Electrical tuning of resonant scanning
First Claim
1. A scanning device, comprising:
- a frame, having a central opening;
an array comprising a plurality of parallel mirrors contained within the central opening of the frame;
hinges, which respectively connect the mirrors to the frame and define respective, mutually-parallel axes of rotation of the mirrors relative to the frame;
a main drive, which is configured to apply a driving force to the array so as to drive an oscillation of the mirrors about the hinges at a resonant frequency of the array;
a sensor, which is configured to detect a discrepancy in a synchronization of the oscillation among the mirrors in the array; and
an adjustment circuit, which is coupled to apply a corrective signal to at least one of the mirrors in order to alleviate the detected discrepancy,wherein the adjustment circuit comprises a first conductive comb attached to an edge of at least one of the mirrors and a second conductive comb attached to the frame so as to interleave with the first conductive comb, and the corrective signal is applied as an electrical potential difference between the first and second conductive combs.
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Accused Products
Abstract
A scanning device includes a frame, having a central opening, and an array including a plurality of parallel mirrors contained within the central opening of the frame. Hinges respectively connect the mirrors to the frame and define respective, mutually-parallel axes of rotation of the mirrors relative to the frame. A main drive applies a driving force to the array so as to drive an oscillation of the mirrors about the hinges at a resonant frequency of the array. A sensor is configured to detect a discrepancy in a synchronization of the oscillation among the mirrors in the array, and an adjustment circuit applies a corrective signal to at least one of the mirrors in order to alleviate the detected discrepancy.
13 Citations
18 Claims
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1. A scanning device, comprising:
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a frame, having a central opening; an array comprising a plurality of parallel mirrors contained within the central opening of the frame; hinges, which respectively connect the mirrors to the frame and define respective, mutually-parallel axes of rotation of the mirrors relative to the frame; a main drive, which is configured to apply a driving force to the array so as to drive an oscillation of the mirrors about the hinges at a resonant frequency of the array; a sensor, which is configured to detect a discrepancy in a synchronization of the oscillation among the mirrors in the array; and an adjustment circuit, which is coupled to apply a corrective signal to at least one of the mirrors in order to alleviate the detected discrepancy, wherein the adjustment circuit comprises a first conductive comb attached to an edge of at least one of the mirrors and a second conductive comb attached to the frame so as to interleave with the first conductive comb, and the corrective signal is applied as an electrical potential difference between the first and second conductive combs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10)
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9. A scanning device, comprising:
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a frame, having a central opening; an array comprising a plurality of parallel mirrors contained within the central opening of the frame; hinges, which respectively connect the mirrors to the frame and define respective, mutually-parallel axes of rotation of the mirrors relative to the frame; a main drive, which is configured to apply a driving force to the array so as to drive an oscillation of the mirrors about the hinges at a resonant frequency of the array; a sensor, which is configured to detect a discrepancy in a synchronization of the oscillation among the mirrors in the array; and an adjustment circuit, which is coupled to apply a corrective signal to at least one of the mirrors in order to alleviate the detected discrepancy, wherein the adjustment circuit comprises a heating trace formed in a vicinity of one or more of the hinges, and the corrective signal is applied as a current flowing through the heating trace so as to increase a temperature of at least one of the hinges.
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11. A method for producing a scanning device, the method comprising:
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etching a semiconductor wafer to define; a frame, having a central opening; an array comprising a plurality of parallel mirrors contained within the central opening of the frame; and hinges, which respectively connect the mirrors to the frame and define respective, mutually-parallel axes of rotation of the mirrors relative to the frame; coupling a main drive to apply a driving force to the array so as to drive an oscillation of the mirrors about the hinges at a resonant frequency of the array; coupling a sensor to detect a discrepancy in a synchronization of the oscillation among the mirrors in the array; and coupling an adjustment circuit to apply a corrective signal to at least one of the mirrors in order to alleviate the detected discrepancy, wherein coupling the adjustment circuit comprises attaching a first conductive comb to an edge of at least one of the mirrors and attaching a second conductive comb to the frame so as to interleave with the first conductive comb, and applying the corrective signal as an electrical potential difference between the first and second conductive combs. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification