OPTICAL SCANNER, IMAGE FORMING APPARATUS INCLUDING THE OPTICAL SCANNER, AND METHOD OF ADJUSTING RESONANCE FREQUENCY OF VIBRATION MIRROR PART IN OPTICAL SCANNER

摘要

PROBLEM TO BE SOLVED: To improve the accuracy of adjustment of the resonance frequency of a vibration mirror part in a resonance type optical scanner.SOLUTION: On a surface 41b on the opposite side to a reflection surface 41a in a vibration mirror part 41, a groove part 70 is formed to be filled with a hardening resin 60, and the groove part 70 extends to intersect an oscillation shaft center A of the vibration mirror part 41 when viewed from the opposite side of the reflection surface 41a of the vibration mirror part 41.