Journal of the Horological Institute of Japan
Online ISSN : 2432-1915
Print ISSN : 0029-0416
ISSN-L : 0029-0416
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Volume 99
Displaying 1-9 of 9 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1981 Volume 99 Pages Cover1-
    Published: December 20, 1981
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.99.0_Cover1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Cover
    1981 Volume 99 Pages Cover2-
    Published: December 20, 1981
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.99.0_Cover2
    JOURNAL FREE ACCESS
    Download PDF (175K)
  • A measurement of thickness of LCD cell
    Toshihiro TAKAO
    Article type: Article
    1981 Volume 99 Pages 4-12
    Published: December 20, 1981
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.99.0_4
    JOURNAL FREE ACCESS
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    A new method has been devised for directly measuring LCD cell thickness, using a specially calibrated scale. Micro-computers have been used recently to simplify the operation and to increase the precision of measurements of LCD cell thickness. However, the author has developed a (convenient) method whereby the usc of a micro-computer becomes unnecessary.
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  • DEVELOPMENT OF ULTRA-THIN AgO BATTERIESFOR WATCH USE
    TSUGIO SAKAI
    Article type: Article
    1981 Volume 99 Pages 13-22
    Published: December 20, 1981
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.99.0_13
    JOURNAL FREE ACCESS
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    In recent years, the quartz watch has been gaining popularity and increasing its market share, because of the remarkable improvement in the styling and performance, that is, the realization of thinner stylig, higher precision, higher reliability and longer life. Especially, the improvement in the styling is worthy of attention;many watch movements of less than 2mm in thickness are realized and thin watches using the thin movements are favorably received by the publ ic. To the improvement in styling, the contribution has been made by the reduction in thickness of watch components such as quartz oscillator, IC, LC panel, battery, etc. Among these components, the reduction in thickness of the battery which occupies the largest space in the watch is most important. As such, we have developed highly reliable ultra-thin AgO batteries which are approximately lmm in thickness. In this paper, we will describe various measures taken in the design stage and some improvements made in the production stage to realize the ultra-thjn batteries.
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  • DEVELOPMENT OF ULTRA-MINIATURE 32kHz QUARTZ RESONATOR UNIT
    Hideo Tabata
    Article type: Article
    1981 Volume 99 Pages 23-29
    Published: December 20, 1981
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.99.0_23
    JOURNAL FREE ACCESS
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    The ultra-miniature tube type quartz resonator unit was developed. This resonator unit of only lmm in diameter is exceedingly small in size in comparison with the conventional resonator unit, excellent in mass-productivity and facilitates to design the thin and miniature wristwatches. This ultra-miniature resonator unit is realized by the development of the resonator chip produced by the sophisticated lithographic technique, the optimum design of the miniature unit parts and the sophisticated assembling and adjusting techniques. Several problems attended with the miniaturization of the resonator unit, such as deterioration of the performance by the out-gas from the unit interior, were solved and the reliability equivalent to the conventional unit was successfully ensured.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    Article type: Article
    1981 Volume 99 Pages 30-40
    Published: December 20, 1981
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.99.0_30
    JOURNAL FREE ACCESS
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    The musical alarm clocks and watches appeared about three years ago. Recently, more than lO,OOO,OOO pcs digital watches with musical alarm function are produced annually all over the world. The reason of this prosperity is that musical alarm fits more for young people's sensitivity than beep sound alarm. For there market requirements, we have developed musical chips which play comfortable melodies automatically and can be driven by low voltage source. In the process of developing them, we examined from many viewpoints such as low power supply, low current consumption, dignity of sound and frequency limits. Then we have obtained an efficient linear amplifier and excellent melody generation system.
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1981 Volume 99 Pages 41-47
    Published: December 20, 1981
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.99.0_41
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1981 Volume 99 Pages 48-50
    Published: December 20, 1981
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.99.0_48
    JOURNAL FREE ACCESS
    Download PDF (285K)
  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1981 Volume 99 Pages 51-53
    Published: December 20, 1981
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.99.0_51
    JOURNAL FREE ACCESS
    Download PDF (490K)
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