| 摘要 |
An actuator includes a movable portion which can swing around a swing axis, a connecting portion which extends from the movable portion, and a support portion which supports the connecting portion, wherein the movable portion is formed in a cross shape which includes a pair of first protrusions protruding along a direction perpendicular to the swing axis and a pair of second protrusions protruding along a direction parallel to the swing axis, and when a length of the movable portion in the direction perpendicular to the swing axis is A, a length of the movable portion in the direction parallel to the swing axis is B, a length of the first protrusion in the direction perpendicular to the swing axis is a, and a length of the second protrusion in the direction parallel to the swing axis is b, the following equations (A) and (B) are satisfied. 0.8 × { 1 2  ( A - 1 3 A 2 + 1 B 2 ) } ≤ a ≤ 20 × { 1 2  ( A - 1 1 3  A 2 + 1 B 2 ) } ( A ) 0.8 × { 1 2  ( B - 1 1 3  A 2 + 1 B 2 ) } ≤ b ≤ 2.0 × { 1 2  ( B - 1 3 A 2 + 1 B 2 ) } ( B )
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