Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1983 Volume 105 Pages Cover1-
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_Cover1

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[title in Japanese]

Article type: Cover
1983 Volume 105 Pages Cover2-
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_Cover2

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[title in Japanese]

[in Japanese]

Article type: Article
1983 Volume 105 Pages 1-2
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_1

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Automated Data Acquisition System for Timekeeping in NRLM

Makoto Nara, Tadao Inouye

Article type: Article
1983 Volume 105 Pages 3-18
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_3

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This report describes the outline of an automated data Acquisition system introduced recently for the timekeeping at the National Research Laboratory of Metrology (NRLM), where the realization of SI Second has been performed by evaluating the accuracy of primary frequency standards. In order to contribute to the formation of UTC (Coordinated Universal Time) performed by the BIH (Bureau International de l'Heure) and to examine the degree of agreement between our Second and those of other laboratories, the atomic time scale of the NRLM has been compared with those of foreign laboratories by Loran-C waves and with domestic ones mainly by the TV line-lO method. For these comparison as well as mutual time comparison among atomic clocks in the NRLM, a new measurement system composed of a minicomputer and controllable apparates has been constructed which can acquire the various time comparison data in sequence without any manual operation, at the NRLM in the new site of Tsukuba Science city the move to which had been made in 1980. The minicomputer controls VHF switches to select a pair of time signals to be compared from receivers and clocks one after another and to feed it to a time interval counter, where time difference between time signals in each pair is measured and then stored on a magnetic tape cartridge in the minicomputer

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On the Output Torque of Stepping Motor for Timepiece

Akio ISHIZAKA, Tomio KOTAKI

Article type: Article
1983 Volume 105 Pages 19-32
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_19

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Stepping motor has been employed for time piece as the transducer which converts an electrical time signal into an angular displacement. In this paper, the mathematical expression of the output torque of the stepping motor is introduced for the design of the motor. The output torque is devided into motor torque and index torque. The motor torque means the one induced through the magnetic field by coil carrent, and the index torque means the one induced through the magnetic field by rotor magnet it self. (1) By applying the magnetic circuit theory, the expression of the motor torque is deduced as follows; M_m=(πJ_0ρ^2hsn 1)/(2a) (1) where Jo is the permanent magnetization of the rotor magnet, ρ the radius of the rotor, hs the thickness of the stator, a the radius of the stator hole, n the number of windings, I the coil current. (2) The expression of the index torque of the stepping motor which has two semicircular notches in the stator hole is deduced by combining the dimensional analysis and the finite element method, as follows; M_i=(J^2_0ρ^r^2hs)/(μ_ra^4) (2) where μ_r is the recoil permeability of the magnet and r the radius of the notches. α≒1.7 is determined experimentally. (3) Introducing the deviated area S from the circular shape of the stator hole into the expression (2), the similar expression of the index torque corresponding to the other shapes of the stator hole is obtained as follows; M_i=(βJ^2_0ρ^4Shs)/(μ_ra^4) The above expression is ascertained by the numerical calculation using the finite element method about the motor with the various shapes of the stator hole. β≒0.5 is determined experimentally.

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THE MICROPROCESSOR LSI FOR DIGITAL QUARTZ WATCH WITH DOT MATRIX DISPLAY

Y Wakai, T. Orii, Y. Yokozawa

Article type: Article
1983 Volume 105 Pages 33-46
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_33

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A microprocessor (CPU) LSI for optional application to the digital elctronic watches has been developed. This LSI features the hardware for a large- capacity display using dot matrix. The power source is the Li-battery and the power consumption is about 1.5uk. The LSI fabrication process is a Si - gate LOCOS Process, thereby ensuring the reliable performance of the CPU functions.

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THERMAL BEHAVIOR OF ALIGNING AGENTS FOR POLYMER FILM LCD

H. Inoue, K. Uehara, A. Kikuyama

Article type: Article
1983 Volume 105 Pages 47-53
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_47

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We found a novel and useful technique for getting stable homogeneous (Planar) liquid crystal molecule alignment on the polymer films. We report the LCDs whose containers are composed of polymer materials without any glass plates; they have advantages for their thinness and flexibility. In this paper the emphasis is placed on the aligning agents suitable for expecially polymer film.

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ACCUMULATED TIME ERROR OF QUARTZ CRYSTAL WATCH

Hitohairo FUKUYO

Article type: Article
1983 Volume 105 Pages 54-70
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_54

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The watch industry has been trying to produce highly accurate watches keeping the time error within a few seconds during more than one year. However, the production seems not to be so easy because of the difficulty of reducing the complicated time error. The author has daily been measuring the accumulated time errors of some typical "accurate" watches for more than two years. He has found from the experimental results that the time error is composed mainly of the annual variation related to the penodic seasonal temperature change and the simple accumulation with constant rate. On the basis of this consideration, the accumulated time error is analyzed theoretically under some assumptions, and the analytical process and results are described in this paper. It should be noted that the calculated time errors agree well with the measured errors, and that the procedure of the proper frequency adjustment is established. By applying the analytical results obtained here to the watch production, the abovementioned accurate watches may be produced in the near future.

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[title in Japanese]

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

Article type: Article
1983 Volume 105 Pages 71-101
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_71

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[title in Japanese]

[in Japanese]

Article type: Article
1983 Volume 105 Pages 102-104
Published: June 25, 1983
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.105.0_102

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