Micromirror actuator
First Claim
1. A micromirror actuator comprising:
- a substrate;
a trench in which at least one electrode is formed;
supporting posts installed at opposite sides of the trench;
a torsion bar supported by the supporting posts;
a micromirror including a driving unit which faces the trench when the micromirror is in a horizontal state, and a reflecting unit which is elastically rotated about the torsion bar to reflect an optical signal; and
a shielding electrode installed to face the reflecting unit when the micromirror is in the horizontal state and to block an electrostatic force occurring between the reflecting unit and the at least one electrode.
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Accused Products
Abstract
A micromirror actuator having a micromirror, which is operative using an electrostatic force with a low voltage and wherein an electrostatic force opposite to the driving force of the micromirror is blocked, and a method for manufacturing the same, are provided. The micromirror actuator includes a substrate, a trench in which at least one electrode is formed, supporting posts installed at opposite sides of the trench, a torsion bar supported by the supporting posts, and the micromirror including a driving unit which faces the trench when the micromirror is in a horizontal state, and a reflecting unit, which is elastically rotated about the torsion bar, to reflect an optical signal. The actuator also includes a shielding electrode installed to face the reflecting unit when the micromirror is in a horizontal state and to block an electrostatic force occurring between the reflecting unit and the electrode.
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Citations
17 Claims
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1. A micromirror actuator comprising:
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a substrate;
a trench in which at least one electrode is formed;
supporting posts installed at opposite sides of the trench;
a torsion bar supported by the supporting posts;
a micromirror including a driving unit which faces the trench when the micromirror is in a horizontal state, and a reflecting unit which is elastically rotated about the torsion bar to reflect an optical signal; and
a shielding electrode installed to face the reflecting unit when the micromirror is in the horizontal state and to block an electrostatic force occurring between the reflecting unit and the at least one electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of manufacturing a micromirror actuator, comprising:
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forming a trench pattern in a substrate;
forming a lower electrode and a side electrode in the trench pattern and forming a shielding electrode on a surface of the substrate outside the trench pattern by sequentially depositing an insulating layer and a metal layer on the substrate and etching the metal layer;
depositing a sacrificial layer to a predetermined thickness on the surface of the substrate including the trench pattern;
forming holes for supporting posts by etching a predetermined portion of the sacrificial layer;
depositing a further metal layer on the sacrificial layer and patterning the further metal layer into a micromirror, a torsion bar, and supporting posts; and
forming the micromirror, the torsion bar, and the supporting posts by removing the sacrificial layer. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification