Journal of the Horological Institute of Japan
Online ISSN : 2432-1915
Print ISSN : 0029-0416
ISSN-L : 0029-0416
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Volume 138
Displaying 1-8 of 8 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    1991 Volume 138 Pages Cover1-
    Published: September 20, 1991
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.138.0_Cover1
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Article type: Cover
    1991 Volume 138 Pages Cover2-
    Published: September 20, 1991
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.138.0_Cover2
    JOURNAL FREE ACCESS
    Download PDF (34K)
  • Development of a Compact Electronic Word Translator
    Mitsuru KUBOTA, Kouichi MIYASAKA, Mikio AOKI
    Article type: Article
    1991 Volume 138 Pages 1-14
    Published: September 20, 1991
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.138.0_1
    JOURNAL FREE ACCESS
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    A compact Electronic English Word Translator has been developed. Firstly a character image is put in by using a manual scanner, and word space is presumed and word region is extracted. Then this extracted English word is translated into Japanese by using English-Japanese dictionary in ROM memory (4Mx2), and the result is displayed on a LCD panel. We have realized an auto-extracting-word method and an auto-cutting-character method by setting up two parameters (normal word space and normal character width), which are obtained by counting peripheral distribution over word line region. This translator is of 130 grams weight and has 90% word recognition rate.
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  • Measurement of Water Depth using Diver's Watch with Depth Gauge
    Minoru YAMADA
    Article type: Article
    1991 Volume 138 Pages 15-21
    Published: September 20, 1991
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.138.0_15
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    An experiment to compare the accuracy of water depth measurement was conducted by use of three types of diver's watch with the function of measuring water depth developed by Japanese watch manufacturers, diving computers, and conventional mechanical depth gauge. The accutacy was compared with the digital depth gauge of a deep diving system, which is highly reliable. As the results, all three types of diver's watch were accurate giving the indications close to that of the digital depth gauge. The diving computers were accurate next to the diver's watches, but it was proved that the error is large in the mechanical depth gauge.
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  • Some Characteristics of Rotating Vibrator
    Masatoshi TOYAMA, Chikashi OTANI
    Article type: Article
    1991 Volume 138 Pages 22-32
    Published: September 20, 1991
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.138.0_22
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    This paper describes some characteristics of a tuning fork type vibrator when rotated around its central axis. Under such condition, subvibration occurs owing to Coriolis' force which is proportional to angular velocity. The sensitivity of Occurrence of subvibration for angular velocity and shape of output graphs recorded for subvibration amplitude against angular velocity are studied theoretically and experimentally. As a result the following is concluded:(1) The relative sensitivity is proportional to Ω/(Eω) where Ω is Ω-factor of the main vibratibn, E is Young's modulus, and ω is angular velocity. (2) Non-linearity of output graph depends mainly on residual sub-vibration in non-rotational state.
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  • Development of SCUBA MASTER
    Yukitoshi SAKO, Kenji SAKAMOTO, Takeo TSUNODA
    Article type: Article
    1991 Volume 138 Pages 33-41
    Published: September 20, 1991
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.138.0_33
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    The "SCUBA MASTER", a result of 25 years of work on diver's watches at SEIKO, is more than just a bathometer-equipped diver's watch. It is an instrument loaded with numerous useful features and functions that makes scuba diving safer. Moreover, our newly-developed system for measuring water depth, which satisfies all the size, weight, and feature conditions expected as a wristwatch, is resistant to temperature change and is highly reliable.
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1991 Volume 138 Pages 42-53
    Published: September 20, 1991
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.138.0_42
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1991 Volume 138 Pages 54-56
    Published: September 20, 1991
    Released on J-STAGE: November 09, 2017
    DOIhttps://doi.org/10.20805/tokeieafj.138.0_54
    JOURNAL FREE ACCESS
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