BIAXIAL SCANNING MIRROR FOR IMAGE FORMING APPARATUS
First Claim
Patent Images
1. 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, for rotating the mirror unit around a second axis which is perpendicular to the first axis, wherein the rotating unit has two vertical sides perpendicular to the second axis and two parallel sides parallel to the second axis;
a permanent magnet fixed at center of each of the two vertical sides; and
a magnetically permeable layer formed below each of the two vertical sides of the rotating unit for extending magnetic field generated by the permanent magnet from the center of the rotating unit to both ends of the vertical sides;
a second wafer having at least two cores, placed below both ends of the vertical sides of the rotating unit, each surrounded by a planar coil applied with an AC current for switching magnetic polarization of the cores 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.
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Abstract
A biaxial scanning mirror for an image forming apparatus is disclosed in the present invention. The mirror includes a first wafer, a second wafer, and a spacer. The first wafer includes a mirror unit, a rectangular rotating unit, a permanent magnet, and a magnetically permeable layer. The second wafer has at least two cores each surrounded by a planar coil applied with an AC current for switching magnetic polarization of the cores such that the cores are attracted to or repelled from the rotating unit alternatively, thereby driving the rotating unit to rotate.
18 Citations
12 Claims
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1. A biaxial scanning mirror for an image forming apparatus, comprising:
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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, for rotating the mirror unit around a second axis which is perpendicular to the first axis, wherein the rotating unit has two vertical sides perpendicular to the second axis and two parallel sides parallel to the second axis; a permanent magnet fixed at center of each of the two vertical sides; and a magnetically permeable layer formed below each of the two vertical sides of the rotating unit for extending magnetic field generated by the permanent magnet from the center of the rotating unit to both ends of the vertical sides; a second wafer having at least two cores, placed below both ends of the vertical sides of the rotating unit, each surrounded by a planar coil applied with an AC current for switching magnetic polarization of the cores 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification
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Current AssigneeGredman Taiwan Limited
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Original AssigneeTOUCH MICRO-SYSTEM TECHNOLOGY CORP. (Walsin Lihwa Corporation)
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InventorsLIN, Hung-Yi
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current359/200.7
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CPC Class CodesG02B 26/085 the reflecting means being ...G02B 26/101 with both horizontal and ve...
