Lens Design Using Near Field Theory for High Density Storage Device (근접장 이론을 이용한 고밀도 저장 장치용 렌즈의 이론적 설계와 수치적 설계)

  • 이문도;박재혁;박노철;박영필
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.9
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    • pp.173-179
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    • 2003
  • In optical storage device system, there are several research topics to increase its recording density. The main idea is reducing wave length of laser diode and magnifying the number of numerical aperture (NA). In conventional optical system NA cannot be over the unity in the air because of its diffraction limit. But it is possible to overcome its limitation of unity in near field using Solid Immersion Lens. In this work, the mathematical Solid Immersion Lens (SIL) design process was illustrated by using near field theory. Also, numerical SIL design parameters were calculated by means of CODE V. Through the work, we propose the new type of SIL for high density optical recording systems.