Patent ID: 7538471

Claim:
A microactuator comprising: a base; a first comb electrode supported by the base; a movable section having a second comb electrode opposing the first comb electrode, and at least one reinforcement rib protruding toward the base and extending along at least three directions in a plane of the movable section; and an elastic supporting member for supporting the movable section so as to allow the movable section to be displaced with respect to the base, wherein the first comb electrode includes a plurality of comb teeth and the second comb electrode includes a plurality of comb teeth; the height of the at least one reinforcement rib is greater than the height of the plurality of comb teeth of the second comb electrode; and a groove in the first comb electrode that opposes the reinforcement rib has a bottom which is lower than a foot of at least one of the comb teeth of the first comb electrode.