Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1976 Volume 78 Pages Cover1-
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_Cover1

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[title in Japanese]

Article type: Cover
1976 Volume 78 Pages Cover2-
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_Cover2

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[title in Japanese]

[in Japanese]

Article type: Article
1976 Volume 78 Pages 1-17
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_1

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Ruthenium Plated Watch Case

Akimi Terayama, Tomoyuki Aoki

Article type: Article
1976 Volume 78 Pages 18-32
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_18

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Stainless steel case and precious - metal covered cases have been widely adopted as watch cases. Both cases have a high quality of corrosion resistance in common, however, they are readily scrached due to relatively low surface hardness, thus leaving somewhat to be improved. We, authors, have noticed Ruthenium which meets our objective to improve the surface hardness and have succeeeded in both the development and quantity productlon of oue new watch case wlth the brand name of "Miracle Hard Case" in which its performance as well as aestetic appearance have been upgraded by means of the electrodeposition of Ruthenium. The Miracle Hard Case resembles hard alloy cases in color tone and it has ex-cellent wear -resistance, i.e., 4 to 5 times as much as gold plated case. Furthermore, it also offers excellent corrosion resistance. Designing is restricted for the hard alloy cases while the Miracle Hard Case can provide vefsatile case designs since it can use easy-to-process base metal. Ruthenium electrolyte is mainly composed of the complex featuring Ru-N bond-ing and lt exhibits excellent cathode efficiency although its electrochemtal behavior is complicated. This paper reviews properties of Ruthenium, characteristics of its electrolyte, and the quality of Ruthenium plated watch case, respectively.

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Quartz Crystal Clock Servo-Controlled to VLF

Toshihide SAMEJIMA, Tetsuro KONNO

Article type: Article
1976 Volume 78 Pages 33-52
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_33

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The general consideration of "Phase-Locked Loop by use of the sampled data control" is descrived especially on the digital sampling and holding system of the phase difference between the VCO as local standard and the reference VLF wave. An investigation is made on the mathematical treatment and the numerical calculations, with respect to the responses of the theoretically derived model. According to this results, the system parameters of loop gain, time constant, sampling time, and settling time are determined. It is proved that the holding system of VCO has a good stability when reference VLF wave is off the air, and that the aging auto-compensation system operates satisfactorily against a long term frequency drift. Several recorder charts observed in practice to detect the fractional frequency errors are shown, which prove this equipment functions as expected in accordance with the design factors.

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Effect of Elasticity of the Base upon the Rate of Mechanical Vibrator Clock

Takemitsu AYA, Tomio KOTAKI

Article type: Article
1976 Volume 78 Pages 53-63
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_53

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The rate of mechanical vibrator clock varies with the elasticity of the base on which the clock is placed. This phenomenon is analyzed here theoretically. As the result of this analysis, it is found that the rate of the clock changes discretely when the natural frequency of the base coincides with that of the mechanical vibrator. The natural frequency of the base is introduced in this case as a measure of elasticity of the base. Such a discrete rate change is most predominant among all the rate changes caused by the elasticity of the base. The analysis is also tried on the clock equipped with suspension spring bet-ween the mechanical vibrator and the clock case. The discrete change of the rate is represented by a simple formulae which snows that the suspension spring is very effective to diminish the amount of the discrete rate change. Theoretical results as above - mentioned are confirmed by the experiment made with an equipment whicn represents the models of the mechanical vibrator clock and the base.

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[title in Japanese]

[in Japanese]

Article type: Article
1976 Volume 78 Pages 64-71
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_64

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[title in Japanese]

Article type: Article
1976 Volume 78 Pages 72-
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_72

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[title in Japanese]

[in Japanese]

Article type: Article
1976 Volume 78 Pages 73-75
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_73

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[title in Japanese]

[in Japanese]

Article type: Article
1976 Volume 78 Pages 76-80
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_76

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[title in Japanese]

Article type: Bibliography
1976 Volume 78 Pages 81-
Published: September 15, 1976
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.78.0_81

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