Mirror actuating device for projection systems
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United States of America Patent
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Sep 2, 2008
Grant Date -
Feb 21, 2008
app pub date -
Aug 13, 2007
filing date -
Aug 18, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A magnetic actuator utilizes a single magnet and two voice coils to rotate a mirror between two angular positions with respect to a rest state. A magnetic field assembly applies magnetic flux across the voice coils. An upper plate and a lower plate are held together by a permanent magnet, so that each plate forms a magnetic pole. The voice coils are actuated by feeding current to their coils, resulting in an electromagnetic field being formed around the coils. The voice coils have magnetic flux passing across them, caused by the magnet and the two plates. Hence, the coils move upward or downward according to the current applied. A mirror holder includes a fixed periphery and moving arms attached to a torsional beam spanning the periphery. The arms are moved by the adjacent voice coils, twisting the torsional beam, and the attached mirror moves also.
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