Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1984 Volume 110 Pages Cover1-
Published: September 25, 1984
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.110.0_Cover1

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[title in Japanese]

Article type: Cover
1984 Volume 110 Pages Cover2-
Published: September 25, 1984
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.110.0_Cover2

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High Accuracy Miniature Quartz Resonator

Kunihiro TAKAHASHI, Nobuyoshi MATSUYAMA

Article type: Article
1984 Volume 110 Pages 1-23
Published: September 25, 1984
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.110.0_1

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We developed a quartz tuning fork for wrist watches by utilizing the coupling between the fundamental mode of flexture and that of torsion. We show here how to adjust the frequency and the frequency temperature characteristic of main mode (flexure mode) by increasing or decreasing the weights at the tops of the tuning fork arms. As a result, we have obtained a very small and highly accurate resonator with very simple supporting structure. The frequency change of this resonator is less than ± 1 ppm in a temperature range from - 10℃ to 50℃. We expect that this resonator can be used for small portable communication instruments or the like as well as for wrist watches.

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A Study of the Effects of Varios Factors on Characteristics of the PM Stepping Motor

Akira TAKAHASHI, Kenji MATSUI, Hajime SUZUKI

Article type: Article
1984 Volume 110 Pages 24-37
Published: September 25, 1984
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.110.0_24

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In this paper, the characteristics of the PM stepping motor having an axially magnetized disk-rotor are reported. As compared with the conventional type of stepping motor having a radially magnetized cylindrical-rotor, the stepping motor with the disk-rotor as reported here is possible to have much more torque output. Among the factors affecting the characteristics, it is most important to control the geometrical precision in axial direction.

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System of CITIZEN BIO. SPORTS

Tomomi MURAKAMI

Article type: Article
1984 Volume 110 Pages 38-47
Published: September 25, 1984
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.110.0_38

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Recently many people have a growing interest in good health. The Citizen Watch Co. has developed a watch named "CITIZEN BIO.SPORTS" which is useful for the promotion of health. The CITIZEN BIO. SPORTS contains two sensors, the one is a pace sensor (piezo-electric acceleration sensor) for the detection of running or jogging pace and the other is a pulse sensor (photocoupler) for detecting the user's pulse. By use of the running pace data detected by the pace sensor, the aerobics points available for health care and the consumed calories are calculated. The system for the calculation and the structure of each sensor are described here.

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Development of Wrist Computer System

Kazuhiro ASANO, Yasuo SAKAMI, Hiroyuki WATANABE, Yoichi FUJOKA

Article type: Article
1984 Volume 110 Pages 48-72
Published: September 25, 1984
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.110.0_48

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We developed a wrist computer system called UC-2000 family. The UC family consists of four parts ; a Central digital Wrist Watch (UC-2000), a Key Board (UC-2100), a Controller (UC-2200), and an Interface Adopter (UC-2300). The UC-2000 has a 2 K bytes CMOS static Ram within a compact body, which memorizes 2000 characters and also executes stored program, and has a wide full-dotted liquid crystal display. Further, we adopted an originative wireless transmitting method for data communication.

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Stability of 1/f Frequency Fluctuations and Q-Value

Masatoshi TOYAMA

Article type: Article
1984 Volume 110 Pages 73-80
Published: September 25, 1984
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.110.0_73

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Relations between stability of frequency fluctuations caused by internal friction and Q-value are described. It is known that crystal defects - points defects, surface defects, dislocations, and interractions of these phenomena - cause internal friction, and that there are marly kinds of mechanisms in internal friction, that is, relaxation type, resonance type, hysteresis type and so on. In this paper, relaxation type - standard linear solid model - is mainly discussed. If some assumptions are put about relaxation time of density fluctuations of crystal defects, power spectrum of frequency stability is so-called 1/f type. Furthermore, using the experimental results of relations between characteristics of power spectrum of frequency stability and Q-value, and on the assumption that power spectrum consists of three parts - 1/f, 1/f^2, and white-, the result that frequency stability is pro-portional to O^(-2) is obtained.

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[title in Japanese]

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

Article type: Article
1984 Volume 110 Pages 81-92
Published: September 25, 1984
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.110.0_81

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