Yasuhiro HATTORI

Publications (12)0 Total impact

• Article: Observations of Structural Transition of Tin Plated Fretting Contacts Using FIB-SEM.

  Tetsuya Ito, Shigeru Ogihara, Yasuhiro Hattori
  IEICE Transactions. 01/2011; 94-C:1350-1355.
• Article: Constriction Resistance Behavior of a Tin or Silver Plated Layer for an Electrical Contact.

  Shigeru Sawada, Kaori Shimizu, Yasuhiro Hattori, Terutaka Tamai
  IEICE Transactions. 01/2010; 93-C:521-526.
• Article: Contact Mechanisms and Contact Resistance Characteristics of Solid Tin and Plated Tin Contacts Used for Connectors.

  Terutaka Tamai, Shigeru Sawada, Yasuhiro Hattori
  IEICE Transactions. 01/2010; 93-C:670-677.
• Article: Observation of Tin Plated Fretting Contacts Using FIB-SEM.

  Tetsuya Ito, Yoshiyuki Nomura, Yasuhiro Hattori
  IEICE Transactions. 01/2010; 93-C:1452-1455.
• Article: Numerical Analyses for Contact Resistance due to Constriction Effect of Current Flowing through Multi-Spot Construction.

  Shigeru Sawada, Terutaka Tamai, Yasuhiro Hattori, Kazuo Iida
  IEICE Transactions. 01/2010; 93-C:905-911.
• Conference Proceeding: Three-Dimensional Structural Study of Tin Plated Fretting Contacts

  Tetsuya Ito, Yoshiyuki Nomura, Yasuhiro Hattori
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  ABSTRACT: First Page of the Article
  Electrical Contacts, 2009 Proceedings of the 55th IEEE Holm Conference on; 10/2009
• Conference Proceeding: Growth Law of the Oxide Film Formed on the Tin Plated Contact Surface and Its Contact Resistance Characteristic

  Yuuya Nabeta, Yasushi Saitoh, Shigeru Sawada, Yasuhiro Hattori, Terutaka Tamai
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  ABSTRACT: First Page of the Article
  Electrical Contacts, 2009 Proceedings of the 55th IEEE Holm Conference on; 10/2009
• Article: Influence of Fretting Wear on Lifetime of Tin Plated Connectors.

  Hirosaka Ikeda, Tetsuya Ito, Shigeru Sawada, Yasuhiro Hattori, Yasushi Saitoh, Terutaka Tamai, Kazuo Iida
  IEICE Transactions. 01/2009; 92-C:1215-1222.
• Article: Contact Area Analysis by FEM with Plating Layer for Electrical Contact.

  Kaori Shimizu, Shigeki Shimada, Shigeru Sawada, Yasuhiro Hattori
  IEICE Transactions. 01/2009; 92-C:1013-1019.
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  Article: Factors Influencing the Fretting Corrosion of Tin Plated Contacts.

  Tetsuya Ito, Masato Matsushima, Kensaku Takata, Yasuhiro Hattori
  IEICE Transactions. 01/2007; 90-C:1412-1416.
• Article: Contact Resistance Characteristics of Improved Conductive Elastomer Contacts for Contaminated Printed Circuit Board in SO2 Environment

  Terutaka TAMAI, Yasushi SAITOH, Yasuhiro HATTORI, Hirosaka IKEDA
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  ABSTRACT: Characteristics of conductive elastomer that is composed of silicone rubber and dispersed carbon black particles show conductive and elastic properties in one simple material. This material has been widely applied to make-break contacts of panel switches and connectors of liquid crystal panels. However, since surface state of the contact is very soft, it is difficult to remove contaminant films of contaminated opposite side contact surface and to obtain low contact resistance owing to break the film. This is an important problem to be solved not only for the application of make-break switching contact but also static connector contacts. This study has been conducted to examine some complex structures of the elastomer which indicate removal characteristics for contaminant films and low contact resistance. As specimens, six different types of elastomer contacts composed of different type of dispersed materials as carbon and metal fibers, metal mesh, and plated surfaces were used. The contacts of opposite side were Au and Sn plated contact surface on a printed circuit board (PCB) which is usually used in the static connector and make-break contacts. In order to contaminate contact surfaces of PCB, the surfaces were subjected to exposure in an SO 2 gas environment. The elastomeric contacts contained hard materials showed lower contact resistance than only dispersed carbon particles in the elastomer matrix for both contaminated PCB contact surfaces.
• Article: Micro-Structural Study of Fretting Contact Caused by the Difference of the Tin Plating Thickness

  Tetsuya ITO, Shigeru SAWADA, Yasuhiro HATTORI, Yasushi SAITOH, Terutaka TAMAI, Kazuo IIDA
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  ABSTRACT: In recent years, there has been increasing demand to miniaturize wiring harness connectors in automobiles due to the increasing volume of electronic equipment and the reduction of the installation space allocated for the electronic equipment in automobiles for the comfort of the passengers. With this demand, contact failure caused by the fretting corrosion is expected to become a serious problem. In this report, we examined micro-structural observations of fretting contacts of two different tin plating thicknesses using Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) and so on. Based on the results, we compared the microstructure difference of fretting contact caused by the difference of the tin plating thickness.