| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical scanner which includes: a vibration mirror having a mirror face reflecting a light beam; and a pair of torsion beams which support the vibration mirror in a freely oscillatable manner, and the scanner in which a variation in the resonance frequency of the vibration mirror is reduced and the absorption range of the variation in the driving frequency is broadened, and to provide an image forming apparatus using the optical scanner. SOLUTION: The optical scanner (1A) has structure in which the pressure in the oscillating spaces (4-1, 2-1) of the vibration mirror is adjusted while driving the oscillation mirror, and the oscillation spaces (4-1, 2-1) is sealed so that the characteristic of the vibration mirror (3-3) is controlled in the predetermined range. COPYRIGHT: (C)2006,JPO&NCIPI
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