Actuator, optical scanner, and image forming apparatus

Details Actuator, optical scanner, and image forming apparatus Actuator, optical scanner, and image forming apparatus

2007-09-17

2008-08-05

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

By moving a reflective element

C359S198100, C359S199200, C310S036000

Reexamination Certificate

active

07408690

ABSTRACT:
An actuator includes a frame-shaped first mass portion; a supporting portion that supports the first mass portion and takes the shape of a frame so as to surround a perimeter of the first mass portion; a pair of first elastic portions coupling between the first mass portion and the supporting portion so that the first mass portion is supported by the supporting portion; a second mass portion provided inside the frame-shaped first mass portion; a pair of second elastic portions coupling between the second mass portion and the first mass portion so that the second mass portion is supported by the first mass portion; and a driver for rotating the first mass portion. The driver includes a ferromagnet provided on the first mass portion in a position separate from a rotation central axis of the first mass portion; a coil formed along the rotation central axis of the first mass portion and the supporting portion so as to surround and orbit a perimeter of the ferromagnet if the first mass portion is seen from above; and a voltage application unit for applying a voltage to the coil. An operation of the voltage application unit included in the driver causes the coil to generate a magnetic field. The generation of the magnetic field causes displacement of the ferromagnet relative to the coil. The displacement of the ferromagnet causes the first mass portion to rotate while torsionally deforming the pair of first elastic portions. The rotation of the first mass portion causes the second mass portion to rotate while torsionally deforming the pair of second elastic portions.

REFERENCES:
patent: 5543956 (1996-08-01), Nakagawa et al.
patent: 5969465 (1999-10-01), Neukermans et al.
patent: 06-175060 (1994-06-01), None

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