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Electronic Components and technology Conference (ECTC)

作者： K. Hayashi G. Izuta K. Murakami Y. Uegai H. Takao Manufacturing Engineering Center Mitsubishi Electric Corporation Amagasaki Hyogo Japan Corporate Productivity Engineering Department Advanced Technology R&D Center USA Fukuryo Semicon Engineering Corporation

The solder joint between the ceramic substrate and the copper base plate is of critical importance to the reliability of the power module. An improvement of the fatigue life of the solder joint is essential to achieve a reliable module. The development of a new assembly technology for the power module improves the fatigue life of solder joints between the ceramic substrate and the copper base plate. The effect of the solder thickness on the fatigue life has been investigated with the elasto-plastic finite element analyses and experiments. The principal factor was the minimum thickness of solder, not the average thickness. The tilt of the substrate caused the solder thickness to become small partially. So the key technology to improve the fatigue life of the solder joint is to prevent the tilt of the substrate, and to control the solder thickness in high-precision level. The technique of setting spacers on the soldering area of the substrate has been examined, and the wire bump technique has been newly developed. In this technique, some small spacers called the wire bump are stitch-bonded near the comers using the aluminum bonding wire.

关键词： Fatigue Soldering Thickness control Wire Multichip modules Ceramics Copper Assembly Finite element methods Space technology

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100-hour continuous operation of a 20-W frequency-converted 266-nm UV laser

100-hour continuous operation of a 20-W frequency-converted ...

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Conference on Lasers and Electro-Optics (CLEO)

作者： T. Kojima S. Konno S. Fujikawa K. Yasui T. Kamimura M. Yoshimura Y. Mori T. Sasaki M. Tanaka Y. Okada Advanced Technology R&D Center Mitsubishi Electric Corporation Limited Amagasaki Hyogo Japan Department of Electrical Engineering Osaka University Suita Osaka Japan KogakuGiken Company Limited Atsugi Kanagawa Japan

Summary from only given. We report on 100-hour high-power UV beam generation with high quality CsLiB/sub 6/O/sub 10/ (CLBO) crystal. We show the schematic drawing of the UV laser system which uses a high-quality CLBO ... 详细信息

关键词： Frequency Power generation Optical pumping Laser modes Pump lasers Power lasers Fiber lasers Laser beams Optical sensors Oscillators

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direct evidence for singlet-triplet exciton annihilation in π-conjugated polymers

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Physical review B 2002年第23期66卷 235203-235203页

作者： E. J. W. List U. Scherf K. Müllen W. Graupner C.-H. Kim J. Shinar Christian Doppler Laboratory Advanced Functional Materials Institute of Solid State Physics Graz University of Technology A-8010 Graz Austria & Institute of Nanostructured Materials and Photonics A-8160 Weiz Austria Ames Laboratory-USDOE Iowa State University Ames Iowa 50011 Institut für Physikalische und Theoretische Chemie Universität Potsdam D-14476 Golm Germany Max-Planck-Institut für Polymerforschung Mainz Germany Department of Physics Virginia Tech Blacksburg Virginia 24060 Department of Physics and Astronomy Iowa State University Ames Iowa 50011

A blend of two conjugated polymers with different optical band gaps and different triplet exciton (TE) magnetic resonance features was studied by means of photoinduced absorption (PA) and photoluminescence detected magnetic resonance. From the latter we find that a reduction of TE’s on either of the two polymers enhances the radiative singlet exciton (SE) decay on both polymers nearly identically. The PA results rule out other possible mechanisms to yield this signal, except one: a long-range SE-TE annihilation due to a dipole-dipole transfer mechanism. Based on this finding, we calculate the transfer radius and quantify the annihilation process for this system and for other conjugated polymers.

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Effects of the polymer residues on via contact resistance after reactive ion etching

Journal of Vacuum Science & Technology B: Microelectronics a...

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Journal of Vacuum Science & technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena 2002年第3期20卷 1000-1007页

作者： Hyoung-Soo Ko Jae-Woong Nah Kyung W. Paik Y. Park Fab. Tech 1 Team Memory R&D Division Hynix Semiconductor Inc. San 136-1 Ami-ri Bubal-eub Ichon-si Kyungki-do 467-701 Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology 373-1 Kusong-dong Yusong-gu Taejon 305-701 Korea Nano-Surface Group Korea Research Institute of Standards and Science P.O. Box 102 Yusong Taejon 305-600 Korea

The effects of CF4 addition to O2 reactive ion etching (rIE) of a polyetherimide ( Ultem®) surface and resultant via contact resistance were investigated using scanning electron microscopy (SEM), x-ray electron spectroscopy (XPS), and cross bridge Kelvin resistor (CBKr). In pure O2 rIE, the SEM micrograph showed that the originally smooth Ultem surface became rough and the rough features coarsened with increasing rIE time, resulting in residual particles on the metal pads. However, in the case of O2+CF4 rIE, the Ultem surface remained smooth throughout the etching process, and residue free metal pads were obtained. The XPS experiments identified that the origin of the Ultem surface roughening was organo-Si compound, which is easily converted to silicon oxide during O2 rIE. In contrast, the atomic fluorine in O2+CF4 rIE process etched out the silicon and the silicon oxide, resulting in smooth film surface and residue free metal pads. The metal to metal via contact resistance was measured by CBKr, and the pattern fabricated by O2+CF4 rIE showed lower contact resistance than those by O2 rIE. These results are discussed in the criterion of contact area and contact conformality differences.

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Non-invasive respiratory-gated radiation treatment system based on a 3-d ultrasound device and a 3-d digital localizer

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International Journal of radiation Oncology*Biology*Physics 2002年第2期54卷 314-314页

作者： M Kokubo A Sawada K Yoda Y Nagata M Hiraoka Department of Image-Based Medicine Institute of Biomedical Research and Innovation Kobe Japan Advanced Technology R&D Center Mitsubishi Electric Corporation Amagasaki Japan Department of Therapeutic Radiology and Oncology Graduate School of Medicine Kyoto University Kyoto Japan

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Hybrid FdTd-SPICE analysis of radiated emission from PCB with integrated circuits

Hybrid FDTD-SPICE analysis of radiated emission from PCB wit...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： A. Nishizawa G. Kobidze S. Tanabe Advanced Technology R&D Center Electromechanical System Department Mitsubishi Electric Corporation Limited Amagasaki Hyogo Japan

The radiated emission from ground bouncing and transmission lines have been analyzed using the finite difference time domain (FdTd) and SPICE hybrid method. This method can consider both the nonlinear electric characteristics of IC and the distributed parameters of printed circuit boards (PCB). The computed results of the electric field at 3 m from the PCB were validated by the measurements. The hybrid tool allows calculation of the noise spectrum and radiation pattern. Another advantage is that this method can separate the contributions of various noise sources. This analysis tool and methodology is useful to design transmission lines and power/ground planes in PCB.

关键词： Power transmission lines Finite difference methods Time domain analysis distributed parameter circuits SPICE Electric variables Printed circuits Transmission line measurements Electric variables measurement Integrated circuit noise

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Optical solder effects of self-written waveguides in optical circuit devices coupling

Optical solder effects of self-written waveguides in optical...

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Electronic Components and technology Conference (ECTC)

作者： N. Hirose T. Yoshimura O. Ibaragi Electronic System Integration Technology Department NTT Musashino R&D Centre Association of Super-Advanced Electronics Technology Musashino Tokyo Japan

ISBN: (纸本)0780370384

Easy, convenient and accurate optical component coupling methods have been proposed using self-written waveguides. The effect of this unique method is systematically studied here for two faced multi-mode optical fibers with various gaps. The optical fiber coupling is easily attained and the coupling loss significantly decreases after self-written waveguide formation even with a extended gap, more than 1000 /spl mu/m; the results clearly show that such self-written waveguide coupling is very effective; the waveguides act as "optical solder" in a gap between two optical components. All-solid type self-written waveguide formation and multichannel waveguide formation/connection are also successfully demonstrated; these results expand the application of self-written waveguides in future practical use. Unique, icicle shaped self-written waveguide formation is also described.

关键词： Optical devices Optical waveguides Coupling circuits Optical coupling Optical fibers Holographic optical components Holography Optical refraction Optical sensors Optical variables control

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Optical component coupling using self-written waveguides

Optical component coupling using self-written waveguides

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European Conference on Optical Communication (ECOC)

作者： N. Hirose T. Yoshimura O. Ibaragi Electronic System Integration Technology Department NTT Musashino R&D Centre Association of Super-Advanced Electronics Technology Musashino Tokyo Japan

ISBN: (纸本)0780367057

The self-written waveguide is a possible solution to improving the alignment of optical connections. By introducing light from an optical fibre edge to a photosensitive medium, an optical waveguide easily forms under the condition that the refractive index of the exposed medium increases; it gives a hybrid optical component composed of an optical fibre and an optical waveguide without any alignment adjustment. The method is described and experimental results given for multi-mode fibre (MMF) coupling. Self-written waveguides were successfully formed in the gap between two MMFs; the coupling loss was about 0.6 dB for a 500 /spl mu/m gap.

关键词： Optical devices Optical coupling Optical waveguides Optical waveguide components Optical refraction Optical variables control Optical fibers refractive index Waveguide discontinuities Optical losses

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A modelling approach to suspension friction

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Autotechnology 2001年第3期1卷 54-56页

作者： Nakahara, Jun Minakawa, Masaaki Gipser, Michael Wimmer, Juergen Automotive Advanced Technology Research Honda R&D Europe Germany Automotive Engineering Department Esslingen University of Applied Sciences Germany Cosin Software Germany

An automotive suspension system consists of various elements that cause friction, and this sometimes plays a critical role in determining the overall vehicle response and behaviour, especially with regard to very small amounts of suspension travel represented by vertical „boulevard jerk“(2~6Hz) and „rumble“(8~20Hz). The authors have attempted to improve the accuracy of the simulation for a vehicle’s ride comfort.

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A large and ultra fast nonlinear response of GaAs thin films due to nano-scale spatial structure of the internal field

A large and ultra fast nonlinear response of GaAs thin films...

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Quantum Electronics and Laser Science Conference (QELS)

作者： H. Ishihara K. Cho K. Akiyama N. Tomita Department of Physical Science Machikaneyama Toyonaka Osaka Japan Mitsubishi Electric Corporation Advanced Technology R&D Center Amagasaki Hyogo Japan

Summary form only given. How we can overcome the trade-off between the magnitude of nonlinearity and response time of semiconductors is a challenging problem because a resonant excitation for large nonlinearity usually induces a long decay time. recently, a large enhancement of the degenerate-four-wave mixing (dFWM) for GaAs thin films has been observed for a particular thickness (110 nm). As theoretically predicted, this is due to the resonant enhancement of the internal field with a nano-scale spatial pattern. In this paper, we elucidate that this enhanced response also shows very fast decay, by means of time-resolved measurements of the three beam dFWM and nonlocal transient response theory.

关键词： Gallium arsenide Transistors Nanostructures Quantum well devices Excitons resonance Electromagnetic coupling Optical coupling Molecular beam epitaxial growth Statistics

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