Micromechatronics
Online ISSN : 2432-0358
Print ISSN : 1343-8565
Volume 61 , Issue 216
Showing 1-12 articles out of 12 articles from the selected issue
  • Tetsuya MIYAKE, Tsuyoshi KOGOSHI
    2017 Volume 61 Issue 216 Pages 2-10
    Published: June 15, 2017
    Released: October 11, 2018
    JOURNALS FREE ACCESS

      We report why we decided to study new concept of wearable product and chose to use active matrix EPD for it. After we examine consumer acceptability for the concept, we found out key word “story”. We named the new wearable product “Smart Canvas” which band and head can be seen as one canvas and show a “story” on the EPD screen. We developed new software platform which has multiple display layer based on different unit of time to show rich story.

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  • Yuichi MORI
    2017 Volume 61 Issue 216 Pages 11-16
    Published: June 15, 2017
    Released: October 11, 2018
    JOURNALS FREE ACCESS

      We developed a thin tourbillon watch for the first time as a major watchmaker in Japan with the aim of showing the people around the world the intricate charm of watches. We devised the new shape of the pallet for the escapement and realized substantial thinning and downsizing of the carriage. By using this carriage, we have developed the world's most compact (smallest) Tourbillon watch by now. And, by using titanium alloy instead of brass, we reduced the weight of the carriage and lengthened the driving time of the watch. We confirmed that the effect of the tourbillon can reduce the rate deviation in vertical positions to 10 to 17% of the conventional type mechanical watch.

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  • Takashi HOSAKA, Kazuya IMAMURA
    2017 Volume 61 Issue 216 Pages 17-23
    Published: June 15, 2017
    Released: October 11, 2018
    JOURNALS FREE ACCESS

      "Eco-Drive" is Citizen Watch Company's most significant technology and is thought to be the mainstream technology for developing the next generation watches. It is the total technological system integrating solar power generation, downsizing (reduction of size, weight, thickness), high-grade design, radio controlled watch, short-range wireless communication, and etc. Applying this technology, various watches have been developed. In this article, we will explain the detailed structure of extra thin-sized movements for Eco-Drive products.

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  • Tatsuyoshi OMURA, Susumu YAMAZAKI, Takeshi MIYAKE
    2017 Volume 61 Issue 216 Pages 24-30
    Published: June 15, 2017
    Released: October 11, 2018
    JOURNALS FREE ACCESS

      CASIO Corporation has developed the divers watch "FROGMAN" as a brand of the Shock Proof Watch "G-SHOCK" specialized in durability under severe underwater. We aimed to be a more practical product in diving activities, developed new triple sensor and new diving user interface, and commercialized the GWF-D1000 as a new FROGMAN which has triple sensor, radio controlled, and tough solar powered digital watch. This paper explains the technical summary of the development of GWF-D1000.

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  • Saki MIURA, Motoaki KOBAYASHI, Takayuki OGAWA, Masahiro SATHO, Emi KUR ...
    2017 Volume 61 Issue 216 Pages 31-37
    Published: June 15, 2017
    Released: October 11, 2018
    JOURNALS FREE ACCESS

      Co - Cr - Mo alloy has excellent corrosion resistance and abrasion resistance, and it is widely used as a biomaterial such as an artificial hip joint. This alloy’s hardness, scratch resistance, and light weight will be merits when used for watch exteriors. However, the alloy has poor plasticity and difficulty in hot forging. These shortcomings must be overcome to satisfy the high aesthetic demand for watch exteriors. This paper reports optimum forging conditions and process design guidelines obtained by forging simulation. The simulation enabled us to evaluate the forging processes and allowed us to fabricate the fine features of watch exteriors.

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