High performance MEMS scanner
First Claim
Patent Images
1. A MEMS scanner;
- comprising;
a scan plate having longitudinal and lateral dimensions;
a first torsion arm coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the first torsion arm defining an axis of rotation of the scan plate;
a first leverage member coupled to the distal location of the first torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with the first torsion arm to two lateral locations, the lateral locations forming junctions with one or more mounting structures;
wherein the first torsion arm and the first leverage member each have about the same cross-sectional area and the first leverage member is configured to reduce stress in the torsion arm; and
wherein the scan plate is coupled to the first torsion arm via a scan plate mounting structure, the scan plate mounting structure comprising;
a suspension beam coupled to the first torsion arm at a location of the suspension beam generally coincident with the axis of rotation, and further coupled to the scan plate at one or more points not coincident with the axis of rotation; and
an axial connector coupling the suspension beam with the scan plate at a location generally coincident with the axis of rotation.
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Accused Products
Abstract
A high performance MEMS scanner is disclosed. In some embodiments, scanner mirror has a wide and short aspect ratio that is similar to rotating polygon facets. Long torsion arms allow large rotation angles including 20° zero-to-peak mechanical and greater. Suspensions couple the scan mirror to torsion arms, reducing dynamic mirror deformation by spreading the torque load. “leverage members” at the distal ends of the torsion arms help reduce stress concentrations. Elimination of a mounting frame increases device yield. Heater leads allow for precise trimming of the scanner resonant frequency. A compressive mount holds mounting pads against mounting structures.
83 Citations
63 Claims
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1. A MEMS scanner;
- comprising;
a scan plate having longitudinal and lateral dimensions; a first torsion arm coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the first torsion arm defining an axis of rotation of the scan plate; a first leverage member coupled to the distal location of the first torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with the first torsion arm to two lateral locations, the lateral locations forming junctions with one or more mounting structures; wherein the first torsion arm and the first leverage member each have about the same cross-sectional area and the first leverage member is configured to reduce stress in the torsion arm; and wherein the scan plate is coupled to the first torsion arm via a scan plate mounting structure, the scan plate mounting structure comprising; a suspension beam coupled to the first torsion arm at a location of the suspension beam generally coincident with the axis of rotation, and further coupled to the scan plate at one or more points not coincident with the axis of rotation; and an axial connector coupling the suspension beam with the scan plate at a location generally coincident with the axis of rotation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
- comprising;
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23. A MEMS scanner;
- comprising;
a scan plate having longitudinal and lateral dimensions; a first torsion arm coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the first torsion arm defining an axis of rotation of the scan plate; a first leverage member coupled to the distal location of the first torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with the first torsion arm to two lateral locations, the lateral locations forming junctions with one or more mounting structures; a second torsion arm, coaxial to the first torsion arm, coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the second torsion arm cooperating with the first torsion arm to form the axis of rotation of the scan plate; a second leverage member coupled to the distal location of the second torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with the second torsion arm to two lateral locations, the lateral locations forming functions with one or more mounting structures; mounting structures include first, second;
third, and fourth mounting pads, each mounting pad coupled to a lateral location of a respective leverage member;first, second, third, and fourth clamps, each clamp coupled to compressively hold a respective mounting pad against a respective support structure; and four support structures; wherein two of the support structures include respective piezoelectric stack actuators and two of the support structures include a substantially immoveable housing.
- comprising;
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24. A MEMS scanner;
- comprising;
a scan plate having a lateral dimension and a longitudinal dimension; first and second opposed torsion arms, each torsion arm coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the first and second torsion arms defining an axis of rotation of the scan plate; and first and second opposed mounting structures, each mounting structure coupled to a distal location of a respective torsion arm and including first and second opposed leverage members having respective cross sectional areas substantially similar to cross sectional areas of the first and second torsion arms and configured to reduce stress in the torsion arms, each leverage member coupled to a distal location of a respective torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with a respective torsion arm to two equidistant lateral locations, the equidistant lateral locations forming a junction with one or more mounting structures; and
wherein,each of the first and second torsion arms has a length greater than about four times the longitudinal dimension of the scan plate; wherein the scan plate is coupled to the first and second opposed torsion arms via a scan plate mounting structure for each of the first and second opposed torsion arms, the scan plate mounting structure comprising; a suspension beam coupled to a respective one of the first and second torsion arms at a location of the suspension beam generally coincident with the axis of rotation, and further coupled to the scan plate at one or more points not coincident with the axis of rotation; and an axial connector coupling the suspension beam with the scan plate at a location generally coincident with the axis of rotation. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
- comprising;
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36. A MEMS scanner;
- comprising;
a scan plate having a lateral dimension and a longitudinal dimension; first and second opposed torsion arms, each torsion arm coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the first and second torsion arms defining an axis of rotation of the scan plate; and first and second opposed mounting structures, each mounting structure coupled to a distal location of a respective torsion arm and including first and second opposed leverage members, each leverage member coupled to a distal location of a respective torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with a respective torsion arm to two equidistant lateral locations, the equidistant lateral locations forming a junction with one or more mounting pads, further including first, second, third, and fourth mounting pads, each mounting pad coupled to an equidistant lateral location of a respective leverage member; and first, second, third, and fourth clamps, each clamp coupled to compressively hold a respective mounting pad against a respective support structure;
whereintwo of the support structures include respective piezo-electric stack actuators and two of the support structures include a substantially immoveable housing; and wherein, each of the first and second torsion arms has a length greater than about four times the longitudinal dimension of the scan plate.
- comprising;
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37. A MEMS scanner;
- comprising;
a scan plate having a lateral dimension and a longitudinal dimension; first and second opposed torsion arms, each torsion arm coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the first and second torsion arms defining an axis of rotation of the scan plate; and first and second opposed mounting structures, each comprising a leverage member having a width similar to widths of the torsion arms and configured to reduce stress in the torsion arms, coupled to a distal location of the respective torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with the respective torsion arm to two equidistant lateral points; and first and second heater leads coupled to respective first and second opposed mounting structures, the heater leads being operable to pass current through the MEMS scanner to produce joule heating in the MEMS scanner; wherein the scan plate is coupled to the first and second opposed torsions arm via a scan plate mounting structure for each of the first and second opposed torsion arms, the scan plate mounting structure comprising; a suspension beam coupled to a respective one or the first and second opposed torsion arms at a location of the suspension beam generally coincident with the axis of rotation, and further coupled to the scan plate at one or more points not coincident with the axis of rotation; and an axial connector coupling the suspension beam with the scan plate at a location generally coincident with the axis of rotation. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
- comprising;
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51. A MEMS scanner;
- comprising;
a scan plate having a lateral dimension and a longitudinal dimension; first and second opposed torsion arms, each torsion arm coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the first and second torsion arms defining an axis of rotation of the scan plate; and first and second opposed mounting structures each mounting structure coupled to a distal location of a respective torsion arm; and first and second heater leads coupled to respective first and second opposed mounting structures, the heater leads being operable to pass current through the MEMS scanner to produce joule heating in the MEMS scanner; wherein the first and second mounting structures each include; a leverage member, coupled to the distal location of the respective torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with the respective torsion arm to two equidistant lateral points; and first and second mounting pads, each mounting pad coupled to the equidistant lateral point of a respective leverage member; and wherein the MEMS scanner further comprises; first, second, third, and fourth clamps, each clamp coupled to compressively hold a respective mounting pad, against a respective;
support structure;wherein two of the support structures include respective piezo-electric stack actuators and two of the support structures include a substantially immoveable housing.
- comprising;
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52. A MEMS scanner;
- comprising;
a scan plate having a lateral dimension and a longitudinal dimension; first and second opposed torsion arms, each torsion arm coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the first and second torsion arms defining an axis of rotation of the scan plate; and first and second opposed mounting structures, each mounting structure comprising a leverage member coupled to a distal location of a respective torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with the respective torsion arm to two equidistant lateral points, the leverage member having a cross-sectional area about the same as the torsion arm being configured to undergo bending deformation when the corresponding torsion arm undergoes torsional deformation; and at least two clamps, each clamp coupled to compressively hold a respective mounting structure against a respective support structure; wherein the scan plate is coupled to the first and second opposed torsion arms via a scan plate mounting structure for each of the first and second opposed torsion arms, the scan plate mounting structure comprising; a suspension beam coupled to a respective one of the first and second opposed torsion arms at a location of the suspension beam generally coincident with the axis of rotation, and further coupled to the scan plate at one or more points not coincident with the axis of rotation; and an axial connector coupling the suspension beam with the scan plate at a location generally coincident with the axis of rotation. - View Dependent Claims (53, 54, 55, 56, 57, 58)
- comprising;
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59. A MEMS scanner;
- comprising;
a scan plate having a lateral dimension and a longitudinal dimension; first and second opposed torsion arms, each torsion arm coupled to the scan plate and extending longitudinally from a proximal to a distal location therefrom, the first and second torsion arms defining an axis of rotation of the scan plate; first and second opposed mounting structures; and first, second, third, and fourth support structures; wherein each mounting structure comprises; a leverage member coupled to a distal location of a respective torsion arm and extending laterally therefrom in opposing directions from an axial location coincident with the respective torsion arm to two equidistant lateral points; first and second mounting pads, each mounting pad coupled to the equidistant lateral point of a respective leverage member; and first, second, third, and fourth clamps, each clamp coupled to compressively hold the respective mounting pad against the respective support structure; and wherein two of the support structures include respective piezo-electric stack actuators and two of the support structures include a substantially immoveable housing.
- comprising;
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60. A MEMS scanner;
- comprising;
a first mounting structure including a first leverage member;
a first torsion arm coupled to the first leverage member;a scan mirror coupled to the first torsion arm, the scan mirror being operable to rotate to and fro around a scan axis defined by the first torsion arm; a second torsion arm substantially coaxial with the first torsion arm coupled to the scan mirror; and a second mounting structure, separate from the first mounting structure, including a second leverage member coupled to the second torsion arm; wherein the first and second torsion arms and first and second leverage members are configured to undergo elastic deformation when the scan mirror rotates wherein the scan mirror is coupled to the first torsion arm and the second torsion arm via a scan mirror mounting structure for each of the first torsion arm and the second torsion arm, the scan mirror mounting structure comprising; a suspension beam coupled to a respective one of the first torsion arm and the second torsion arm at a location of the suspension beam generally coincident with the axis of rotation, and further coupled to the scan mirror at one or more points not coincident with the axis of rotation; and an axial connector coupling the suspension beam with the scan mirror at a location generally coincident with the axis of rotation. - View Dependent Claims (61, 62, 63)
- comprising;
Specification