| 摘要 |
A pressure control apparatus according to the present invention is comprised of a magnetostrictive element section disposed between respective one ends of rotating rods which have the one ends thereof arranged on the same axis in a state connected to each other such that they are unrotatable relative to each other but at the same time are movable toward and away from each other, the rotating rods being rotatable about the axis in unison with each other, an urging means for urging the rotating rods to cause them to be closer to each other to thereby bring the respective one ends of the rotating rods into intimate contact with ends of the magnetostrictive element section, respectively, a magnetic field-applying means for generating a magnetic field for use in adjusting the length of the magnetostrictive element section to apply the magnetic field to the magnetostrictive element section, a pressure-detecting means for detecting pressure generated in the rotating rods in the direction of the axis, and a control section for controlling detected pressure such that it is constant, by controlling a strength of the magnetic field to adjust the length of the magnetostrictive element section.
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