Journal of the Horological Institute of Japan
Online ISSN : 2432-1915
Print ISSN : 0029-0416
ISSN-L : 0029-0416
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Volume 155
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1995 Volume 155 Pages Cover1-
    Published: December 25, 1995
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.155.0_Cover1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Cover
    1995 Volume 155 Pages Cover2-
    Published: December 25, 1995
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.155.0_Cover2
    JOURNAL FREE ACCESS
    Download PDF (26K)
  • Voltage Controlled S-TCXO's Employing NS-GT Cut Quartz Crystal Resonators
    Hirofumi KAWASHIMA, Kenji SUNAGA
    Article type: Article
    1995 Volume 155 Pages 1-22
    Published: December 25, 1995
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.155.0_1
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • Message Watch Receiver using FM Subcarrier
    Shunsuke KOYAMA, Shogo KUROSAWA
    Article type: Article
    1995 Volume 155 Pages 23-37
    Published: December 25, 1995
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.155.0_23
    JOURNAL FREE ACCESS
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    Watch type redio apparatus is a symbolic one and a dream merchandise as well in the future world. As the first step of ideal two way radio apparatus, we have developed a message watch receiver by use of FM subcarrier system. The Message Watch Receiver has the following features; 1) Using custom IC's for minimizing watch size:These are each for FM receiver, data decoder and CPU. FM receiver is of single-heterodyne type which receives the U.S. and European FM band (87.4 to 108MHz). A image cancelling Mixer is included. 2) Duo-binary technique for acheving higher bit rate (19kbit/sec):Data synchronized 19kHz clock signal can be transformed. This technique makes data decoding much more simpler than binary system. 3) Special tuning technique for watch band anntena:Since loop antenna is in the watchband, special tuning technique is used to adjust the band length and tune correct frequency. Antenna is tuned to make receiving signal level maximum. 4) Long battery life over 1.5 year:40ms receiving period and nearly 120s receiving cycle achieve very small average current consumption. This keeps battery life of the watch 1.5 years. Basic technique for achieving these features are described here. we can use this message watch in the U.S. snd Europe at present.
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  • Manufacturing Design of Watch Case made of Titanium Alloy
    Minami KIMURA
    Article type: Article
    1995 Volume 155 Pages 38-50
    Published: December 25, 1995
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.155.0_38
    JOURNAL FREE ACCESS
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    Manufacturing design should be performed by means of material selection and deformation property control using structure adjustment. Along this manufacturing design, the following three technologies have been developed. 1) Precipitation period has been reduced from 24 hours down to 5 hours by means of the two stage precipitation method, first at 573K and next at 773K. By use of Ti-15% V-3% Cr-3% Sn-3% Al(15-3), a good wearing resistance for 1.5 years has been accomplished for the watch case. 2) Portable superplastic forging system using impulse control has been developed. Diver type watch case has been manufactured by the superplastic forging under constant load at 1073K, by use of Ti-4.5% Al-3% V-2% Fe-2% Mo(SP700). 3) The mirror polished surface similar-looking to hard alloy has been obtained by use of fine grain2 to 3μm in size range.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    Article type: Article
    1995 Volume 155 Pages 51-83
    Published: December 25, 1995
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.155.0_51
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1995 Volume 155 Pages 84-97
    Published: December 25, 1995
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.155.0_84
    JOURNAL FREE ACCESS
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