Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1993 Volume 146 Pages Cover1-
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_Cover1

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[title in Japanese]

Article type: Cover
1993 Volume 146 Pages Cover2-
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_Cover2

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A Decordrer for Codes of LF Broadcast in Japanese Standard Time

Tadao INOUYE, Masaki TOBITA, Katsuichi TAKAHASHI

Article type: Article
1993 Volume 146 Pages 1-10
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_1

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A time codes decorder has been developed as an automatic indicator for time and date information, which consists of three main diruits made of standard logic ICs. Functions of these circuits are mentioned as follows : adetector for acquiring second and minute markers in Japanese Standard Time from LF broadcast signals, a converter of time code expressions from pulse width to pulse height level, and a distributor of time data in "Minute", "hour" and "Day", for latching according to assigned time slots. This decorder displays figures of time and data on seven segments indicators about two minutes after turning on the power switch. The time is shown in Japanese Standard Time, and the day is shown by "Day-Number", not by month and day in calendar. On the other hand, however, this decorder has a few unsatisfactory operations that renewal of time data indication does not occur all together with the change of data and hour, and no data are given daring the period when the channel is occupied by other communication.

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Frequency Temperature Behavior, Thermal Hysteresis and Aging Characteristics of Quartz Crystal Oscillators for High Precision Clock

Hirofumi KAWASHIMA, Kenji SUNAGA

Article type: Article
1993 Volume 146 Pages 11-22
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_11

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This paper describes frequency temperature behavior, thermal hysteresis and aging characteristics of quartz crystal oscillators for high precision clock using NS-GT cut quartz crystal resonators which are called self-temperature compensated crystal oscillators (S-TCXO's). The object of this paper is to clarify the frequency temperature behavior, its hysteresis and aging characteristics of the S-TCXO's. It is shown that a S-TCXO is successfully obtained with frequency deviation of + 30〜 -150 ppb at best over a wide temperature range of -30 to + 85℃, the thermal hysteresis is less than 0.38 ppm in frequency deviation, and then aging quantity after the pre-aging for about two weeks is 0.33 ppm at the mean value for one year and two months.

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The Influence on Resonant Frequency Due to the Weights Deposited on Two Arms of Quartz Crystal Tuning Fork-Type

Hirofumi KAWASHIMA, Kazuyoshi SUGAMA

Article type: Article
1993 Volume 146 Pages 23-34
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_23

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This paper describes the influence on resonant frequency for a flexural mode quartz crystal resonatior of tuning frok-type due to weights deposited on two arms. The objective of this paper is to clarify theoretically and experimentally a relationship of resonant frequency for fundamental and second overtone versus the weights deposited on the arms. An analysis is performed under the boundary condition of "clamped-free" because a flexural mode resonator of tuning frok-type can be regarded as a cantilever. A frequency equation and a transcendental equation are derived from the condition that width of the resonator is much smaller than length, namely, rotary inertia and shear force are neglected in this analysis. From the equations,a relationship of resonant frequency for fundamental and second overtine to the weights is calculated theoretically, so that the resonant frequency for fundamental is found to decrease markedly, as a length ratio and thickenss of the weights increase, while the resonant frequency for second overtone behaves different from that for fundamental to a variation of L_21.

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Development of Pulse Wave Velocity Measuring System

Takeo SUZUKI, Satoshi KINOSITA, Narutoshi MINAMI

Article type: Article
1993 Volume 146 Pages 35-41
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_35

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A new method of measuring blood pressure has been proposed, which is based on the relationship between blood pressure and pulse wave velocity that passes artery wall. We paid attention to this method as this one was very advantageous to miniaturize the blood measuring instrument. We have developed a circuit to measure pulse wave velocity which can be transduced into blood pressure value. Furthemore we have brought Casio brand blood pressuer monitor watch to the market, of which circuit is miniaturized into one chip LSI. The constitution and the blood monitoring operation of this watch are described in this Paper.

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Development of Self-Contained Microrobot "Monsieur"

Osamu MIYAZAWA, Nobuhiro KOIKE

Article type: Article
1993 Volume 146 Pages 42-50
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_42

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We have launched production and sales of "Monsieur", a microrobot that is probably the world's first micromachine to move from drawing board to factory floor. "Monsieur" employs an internalized CPU-IC, rechargeable capacitor, two drive units, and a pair of photosensors to enable it to independently propels itself toward a light source. Skilled technicians assemble "Monsieur" by hand from a total of ninety-eight parts, most of which are general purpose watch parts.

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Development of Low-Frequency Radio Controlled Watch

Toshio UMEMOTO, Toshio HIRUTA, Tadashi YASUOKA, Kiyotaka IGARASHI, Aki ...

Article type: Article
1993 Volume 146 Pages 51-63
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_51

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A radio controlled watch, that receives time codes on long-wave standard frequency and sets the time automatically, has been developed. The radio controlled watch developed thistime is of a multi-station receiving type that receives some standard frequencies by a switching operation. The watch is of an analog display type being equipped with 4 motors. The multi-station receiving type radio controlled Watch of this kind is the first one in the world. This paper reports the following three major points, excluding the receiving circuit. (1) Multi-station receiving system This watch is designed to receive three standard frequencies from Japan, U.K., and Germany by switching channels. For station selection, a mechanical contact point selects a mode and switches the capacitance. (2) Antenna system built in case A new case structure has been developed to install a very small bar-antenna inside a case. The built-in antenna inside the case permits use of a metal band. (3) Discontinuity of hand position after battery change Before battery change, the content of hand position counter is stored in an IC to dispense with hand positioning operation after battery change.

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Receiving System of Low-Frequency Radio Controlled Watch

Tadashi YASUOKA, Kenji FUJITA, Fumio NAKAMURA

Article type: Article
1993 Volume 146 Pages 64-72
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_64

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Radio controlled watche that receives time codes on long-wave standard frequency and displays time with hands according to the received time data was developed and put on the market at the beginning of 1993. This is the first radio wave watch of a multi-station selection type in the world, which receives long-wave standard freqencies from Germany, England, and Japan by switching the mode. The installed four motors permit display of hours, minutes, seconds, 24hours, month, day, and summer time. Automatic reading of external time data made possible to realize a high accuracy watch that does not need adjustment. Furthermore, the watch is equipped with a hand position storage function which stores hand position before battery change to dispense with manual time setting after battery change. This paper gives outline of the receiving system of the radio wave watch and description on the super-heterodyne circuit adopted to realize multi station selection.

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[title in Japanese]

[in Japanese]

Article type: Article
1993 Volume 146 Pages 73-79
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_73

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[title in Japanese]

[in Japanese]

Article type: Article
1993 Volume 146 Pages 80-83
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_80

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[title in Japanese]

[in Japanese]

Article type: Article
1993 Volume 146 Pages 84-87
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_84

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[title in Japanese]

Article type: Appendix
1993 Volume 146 Pages 91-
Published: September 25, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.146.0_91_2

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