| Project/Area Number |
07555632
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 試験 |
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| Research Field |
設計工学・機械要素・トライボロジー
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| Research Institution | SCIENCE UNIVERSITY OF TOKYO |
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Principal Investigator |
YOSHIMOTO Shigeka FACULTY OF ENGINEERING,SCIENCE UNIVERSITY OF TOKYO,PROFESSOR, 工学部・機械工学科, 教授 (80096718)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Akiyoshi COPAL ELECTRONICS CO.LEADER, スキャナ事業所研究班第一グループ, リーダー
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | HYDRODYNAMIC BEARING / GAS BEARING / VISCOUS VACUUM PUMP / HERRING-BONE GROOVE / PUMPING CHARACTERISTICS / WINDAGE POWER LOSS / LASER SCANNER |
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| Research Abstract |
Recently, rotational speed of a laser scanner motor has been rapidly increasing. But an increase in the rotational speed induces large windage power loss of a polygon mirror. This causes various problems such as considerable temperature rise of a housing and large power consumption of a scanner motor.
In this research, we proposed a newly developed reduction method of wihdage power loss of a laser scanner mirror. This method uses the pumping effect of a herring-bone gas journal bearing. This bearing can function as a viscous vacuum pump and pump the air out from the inside of the scanner housing. Since the pressure in the housing reduces to almost a vacuum, the windage power loss becomes to be nearly zero in this scanner. We manufactured this type of laser scanner motor with a vacuum pump. Then, we measured various performances of this laser scanner motor such as the windage power loss, the inner pressure of the housing, the pumping effect of the herring-bone journal bearint, the noise level and the fluctuation of motor rotational speed (jitters). Furthermore, bearing characteristics of herring-bone bearing with a vacuum pump were investigated. It was clearly seen that the power loss of the proposed scanner was about a half of that of the conventional one at 30000rpm and the jitters of the developed scanner motor was superior to the conventional scanner motor. As a result, it can be concluded that the proposed method is very effective for reducing the windage power loss of a laser scanner mirror.
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