Patent ID: 8456724

Claim:
A biaxial scanning mirror for an image forming apparatus, comprising: a first wafer, comprising: a mirror unit, rotating with respect to a first axis, for reflecting light beams; a rectangular rotating unit, formed around the mirror unit and connected to the mirror unit by a first shaft along the first axis, for rotating the mirror unit around a second axis which is perpendicular to the first axis, wherein the rotating unit includes first and second elongated planar sections extending perpendicular to the second axis and third and fourth elongated planar sections extending parallel to the second axis, the first through fourth elongated planar sections surrounding the mirror unit; a permanent magnet fixedly attached to each of the first and second elongated planar sections near a center thereof; and a magnetically permeable layer formed on each of the first and second elongated planar sections of the rotating unit for extending magnetic field generated by the permanent magnet from the center of the first and second elongated planer sections to both ends thereof; a second wafer having a plurality of cores, including at least two cores placed below two ends of the first elongated planar section of the rotating unit and at least two cores placed below two ends of the second elongated planar section of the rotating unit, each core being surrounded by a planar coil for receiving an AC current for switching magnetic polarization of the core, such that the cores are attracted to or repelled from the rotating unit alternatively, thereby driving the rotating unit to rotate with respect to the second axis; and a spacer, formed between the second wafer and the first wafer, for separating the second wafer and the first wafer.