Mirror micromechanical structure and related manufacturing process
First Claim
Patent Images
1. A mirror micromechanical structure, comprising:
- a supporting body made of semiconductor material and having a top surface including a cavity;
a mobile mass having a top surface coplanar with the top surface of the supporting body and suspended above the cavity in a configuration which permits oscillation of the mobile mass about an axis of rotation; and
a mirror element supported by the mobile mass in a condition of rest to reflect an incident light beam at a rest angle;
wherein the mirror element further causes the reflected incident light beam to travel over an angular range bisected by the rest angle in response to oscillation of the mobile mass; and
wherein the cavity is shaped in a direction perpendicular to the axis of rotation so that the supporting body does not block the reflected incident light beam over the angular range.
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Abstract
A mirror micromechanical structure has a mobile mass carrying a mirror element. The mass is drivable in rotation for reflecting an incident light beam with a desired angular range. The mobile mass is suspended above a cavity obtained in a supporting body. The cavity is shaped so that the supporting body does not hinder the reflected light beam within the desired angular range. In particular, the cavity extends as far as a first side edge wall of the supporting body of the mirror micromechanical structure. The cavity is open towards, and in communication with, the outside of the mirror micromechanical structure at the first side edge wall.
11 Citations
22 Claims
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1. A mirror micromechanical structure, comprising:
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a supporting body made of semiconductor material and having a top surface including a cavity; a mobile mass having a top surface coplanar with the top surface of the supporting body and suspended above the cavity in a configuration which permits oscillation of the mobile mass about an axis of rotation; and a mirror element supported by the mobile mass in a condition of rest to reflect an incident light beam at a rest angle; wherein the mirror element further causes the reflected incident light beam to travel over an angular range bisected by the rest angle in response to oscillation of the mobile mass; and wherein the cavity is shaped in a direction perpendicular to the axis of rotation so that the supporting body does not block the reflected incident light beam over the angular range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A mirror micromechanical structure, comprising:
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a supporting body made of semiconductor material and having a top surface including a cavity; a mobile mass having a top surface coplanar with the top surface of the supporting body and having two end portions which are opposing, each end portion including a recess extending into the end portion along a length and further including an elastic element having a first end connected to an anchorage at the supporting body and a second end connected to the mobile mass within the recess, the elastic element extending within and along the length of the recess, the elastic element configured to permit oscillation of the mobile mass about an axis of rotation with respect to the supporting body; and a mirror element positioned at a central portion of the mobile mass and configured to reflect an incident light beam over an angular range; wherein the cavity is shaped in a direction perpendicular to the axis of rotation so that the supporting body does not block the reflected incident light beam over the angular range. - View Dependent Claims (14, 15, 16)
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17. A method for fabricating a mirror micromechanical structure, the method comprising:
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providing a first wafer; selectively removing a through pattern on the first wafer to form a mobile mass, two end portions which are opposing, two anchorage ends, and two elastic elements each connecting one of the two end portions to one of the two anchorage ends such that the mobile mass is rotatable about the two anchorage ends in an axis of rotation defined by the two elastic elements; attaching a mirror element onto the mobile mass, wherein the mirror element is configured to reflect an incident light beam with an angular range; bonding a second wafer to a support wafer to form a silicon body; setting the two anchorage ends onto the silicon body; and carving an opening in the silicon body to avoid hindrance of a light beam reflected by the mirror element within the angular range. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification