Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1981 Volume 96 Pages Cover1-
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_Cover1

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[title in Japanese]

Article type: Cover
1981 Volume 96 Pages Cover2-
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_Cover2

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Some Considerations on Airy's Theorem

Yasuo Jimbo, Shinya Sekimoto

Article type: Article
1981 Volume 96 Pages 1-14
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_1

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A period of a linear oscillator excited by a force is calculated. If the damping of the oscillator is small and the force exists only in a short interval near zeropoint Airy's formula can be used. Periods through Airy's formula are calculated and are compared with exact ones for several forms of exciting force, that is pure pulse, full sine form, triangular form, half sine form and square form. Equation (9) is a formula to calculate an exact period.

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A Measuring Method of Equivalent Circuit Parameters of 4 MHz Crystal Resonator Unit.

S. Watanabe

Article type: Article
1981 Volume 96 Pages 15-24
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_15

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A Measuring method is proposed which enables efficient determination of 4 equivalent circuit parameters of crystal resonator unit. and this paper presents that the measuring method called "RT3 Method" is handy and applicable to some other measurments.

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New Quartz Tuning Fork

Shigeru Kogure, Eishi Momosaki, Tetsumi Sonoda, Minoru Inoue

Article type: Article
1981 Volume 96 Pages 25-54
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_25

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In order to realize the electronic wristwatches with high accuracy and low power consumption, we developed the new quartz tuning fork which features the cubic frequency temperature characteristics in the vicinity of the room temperature. The important points are mentioned below, (1) M-cut ( M_1-, M_2-, M_3-, M_4-cuts) must be used. This angle of cut was predicted theoretically with the finite element method. (2) The flexural mode must be coupled with the torsional mode. When the fundamental vibration of the flexural mode is coupled with the fundamental vibration of the torsional mode, the change of resonance frequency is about 1 ppm in the temperature range from 0℃ to 7O℃. The frequency temperature characteristics of this resonator disperse due to the dispersion of the angle of cut and the dimensional dispersion resulting from the manufacturing processes. Therefore, we used the Ist overtone of the flexural mode instead of the fundamental vibration of that in order to compensate the dimensional dispersion which dominantly affects the frequency tempetature characteristics, and established the adjustment method of the frequency temperature characteristics.

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Driving Method for Grarphic Liquid Crystal Display

Masanori Fujita

Article type: Article
1981 Volume 96 Pages 55-75
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_55

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Various driving method for liquid crystal hands to display simultaneously three timekeerping parameters, e. g., hour, minute and second, are proposed in this paper. They are evaluated by the driving margin and complexity of driving circuit respectively. The driving margin in these method attains to 1. 9, and this value is large enough for practical use. The large margin and the simple circuit are achieved by "DYNAMIC DRIVE" method. The large margin and the low applied voltage are achieved by "STATIC MULTIPLEX" method or "MULTI SCANNING" method. Further, newly developed driving wave forms for the bargraph displays and the time dial displays afe proposed. Thus, LC clocks with three hands and bargraph displays are realized.

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Dynamical Behaviours of the Wrist under Various Actions of the Arm

Genrokuro NISHIMURA, Kouichi OZAKI

Article type: Article
1981 Volume 96 Pages 76-90
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_76

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From the view of the human engineering, it is useful to study the torsional acceleration of the wrist under various actions of the arm Using cross-spring torsional pendulum, three kinds of torsional vibration pickup (T. V. P) of high natural frequency are made. The theoretical natural frequency f_nt of the T. V. P is as follows. f_nt=1/(2π){(32bt^3)/(WD^2l)((r^2)/(l^2)E+k_2G)・g}^1/2 in which E; the Young modulus of plate spring, G; the rigidity of plate spring, W; the weight of the pendulum of circular disc, D, the diameter of the pendulum, g; the acceleration of gravity, r; the distancc from center of the pendulum to that of plate spring, k_2 ; the shape factor of plate spring, and b,t,1; width, thickncss, length of the plate spring respectively. The experimental values of natural frequency f_nof the three kinds of T.V.P agrce very well with the theoretical ones f_nt. Under various actions of the arm, the time variations of the torsional acceleration of the wrist are obtained by the present T.V.P, Rlnd they are discussed respectively in this Paper

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[title in Japanese]

Article type: Bibliography
1981 Volume 96 Pages 91-
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_91

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[title in Japanese]

[in Japanese]

Article type: Article
1981 Volume 96 Pages 92-103
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_92

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...

Article type: Article
1981 Volume 96 Pages 104-125
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_104

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[title in Japanese]

Article type: Bibliography
1981 Volume 96 Pages 130-
Published: March 25, 1981
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.96.0_130

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