Journal of the Horological Institute of Japan

[title in Japanese]

Article type: Cover
1993 Volume 145 Pages Cover1-
Published: June 20, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.145.0_Cover1

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[title in Japanese]

Article type: Cover
1993 Volume 145 Pages Cover2-
Published: June 20, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.145.0_Cover2

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Development of Running Microrobot

Makoto SUZUKI, Kou YAMAZAKI, Tatsunori INOUE

Article type: Article
1993 Volume 145 Pages 3-15
Published: June 20, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.145.0_3

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Investigation of micromachines and micromachining has started as a nationwide, large-scale R & D project. The research and development are now extensively carried out on an industrial, govermental and academic basis. Aiming at popularizing and promoting micromechanism technology, the micromechanism contest sponsored by the Japan Society of Precision Engineering is held annually. Seiko Instruments developed many types of running microrobots and participated in this contest. One of the microrobots incorporates the world's smallest ultrasonic micromotors developed by Seiko Instrunments, as the drive source. Its miniature size, high torque and quick response characteristics have resulted in very simple mechanism. This allowed us to gain the championship three times in succession. This development has showed not only the problems to be solved in developing micromechanism, but also the fact that an ultrasonic micromotor is effective as a power source for micromechanisms. With respect to speed and control characteristics, a wheel-type micromechanism with currently achieved size has been proved to be suitable for the running microrobot. In the present paper, development of microrobots composed of ultrasonic micromotors are reported mainly on the construction and the basic technology.

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Color of TiN Film by RF Ion Plating (II)

Yutaka NAKAMURA

Article type: Article
1993 Volume 145 Pages 16-28
Published: June 20, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.145.0_16

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Report of the last time was made on gas element influence of color of titaniumnitride films. This report shows an investigation of gas element in detail during deposition of titanium nitride films, and a study of adjustable color for titanium nitride films. Titanium nitride films were deposited by RF ion plating method. Change of gas element with time during deposition was measured by quadrupole mass spectrometer.Experimental items were change of pressure before deposition, undercoated film by titanium film and flowing oxygen gas during deposition of titanium nitride. Color of titanium nitride film deposited at higher pressure was rather dark,and undercoated film by titanium film was not changed in color as compered withnon-undercoted film. And color of titanium nitride film made by flowing a little oxygen gas was rather bright. I think that color of titanium nitride films can be adjusted from dark color tobright color by flowing oxygen gas under adequate condition.

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Resonant Frequency and Electrical Characteristics for Flexural Mode Quartz Crystal Resonators of Tuning Fork-Type with Stepped Vibration Bars

Hirofumi KAWASHIMA, Kenji SUNAGA

Article type: Article
1993 Volume 145 Pages 29-42
Published: June 20, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.145.0_29

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This paper describes the flexural mode quartz crystal resonators of tuning fork-type with stepped vibration bars.The object of this paper is to clarify resonant frequency and electrical characteristics for the resonators. A frequency equation and a transcendental equation are derived from the boundary condition of "clamped-free" and the continuation condition, respectively. From the equations, theoretical relationships of frequency constant and resonant frequency to a width ratio W_21 and a length ratio L_21 are shown. The results are then compared with the measured data. In addition, series resistance R_l and a quality factor versus resonant frequency are examined experimentally, as a result, the resonators of lower frequency sufficiently satisfactory as a resonator are found to be obtained without enlarging the resonators' size.

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Substitute Technology for CFC-113 in Clock Production

Keiichi YONEZAWA

Article type: Article
1993 Volume 145 Pages 43-55
Published: June 20, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.145.0_43

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Since around 1986, restriction on consumption of CFC (chloro fluoro carbon) has been continued in a global scale in order to protect ozone layer. Under such circumstances, we made a project to phase out the CFC consumption by December 1991. Till then, we had consumed CFC-113 for the cleaning of plastic and/or metallic parts, the elimination of refuse and/or oil on electronic parts, and the drying the surface of processed parts in clock production. First, we decided the order of priority for our phase-out project of CFC consumption as the following: (1)non-cleaning, (2) air cleaning, (3) aqueous cleaning and (4) organic solvent cleaning. We developed the substitute cleaning technology which we considered most suitable for each item, and then switched over the processing used so far to the renewed one.Some of the developed processing are, for example, air cleaning of plastic parts before paint application, and 2-stage drying of plated parts both by jet air and by hot air after cleaning by demineralized water. As the results of the development as above, we accomplished the phase-out of CFC consump-tion in November 1991. Among the new processing introduced for the phase-out project, 25% is non-cleaning and air cleaning, 21% is aqueous cleaning, 35% is organic solvent cleaning, and the rest of 19% is production control such as countermeasure for leakage.

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[title in Japanese]

[in Japanese]

Article type: Article
1993 Volume 145 Pages 56-70
Published: June 20, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.145.0_56

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[title in Japanese]

[in Japanese]

Article type: Article
1993 Volume 145 Pages 71-79
Published: June 20, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.145.0_71

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[title in Japanese]

[in Japanese]

Article type: Article
1993 Volume 145 Pages 80-85
Published: June 20, 1993
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/tokeieafj.145.0_80

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