Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1985 Volume 114 Pages Cover1-
Published: September 20, 1985
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.114.0_Cover1

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[title in Japanese]

Article type: Cover
1985 Volume 114 Pages Cover2-
Published: September 20, 1985
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.114.0_Cover2

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Characteristics of Dynamic Torque on the Second-Hand of Clocks driven by Step Motor

Yasuo YOSHIMURA, Katsumasa AMADA, Yoshibumi IMAI

Article type: Article
1985 Volume 114 Pages 1-13
Published: September 20, 1985
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.114.0_1

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It is very difficult for engineers to measure directly and accurately small torques which vary dynamically during a short period of time. Occurence of such fine torques may be seen, for ezample, in the hands of clocks and some measuring ins truments. An original method of detecting such torques by using an optical device is stated in this paper. The device is composed of a line-sensor camera, a motion detector, a transient memory unit, a wave analyser, and a micro-computer. The characteristics of the dynamic torques on the second-hand of clocks driven by step motor are examined by this device. By changing some conditions such as source voltage, posture, and some defects of the gear train of clocks, typical characteristics of the dynamic torque s are obtained. From the view point of rationalization of quarity inspection of products, results given here are consideted very useful for checking clocks whether they are running normally or not.

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Time Scale of NRLM in the Results of International Time Comparison and Analysis of Factors in Frequency Instability

Tadao INOYE, Makoto NARA

Article type: Article
1985 Volume 114 Pages 14-25
Published: September 20, 1985
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.114.0_14

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Results of international time comparison of clocks in the National Research Laboratory of Metrology (NRLM) have been published since 1980 in the Annual Reports of the Bureau International de l'Heure (BIH) , in UTC (BIH) minus UTC (NRLM). According to these results, it is recognized that the frequency stability of NRLM clocks has been improved from year to year, while the environmental conditions of the clocks in room temperature and relative humidity have been also improved since 1980. In Order to analize the instability sources, data in the BIH Annual Reports and those of domestic time comparison made by the TV method are used. After eliminating separable factors included in these data, it is found that the most part of instability is attributed to the international time comparison, but not to the NRLM clocks themselves due to imperfection of the environmental conditions. Instability of the former is estimated as 3.5×l0^(-13)/√τ (l0 days ≦ τ ≦ 80 days), and the latter as 0.6×10^(-13)/√τ (7 days ≦ τ ≦ 100 days) for 1983.

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Application of CAD System to Watch Design

Koji YAMADA, Yoshiaki HAYASHI

Article type: Article
1985 Volume 114 Pages 26-34
Published: September 20, 1985
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.114.0_26

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Recently, in many industries the CAD/CAM system is used widely. However, it is difficult to apply CAD/CAM system to design tasks. This paper describes an application of CAD system to vlatch design, especially to a design check sub-system, which is able automatically to check profile of part in the drawing. By this system, our CAD system has grown powerful for new design tasks.

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"No-Battery" Analog Quartz Watch

Takehide YAMADA, Motoyuki FUJIMORI, Tomoo UEDA, Teruo SAKURAI

Article type: Article
1985 Volume 114 Pages 35-49
Published: September 20, 1985
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.114.0_35

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Development of a "no-battery" analog quartz watch is reported in this paper. The basic theory of this watch is that photoenergy is converted into electric energy and stored in a capacitor, and modules are driven by this energy. When the theory was first put into practice, there were some problems to be solved. The problems were overcome by developing some new devices such as a) an a-Si solar cell which is highly efficient, b) a miniature condenser with large capacitance, and c) a motor which operates at low power within a wide voltage range. Introduction of these devices resulted in the development of a dressy no-battery analog quartz watch. After being charged with sunlight for about 3 minutes, the watch can work for two days without any other power supply. Theoretically, the technology used here should operate the watch endlessly.

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...

Article type: Article
1985 Volume 114 Pages 50-91
Published: September 20, 1985
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.114.0_50

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[title in Japanese]

[in Japanese]

Article type: Article
1985 Volume 114 Pages 92-97
Published: September 20, 1985
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.114.0_92

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