Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1988 Volume 124 Pages Cover1-
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_Cover1

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[title in Japanese]

Article type: Cover
1988 Volume 124 Pages Cover2-
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_Cover2

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Development of a Very Accurate and Electrically Frequency-Adjustable Quartz Oscillator

Osamu OCHIAI, Fujio TAMURA, Yoshitaka MASHIMO, Toshio TANIGUCHI

Article type: Article
1988 Volume 124 Pages 1-14
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_1

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A miniature quartz oscilltor with high frequency stability and low power dissipation for mobile telecommunication has been developed, using a miniaturized GT-cut quartz resonator (MGQ), a newly designed CMOS oscillator IC with a constant low voltage source and a floating MOS variable capacitor (PEAC) for frequency adjustment. At oscillation frequency of 2.1 MHz and supply voltage of 5 V, the quartz oscillator has frequency stability of ± 3 ppm over the temperature of -30 to +75 ℃, current consumption of 350 μA and shock resistance of 125 cm against random drop on a concrete floor. Almost all of the electrical components are integrated and they are contained in a HC-49U type metal case with the size of 13.2 x 10.9 x 4.5 mm. Other features of this quartz oscillator realized by employing the PEAC are very fine adjustability of the oscillation frequency, and complete hermeticity and immersed washability of the oscillator in the assembly line.

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An Analysis of Frequency Temperature Characteristics for a GT-Cut Quartz Crystal Resonator Formed by an Etching Method

Hirofumi KAWASHIMA

Article type: Article
1988 Volume 124 Pages 15-28
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_15

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This paper describes the frequency temperature characteristics of a GT-cut quartz crystal resonator with the supporting portions at both ends formed by an etching method. It was reported that the GT-cut quartz crystal resonator is excellent in frequency temperature characteristics as well as the conventional GT plate, and available for consumer products and communication equipment. In this paper, a further theoretical analysis concerning frequency temperature characteristics of the previously proposed GT-cut quartz crystal resonator, has been made. Consequently, first, relationships of a frequency constant vs. a mass ratio, frequency temperature coefficients vs. cut angles, a dimensional ratio, and a mass ratio are clarified. Finally, an example of frequency temperature characteristics is shown.

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Development of Speech-Recognition Watch

Katsuhiko KOMIYAMA, Masao SAKUYAMA, Kunikazu MOCHIDA, Koichi SATO

Article type: Article
1988 Volume 124 Pages 29-40
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_29

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As means for man-machine interface for watches, many methods have been considered and realized. Most of conventionally used means are push-buttons. However, as watches become multi-functioned, the input method more suitable for the function is required, We have developed and produced a multifunction watch which uses a speaker-dependent system and an isolated word-recognition system incorporating in speech-recognition LSI. The entire watch can be controlled by voice. In this article, this new watch is described.

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Isolation of Printer from Mechanical Vibration : Modeling for Finite Element Method

Katsumasa AMADA, Yasuo YOSHIMURA

Article type: Article
1988 Volume 124 Pages 41-49
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_41

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With rapid development of computers and the peripheral equipments, they are unavoidable to be used under severe circum-stances such as high temperature changes, electrical noises, mechanical vibrations and shocks. In view of the recent situation where airplanes and automobiles are widely equipped with such devices, the mechanical vibrations and shocks are, in particular, inevitable factors on the evaluation of the performance of such devices. One of typical output equipments supposed to be used in hard environments is a printer. This is apt to produce disordered characters in its figure and shade of color in severe circumstances. This paper aims to have a clue for optimum design of its anti-vibration structure, resulting in characters with high quality. For numerical analysis, a Finite Element Method (FEM) is applied. The condition of distribution of elements and the way of deciding constraints at nodes must affect the numerical results. So, the authors assumed several combined models to judge the adequateness of such modeling by comparing them with the experimental results. The condition under which the results obtained by FEM such as the natural frequencies, natural vibration modes and transmissibility coincide with the experimental ones is expressed as follows; The contact part of the lower and upper cases could be treated as connected rigidly as well as ribs which connect the both cases to strengthen the structures. It is also clarified in this paper that the analysis by FEM with considerably rough distribution of divided elements is enough for the comparison with the experimental results.

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Development of a Power Supply system for Solar Battery Watches

Yumi SAKAMOTO, Hitomi AIZAWA, Yoshito USHIYAMA

Article type: Article
1988 Volume 124 Pages 50-62
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_50

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We have developed a new power supply system for solar battery watches. The features are as follows : 1. Charging system is unnecessary, -No need for storage battery or back-up condenser, 2. Dual power supply, -Furnished with both solar battery and lithium battery, Lithium battery serves as back-up power source whenever illumination is such that solar battery alone is not sufficient, 3. Simple construction and high reliability.

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[title in Japanese]

[in Japanese]

Article type: Article
1988 Volume 124 Pages 63-79
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_63

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[title in Japanese]

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

Article type: Article
1988 Volume 124 Pages 80-98
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_80

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[title in Japanese]

[in Japanese]

Article type: Article
1988 Volume 124 Pages 99-102
Published: March 20, 1988
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.124.0_99

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