共查询到20条相似文献,搜索用时 31 毫秒
1.
S.G. Li G. Fu I. Reading S.B. Tor N.H. Loh P. Chaturvedi S.F. Yoon K. Youcef-Toumi 《Applied Physics A: Materials Science & Processing》2007,89(3):721-728
Micro powder injection molding (μPIM) is one of the potential processes for the mass production of metallic microstructures
and micro components. Here, μPIM is the miniaturization of conventional PIM, which involves four processing steps: mixing,
injection molding, debinding and sintering. This paper looks into the feasibility and effectiveness of μPIM as a key mass
production process for the fabrication of metallic micro components. For it to be an effective re-production process, it is
imperative to examine how well parts can be duplicated/fabricated from a master mold. In this work, the dimensional variation
of high-aspect-ratio micro-pillars arrays, in particular the dimensional shrinkage, global warpage, and surface roughness
at each stage of the μPIM process for a range of molding pressures, are quantified and compared in detail. The sensitivity
of the dimensional variation of the microstructures to the packing pressure is reported. The mechanism behind the dimensional
variation is analyzed.
PACS 81.20.Ev; 81.20.Hy; 81.70.Fy; 07.60.Ly; 81.05.-t 相似文献
2.
光学塑料元件低压注射成型技术的应用 总被引:1,自引:0,他引:1
光学塑料元件低压注射成型技术是相对于传统注射技术的一大改进。它包括压缩注射成型、低压高速成型、注入气体注射成型和降低模内压力成型。它的主要优点是降低压力、降低能源消耗、降低成本、提高工效、提高光学塑料元件质量。这对于我国光学塑料非球面的开发极有好处 相似文献
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Intra-board interconnection between optical waveguide channels is suitable for assembling high-speed optoelectronic printed
wiring boards (OE-PWB). Here, we propose a novel optical interconnection method combining techniques for both wavelength-based
optical waveguide addressing and plug-in optical waveguide alignment with a micro-hole array (MHA). This array was fabricated
by the mask transfer method. For waveguide addressing, we used a micro passive wavelength selector (MPWS) module, which is
a type of Littrow mount monochromator consisting of an optical diffraction grating, a focusing lens, and the MHA. From the
experimental results, we found that the wavelength addressing operation of the MPWS module was effective for intra-board optical
interconnection. 相似文献
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Yasuhiro Awatsuji Yuu Shiuchi Aya Komatsu Toshihiro Kubota 《Optics and Lasers in Engineering》2006,44(9):975
Design and fabrication of an optimum holographic optical element (HOE) lens for a femtosecond laser pulse using a hologram computer-aided design (CAD) tool is presented. The hologram CAD tool, which the authors have developed can design, analyze, and evaluate holograms fabricated by interferometrical technique. The function of the tool is extended to design and analyze a HOE lens illuminated with a femtosecond laser pulse. An optimum HOE lens for a laser pulse, which has 130 fs duration, 720 nm central wavelength, and 10 nm spectrum bandwidth, is designed by the tool. The optimum HOE lens gives both high diffraction efficiency and small amount of aberration. The designed HOE lens is fabricated and its optical characteristics have been experimentally evaluated. The reconstructed point images agree with the results of the numerical simulations by the tool. The tool demonstrates the capability of designing the optimum HOE lens for a femtosecond laser pulse. 相似文献
9.
Wei Zhang Changlun Hou Yu Geng Guoguang Yang 《Optical and Quantum Electronics》2009,41(14-15):981-988
Closely packed optical fiber arrays are used to increase the scanning speed in some laser scanning systems, but standard optical fibers are shown to be unsuitable for these systems. In this paper, a closely packing technique of micro optical fiber arrays is presented. The fabrication and properties of micro fibers, whose diameters range from several hundred nanometers to several microns, are introduced. These micro fibers are arranged side by side in V-shaped grooves, which are fabricated by photolithography and etching techniques on silicon substrate. Comparing to standard optical fiber arrays, such closely packed micro optical fiber arrays can eliminate the dark area among output light spots and can solve the problem of high accuracy demand of exposure location. This closely packing technique is also proved to be a feasible method in practical scanning systems. 相似文献
10.
为满足便携式投影仪的市场需求,设计了一种基于LED微型阵列的投影系统。该系统由显示单元和投影物镜构成。采用尺寸为12 mm×9 mm的自发光LED微型阵列作为系统的显示单元,利用光学设计软件设计了投影物镜。投影物镜采用反远距光学结构,全视场角为80°,焦距为8 mm,属于强光、广角镜头。在空间频率20 lp/mm处,该物镜的调制传递函数大于0. 85,畸变小于2%,符合投影系统的设计要求。该投影系统具有体积小,结构简单,投影效果好,易加工等诸多优势,可为第三代投影技术的发展提供参考。 相似文献
11.
In micromolding of microlens array, it is important to prepare a mold insert of superb quality, which contains the micro-cavity of lens shape, because the geometrical quality of the mold insert defines the final quality of the molded micro-optics. In the present study, the electroforming process was used to make the metallic micro-mold insert for micro-molding of microlens array. The wettability property of the fabricated mold isnert was examined by measuring the contact angle of the polymer in the pliable state on the mold insert. Microlenses were compression-molded with the fabricated mold insert. The effects of the molding temperature and wettability property on the replication quality of the molded lenses were analyzed experimentally. 相似文献
12.
Mitsuhiro Terakawa Eiji Toratani Tatsuya Shirakawa Minoru Obara 《Applied Physics A: Materials Science & Processing》2010,100(4):1041-1047
We describe a systematic investigation on void structures fabricated by femtosecond laser irradiation inside dielectric materials
for fabrication of a compact optical circuit. Void shapes fabricated in 5 different dielectric materials were compared and
the physical constants determining the void shape were discussed. A long void array is obtainable in a material which has
a low critical power for self-focusing. It was also indicated that the coefficient of thermal expansion is a dominant governing
factor to fabricate a precise void which has a clear boundary. Furthermore, we propose and design a Mach-Zehnder interferometer
in fused silica composed of optical waveguides and photonic crystals to verify practical application of a void array. Simulation
results of the optical propagation in a Mach-Zehnder interferometer indicated that the photonic crystals using a void array
have potential to fabricate compact optical circuits. 相似文献
13.
A GaP microlens for collecting laser light was developed in the tip of a near-field probe. It is important to realize a near-field optical probe head with high throughput and a small spot size. The design and fabrication results of the GaP microlens array are described. The most suitable GaP microlens with a probe was calculated as having a 10 μm radius using the two-dimensional finite difference time domain (2-D FDTD) method. The full width half maximum (FWHM) spot size variation and optical power density tolerance were calculated as 157 nm ± 5 nm and 7%, respectively. A spherical GaP microlens was fabricated with a radius of 10 μm by controlling the Cl2/Ar gas mixture ratio. The difference between the theoretical spherical shape and the fabricated GaP microlens was evaluated as 40 nm at peak to valley. The FWHM spot size and optical throughput of the fabricated microlens were measured as 520 nm and 63%, respectively. The microlens was the same as a theoretical lens with a 10 μm radius. The micron-lens array fabrication process for a near-field optical head was demonstrated in this experiment. 相似文献
14.
自由曲面光学透镜注射成型误差因素研究 总被引:1,自引:1,他引:0
自由曲面光学透镜注射成型误差对其光学性能将产生直接影响。注射成型过程中,注射工艺参数组合的优劣,直接影响成型误差的大小。为了获得高精密度的光学元件,就热塑性塑料的注射温度、模具温度、注射压力、保压压力及保压时间等主要工艺参数,对注射成型误差的影响进行综合研究,并且进行了实验验证。研究结果表明:适当提高注射温度与模具温度,同时采用高压注射、高压保压以及快速保压工艺,可显著降低注塑工件的体积收缩率,显著提高面形精密度,其光学表面面形误差小于0.1μm。可为注射工艺设计提供合理的依据。 相似文献
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A convex-lens-shaped microstructure with a diameter of 50 μm on a metallic mold substrate was fabricated in this paper. A laser ablation process, in which the laser beam was focused and irradiated on the metallic mold substrate in order to remove a part of the substrate, was used for that. The convex-lens-shaped microstructure has not been reported in any studies of microstructure using the laser ablation process. It was proposed that the unbalanced ablation and re-adherence of the melted particles was the processing mechanism of the convex lens shape. The convex-lens-shaped microstructure fabricated in this study is smaller than the focused spot. It was expected that the same convex-lens-shaped microstructure can be fabricated even if the focused spot size is increased, so long as the fluence of the laser can be maintained. Therefore, the method proposed in this paper will improve the low processing speed, which has been the problem of a laser ablation process. The fabricated convex-lens-shaped microstructure on the metallic substrate can be used as the mold for the micro lens. 相似文献
17.
Kuan Chou Hou Po Chien Chou Stone Cheng Yue Jheng Lin Yi Chiu Jin Chern Chiou 《Optical Review》2011,18(1):60-65
In this investigation, a small-form-factor (SFF) pickup head with a holographic optical element (HOE) is fabricated. The system
employs a finite-conjugate object lens to focus a light beam. A holographic optical element is used to simplify the optical
configuration. It provides a better means of alignment of fabrication and reduces the size of system relative to reflective
light route. Micro prisms are fastened with HOE and a silicon substrate, laser diode and photodiode are integrated into the
optical system. The pickup head system based on discrete components and a flip chip bonder with highly accurate alignment
was to integrate it. The micro holographic optical pickup head is fabricated and tested. Experimental results including the
spot diameter and the focusing error signal (FES), demonstrate that the optical system is a feasible. 相似文献
18.
本文对塑料透镜在光学系统中的应用进行了介绍,并对塑料透镜与玻璃透镜进行了比较。着重介绍了非球面塑料透镜在各种光学系统中的应用以及它所显示出的优越性。同时对塑料透镜的原材料、塑料透镜的设计、金属模具的设计和加工、塑料透镜的成型工艺和表面处理进行了介绍。最后还介绍了克服塑料透镜各种缺点应采取的措施。 相似文献
19.
Chien-Yao Huang Jyh-Rou Sze Kuo-Cheng Huang Chao-Hui Kuo Shih-Feng Tseng Chang-Pin Chou 《Optical Review》2011,18(1):96-98
This paper presents a precision glass-molding process to fabricate planar-integrated micro-optical components (PIMOC) applied
to a micro projection display system, optical interconnection system and optical storage system. The PIMOC was designed based
on wave propagation theory, and fabricated using a glass molding process. Experimental results are discussed in this article.
The experiment showed that the PIMOC fabricated in a vacuum environment meets the design value with precision glass-molding
technology (PGMT) at a molding force of 2.75 kN, a molding temperature of 750 °C and a cooling rate of 49 °C/min. 相似文献
20.
Fabrication of two- and three-dimensional periodic submicron structures by holographic lithography with a 635~nm laserand matched photopolymer
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2D and 3D submicron periodic structures are first
fabricated by red-induced photopolymerization using a common 635 nm
semiconductor laser and specially developed red-sensitive polymer
material. The principle of this new photo-polymer material
fabrication is explained and the absorption spectra of the material
are measured. This fabrication technique allows a deeper penetration
into volume and larger interference irradiation area which is more
than 1 cm2. The optical design, theoretical calculations
and experimental results including diffraction patterns
verifying the formation of periodic structures are presented.
Compared with other fabrication technologies using high-power
lasers, this approach has greatly reduced the demand for laser
apparatus. Therefore, it is much more accessible to most
laboratories and potentially usable in holographic fabrication of
photonic crystals and devices in micro electro-mechanical
systems (MEMS). 相似文献