Micromechatronics

Online ISSN : 2432-0358
Print ISSN : 1343-8565
ISSN-L : 1343-8565

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Volume 47, Issue 2

Displaying 1-15 of 15 articles from this issue

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[title in Japanese]

Article type: Cover
2003 Volume 47 Issue 2 Pages Cover1-
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_Cover1

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[title in Japanese]

Article type: Cover
2003 Volume 47 Issue 2 Pages Cover2-
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_Cover2

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A study on designs of wearable systems for car drivers' fatigue evaluation

IKUO Misumi, MASAYUKI Hasegawa, KEN Sasaki, HIROSHI Hosaka, [in Japane ...

Article type: Article
2003 Volume 47 Issue 2 Pages 1-10
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_1

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Fatigue and/or drowsiness m primary causes of serious trafic accidents, therefore evaluation of car drivers' condition and early warning, especially by automatic wearable systems, are highly important. In order to design such systems, identification of indicators of drivers' fatigue / drowsiness is necessary. We focused on bio-signals, and built a driving simulator with bio-signal evaluation equipment. From the results of experiment we found changes in frequency of eye movement (an increase in low frequency) are meaningful as an indicator.

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Vibration Reduction of a Rotary-type Head-positioning Mechanism Using a Reaction-force Isolated, Twin-drive mechanism

Takeshi YOSHIDA

Article type: Article
2003 Volume 47 Issue 2 Pages 11-22
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_11

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Reducing structural vibration is essential for achieving high-accuracy, high-speed head positioning for hard disk drives. A reaction-force isolated, twin-drive mechanism has been prototyped to suppress structural excitation due to reaction force and pivot shaft translational excitation. The mechanism consists of two parts: "a reaction-force isolation mechanism" in which the reaction force occurred from the actuator does not excite the base directly, and "a twin-drive mechanism" that rotates the carriage with two driving coils and excites the carriage mechanism much less than conventional ones. Using this mechanism, residual vibration becomes one-fourth that with the conventional actuator.

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Modal analysis of asymmetric trident type vibration gyro

Tohru YANAGISAWA, Izumi YAMAMOTO, Shin-ichi KOMINE, Akihiro SHIOJI

Article type: Article
2003 Volume 47 Issue 2 Pages 23-30
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_23

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By means of tuning the tine width of trident type tuning fork, we made the asymmetric trident type vibration gyro in which only two tines vibrate in the same plane while all tines vibrate in perpendicular to that plane. These vibration modes have holding characteristics as good as resonator for wristwatches. Our gyro sensor has stable behavior to temperature. And in the drive mode the detect tine which does not vibrate has less leak output. We got the shape of trident type tuning fork from FEM analysis.

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Discussion for touch-sensing device using leaky Sezawa-wave

Fumio KIMURA, Hideki KITAJIMA, Takashi SARATA, Masataka SHIN-OGI

Article type: Article
2003 Volume 47 Issue 2 Pages 31-37
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_31

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We have proposed a novel type of touch-sensing device using an ultrasonic transducer of leaky Sezawa-wave type that is a binary plate consisting of a transparent substrate and a niezoelectric thin plate on which an interdigital transducer is fabricated. Comparison with a conventional touch-sensing device of surface wave type shows a possibility that a small and power-saving sensing device will be realized.

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Collision of a Bar with a Beam (Details of Collision Mechanism and Principal Factor)

Tatsuo NARABAYASHI, Akio ISHIZAKA, Koichi OZAKI

Article type: Article
2003 Volume 47 Issue 2 Pages 38-49
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_38

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When a bar collides perpendicularly against center of a beam, intermittent type collision was occurs repeatedly until the half-cycle of the beam's deformation motion is accomplished. In this paper, the details of collision process and motion mechanism is shown precisely and the effect of principal key factor also be shown by analytical and experimental approach. The movement of a bar and a beam are shown analytically and the impact force pattern is shown experimentally. The results of experiment showed the tendency which agrees on two key factors of 1) mass ratio and 2) 1'st natural frequency ratio. If a value of each key factor was determined, collision pattern of intermittent also be settled, and these patterns appear as the phenomenon of similar figure along the time axis was clarified from this experiment.

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[title in Japanese]

[in Japanese]

Article type: Article
2003 Volume 47 Issue 2 Pages 50-56
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_50

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[title in Japanese]

[in Japanese]

Article type: Article
2003 Volume 47 Issue 2 Pages 57-60
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_57

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[title in Japanese]

[in Japanese]

Article type: Article
2003 Volume 47 Issue 2 Pages 61-65
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_61

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Structural Technology for Hard Disk Drives Part 3 : High-speed, High-precision Head Positioning Technology for Hard Disk Drives

Takeshi YOSHIDA

Article type: Article
2003 Volume 47 Issue 2 Pages 66-79
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_66

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[title in Japanese]

[in Japanese]

Article type: Article
2003 Volume 47 Issue 2 Pages 80-85
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_80

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[title in Japanese]

Article type: Appendix
2003 Volume 47 Issue 2 Pages 86-87
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_86

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[title in Japanese]

Article type: Appendix
2003 Volume 47 Issue 2 Pages 88-89
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_88

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[title in Japanese]

Article type: Appendix
2003 Volume 47 Issue 2 Pages 96-
Published: June 10, 2003
Released on J-STAGE: November 09, 2017

DOIhttps://doi.org/10.20805/micromechatronics.47.2_96_1

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