Browsing by Author "Sun, Wen-Shing"

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Compact LED projector design with high uniformity and efficiency
(2014-10-10)
Sun, Wen-Shing
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Tien, Chuen-Lin
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Ma, Chao-Hui
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Pan, Jui-Wen
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光電系統研究所
The aim of this study is to design a compact LED projector that is divided into two systems: an illumination system and an imaging optical system. The illumination system consists of an RGB LED light source with a collimator lens group and a mirror with a color filter and a lens array integrator instead of an integrated rod so as to improve the uniformity of the light intensity. By using a new total internal reflection prism and projection lens, the whole optical engine is smaller in size and has a higher contrast ratio for image quality. The imaging optical system consists of a total of eight lenses (six spherical lenses and two aspherical lenses), for a total length of 52 mm; a tolerance analysis is conducted. Optical simulation software is used for the system analysis in order to determine the efficiency and uniformity of the light intensity. In this design, the uniformity of the screen reaches more than 82%, and the efficiency increases by more than 44%. (C) 2014 Optical Society of America
Double biprism arrays design using for stereo-photography of mobile phone camera
(2016)
Sun, Wen-Shing
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Chu, Pu-Yi
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Chao, Yu-Hao
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Pan, Jui-Wen
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Tien, Chuen-Lin
Generally, mobile phone use one camera to catch the image, and it is hard to get stereo image pair. Adding a biprism array can help that get the image pair easily. So users can use their mobile phone to catch the stereo image anywhere by adding a biprism array, and if they want to get a normal image just remove it. Using biprism arrays will induce chromatic aberration. Therefore, we design a double biprism arrays to reduce chromatic aberration.
Dual view capsule endoscopic lens design
(2015-04-06)
Sheu, Ming-Jen
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Chiang, Che-Wen
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Sun, Wen-Shing
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Wang, Jhi-Joung
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Pan, Jui-Wen
A dual view capsule endoscopic (DVCE) lens is proposed with front view and back view functions. This is a hybrid lens with a catadioptric mirror and an aspherical surface to support both view functions. The field of view (FOV) for the front view function is 90 degrees. The FOV for the back view function is 260 to 290 degrees. The TV distortion for the front view and back view function is under 30% and 25%. The corner relative illuminations for the two view functions are above 0.53. The Modulation Transfer Function (MTF) performance at the Nyquist Frequency for the two view functions can be kept above 0.35, even under tolerance they can remain above 0.2. Moreover, the telecentric conditions at the image plane of the DVCE system can support constant magnification through focusing. This condition can reduce the measurement error by slightly defocusing of the lens. Thus, the two view functions can offer physicians a wide viewing angle to deal with lesions over the fold. (C)2014 Optical Society of America
Integration of Non-Lambertian LED and Reflective Optical Element as Efficient Street Lamp
(2010-06-21)
Pan, Jui-Wen
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Tu, Sheng-Han
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Sun, Wen-Shing
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Wang, Chih-Ming
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Chang, Jenq-Yang
A cost effictive, high throughput, and high yield method for the increase of street lamp potency was proposed in this paper. We integrated the imprinting technology and the reflective optical element to obtain a street lamp with high illumination efficiency and without glare effect. The imprinting technique can increase the light extraction efficiency and modulate the intensity distribution in the chip level. The non-Lambertian light source was achieved by using imprinting technique. The compact reflective optical element was added to efficiently suppress the emitting light intensity with small emitting angle for the uniform of illumination intensity and excluded the light with high emitting angle for the prevention of glare. Compared to the conventional street lamp, the novel design has 40% enhancement in illumination intensity, the uniform illumination and the glare effect elimination. (C) 2010 Optical Society of America
Micro-prism type single-lens 3D aircraft telescope system
(2012-11-01)
Deng, Qing-Long
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Chen, Chien-Yue
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Cheng, Shun-Wen
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Sun, Wen-Shing
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Lin, Bor-Shyh
Based on the image payload on an Unmanned Aircraft System, this study utilizes a micro-prism array and single-lens remote camera to assess the feasibility of having two virtual cameras shoot terrain image pairs with inclined +/- 10 degrees. The software, LightTools, is applied for simulating and verifying the feasibility of the optical system. In comparison with traditional frame-type remote cameras, this study not only could acquire highly overlapped stereoscopic image pairs from different viewing angles, but could also increase the stereoscopic image pairs by two times. The system we propose obtains more stereoscopic digital terrain information than do traditional systems. (C) 2012 Elsevier B.V. All rights reserved.
Non-telecentric projection lens design for an LED projector
(2017-01-20)
Sun, Wen-Shing
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Pan, Jui-Wen
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光電系統研究所
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Institute of Photonic System
A newly designed non-telecentric projection zoom lens is proposed for a mini-projector with LED light sources. The projection lens consists of six spherical lenses. The zoom ratio of the projection lens is 1.1. At the wide condition, the working F/# can maintain at 2.4 and the throw ratio can operate at 1.23. The root mean square (RMS) spot sizes of all fields are smaller than 15 mu m for all zoom ranges. The optical distortion and the TV distortion were suppressed to be smaller than 1.5% and 1%, respectively. For the image quality issue, the modulation transfer function (MTF) value for all fields is above 0.4 at 46 lp/mm for all zoom conditions. Even when the tolerance error was considered, the MTF value for all fields is still above 0.3 for all zoom conditions. Using this non-telecentric projection zoom lens, a very sharp image could be achieved with low cost. This low cost projection lens is very suitable for business applications. (C) 2017 Optical Society of America
Optimization design of periscope type 3X zoom lens design for a five megapixel cellphone camera
(2016-01-01)
Sun, Wen-Shing
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Tien, Chuen-Lin
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Pan, Jui-Wen
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Chao, Yu-Hao
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Chu, Pu-Yi
This paper presents a periscope type 3X zoom lenses design for a five megapixel cellphone camera. The configuration of optical system uses the right angle prism in front of the zoom lenses to change the optical path rotated by a 90(circle) angle resulting in the zoom lenses length of 6 mm. The zoom lenses can be embedded in mobile phone with a thickness of 6 mm. The zoom lenses have three groups with six elements. The half field of view is varied from 30(circle) to 10.89(circle), the effective focal length is adjusted from 3.142 mm to 9.426 mm, and the F-number is changed from 2.8 to 5.13.
Panoramic stereo photography based on single-lens with a double-symmetric prism
(2013-04-08)
Chen, Chien-Yue
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Deng, Qing-Long
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Sun, Wen-Shing
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Cheng, Qiao-Yao
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Lin, Bor-Shyh
Different from traditional panorama stereo acquisition technique shooting with numerous cameras, this study equips a double-symmetric prism in front of a single-lens camera to acquire images from four different angles of view, and the images acquired from the cameras every 20 degrees complete a pair of panorama stereo images with vertical angle of view (+/- 16 degrees) by image-based rendering. The panorama stereo acquisition technique reduces the number of cameras by three-fourth, and the acquired images contain vertical angles of view. Moreover, the image resolution is enhanced several times of the resolution of integral photography without moire effect. (C)2013 Optical Society of America
Simulation and comparison of the illuminance, uniformity, and efficiency of different forms of lighting used in basketball court illumination
(2014-10-10)
Sun, Wen-Shing
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Tien, Chuen-Lin
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Tsuei, Chih-Hsuan
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Pan, Jui-Wen
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光電系統研究所
We simulate and compare the illuminance, uniformity, and efficiency of metal-halide lamps, white LED light sources, and hybrid light box designs combining sunlight and white LED lighting used for indoor basketball court illumination. According to the optical simulation results and our examination of real situations, we find that hybrid light box designs combining sunlight and white LEDs do perform better than either metal-halide lamps or white LED lights. An evaluation of the sunlight concentrator system used in our inverted solar cell shows that the energy consumption of stadium lighting can be reduced significantly. (C) 2014 Optical Society of America
Simulation and Comparison of the Lighting Efficiency for Household Illumination with LEDs and Fluorescent Lamps
(2013-10-01)
Sun, Wen-Shing
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Tien, Chuen-Lin
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Pan, Jui-Wen
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Yang, Tsung-Hsun
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Tsuei, Chih-Hsuan
The design of the LEDs lighting in general household illumination was proposed and compared with the fluorescent lighting in this study. Using the LED as a light source would promote energy saving lighting for household illumination purposes. We used the LightTools and DIALux software to design and simulate different standards of illuminance, different correlated color temperatures and different color rendering indices for household environments. The power consumption and efficiency of traditional illuminated light sources and an LED light source with the same standard of illuminance for lighting the household environment were analyzed and compared with each other. Finally, our results show the advantages of using white-light LEDs for lighting and household illumination.
Simulation and Comparison of the Lighting Efficiency for Household Illumination with LEDs and Fluorescent Lamps
(2013-10-01)
Sun, Wen-Shing
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Tien, Chuen-Lin
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Pan, Jui-Wen
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Yang, Tsung-Hsun
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Tsuei, Chih-Hsuan
The design of the LEDs lighting in general household illumination was proposed and compared with the fluorescent lighting in this study. Using the LED as a light source would promote energy saving lighting for household illumination purposes. We used the LightTools and DIALux software to design and simulate different standards of illuminance, different correlated color temperatures and different color rendering indices for household environments. The power consumption and efficiency of traditional illuminated light sources and an LED light source with the same standard of illuminance for lighting the household environment were analyzed and compared with each other. Finally, our results show the advantages of using white-light LEDs for lighting and household illumination.
Simulation design of a wearable see-through retinal projector
(2015-05-10)
Sun, Wen-Shing
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Tien, Chuen-Lin
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Chiang, Yen-Chen
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Pan, Jui-Wen
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光電系統研究所
This study proposes a new simulation design for a wearable see-through retinal projector combined with a compact camera. The see-through retinal projector is composed of an illumination system and eyepiece system. In this eyeglass-mounted design, all the information is projected directly into the user\'s eyes using a see-through retinal projector. The retinal projector forms a 20 in. (50.8 cm) upright virtual image located 2 m in front of the human eye, and the illumination system provides uniform illumination for liquid crystal on silicon (LCoS) panels. Moreover, an RGB LED array is used as the light source to generate color images with color sequences. The compact camera has a lens with an aperture of F/2.8, a half field-of-view (FOV) of 30 degrees, and 2 million pixels. This optical system design with the combination of a see-through retinal projector and a compact camera has a volume of about 5.83 cm(3) and a weight of 6.02 g. (C) 2015 Optical Society of America
Simulation of autofocus lens design for a cell phone camera with object distance from infinity to 9.754 mm
(2015-10-01)
Sun, Wen-Shing
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Tien, Chuen-Lin
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Pan, Jui-Wen
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Huang, Kai-Chang
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Chu, Pu-Yi
This paper presents the simulation of an autofocus lens design with large depth of field for a cell phone camera. The object distance of the lens is from infinity to 9.754 mm. When the object distance is from infinity to 550 mm, the value of the modulation transfer function (MTF) is greater than 0.6 for the spatial frequency of 114 lp/mm, the optical distortion is less than 1.5%, and the relative illumination is greater than 67%. When the object distance is from 325 to 9.754 mm, the MTF values is greater than 0.4 for close-up shooting. The optical distortion is less than 1.454%, and the relative illumination is greater than 68.8%. (C) 2015 Optical Society of America