Patent ID: 8365597

Claim:
An apparatus having a movable body, the apparatus comprising: a first layer comprising a support portion; a second layer partially stacked on the first layer; and a third layer stacked on the first layer via the second layer, the third layer extending along an x-axis and a y-axis that are perpendicular to each other and perpendicular to a z-axis respectively, wherein the third layer comprises a fixed portion fixed to the support portion via the second layer, and a separate portion separated from the support portion, the separate portion comprises a plurality of first spring portions connected to the fixed portion, a first movable portion connected to the plurality of first spring portions, a second spring portion connected to the first movable portion, and a second movable portion connected to the second spring portion, the second movable portion comprises a rectangular frame having two sides extending along the x-axis and two sides extending along the y-axis, the first movable portion is enclosed within the rectangular frame, the plurality of first spring portions is distributed at least at four positions between the first movable portion and the second movable portion, the four positions are distributed at four symmetric positions about the x-axis and the y-axis that pass through a center of the first movable portion, a spring constant of each of the plurality of first spring portions in a z-axis direction is lower than spring constants of each of the plurality of first spring portions in an x-axis direction and a y-axis direction, respectively respectively, a spring constant of the second spring portion in the x-axis direction is lower than spring constants of the second spring portion in the y-axis direction and the z-axis direction, respectively, the first movable portion is configured, by the plurality of first spring portions, to move along the z-axis but not to move along the x-axis and the y-axis nor to rotate around the z-axis with respect to the support portion, and the second movable portion is configured, by the plurality of first spring portions and the second spring portion, to only move along the x-axis and the z-axis with respect to the support portion.