| 摘要 |
PROBLEM TO BE SOLVED: To make positions of respective scanning surfaces coincide between forward scanning and backward scanning when mechanically scanning a vibrator unit. SOLUTION: Electronic scanning is started in one direction when the vibrator unit reaches a preset position in the forward scanning. An end position is stored in a memory in the electronic scanning in the respective one directions. The electronic scanning is started every time the vibrator unit reaches the end position stored in the memory in the backward scanning. Thus, since a starting position of the electronic scanning in the backward scanning can be adaptively set, the positional relationship of the scanning surfaces can be properly set between the forward scanning and the backward scanning.
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