Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1991 Volume 139 Pages Cover1-
Published: December 20, 1991
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.139.0_Cover1

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[title in Japanese]

Article type: Cover
1991 Volume 139 Pages Cover2-
Published: December 20, 1991
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.139.0_Cover2

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Vibration Analysis of New Shape Length Extensional Mode Quartz Crystal Resonator with Barbell Type Vibration Bar

Hirofumi KAWASHIMA, Mitsuhiro NAKAZATO

Article type: Article
1991 Volume 139 Pages 1-14
Published: December 20, 1991
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.139.0_1

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An object of this paper is to propose a new shape length extensional mode quartz crystal resonator with barbell type vibration bar and to clarify its resonant frequency, frequency temperature behavior and electrical characteristics, taking account of lateral motions. In analysis procedure, equation of motion for the new shape resonator consisting of a vibrational portion and two supporting portions is derived from an energy method. From the obtained equation of motion, a frequency equation is calculated. Frequency characteristics, frequency temperature behavior and electrical characteristics are analyzed. These results are then compared with the measured data.

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Internally Temperature Compensated Crystal Oscillators Employing a New Shape GT Cut Quartz Crystal Resonator

Hirofumi KAWASHIMA, Kenji SUNAGA

Article type: Article
1991 Volume 139 Pages 15-27
Published: December 20, 1991
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.139.0_15

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This paper describes the self-temperature compensated crystal oscillator employing a new shape GT cut quartz crystal resonator. It is well-known that a new shape GT cut quartz crystal resonator manufactured by an etching process has excellent frequency temperature behavior more than the conventional GT plate manufactured by a mechanical process. However, as this GT resonator is a coupling resonator, its frequency temperature behavior varies with the circuit element such as load capacitance C_L, output resistance R_d or resistance R_<qs> connected in series to the resonator. The object of this paper is to clarify the relationship of oscillation frequency and frequency temperature coefficients versus R_d and R_<qs>. The noteworthy features are summarized as follows: (1) It is shown that the frequency temperature behavior slightly varies with R_d R_<qs>. (2) The present oscillator has the about one third value of the conventional TCXO current. (3) Hysteresis is negligibly small over a wide temperature range of -30℃〜+85℃.

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Development of Clocks with Luminescent Hands

Kouichi MIYAGI

Article type: Article
1991 Volume 139 Pages 28-37
Published: December 20, 1991
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.139.0_28

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We developed and put into the market clocks with luminescent hands by EL (electroluminescence) for the first time in the world. The EL especially developed for alarm clock is approximately 1.6 mm in width of luminescence. It is also for the first time that such a narrow width EL was developed. Several kinds of new technology were developed in parallel for the clocks with EL hands. The following three items are main points in this development: (1) Miniature rotary contact with high reliability was developed for the supply of electric power, (2) Inverter circuit driven by dry battery was developed for the excitation of EL, and (3) Factor of life span of miniature EL applied to clock hands was investigated and improved.

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Development of a New Type Multi-Functional Analogue Quartz Watch

Shigeyuki MASUDA, Chiaki NAKAMURA

Article type: Article
1991 Volume 139 Pages 38-46
Published: December 20, 1991
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.139.0_38

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This paper describes a new type multi-functional quartz analogue watch named Cal.6M. The Cal.6M has been developed along the idea that the three hands and the calendar are independently driven by respective motor. This permits a very easy and simple operation. The three hands put on the same axis and the calendar displayed by the date dial are driven forward and backward at high speed so that not only the hands play a role of realizing many functions, but also the calendar is automatically corrected at the end of month. The Cal.6M is provided with a crown for setting a mode and two push switches for controlling the hands and the calendar. Up to 7 modes are available. The selected mode appears on the display screen by the mode hand or by the mode plate under the dial, which links to the rotation of the crown. The Cal.6M is a microcomputer-controlled analogue watch, and therefore, a wide variety of functions ranging from sports to business is available only by changing the program stored in the microcomputer. The Cal.6M adopted coaxial three-hand and date dial system, therefore, the Cal.6M has cleared the limits in design, and also has realized a versatile design flexibility witch meets the users needs such as sports, business, and formal event.

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[title in Japanese]

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

Article type: Article
1991 Volume 139 Pages 47-68
Published: December 20, 1991
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.139.0_47

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[title in Japanese]

[in Japanese]

Article type: Article
1991 Volume 139 Pages 69-72
Published: December 20, 1991
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.139.0_69

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[title in Japanese]

[in Japanese]

Article type: Article
1991 Volume 139 Pages 73-75
Published: December 20, 1991
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.139.0_73

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