| 摘要 |
PROBLEM TO BE SOLVED: To provide a polarizer of piezoelectric ceramic which can reduce the dispersion of capacitance. SOLUTION: A polarizer of ceramic, where many pieces of piezoelectric ceramics 11 are soaked in insulating oil 3, and DC high voltage is applied to polarize them, is provided with a agitation fan 4 for agitating the insulating oil 3, and is further provided with a means for moving up and down the piezoelectric ceramics 11 in the direction of an arrow 12 by a linear motor 9 through a fixing jig 5. |
