| 摘要 |
PROBLEM TO BE SOLVED: To prolong a lifetime of a drive motor for driving a sensitivity calibrating switch mirror and remove electric noise. SOLUTION: A drive motor is converted from rotation in a fixed direction to a reciprocating operation of a switch mirror by use of a cam mechanism, and effects of prolonging a lifetime of the drive motor and decreasing a consumed power and of removing electric noises generated when rotating forward or backward the motor can be obtained.
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