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

共 444 条记录，以下是221-230 订阅

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Testing and alignment of freeform based multi-mirror telescopes 16

Testing and alignment of freeform based multi-mirror telesco...

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conference on current developments in lens design and optical engineering XVI

作者： Zhang, Xue-jun Hu, Hai-xiang Xue, Dong-lin Li, Ming Chinese Acad Sci Changchun Inst Opt & Fine Mech & Phys Changchun 130033 Jilin Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

ISBN: (纸本)9781628417449

Three Mirror Anastigmat (TMA) systems including both on-axis and off-axis configurations have been widely used in space applications. In some designs, to correct for high order aberrations and realize large FOV, freeform surfaces are used to provide more design freedoms. This trend brings challenges to optical manufacturing and testing community Since testing is critical to make high accurate aspheres and freeform surfaces, the paper addressed Computer Generated Hologram (CGH) design and implement to measure large freeform mirrors. In particular, CGH assisted alignment procedure for TMA telescopes were discussed in detail.

关键词： TMA freeform mirror CGH testing optical alignment

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Color mixing collimating lamp based on RGB LEDs

Color mixing collimating lamp based on RGB LEDs

引用

conference on current developments in lens design and optical engineering XIII

作者： Lo, Yi-Chien Moreno, Ivan Chiu, Bo-Chun Chien, Wei-Ting Cai, Jhih-You Chang, Yu-Yu Sun, Ching-Cherng Natl Cent Univ Inst Lighting & Display Sci Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9780819492036

A novel light luminaire is proposed and experimentally analyzed, which efficiently mixes and projects the tunable light from red, green and blue (RGB) light-emitting diodes (LEDs). Simultaneous light collimation and color mixing is a challenging task because most collimators separate colors, and most color mixers spread the light beam. We performed an experimental study to find a balance between optical efficiency and color uniformity by changing light recycling and color mixing.

关键词： LED color mixing color uniformity optical efficiency luminaire

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Microelectrofluidic lens for Variable Curvature

Microelectrofluidic Lens for Variable Curvature

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conference on current developments in lens design and optical engineering XIII

作者： Chang, Jong-hyeon Lee, Eunsung Jung, Kyu-Dong Lee, Seungwan Choi, Minseog Kim, Woonbae Samsung Adv Inst Technol Micro Syst Lab Yongin 446712 Gyeonggi Do South Korea

ISBN: (纸本)9780819492036

This paper presents a tunable liquid lens based on microelectrofluidic technology which integrates electrowetting and microfluidics. In the novel microelectrofluidic lens (MEFL), electrowetting in the hydrophobic surface channel induces the Laplace pressure difference between two fluidic interfaces on the lens aperture and the surface channel. Then, the pressure difference makes the lens curvature tunable. The previous electrowetting lens in which the contact angle changes at the side wall has a certain limitation of the curvature variation because of the contact angle saturation. Although the contact angle saturation also appears in the surface channel of the MEFL, the low surface channel increases the Laplace pressure and it makes the MEFL to have full variation of the optical power possible. The magnitude of the applied voltage determines the lens curvature in the analog mode MEFL as well as the electrowetting lens. Digital operation is also possible when the control electrodes of the MEFL are patterned to have an array. It is expected that the proposed MEFL is able to be widely used because of its full variation of the optical power without the use of oil and digital operation with fast response.

关键词： Microelectrofluidic lens variable curvature surface channel electrowetting contact angle Laplace pressure

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LED Collimation Module for Time Sequential Back Light System 15

LED Collimation Module for Time Sequential Back Light System

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conference on current developments in lens design and optical engineering XV

作者： Lin, Jou-Hui Lee, Chi-Hung Tai, An-Ching Chen, Yu-Hsuan Ma, Shih-Hsin Feng Chia Univ Dept Photon Wenhwa Rd Taichung 40724 Taiwan Feng Chia Univ Dept Elect Engn Taichung 40724 Taiwan

ISBN: (纸本)9781628412192

In this study, a collimated LED light source has been developed as a colorful liquid crystal display backlight, which is driven by a two-field driving scheme to display color. In each field, the angular rays of two colors from LEDs are collimated by a collimation lens, redirected by a light guide and converged by a cylindrical-lens array to map into corresponding sub-pixel positions for efficiently displaying color image. The simulation results of the backlight module and the corresponding experimental results will be discussed in detail.

关键词： LED Backlight Collimation lens

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Caustic surface produced by a plane wavefront refracted through positive bi-conic lenses. 17

Caustic surface produced by a plane wavefront refracted thro...

引用

conference on current developments in lens design and optical engineering XVII

作者： Ponce-Hernandez, Osvaldo Avendano-Alejo, Maximino Roman-Hernandez, Edwin Moreno-Oliva, Ivan Univ Nacl Autonoma Mexico Ctr Ciencias Aplicadas & Desarrollo Tecnol Apdo Postal 70-186 Mexico City 04510 DF Mexico Univ Istmo Div Estudios Posgrado Campus Tehuantepec Cd Univ S-N Santo Domingo Tehuantepe 70760 Oaxaca Mexico

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

We study the formation of caustic surfaces produced by bi-conic lenses, considering a plane wavefront propagating parallel to the optical axis. We have already seen that the shape of caustic surfaces can represent the monochromatic aberrations that we call image errors, furthermore the shape of the caustic can be modified by changing the parameters of the lens in such a way that if we are able to vanish the caustic, the optical system produces an image without spherical aberration, alternatively caustic surfaces having a large area could be applied to design non-imaging optical systems, such as diffusers of light. The shape of the caustic surface is a function of the indices of refraction involved in the process of refraction, and all the parameters of the bi-conic lens. We provide an analytic equation for the caustic surface in a meridional plane and some examples are presented.

关键词： Ray tracing lenses Protactinium Refraction Wavefronts Geometrical optics Interfaces Monochromatic aberrations optical design Cadmium

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design of an anastigmatic three-mirror telescope using freeform surfaces 11

Design of an anastigmatic three-mirror telescope using freef...

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conference on current developments in lens design and optical engineering XXI

作者： Alvarado-Martinez, J. J. Granados-Agustin, F. S. Vazquez-y Montiel, S. Cornejo-Rodriguez, A. A. INAOE Luis Enrique Erro 1 Sta Maria Tonanzintla Cholula Pue Mexico UIEPA Los Ilanos Kilometro 1 San Andres Tlayehualanci Ahuacatlan Pue Mexico

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

This paper proposes the design of an anastigmatic three-mirror telescope using freeform surfaces for the correction of spherical aberration, coma, astigmatism, and field curvature, allowing a wide field of view (FOV) and high resolution. For the structure of this telescope, it is proposed to use only two optical elements where the primary and tertiary mirrors are integrated into an only optical element and the secondary mirror in the other, thus achieving a considerable reduction in the difficulty of alignment and assembly. To achieve a high performance of the telescope, the system was decentered (off-axis design), avoiding the loss of energy due to the obscuration of the M-2 in the on-axis system. In addition, to solve the difficult access to the focus.

关键词： optical design three-mirror system freeform on-axis system off-axis system

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optical designs for the Mars '03 rover cameras

Optical designs for the Mars '03 rover cameras

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conference on current developments in lens design and optical engineering II

作者： Smith, GH Hagerott, EC Scherr, LM Herkenhoff, KE Bell, JF GHS Opt Pasadena CA 91101 USA

ISBN: (纸本)0819441554

In 2003, NASA is planning to send two robotic rover vehicles to explore the surface of Mars. The spacecraft will land on airbags in different, carefully chosen locations. The search for evidence indicating conditions favorable for past or present life will be a high priority. Each rover will carry a total of ten cameras of five various types. There will be a stereo pair of color panoramic cameras, a stereo pair of wide-field navigation cameras, one close-up camera on a movable arm, two stereo pairs of fisheye cameras for hazard avoidance, and one Sun sensor camera. This paper discusses the lenses for these cameras. Included are the specifications, design approaches, expected optical performances. prescriptions, and tolerances.

关键词： optical engineering lens design cameras Mars JPL

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Integral optical system design of injection molded optics

Integral optical system design of injection molded optics

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conference on current developments in lens design and optical engineering IV

作者： Bäumer, S Shulepova, L Willemse, J Renkema, K Philips High Tech Plast NL-5503 LP Veldhoven Netherlands

ISBN: (纸本)0819450464

Injection molded optics are frequently applied in many high volume applications. Bar code scanners.. CD / DVD systems, CMOS cameras are a few examples. In all of these applications cost effective and fast design cycles are essential. At Philips High Tech Plastics we developed a design system that touches on all different aspects of the system design. Starting with traditional lens design (sequential ray tracing) and tolerancing we transport the initial design into mechanical solid modeling. During mechanical modeling, tolerances, injection molding design rules and integration of mechanical features, reference marks, etc. are incorporated as well. Here the full advantage of injection molding can be utilized. After the opto - mechanical modeling the system is ported back to non - sequential ray tracing for ghost - and stray light analysis. Finally extended tolerancing is performed in order to come to a robust high volume product. If necessary all or several steps in this design process are repeated in order to arrive at the final design. As an additional requirement the metrology possibilities for the design are checked at an early stage. This integral system approach to optical design, including optical modeling (sequential and non-sequential) combined with mechanical solid modeling is presented using some recent examples.

关键词： injection molding imaging optics optics design

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Application of the light field for a simulation to evaluate the MTF of optical lens systems using rendering

Application of the light field for a simulation to evaluate ...

引用

conference on current developments in lens design and optical engineering XIV

作者： Horiuchi, Shuma Yamamoto, Manabu Tokyo Univ Sci Dept Appl Elect Katsushika Ku Tokyo 1258585 Japan

ISBN: (纸本)9780819496911

The modulation transfer function (MTF) in lens systems can be simulated using rendering. Here, the MTF is obtained by rendering test charts with bar target patterns after they are passed through an optical imaging system. The benefit of this method is that it can be applied to shift-variant systems, to which it is difficult to apply the point spread function (PSF), and that it enables the comparison of theoretical results to experimental results when test charts are imaged through an optical imaging system. However, the number of sampled rays must be increased to suppress the variance in the resulting radiance distribution, and the computation time increases proportionally with the number of analyzed spatial frequencies. This report proposes the recording of the light field of light rays, which is a function describing light rays at the entrance pupil. Focused images are compiled for each test chart based on the recorded light field. The time necessary for compilation is significantly shorter than for ray tracing in a lens;therefore, the radiance distribution can be rapidly obtained when the spatial frequency is changed. The methodology to record the light field and the data format are outlined in this report.

关键词： rendering light field modulation transfer function imaging optics

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Low profile optic design for mobile camera using dual freeform reflective lenses

Low profile optic design for mobile camera using dual freefo...

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conference on current developments in lens design and optical engineering VII

作者： Jeong, Ho-Seop Yoo, Ho-Sik Lee, Sang-Hyuk Oh, Hae-Ran Samsung Elect Mech Cent R&D Inst Opt Lab Suwon 443743 South Korea

ISBN: (纸本)0819463671

Aspherical glass or plastic lenses are usually adapted in the camera module of handheld phone. Recently, slimmer cameras are required according to reducing thickness of handheld phone. In this paper, we present an ultra slim camera module using multiple freeform off-axis imaging lenses. New optical concept of multiple lens system introduces the planar optics with freeform. shaped aspherical lens surface on the wafer, which can achieve the thickness of 50% compared to the conventional symmetric lens system. In order to achieve the resolution specification, we separate the field of view in camera module. As the result, two inverted images are produced on a same imaging sensor and the acquired inverted images are processed by photo stitching algorithm so as to combine them. Finally, in order to verify the new imaging system, we manufacture the new slim lens through the LJV embossing replication process. We found the new imaging system is feasible for VGA resolution and it can be expandable to the high resolution system.

关键词： freeform. surface planar integrated optics photo stitching wafer scale lens UV embossing

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