Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1979 Volume 88 Pages Cover1-
Published: March 10, 1979
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.88.0_Cover1

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[title in Japanese]

Article type: Cover
1979 Volume 88 Pages Cover2-
Published: March 10, 1979
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.88.0_Cover2

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Impulse Excited Stationary Motion of a Vibrator which Dissipates Energy from its Supporting Point

Yasuo JIMBO, Junko HASHIMOTO

Article type: Article
1979 Volume 88 Pages 1-11
Published: March 10, 1979
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.88.0_1

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In case an Impulse excites a vibrator to maintain its vibration, the period of the viblation is calculated through Airy's formula. If the impulse is given at an instant where the mass of the vibrator passes its zero point, the period of the impules excited vibration becomes same with that of the free damped vibration. Is the above statement also correct when the damping is due to energy flow from the supporting point ? This is the problem that should be made clear in this article. If the supporting point is perfectly rigid, no energy flow occurs from that point. In this problem energy flow from the supporting point is assumed, and therefore the supporting point may move a little. From this stand point our supporting point is replaced by a large mass with certain quantity of stiffness and damping. Then the motion of the vibrator ooupled with the movement of its supporting point becomes a system of two degrees of freedom as shown in Fig. 3. Now the system excited by an impulse can readily analysed. The result shows that the Airy's theorem should be modified a little. In this system, if the impulse is given at an instant where the mass of the vibrator passes through a certain point given by equation (25) the period of the impulse excited vibration becomes same with that of the free damped vibration.

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Motion of Step Motor in Time Piece : Part 3

Akio ISHIZAKA, Akio TAJIMA, Tomio KOTAKI

Article type: Article
1979 Volume 88 Pages 12-28
Published: March 10, 1979
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.88.0_12

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On the influences of the residual magnetization of the stator and the rotor phase angle for the stability of the step motion and the efficiency of the step motor, an analytical study Was made by applying the simulation method with computer. The results obtained and the reason why they are caused are stated in this report. The results are summarized as follows: By the use of the stator material having a residual magnetization characteristic, the step motion is not only stabilized but the efficiency is also improved. The rotor phase angle influences mainly for the efficiency of the motor but less for the stability of the step motion.

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Charging Circuits for Sealed Silver Oxide Cells by Solar Cells

Shoji Koike, Akira Kikuyama

Article type: Article
1979 Volume 88 Pages 29-38
Published: March 10, 1979
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.88.0_29

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Rapid advances in the field IC, displays, misromotrs, etc. have provided reduction in size and power consumption of portable electronic equipments. This necessitates power sources to be smaller in size and larger in capacity. For this reason, hybrid power source systems consisting of solar cells and sealed silver oxide-zinc cells have received wide attention. From these viewpoints, this paper describes the method of charging sealed silver oxide-zinc cells and the charging systems by solar cells. Asan application of such systems, RIQUARTZ 810 that RICOH Watch Co., Ltd has recently developed to realize a thin and long life watch, is also explained.

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Develoment of the Caliber 790, Extremely Thin Analog Quartz Watch___-

Yasuaki Nakayama

Article type: Article
1979 Volume 88 Pages 39-52
Published: March 10, 1979
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.88.0_39

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This article describes the Caliber 790, the first analog quartz watch with a movement less than l mm in thickness. Design features and fabrication process which made possible the realization of extreme thickness include:(1) Electronic circuit section Reduced thickness of quartz oscillator, low power consumption of oscillation circuit, and stable production of quartz oscillator piece and IC Package. (2) Converter section Uniform momentary output torque of rotor, and special process for handling magnetic material (soft magnetic iron or alloy) and securing magnet to the rotor. (3) Mechanism section Hand setting mechanism which functions in the same way as a mechanical watch but has a different construction philosophy, and enhanced manufacturing accuracy of reduction gears.

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Report on Test method for "Shock resistant" wrist watches___-

Masao TANAKA

Article type: Article
1979 Volume 88 Pages 53-54
Published: March 10, 1979
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.88.0_53

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Regarding to the quality standard and test method for wrist watches bearing the mention "Shock resistant", international work on this subject was commenced in 1965 by ISO. And, in 1973, International Standard on this subject have been established and published as ISO 1413 "Shock resistant wrist watches". At present, this International Standard have been used widely, for example, through being introduced to national standards of many countries. New proposal on test method, hower, was presented from Switzerland to ISO last year. ISO decided that member bodies are asked to examine the test method based on Swiss proposal. According to this resolution, we carried out experiments on test methods for shock resistant wrist watches. From the results, the following conclusions may be deduced. 1) Residual effect and damage rates by shocks in the two tilted positions [figure] are much lower in comparison with those in the horizontal and vertical positions [figure] under the ISO n0w in force. The tow tilted positions exert little influence. 2) There is no characteristic result by shocks in these two tilted positions. We do not think, therefore, it is necessary to make tests in the two tilted positions. 3) Evident cumulative effect of shocks are not observed wholely, but as to some individual sample, this effect is observed. Therefore, it is better to make tests successively in two horizontal and vertical positions provided in the present ISO. The text of this paper. is eliminated here, as the whole results are already published on the Annual Report of Study and Research of JHI for 1977, to which the reders are requested to refer.

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[title in Japanese]

[in Japanese]

Article type: Article
1979 Volume 88 Pages 55-75
Published: March 10, 1979
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.88.0_55

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[title in Japanese]

[in Japanese]

Article type: Article
1979 Volume 88 Pages 76-
Published: March 10, 1979
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.88.0_76

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