Journal of the Japan Society for Precision Engineering
Online ISSN : 1882-675X
Print ISSN : 0912-0289
ISSN-L : 0912-0289
Volume 68, Issue 8
Displaying 1-22 of 22 articles from this issue
  • Mikio HORIE
    2002 Volume 68 Issue 8 Pages 997-1000
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
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  • New Manufacturing Process Using Chemical Ability of Water
    Yuzo MORI, Kikuji HIROSE, Kiyoshi YASUTAKE, Hidekazu GOTO
    2002 Volume 68 Issue 8 Pages 1001-1003
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
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  • Minoru IWAI, Yosiki MASUZAWA, Akira SHOJI
    2002 Volume 68 Issue 8 Pages 1004-1005
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
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  • Susumu FUJII, Masahiko ONOSATO, Hironori HIBINO
    2002 Volume 68 Issue 8 Pages 1006-1007
    Published: August 05, 2002
    Released on J-STAGE: December 04, 2009
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  • Rolling Machine Elements for Environment-friendly Machine Tools
    Kenji FUJII, Shigeo SHIMIZU
    2002 Volume 68 Issue 8 Pages 1008-1009
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
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  • A Key Issue for MEMS Commercialization
    Toshihiro ITOH
    2002 Volume 68 Issue 8 Pages 1010-1012
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
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  • Yasuhiko ARAI, Yukitoshi OTANI, Toru YOSHIZAWA
    2002 Volume 68 Issue 8 Pages 1013-1015
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
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  • Toshiyuki MIYAZAKI, Takeji ARAI
    2002 Volume 68 Issue 8 Pages 1016-1017
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
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  • Consider reasonable size of the production machines
    Tokio KITAHARA, Kimiyuki MITSUI, Yuichi OKAZAKI
    2002 Volume 68 Issue 8 Pages 1018-1020
    Published: August 05, 2002
    Released on J-STAGE: December 04, 2009
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  • 2002 Volume 68 Issue 8 Pages 1021-1023
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
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  • Method for Change of Control Characteristics and the Result of Actual Line
    Takayoshi OBATAKE, Hiromitsu KUMAMOTO
    2002 Volume 68 Issue 8 Pages 1025-1029
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    Extrusion is a typical production method of siding used as a board for surfacing the outside wall of a building. In order to manufacture it with high quality, it was found that preview control for each conveyer was effective, and the method was successful in order for the conveyers to follow up the target, the pattern roller speed, even if the conveyer characteristics had quite a few delays, shown in the previous paper. However, as the production line operation continues, the control characteristics such as delay and gain of each conveyer gradually change, the preview control does not follow up the target successfully. In this paper, a self-tuning method for the characteristic change is proposed and then it is shown in the actual line that the preview control achieves the tracking control over a long time in spite of the changes of the conveyer characteristics.
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  • Analysis Method in the case that Modal Functions are not Orthogonal
    Seiji AOYAGI, Hiroho KITADA, Yutaka KUSUDA, Yoshimasa MATSUMOTO, Masah ...
    2002 Volume 68 Issue 8 Pages 1030-1036
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    A new method of analyzing the tapping motion of a cantilever, on the tip of which impulsive force and moment are given, is proposed based on elastic vibration theory. In this method the contact object is assumed to be a spring of which stiffness is hard enough. The force which is given by the spring is regarded as the impulsive force. The product of this force by the gap length between the surface of cantilever and that of the contact object is regarded as the impulsive moment. Contact damping and air damping are also considered. It is newly proved that the modal functions, which satisfy the boundary condition, are not orthogonal in the state that the tip is contact with the object. Taking account of that, the method which solves the initial value problem by using a matrix operation is proposed. By joining the solution in the free state and that in the contact state so as to satisfy the initial conditions at every beginning and ending time of the contact successively, the behavior of the tapping vibration of the cantilever can be analyzed. A micro cantilever, which is assumed to be used for a probe memory head, is adopted as a numerical example, and the motion of it is analyzed by the proposed method. FEM analysis and experiments using a macro scale model are also carried out, and the validity and the merit of saving the calculating time of the proposed method are proved.
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  • Keigo TAKEUCHI, Shun'ichi KANEKO, Satoru IGARASHI, Yutaka SATO, Tadash ...
    2002 Volume 68 Issue 8 Pages 1037-1041
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    A new method for analysis of human behavier in public spaces like an atrium is proposed. There have been some difficulties in analysis of human staying, because that it is difficult to discriminate human staying from stationary background scene. In this paper, general human behavier in staying can be analyzed and modeled by short term brightness fluctuations caused by arm or leg motions or pitching around the stationary bodies. In the background subtraction scheme, background alternation can be detected robustly by using a LMedS estimation scheme and utilized for detection of the short term brightness fluctuations. An image processing technique is developped for detecting them from observation images and estimating stationary.bodies by extending the fluctuations into neighboring regions. Detected regions can be filtered by a robust texture descrimination shceme as human motions or other ones such like illumination change or shading. After this, human staying regions can be accumulated to obtain stable estimation of the staying characteristics. Some fundamental experiments utilizing real data from an atrium are performed and the effectiveness of the proposed method is verified.
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  • Hiroshi SHIMONO, Shun'ichi KANEKO, Satoru IGARASHI
    2002 Volume 68 Issue 8 Pages 1042-1046
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
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    Advanced algorithms are proposed for fast image matching based on two-dimensional orthogonal expansion by marginal eigenvectors for a set of training pictures. The original method has been proved to be efficient by use of the vectors of smaller dimensions rather than the number of pixels. It is based on two eigenvalue problems for the average column and row covariance matrices made of the training pictures, and then the computation time for training was reduced in comparison with the methods based on the non-marginal eigenvectors. However, the computation time for recognition or registration remained to be improved. In this paper, the computation cost for registration can be reduced by use of two algorithms of fast computation: fast computation of expansion coefficients and efficient computation of distances in the coefficient space. A rotation-invariant registration method based on the proposed algorithms is designed. The effectiveness of the proposed algorithms can be shown through fundamental experiments with real images.
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  • Hitoshi TAMURA, Oichi ATODA, Tsunenori HONDA
    2002 Volume 68 Issue 8 Pages 1047-1051
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    In this study, an approach for clustering various texture images has been derived using both Fourier power spectrum patterns and a shape-pass filter bank, and the experiments have been carried out. Clustering of texture images have been tried so far, but it was necessary to restrict texture images to some class to get good results. Furthermore, both structural and statistical viewpoints are essential to the fundamental approaches for texture images, but a new viewpoint is needed to fold the human sensitivity to texture images. In this approache, the results coinciding with human sensitivity to some degree have been got by clustering using Fourier power spectrum patterns of circle, doughnut, ellipse, twin, cross, line and other periodical patterns, then the shape feature vector of nine shape elements, black/white line, black/white pepper, black/white roof, black/white snake, and cliff.
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  • Teruhisa AKASHI, Hideaki TAKEMORI, Tetsuya TOMOBE, Toshiaki KOIZUMI
    2002 Volume 68 Issue 8 Pages 1052-1056
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    An AIN submount with a thin film resistor and high heat conductivity has been developed for precisely mounting a laser diode (LD) in an optical-disk storage system or a LD module for optical communication. The thin film resistor consisted of a tantalum-nitride (Ta 2N) thin film deposited by RF magnetron reactive sputtering at a deposition rate of 50 nm/min, a substrate temperature of 350°C, and a nitrogen pressure ratio of 6.0%. We measured the electrical properties of the Ta 2N thin film resistor on the AIN submount. The resistance was approximately 57.8 Ω and the temperature coefficient of resistance was -30.9 ppm/°C. Moreover, we found that the rate of change of resistance was less than 1.76% on average after reliability tests under conditions such as damp heat (85°C, 85%, 1000 hours), high temperature (150°C, 1000 hours), high temperature in operation (85°C, 40 mA, 1000 hours), and temperature cycling (-30-90°C, 1000 cycles). We thus concluded that the Ta 2N thin film resistor has high reliability, and such reliable characteristics make the AIN submount suitable for optical devices.
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  • Effect of the Temperature Differences in the Cooling Water
    Hiroyuki KAGAWA, Takeshi YONEYAMA, Tsuyoshi ITO, Toyotsugu ITO, Akihir ...
    2002 Volume 68 Issue 8 Pages 1057-1061
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    An injection mold with inside cooling water channels which are difficult to be made by conventional machining method has been fabricated by using selective laser sintering of metal powders. By the cooling inside the corner of the core, the temperature difference in the mold is reduced and then the dimension accuracy of the work piece is improved compared with the work piece injected in the mold with outside cooling channels. When the water temperature of the inside channel in the core is assigned lower than that of outside channel in the cavity, the temperature distribution in the mold becomes more uniform and the dimension accuracy of the work piece has been further improved. After the experiment, the structure of the sintered mold and its thermal conductivity has been measured to consider on the relation with temperature distribution in the mold. In order to achieve the uniform temperature distribution in the mold, adequate channels location will be necessary in relation with the thermal conductivity of the mold.
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  • Toshio MORO, Akihiro GOTO, Naotake MOHRI, Nagao SAITO, Koei MATSUKAWA, ...
    2002 Volume 68 Issue 8 Pages 1062-1066
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    This study deals with the application technology of Electrical Discharge Coating(EDC) to improve cutting tool(drill) life by Electrical Discharge Machining. Nowadays, multi-coated tools by PVD or CVD are developed to carry out high efficiency metal cutting. But, life of re-grinding coated tools decrease by approximately under one-half of original one. Beside, re-coating technology is difficult to employ a fine and complex cleaning procedures for removing some waste from tools surface. Therfore, the recycle usage of worn tools are not avairable as common technology. In this report, some experiment are done to be cleared above mentioned problem whether EDC drills are available or not in compare with TiN coated drills. The main result of experiments are as follows; (1) The layer made with EDC has less voids defect, and has exactly fine crystal structure on the surface of tool. (2) The hard layer by EDC can be applied to major flank surface after re-grinding of worn drills. (3) Life of EDC drills become to same life of new TiN coated drill or to be over than original life. (4) EDC drills show a high resistance against chipping of tool edge in compare with TiN coated drill during hole machining.
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  • Masaru SAEKI, Tsunemoto KURIYAGAWA, Katsuo SYOJI
    2002 Volume 68 Issue 8 Pages 1067-1071
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    This paper deals with a parallel grinding method for ultra-precise aspherical parts such as aspherical lenses, molding dies and mirrors. The needs of the improvement in image quality for the latest digital image equipments are steadily increasing, and a high accuracy of aspherical lenses has been strongly required. Therefore, the development of the more precise grinding technology for the aspherical glass lenses and glass molding dies is required. The parallel grinding method is an arc-envelope grinding method in which a grinding wheel with an arc-shaped cross-section is used to generate an aspherical profile. The property of the ground surface by the parallel grinding method and the conventional method (cross grinding method) was compared about tungsten carbide (WC) for glass lens molding dies. It is clear that a better surface quality is obtained by the parallel grinding method.
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  • Hirofumi HIDAI, Hitoshi TOKURA
    2002 Volume 68 Issue 8 Pages 1072-1076
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    Chemical vapor deposition (CVD) is one of the most popular film deposition methods on solid substrates. We propose a new powder synthesis method utilizing CVD process, that uses a liquid instead of a solid as a substrate. The gas close to the liquid surface and/or dissolved in the liquid was decomposed by laser irradiation and particles were synthesized. Water was used as a liquid, because of its large solubility. Diamond like carbon particles were synthesized by ArF excimer laser irradiation to the methane dissolved in water. Grain size of the particle synthesized from the gas close to the liquid surface was 50-200nm, and that from the gas dissolved in the water was 200-700nm. Grain size could be varied with laser power. Energy dispense spectroscopy (EDS) clarified that the powder mostly consisted of carbon, and oxygen and nitrogen could not detected. High resolution transmission electron microscope (HR-TEM) and electron diffraction revealed that the powder was composed of diamond like carbon (DLC) and multiwall carbon nanotube was grown on the DLC
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  • Yuzo MORI, Hiroaki KAKIUCHI, Kumayasu YOSHII, Kiyoshi YASUTAKE, Mitsuh ...
    2002 Volume 68 Issue 8 Pages 1077-1081
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    Further investigations to improve the quality of the amorphous silicon (a-Si) films fabricated at extremely high deposition rate by atmospheric pressure plasma CVD were performed. The electrical and optical properties of the films were investigated with the measurements of photo and dark conductivity and optical absorption, and the relationship between each deposition parameter and the film properties was studied. It became clear that the optimum input power and the deposition gap existed for both of increasing the deposition rate and improving the film properties. Furthermore, the optical gap (E opt) could be controlled by the hydrogen concentration in the plasma and the substrate temperature. As a result of optimizing the deposition parameters, it became possible to improve the film quality under the ultrahigh-rate deposition condition. The maximum deposition rate of the device-quality a-Si film was 0.28μm/s. At this deposition condition, it might be possible by scanning substrate to form a-Si film of the thickness of 0.3μm on the substrate of 1m×1m area in 200 seconds, which was more than 10 times faster than the conventional plasma CVD process. E opt of the device-quality film was in the range of 1.58≤E opt≤1/68V, , which was similar to that of a-Si film fabricated by the conventional plasma CVD at low deposition rate.
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  • Proposal of Phase Coincidence Rounding Effect Criterion Diagram in Generalized Centerless Grinding
    Takashi MORIYA, Akira KANAI, Masakazu MIYASHITA
    2002 Volume 68 Issue 8 Pages 1082-1087
    Published: August 05, 2002
    Released on J-STAGE: April 10, 2009
    JOURNAL FREE ACCESS
    A centerless grinding is characterized by supporting a workpiece with the periphery to be ground under a preliminary selected geometrical arrangement and in viewpoint of rounding action there exist geometrical/statical stability and also a dynamic stability in the grinding system. Therefore, for realizing generalized work set-up conditions for stability it is necessary to derive an analytical method to be able to review both of the geometrical/statical stability and also the dynamic stability simultaneously. In the present paper, by introducing a vector phase coincidence method instead of the conventional vector locus coincidence method a phase coincidence rounding effect criterion diagram has been newly proposed for the above requirement. Application of the diagram enables to give a guideline to the generalized work set-up conditions considering an effect of selection of a top angle of work support blade, which was neglected in the conventional approximated analysis. A several experimental results prove applicability of the guideline.
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