Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1977 Volume 80 Pages Cover1-
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_Cover1

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[title in Japanese]

Article type: Cover
1977 Volume 80 Pages Cover2-
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_Cover2

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A Lady's Dress Watch with a Quartz Oscillator

Kenichi Ushikoshi

Article type: Article
1977 Volume 80 Pages 1-13
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_1

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This paper relates to a lady's dress watch (caliber 47) in the analog display type with the quartz oscillator of which movement is the smallest one at present among the same kind of watches and is of nearly the same size as that of the usual 1 lady's mechanical dress watches. The movement has a casing diameter of 15.3 mm, a width of 13.6 mm in 3-9 H direction and a height of 3.8 mm. This paper describes the various techniques and consideration which have been applied to caliber 47 for the purpose of the improvement of the reliability and the minimization of the size, viz., the design of the micro quartz oscillator, the reduction of the power consumption of the oscillator circuit, the resitance for the external magnetic field on the open type stepping motor and the optimum condition for the stepping interval of the motor.

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Computer system of performance examination for assembled watches

Hiroichi Ohta, Jun Wakata

Article type: Article
1977 Volume 80 Pages 14-26
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_14

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Thi system is made with intention of improuing quality by examinating all assembled watches and decreasing men on examination lines by using minicomputer. We have succeeded designing new digital rate mesuring instruments with computer data transaction that have same rcliability with analogue rate mesuring instruments(for example Chrono Graphic Super made by Greiner Co.).

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Presumption of Wearing Accuracy of Quartz Crystal Watch : the 2nd report

Shojiro Komaki, Hiromasa Haniuda

Article type: Article
1977 Volume 80 Pages 27-47
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_27

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The rate of quartz crystal watch depends on the temperature, and the watches are usually used in the various temperatures. However, by using the simuration technique with the Monte Carlo method, it is possible to presume the average value and the standard deviation for the monthly rate of the wearing watches, taking into account a variety of the surrounding temperature, the characteristics of the quartz oscillator and the standards of the inspection in the factory. As a result of the application of the above method, it is found that the tempera-ture Tp of the turnning point on the frequncy-temperature curve of the quartz oscillator gives large effect on the seasonal variation of the monthly rate and that the condition for the minimization of the effect is Tp=18℃. Whereas, tha value of Tp taken in the usual crystal watch is 24℃. And, it is found that 97% of the watc-hes with Tp of 18℃ come into the range of ± 10 sec/month, without changes in the other characteristics of the quartz oscillator and the standards of the inspection in the factory. Under tha same condition, the range of ±15 sec/month was obtained for the crystal watches with Tp of 24℃.

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Characteristics of Quartz Crystal Watches under Various Environmental Conditions

Shoichi NAKANO

Article type: Article
1977 Volume 80 Pages 48-49
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_48

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A series of experiments for the research of behavior of quartz crystal watches under various environmental conditions was conducted by the author at the Japan Horological Ispection Institute (JHI) in 1975. The whole results of these experiments are already published elsewhere. Among these results, those on rate chages caused by the variation of the ambient temperature, in particular, were reported at the Autumnal Lecture Meeting of the Horological Institute of Japan held on 25 September 1975. In this report, the results of temperature-rate characteristics obtained by increasing and decreasing the ambient temperature were illustrated for several sampled watches equipped with and without thermal compensation. From the results the following conclusions may be deduced ; 1) Temperature-rate characteristics are different in various aspects between watches equipped with and those without thermal compensation, 2) Temperature-rate characteristics are different in high and low temperature ranges from each other, 3) It seems that there are two types of temperature-rate characteristics for watches equipped with thermal compensation, one is those under static condition and the other thos6 in practical use, taking into consideration the fact that watches cannot follow immediately but gradually to the change of ambient temperature, 4) Significant amounts of thermal hysteresis in temperature-rate characteristics are observed in high temperature range, in particular. 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 1975, to which the readers are requested to refer.

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[title in Japanese]

Article type: Bibliography
1977 Volume 80 Pages 50-
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_50

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[title in Japanese]

[in Japanese]

Article type: Article
1977 Volume 80 Pages 51-58
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_51

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[title in Japanese]

[in Japanese]

Article type: Article
1977 Volume 80 Pages 59-72
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_59

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[title in Japanese]

[in Japanese]

Article type: Article
1977 Volume 80 Pages 73-90
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_73

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[title in Japanese]

Article type: Index
1977 Volume 80 Pages 97-102
Published: March 15, 1977
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.80.0_97

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