Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1980 Volume 94 Pages Cover1-
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_Cover1

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[title in Japanese]

Article type: Cover
1980 Volume 94 Pages Cover2-
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_Cover2

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Development of a Plano Convex AT- cut Quartz Resonator for wrist Watch

Junichi YOSHIDA, Kazuhiro HORIUCHI, Yohichi MATSUBARA, Akira KIKUYAMA

Article type: Article
1980 Volume 94 Pages 1-13
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_1

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This paper concerns with the development of a 4.2 MHz miniature AT-cut quartz resonator for a high accurate wrist watch. Although its diameter is only 4.0mm, the resonator of pure thickness shear mode can be found by being formed in a plano convex shape of a specific curvature. A supporting method only at a side face gives a good resistance against shock for a watch, keeping its low Cl value and its high Q value. And a flat frequency temperature characteristic has been found at a specific cutting angle. Finally this resonator is assembled in a wrist watch and is measured its frequency aging characteristic and the accuracy of a watch under a normal wearing experiment. As a result, it has a good aging characteristic of within l ppm in one year and the indicating error of a watch is within 5 seconds in one year. So it confirms that it is possible to produce such a high accurate watch as 5 seconds deviation in one year.

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Wide Range Temperature Compensation of Small Size Quartz Watch Using Two Capacitors

Ryo Toyokuni

Article type: Article
1980 Volume 94 Pages 14-25
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_14

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We have realized the production of a small size, high accuracy quartz watch by developing a new method of temperature compensation and a new material to be used for this new method. (1) Development of new ceramic material for temperature compensation capacitor, having excellent aging property. The structural formula is as follows. (Ba. Sr. Mg) TiO_3 + R_2O_3 R; rare earth element (2) New method of temperature compensation, using two capacitors which are made of this material and have different Curie Points one another. Thus, the accuracy of the small size Caliber 26 was improved to±5 s/month.

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On Q-Value of a Linear Oscillator : 2 nd Report

Masatoshi Toyama, Chikashi Otani

Article type: Article
1980 Volume 94 Pages 26-34
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_26

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The effects of Q-value and changing of angular frequency to the frequency stability of a linear oscillator are described here. When an external force in R_0exp(i∫^t_0ω(t)dt) (ω(t)=ω_0+ω_1(t),ω_0 : resonance angular frequency of the oscillator, ω_1(t) : random variable angular frequency) exerts on the oscillator with the resistant force proportional to its velocity, calculation is tried by ai ds of statistical method. And the following result is obtained. s(Q)=√<1/(2Q){e^-δ^2(1/(2Q)+δσ/ω_0)-1/(2Q))}> where s(Q) is the fractional frequency stability of the oscillator, σ is the variation of ω_1(t) and δ is the product of σ and τ_c which is figure corresponding to change of ω_1(t)

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Development of Analog Quartz Watch

Eiichi Matuura, Tadashi Otani

Article type: Article
1980 Volume 94 Pages 35-46
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_35

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The Analog Alarm Quartz Watch 7223 is easy to operate and rings precisely on the time set. This Caliber is developed first in the world for customer who likes to have an analog watch. (Novenber 1979) The most important point in the development of this watch is to minimize the variation of the contacting time of alarm contact points that is to set the contacting time of alarm contact points correctly between the standard pulse signals for alarm (Five-minute interval) given out from the electric circuit. This alarm system is so designed that it sings when the first standard alarm pulse signal is generated after the closing of alarm contacts.

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[title in Japanese]

[in Japanese]

Article type: Article
1980 Volume 94 Pages 47-63
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_47

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At the time when the quartz watch was introduced into the market, the primary aim was to secure its function and reliability. Whiele its accuracy was, from the outset, greatly higher than that of the mechanical watch, the appearance, which is a requisite feature for wrist watch, was not so favorable, being thick and large in size, due to the larg volumetric size of the electronic components. After securing the function and reliability, in minimum limit, which are required as the commercial product, the aim was pointed to the improvement of size and performance of every component part. For instance, the size of quartz crystal oscillator was made smaller from 4φ×12 (or 5×3×16) to 1.5φ×5mm. The circuit was multi-chip constituted of the oscillating circtlit, frequency dividing circuit, wave-from regulating circuit and driving circuit. And this was soon made into one-chip and the power consumptionn in cas of an analog Quartz, was decreased from 5 to 0.2μA The power consumption of stepping motor at the one second step running decreased from l0 to 1μA

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[title in Japanese]

[in Japanese]

Article type: Article
1980 Volume 94 Pages 64-73
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_64

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[title in Japanese]

[in Japanese]

Article type: Article
1980 Volume 94 Pages 74-76
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_74

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[title in Japanese]

[in Japanese]

Article type: Article
1980 Volume 94 Pages 77-78
Published: September 10, 1980
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.94.0_77

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