Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1989 Volume 129 Pages Cover1-
Published: June 20, 1989
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.129.0_Cover1

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[title in Japanese]

Article type: Cover
1989 Volume 129 Pages Cover2-
Published: June 20, 1989
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.129.0_Cover2

JOURNAL FREE ACCESS

Download PDF (26K)
Submicron Size Measurement Using Laser

Hiroo FUJITA

Article type: Article
1989 Volume 129 Pages 1-14
Published: June 20, 1989
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.129.0_1

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A system for measuring submicron size less than 1 μm has been developed by Citizen Watch Co., Ltd. Laser beam is split into two beams by an acousto-optical device. The two beams are forcused into a microspot diameter and scanned on the sample. Then, from the patterns of intensity and the extreme intensity of the detected beam reflected from the sample, fine measurement can be obtained. By splitting the beam into two beams, the light intensity distribution of the microspot focused laser beam can be freely adjusted and set to a probing beam whose measuring sensitivity is higher depending on the object to be measured. The size up to 0.3 μm is able to be measured with a good linearity and repetitive stability of ±0.01 μm. This system is practical for full automatic on-line measurements on production lines.

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A Vibration Analysis of a New Shape Face Shear Mode Quartz Crystal Resonator

Hirofumi KAWASHIMA, Masaru MATSUYAMA, Mitsuhiro NAKAZATO

Article type: Article
1989 Volume 129 Pages 15-33
Published: June 20, 1989
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.129.0_15

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This paper describes a vibration analysis of a new shape face shear mode quartz crystal resonator consisting of a vibrational portion and two supporting portions. An object of this paper is to propose a new shape face shear mode quartz crystal resonator and to clarify its frequency characteristics, frequency temperature behavior, and electrical characteristics. In analysis procedure, first, equations of motion for the resonator consisting of the vibrational portion and the two supporting portions are derived from an energy method. The obtained partial differential equations are solved by using Galerkin's method and displacements obtained from the experiments of motional inductance L_1, and the frequency equation is calculated. Second, resonant frequency, frequency temperature characteristics, and electrical various characteristics are analyzed by utilizing the frequency equation and/or the displacements. Finally, these calculated results are compared with the experimental values. As a result, it is shown that the present resonator has a low series resistance and a high quality factor with zero temperature coefficients, even if the supporting portions are added and connected to the vibrational portion.

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Superplastic Forging Process Design of One-Piece Watch Dial

Minami KIMURA

Article type: Article
1989 Volume 129 Pages 34-54
Published: June 20, 1989
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.129.0_34

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In order to determine the manufacturing process of one-piece watch dial with indexes and feet, forging tests are carried out by using superplastic Zn-21.5% Al-0.5% Cu-0.01%Mg(SPZ). SPZ thin sheet in the thickness range of 0.3〜0.5 mm is cold-rolled after solution treatment. In superplastic forging under the punch speed of 1.7x10^<-3>〜1.7x10^<-1>mm・s^<-1>at 823K, the following kinds of method, (1) forging at constant punch speed and (2) forging at constant load followed by a constant punch speed are applied. As the experimental results, it can be conclude that the index formability and foot height is dependent on punch speed and holding time in both methods, and that method (2) shows the less dependence of grain-size and punch speed on formability compared with method (1). In a wide variety size of one-piece watch dial, simultaneous filling-up of indexes and feet is achieved by using the calculation diagram.

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Development of the Viscous-Sweep System

Shigeru AOKI, Osamu MIYAZAWA, Osamu TAKAHASHI

Article type: Article
1989 Volume 129 Pages 55-64
Published: June 20, 1989
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.129.0_55

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This paper describes a new quartz watch driving system we developed. With this system, the second hand of a wrist watch moves smoothly as if it is sweeping. An intermittent movement of the stepping motor is transferred to a smooth sweeping motion due to the spiral spring and the viscous regulator. This system also allows the continued superiority of quartz watches.

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Micromachining and Micromechanism

Masayoshi ESASHI

Article type: Article
1989 Volume 129 Pages 65-83
Published: June 20, 1989
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.129.0_65

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Micromachining developed with IC fabrication has been used to fabricate micro sensors and micro actuators. By virtue of the excellent electronic and mechanical properties of silicon single crystal, micromechanism which can integrate sensors and electronic circuit is available. Recent advances of micromachining and micromechanisms as integrated fluid control systems are described.

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