| 摘要 |
PROBLEM TO BE SOLVED: To stably fit a mirror so that its reflection angle does not deviate due to vibration, etc. SOLUTION: If the mirror 16 tilts, a spring presses the mirror 16 with the depressing force S corresponding to the tilt angleθ. Here, when components of the depressing force S are considered to be a vertical component Sv and a parallel component Sh, the part in contact with a nonreflection surface never slides on condition that Sh<μSv=Fh (frictional resistance force of nonreflection surface), whereμis the coefficient of friction between the spring and the nonreflection surface of the mirror 16. Consequently, the mirror 16 never floats after being adjusted.
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