Patent ID: 7105902

Claim:
An optical device comprising: a semiconductor substrate having an opening; a support member disposed on the substrate; a movable portion disposed on the opening of the substrate; and a trench, wherein the movable portion is movably supported by the support member, wherein the substrate includes a silicon-on-insulator substrate having a first silicon layer, an embedded insulation film, and a second silicon layer so arranged in the recited order, wherein the opening of the substrate provides a through hole disposed in the substrate, wherein the support member is disposed on the embedded insulation film and is separated from the second silicon layer, wherein the trench connects to the through hole so that the movable portion is separated from the substrate by the trench and the through hole, wherein the support member is includes a pair of beams, wherein each beam is separated from the seconds silicon layer and the embedded insulation layer by the trench so that the beam is movably disposed on the embedded insulation layer, wherein the movable portion connects to the beams working as a supporting point of the movable portion, wherein the movable portion includes a mirror disposed thereon for reflecting a light, and wherein each beam includes a lower portion having a wedge shape contacting the embedded insulation film so that the beam can be move freely.