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检索条件"任意字段=Current Developments in Lens Design and Optical Engineering IX"

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Exact analytical astigmatic function of aspherical surfaces

Exact analytical astigmatic function of aspherical surfaces

引用

SPIE optical engineering + Applications

作者： Hristov, B.A. Central Laboratory of Optical Storage and Processing of Information Bulgarian Academy of Sciences P.O.Box 95 Sofia 1113 Bulgaria

ISBN: (纸本)9780819477187

We derive an exact analytical image astigmatic function for aspherical and hyper-aspherical surfaces of arbitrary shape that describes correctly (without any approximations) image astigmatism for the whole object space and investigate this function for two general cases: in the presence and in the absence of object astigmatism. So we discover the boundary astigmatism correction ability of aspherical surfaces. We prove that in general there are two anastigmatic points on each chief ray in every aspherical surface. We find as well analytical expressions for anastigmatic and extreme points of the function and its vertical and horizontal asymptotes. As a result we prove that in the object and image space of every refracting aspherical surface at each stop position there are two pairs of anastigmatic surfaces one of them coincides with the refracting surface itself. In the object and image space of every reflecting aspherical surface at each stop position there is in general one anastigmatic surface which coincides with the reflecting surface itself. There are special cases when the whole space of the reflecting aspherical surface is anastigmatic. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： optical design

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optical system module having zooming function and image quality of mega pixel for a cellular phone camera

Optical system module having zooming function and image qual...

引用

SPIE optical engineering + Applications

作者： Park, Seong Jong Lee, Jong Jin Chung, Chang Sub Vision Optics Lab. Suncheon Cheongam College Suncheon 540-743 Korea Republic of Optoelectronics Technological Institute KOLEN Co. Seongnam 462-807 Korea Republic of Department of Physics Chonnam National University Kwangju 500-757 Korea Republic of

ISBN: (纸本)9780819477187

We designed and developed a cellular phone camera like HD digital still camera having zooming function. To design an optical system module having the auto-zooming and the image quality of 2M mega pixel using Code V, we considered 6 lenses which were four aspheric plastic lenses and two glass lenses. The specifications of designed optical system module for a cellular phone camera were the focal length of 4.29mm at wide position to 10.55mm at tele position, fnumber of 3.2 at wide position to 5.3 at tele position, and field of view of 27.4 degree at tele position to 65.8 degree at wide position. Its zoom ratio was 2.5. The values of modulation transfer function (MTF) at 200lp/mm of the designed optical system module were over 21% at zoom position. We applied the design results of optical system module to the fabrication of a cellular phone camera having the zoom ratio of 2.5 and the image quality of 2M mega pixel, and adopted the aspheric glass lens having higher abbe number to compensate chromatic aberration and the VCM (Voice Coil Motor) as sub-miniature motor. We fabricated the optical module system having zoom ratio of 2.5 and image quality of 2M mega pixel in order to apply to a HD cellular phone camera. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： optical systems

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New tools for the lens designer

New tools for the lens designer

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Conference on current developments in lens design and optical engineering ix

作者： Dilworth, Donald C. Optical Systems Design Inc. (United States)

ISBN: (纸本)9780819472809

Several common impediments to successful lens design can be removed by application of new techniques. These involve using information that has long been calculated during the design process, but then discarded. Problems so addressed include the nuisance of discovering ray failures in the starting configuration, and that of tolerance desensitization, among others.

关键词： lens optimization ray failures tolerance desensitization starting point stop position avoiding strain

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optical design of reflective wide-field cameras

Optical design of reflective wide-field cameras

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Conference on current developments in lens design and optical engineering ix

作者： Sasian, Jose Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9780819472809

This paper discusses some methodologies that apply to the optical design of reflective wide-field cameras. Among the methods considered are off-axis and eccentric pupil systems, concatenation of systems, tilted component systems, aberration theory, and confocal systems. The goal of the paper is to review design methods. In particular some systems are shown to illustrate two methodologies.

关键词： optical design mirror design wide-field reflective optics unobscured

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An optically passive athermal infrared optical system

An optically passive athermal infrared optical system

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Conference on current developments in lens design and optical engineering ix

作者： Li, Hua Shen, Mangzuo Chinese Acad Sci Inst Opt & Elect Chengdu 610041 Sichuan Prov Peoples R China

ISBN: (纸本)9780819472809

An optically passive athermal infrared optical system working in the 8 - 12 micron long wavelength infrared band was designed by using a special infrared optical material AMTIR (amorphous material transmitting infrared radiation). The design principle, design results are described in this paper. In addition, the optical system was incorporated with an infrared focal plane array forming an infrared camera. The thermal test of imaging quality of this camera is also presented

关键词： infrared optical system optical design athermal optical system

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Day and Night Security Camera

Day and Night Security Camera

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Conference on current developments in lens design and optical engineering ix

作者： Laikin, Milton Kweon, Gyeong-il Choi, Young-ho Laikin Opt Corp 4314 Marina City Dr 930 Marina Del Rey CA 90292 USA Honam Univ Dept Optoelect Gwangju 506090 South Korea Honam Univ Dept Informat & Commun Engn Gwangju 506090 South Korea

ISBN: (纸本)9780819472809

We have designed a fisheye lens with a field of view of 190 degrees and F# of 2.8 The diameter of the circular image plane is designed to fit within the width of the image sensor plane, so that a 190 degrees horizontal field of view can be obtained. It is composed of 8 spherical lens elements and the overall length is 35mm from the first lens surface to the image sensor plane. This fisheye lens operates simultaneously in the visible and the near infrared wavelength regions.

关键词： lens design near infrared visual wide-angle lens

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design Efficiency of 3188 optical designs

Design Efficiency of 3188 Optical Designs

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Conference on current developments in lens design and optical engineering ix

作者： Cakmakci, Ozan Rolland, Jannick P. Thompson, Kevin P. Rogers, John Univ Cent Florida CREOL Coll Opt & Photon Orlando FL 32816 USA Opt Res Associates Pasadena CA USA

ISBN: (纸本)9780819472809

In this study, we take a data-driven approach to study the design efficiency of a variety of optical designs. Efficiency is defined to be the number of resolvable spots across the image per lens element. 3188 designs were selected from a commercially available lens database. Each design was imported into a raytrace code, briefly optimized, and the number of resolvable spots was computed. Examples of efficient designs within this dataset are shown. Four design efficiency groupings are created and discussed separately: 1) all-spherical, monochromatic designs, 2) monochromatic designs with some aspheres, 3) all-spherical, polychromatic designs, and 4) polychromatic designs with some aspheres. Zoom lens systems were excluded from the dataset. The results of the analysis are intended to answer the question of "how many elements does it take, as a minimum, to deliver a certain number of resolved spots?"

关键词： optical system design efficiency database analysis

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Automated design and fabrication of ocular optics

Automated design and fabrication of ocular optics

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Conference on current developments in lens design and optical engineering ix

作者： Gutin, Mikhail Gutin, Olga Appl Sci Innovat Inc Troy NY 12180 USA

ISBN: (纸本)9780819472809

Automated computer-aided procedure for component selection, optical design, and optimization was developed and used to produce prototype ocular optics of a head-mounted display for biomedical imaging, with the field of view and resolution approaching those of normal human vision. The new display has the potential to dramatically increase the amount and fidelity of real-time visual information presented to the user. The selected approach was based on a tiled configuration and "optically stitched" virtual image, resulting in seamless imagery generated by multiple micro-displays. Several optical configurations were studied in the design stage, to arrive at the optimal optical layout. The automated procedure provided for extensive search of the best candidate stock components out of thousands of candidate lenses offered by different vendors. At each iteration, the candidate lens was "digitally inserted" in the optical layout, its position was optimized, and the achieved merit function characterizing the quality of the stitched image was stored, along with the design prescription. A few best designs were then closely evaluated in a traditional "manual" procedure. The design effort was followed by experimental demonstration and tests of a limited prototype optical system.

关键词： optical design lens design head mounted display HMD

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design and fabrication of low-cost thermal imaging optics using precision chalcogenide glass molding

Design and fabrication of low-cost thermal imaging optics us...

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Conference on current developments in lens design and optical engineering ix

作者： Curatu, George LightPath Technol Orlando FL 32826 USA

ISBN: (纸本)9780819472809

Aspheric and diffractive surfaces in infrared materials are traditionally fabricated by single point diamond turning, which is a high-cost, low-throughput process, not suitable for low-cost, high-volume applications. Precision molding of chalcogenide glasses is a novel process we developed to allow the efficient fabrication of quality infrared optics in large volumes. In this paper we present the advantages and particularities of designing thermal imaging lenses for high-volume applications using precision molded chalcogenide glasses. As an example, we present a compact 19 mm F/1.1 infrared lens design for a 320 x 240 uncooled detector array operating from 8 to 14 microns. The excellent image quality and transmission of tested prototypes prove that precision molding of chalcogenide glasses is an ideal optical fabrication technology for the high-volume production of infrared optics.

关键词： infrared lens design thermal imaging precision glass molding chalcogenide glasses athermal design diffractive optics

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Five lens corrector for Cassegrain-form telescopes.

Five lens corrector for Cassegrain-form telescopes.

引用

Conference on current developments in lens design and optical engineering ix

作者： Ackenriann, Mark R. McGraw, John T. Zimmer, Peter C. Sandia Natl Labs Livermore CA 94550 USA Univ New Mexico Albuquerque NM 87131 USA

ISBN: (纸本)9780819472809

Refractive elements are commonly used on Cassegrain-form telescopes to correct off-axis aberrations and both widen and flatten the field. Early correctors used two lenses with spherical surfaces, but their performance was somewhat limited. More recent correctors have three or four lenses with some including at least one aspheric surface. These systems produce high resolution images over relatively wide fields but often require the corrector and mirrors to be optimized together. Here we present a new corrector design using five spherical lenses. This approach produces high image quality with low distortion over wide fields and has sufficient degrees of freedom to allow corrector to be optimized independent of the mirrors if necessary.

关键词： Survey telescope wide-field corrector Cassegrain Ritchey-Chretien

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