Patent ID: 8355218

Claim:
An adjusting mechanism configured to adjust a position of an optical element, comprising: a fixing portion; a holding member configured to hold the optical element, the holding member including an outer periphery portion configured to hold an outer periphery of the optical element, a plurality of engagement protrusions configured to be connected to the outer periphery portion and to protrude in a radially outward direction of the optical element, and a plurality of flexures configured to be connected to the engagement protrusions and the outer periphery portion; a plurality of clamping portions capable of fixing or releasing the engagement protrusions with respect to the fixing portion; and a driving section configured to drive the outer periphery portion of the holding member in a pivot direction about a clamping portion fixing an engagement protrusion, wherein a clamping portion at a center of a pivot is configured to release an engagement protrusion so as to restore a flexure to a state prior to being elastically deformed in a state where a clamping portion other than the clamping portion at the center of the pivot fixes an engagement protrusion, and wherein the clamping portion at the center of the pivot is configured to fix the engagement protrusion again in a state where the flexure is restored to the state prior to being elastically deformed.