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SPIE optical engineering + Applications

作者： Rockwell, Ken *** Post Office Box 8778 San Diego CA 92038-8778 United States

ISBN: (纸本)9780819477187

Because optical performance has increased so far with modern design software and aspherical manufacturing processes, optical performance is now the least important factor in modern photographic lens design. Far more important are ergonomic (usability) and systems-integration factors which determine a lens' acceptance by photographers, and ultimately, its commercial success. Common SLR cameras tend to have the most advanced systems and features, so they tend to be the focus of this paper simply because they offer the most to discuss. Inside-the-barrel optics and other design considerations have been covered in SPIE paper 7428-3. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Bandpass filters

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Point symmetric design approach to a wide-field, wide-wavelength cat's eye retro-reflector anastigmat

Point symmetric design approach to a wide-field, wide-wavele...

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SPIE optical engineering + Applications

作者： Liepmann, Till W. Optical Telescope Element Systems Engineering James Webb Space Telescope Northrop Grumman Redondo Beach CA 90278 United States

ISBN: (纸本)9780819477187

A point symmetric design approach for creating a practical cat's eye retro-reflector (CERR) anastigmat lens with a wide field of regard (FOR), uniform reflectance and wide wavelength range is described. An anastigmat design is presented that demonstrates the performance capability of the design approach. The lens design is diffraction limited in double pass at F/3, has a "working distance" between lens and reflector, wide wavelength range of operation, and uniform reflectivity over a 120 deg FOR. An anastigmat fabricated from the design is presented;however, the design approach is generally useful for any application requiring a high performance retro-reflector. The design uses only spherical surfaces, thereby avoiding the fabrication expense of aspheric surfaces. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Reflection

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Exact analytical design method for paraxial chromatic correction in axis-symmetric optical systems

Exact analytical design method for paraxial chromatic correc...

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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 and investigate an exact analytical paraxial longitudinal chromatic function for axis-symmetric optical systems. We prove the existence of two conjugate pairs of achromatic points in the object and image space of every centered optical system (in general they are two, but in some cases they can be missing or their number can be one or infinite-dimensional) and derive formulae for determination of their position in object and image spaces. On the base of this function we develop an exact analytical design method for paraxial chromatic correction in axis-symmetric optical systems. In addition we show some examples. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： optical design

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Finding order in the design landscape of simple optical systems

Finding order in the design landscape of simple optical syst...

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SPIE optical engineering + Applications

作者： Van Grol, P. Bociort, F. Van Turnhout, M. Delft University of Technology Optics Research Group Lorentzweg 1 NL - 2628 CJ Delft Netherlands

ISBN: (纸本)9780819477187

Contrary to the frequent tacit assumption that the local minima of a merit function are points scattered more or less randomly over the design landscape, we have found that, at least for simple imaging systems (doublets with three and triplets with five variables) all design shapes we have observed thus far form a strictly ordered set of points, the "fundamental network". The design shapes obtained for practical specifications with global optimization algorithms are a subset of the set of local minima in the fundamental network and are organized in a way that can be understood on the basis of the fundamental network. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Global optimization

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Auto-focus imaging systems with MEMS deformable mirrors

Auto-focus imaging systems with MEMS deformable mirrors

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SPIE optical engineering + Applications

作者： Lin, Meng-Hsuan Hsieh, Hsin-Ta Hsu, Wei-Yao Cheng, Yuan-Chieh Wu, Cheng-Hsien Su, Guo-Dung J. National Taiwan University Graduate Institute of Photonics and Optoelectronics Taipei Taiwan Instrument Technology Research Center Hsinchu Taiwan National Kaohsiung University of Applied Sciences Kaohsiung Taiwan

ISBN: (纸本)9780819477187

Miniaturization is the key point to design image system for portable devices. Motor-driven lens technique is the traditional way to achieve auto-focus and zoom functions. Nevertheless, systems with moving parts are difficult to downscale. A solution presented in this paper has more potential to downscale and maintain high optical performance simultaneously by combining reflective optics and MEMS deformable mirror. The system we designed with MEMS deformable mirror is a 2M pixel auto-focus image system which is only 5.4mm in thickness before packaging and 6.7mm in thickness after packaging. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Mirrors

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Efficient design process for the evaluation and control of flare in opto-mechanical systems

Efficient design process for the evaluation and control of f...

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SPIE optical engineering + Applications

作者： Zollers, Michael W. Tamkin, John M. Gregory, G. Groot Optical Research Associates 1800 W. Park Dr. Westborough MA 01581 United States Optical Research Associates 3280 E. Foothill Blvd. Pasadena CA 91107 United States

ISBN: (纸本)9780819477187

Even the best optical designs can be ruined by unwanted light: flare in the form of ghost images and veiling glare. The analysis of stray light in an opto-mechanical system is a step in the design process that is often limited to ghost image analysis by the optical designer. In many large design groups, stray light analysis is traditionally performed by optical engineers with very specialized analysis tools that are difficult to master. However, recent improvements in software packages are now offering tools that allow less experienced designers access to tool sets that can perform flare and veiling glare analysis for a substantial subset of optical design problems. This paper outlines an effective and efficient design process for determining the types and magnitudes of stray light in an optical system and demonstrates its use on an injection molded plastic lens assembly. We describe a capability that locates all of the optical paths and their relative magnitudes through an optical system and separates them into one of three categories: image path, ghost paths, or veiling glare. We then describe how to leverage this information to determine the most effective removal method for the "worst offenders". © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Injection molding

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design and optimization of a collimating optical system for high divergence LED light sources

Design and optimization of a collimating optical system for ...

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SPIE optical engineering + Applications

作者： Vidal, E. Otaduy, D. González, F. Saiz, J.M. Moreno, F. Fundación Tekniker Avda. Otaola 20 20600 Eibar Guipúzcoa Spain Universidad de Cantabria Applied Physics Department Avda. de los Castros s/n 39005 Santander Spain

ISBN: (纸本)9780819477187

This paper presents the design of an efficient collimating optical system for an extended light source, namely a highbrightness high divergence light emitting diode (LED), sized 1x1mm, and viewing angle of 130°. The design lies in a catadioptric rotationally symmetrical system, which modeling and optimization has been done by specific optical design software, ZEMAX®, and its development was based on geometrical principles. The device consists of two optical systems, one for the rays emerging from the source with low numerical apertures (NA0.26. The system for rays with low NA consists of an aspherical lens system which parameters are optimized by means of standard criterion for collimation. The system for high NA rays is a combination of a hyperbolic and a parabolic mirror, being the first one the only surface shared by both system (refractive near-axis, reflective offaxis). The result of this work is a system that reaches a collection efficiency of 80% of the LED emitted light. Moreover, the beam collimation quality has been analyzed obtaining a residual divergence of less than 2°. Thus, the results achieved by the proposed optical system improve those obtained with several commercially available devices and other previously proposed systems. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： optical design

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Display systems and registration methods for mixed reality applications

Display systems and registration methods for mixed reality a...

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SPIE optical engineering + Applications

作者： Weng, Dongdong Wang, Yongtian Liu, Yue Chen, Jing Cheng, Dewen School of Optoelectronics Beijing Institute of Technology China

ISBN: (纸本)9780819477187

Mixed reality technologies have been studied for many years, which now can be applied in many aspects of our daily life. Generally, appropriate display devices and registration methods are the key factors for the successful application of the mixed reality system. In the past decade, various types of display systems have been developed at Beijing Institute of Technology, and many of them have been successfully employed in different mixed reality applications. In this paper, we give a brief introduction to the various display systems and their corresponding tracking approach developed and realized at Beijing Institute of Technology for mixed reality applications. These technologies include an interactive projection system based on motion detection, a fixed-position viewing system, an ultra-light wide-angle head-mounted display system and a volumetric 3D display system. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Mixed reality

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design of moving magnet type pickup actuator using inserted coil

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MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOsystems-INFORMATION STORAGE AND PROCESSING systems 2009年第1-11期15卷 1719-1728页

作者： Song, Myeong-Gyu Kim, Yoon-Ki Park, No-Cheol Yoo, Jeonghoon Park, Young-Pil Onagi, Nobuaki Akanuma, Goichi Yonsei Univ CISD Seoul 120749 South Korea Ricoh Co Ltd Mfg Technol R&D Ctr Tsuzuki Ku Yokohama Kanagawa 2240035 Japan Ricoh Co Ltd Adv Technol R&D Ctr Tsuzuki Ku Yokohama Kanagawa 2240035 Japan

Recently, the demand of the information storage devices with large storage capacity such as Blu-ray Disc and high-definition television is increased. In keeping with this trend, the optical storage devices are also required to have high data transfer rate and large storage capacity. To satisfy these requirements, the actuator for optical disc drive should have a high servo bandwidth to compensate the vibration of optical disc. The servo bandwidth is limited by some flexible modes of the actuator, thus it is essential to make these frequencies of flexible modes to high frequency region. The frequency of flexible mode depends on materials and shape. Stiff materials and simple shape is useful to increase the frequency of flexible mode. In this paper, we suggested a moving magnet type actuator having flexible modes which are happened at high frequency region. Generally, the moving magnet type actuator has an advantage to increase the frequency of flexible mode because the moving magnet type actuator has simple structure and the Young's modulus of magnet is high. However, large moving mass and inefficiency of Electromagnetic (EM) circuit cut down driving sensitivities of actuator. To improve driving sensitivities, we designed the model with the closed EM circuit for tracking actuation. The design of experiments (DOE) procedure is applied to get proper design parameters and the variable metric method (VMM) which is a technique of optimization is used to improve driving sensitivity. The lens holder is also improved based on the optimization result of EM circuit. And to make up for the low efficiency of EM circuit, the thermal stability is checked on condition that the input current is very high. At last, the final design of moving magnet type actuator is suggested and it is verified that the driving performance and the structural stiffness of the final design is sufficient.

关键词： Data transfer

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An optical switch of natural light guiding system based on cubic structure with Fresnel surface

An optical switch of natural light guiding system based on c...

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SPIE optical engineering + Applications

作者： Chou, Kao-Hsu Chen, Yi-Yung Whang, Allen Jong-Woei Photonics System Simulation and Design Laboratory Department of Electronic Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Photonics System Simulation and Design Laboratory Department of Electro-Optical Engineering National Taiwan University of Science and Technology #43 Sec. 4 Keelung Rd. Taipei 106 Taiwan

ISBN: (纸本)9780819477187

Recently, many researches focus on illumination with sunlight for saving energy and healthy lighting. A Natural Light Guiding System has collecting, transmitting, and lighting parts. In most systems, the paths on transmitting part are fixed so the collected sunlight of the Natural Light Guiding System can not be free managed and is sometime wasted. In this paper, we design an optical switch to change the path of the collected sunlight on the transmitting sunlight. The switch is cubic structure that includes a 45 degree mirror for reflecting sunlight. According to the structure of the optical switch, we can rotate the switch to manage the path of the collected sunlight. When the path is parallel with the mirror, the sunlight will pass through the switch;and when the included angle between the path and mirror is 45 degree, we can change the path of light. For coupling the exit beam into lightpipe, we design the surfaces of cubic structure to be aspheric surface with Fresnel surface. Finally, we simulate the efficiency of the optical switch when the path is changed by the mirror. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Lighting

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