Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1983 Volume 104 Pages Cover1-
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_Cover1

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[title in Japanese]

Article type: Cover
1983 Volume 104 Pages Cover2-
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_Cover2

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Application of Superplastic Zn-Al Alloy (SPZ) to a Watch Dial

Minami Kimura

Article type: Article
1983 Volume 104 Pages 1-12
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_1

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Superplastic Zn-21% Al- O.5% Cu-0.01% Mg alloy (SPZ) was applied to a one-piece watch dial which combined indexes, markings, hairline-like surface relief and feet. Two watch dial forming processes were developed in super plastic isothermal conditions. 1 Load and un-load cyclic forging process. 2 Constant load holding process. This forming cycle combines an approach at constant speed followed by a dwell at constant load. The results were obtained as follows 1) The one-piece watch dial formability was increased by the number of load and un-load cycles at the cyclic forging and holding time of constant load. 2) The formed one-piece watch dial has been exhibited good face and high accuracy for 1.5 years.

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The Influence of Solidification of High- Polymer on Frequency and Amplitude of Vibrator

Chikashi Otani, Masatoshi Toyama

Article type: Article
1983 Volume 104 Pages 13-25
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_13

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According to solidification of an adhesive, changing of frequency and amplitude of a vibrator configured as plate is discussed here. A steel ball is adhered to the vibrator with an adhesive and the frequency and amplitude dating from adhering time point are measured. Both frequency and amplitude increase and after 1800-2000 seconds from the adhering time point, they become stable. These data are about the same with data of adhesion given by manufacture of above adhesive. After the complete of solidification, slowly transition phenomena as above can not be observed. So the slow transition phenomena is due to the solidificating process. About changing of frequency, it is explained qualitatively by assuming some simple mechanichal model. In conclusion, some physical properties of visco-elastic substances will be able to be measured by means of vibration which is easy to measure.

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Positive Type Scattering Mode Guest Host LCD

Nobuhiro Kondo, Masanori Fujita

Article type: Article
1983 Volume 104 Pages 26-35
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_26

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A positive type guest-host display using scattering mode is surveyed. This display can be made of a homeotropically aligned nematic liquid crystal with negative dielectric anisotropy which contains the dichroic dye and ion compounds. The investigation of the birefringence of the liquid crystal, the dielectric anisotropy of the liquid crystal, the concentration of the dye, and the applied voltage dependence of the contrast ratio are made. As a result high contrat positive type guest-host display is obtained by hosts of low birefringence using SHS mode, and multiplex driving higher than 1/7 duty is realized by hosts of which dielectric anisotropy are higher than -0.4.

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MINIATURIZED GT-CUT QUARTZ RESONATORS

Hirohumi Kawashima, Osamu Ochiai, Akihito Kudo, Atsunobu Nakajima

Article type: Article
1983 Volume 104 Pages 36-48
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_36

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This paper describes the shape, size and frequency-temperature characteristics of a miniaturized GT cut quartz resonator. We have developed a new GT cut quartz resonator, which is greatly miniaturized, highly shock resistant and has excellent frecuency-temperature characteristics over a wide temperature range. In order to obtain sufficient processing accuracy, this quartz resonator is manufactured by a litho-graphic prosess. The optimum shape and size for this quartz resonator have been analyzed by the finite element method. According to the result of the analysis, we have manufactured resonators. This paper also describes how to adjust resonant frequency of a width-extensional vibration and frequency-temperature coefficients of a GT-cut quartz resonator. A coupling condition between two vibrational modes is almost determined by a cut angle and a ratio of width to length, so-called, a dimensional ratio. It is, however, impossible to avoid a distribution of the resonant frequency and the frequency- temperature coefficients caused by manufacturing. Therefore, we have been making a study of how to adjust the frequency-temperature coefficients, by adding weights on a vibrational portion, or eliminating weights of the vibrational portion, and simultaneously, how to adjust the resonant frequency of the width-extensional vibration mede.

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An application of SITL to 2MHz-Ouartz Watch IC

E. Iwanami

Article type: Article
1983 Volume 104 Pages 49-57
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_49

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2MHz watch IC has been developed by using SITL (Static Induction Transistor Logic) which has the smallest power-delay product in Sitechnology Circuitry is composed of SITL digital circuits and bipolar peripheral circuits basically manufactured by a bipolar IC process, where an epitaxial layer with impurity concentration of 1×10^(13) atoms/cm^3 is used and self- alignment technology is applied in order to form the gate and drain of SITL. A quartz oscillator and SITL digital circuits are driven by a bipolar current constant circuit. Dividers of SITL have 2-layer stacked- ircuit structure to utilize battery voltage efficiently. As the collector break down voltage of npn transister incorporated is high, the SITL IC is promising for the mixing digital and linear circuits

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THE MINIMUM TURN-ON VOLTAGE OF COMS CRYSTAL OSCILLATOR IN ELECTRONIC WRIST WATCH

He Yong-Jiang, Song Guang-de

Article type: Article
1983 Volume 104 Pages 58-65
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_58

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Based on the characteristic of circuit current with exponential function in the weak inversion region of CMOS inverter, a precise formula for the calculation of trun-on voltage of oscillator is derived in this paper. The influence of trun-on voltage caused by various parameters of oscillator is discussed. Finally is found an investigation of optimum value selected hy trun-on voltage. Furthermore with regard to fulfil simultaneously the requirement of frequency stability with power dissipation, selection of circuit parameters has heen furnished.

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Current Dissipation of CMOS Crystal Oscillator

He Yong-jiang, Du Yong-tai

Article type: Article
1983 Volume 104 Pages 66-78
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_66

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In this paper, relationship of current dissipation with parameter of circuit is discussed. Relative function of through current with conduction angle is derived and finally formulas for the calculation of through current and load current are suggested. Power dissipation of crystal and the efficiency of oscillator are discussed. so far as based on this method of calculation, an improved circuitry for lower current dissipation is analyzed.

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An Investigation on the Symmetricity of Airy's Formula

[in Japanese]

Article type: Article
1983 Volume 104 Pages 79-84
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_79

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A period of a linear oscillator excited by an impulse is calculated by Airy's formula. If the impulse is executed at the time just after the oscillator passes its zero point, the period of the motioo becomes longer than its natural period. If the impulse is executed at the time just before reaching its zero point, the period becomes shorter than itsnatural one. Airy's formula has a symmetrical form on the position of the impulse whether it exists before or after the time of zeropoint. This symmetricity is examined from the viewpoint of exact calculation.

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[title in Japanese]

[in Japanese]

Article type: Article
1983 Volume 104 Pages 85-93
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_85

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[title in Japanese]

[in Japanese]

Article type: Article
1983 Volume 104 Pages 94-101
Published: March 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.104.0_94

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