| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vacuum control mechanism and a vacuum control method which is simple and inexpensive, moreover, can save an electric power and can control the vacuum in a vacuum chamber while protecting a vacuum pump. Ž<P>SOLUTION: The vacuum control mechanism for controlling the vacuum in the vacuum chamber 8 of performing lamination molding includes a controller 1 for controlling the vacuum in the vacuum chamber 8 by starting and stopping the vacuum pump 3 connected with the vacuum chamber 8 based on hysteresis H having a prescribed width value which is set in a detection value of a vacuum sensor 7 of measuring the vacuum in the vacuum chamber 8. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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