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CN-122003582-A - Systems and methods for vibration reduction in encoder-based galvo

CN122003582ACN 122003582 ACN122003582 ACN 122003582ACN-122003582-A

Abstract

An encoder-based galvo system is adapted to reduce vibrations within the galvo by placing structural elements and vibration reducing damping material within the encoder. The disclosed systems and methods provide positioning error reduction and improved dynamic performance for encoder-based galvo systems.

Inventors

  • R. ALLEN
  • BOYD BROOKS
  • K. Sidore

Assignees

  • 诺万达公司

Dates

Publication Date
20260508
Application Date
20241017
Priority Date
20231017

Claims (20)

  1. 1. An encoder system for a galvo, the encoder system comprising: An emitter system comprising at least one emitter for providing light; A detector system comprising at least one detector for detecting light; an encoder disk coupled to a rotor of the galvo; A rigid structure positioned between the emitter system and the detector system such that the light can pass through the rigid structure, and A damping system comprising at least a polymeric material positioned in contact with either of the emitter system and the detector system.
  2. 2. The encoder system of claim 1, wherein the emitter system comprises an emitter printed circuit board, and the damping system comprises an elastomeric material on at least one side of the printed circuit board.
  3. 3. The encoder system of claim 2, wherein the emitter system comprises an emitter printed circuit board, and the damping system comprises a first material on a first side of the emitter printed circuit board and a second elastomeric material on a second side of the emitter printed circuit board opposite the first side of the printed circuit board.
  4. 4. An encoder system according to any of claims 1 to 3, wherein the detector system comprises a detector printed circuit board and the damping system comprises an elastomeric material on one side of the detector printed circuit board.
  5. 5. The encoder system of any of claims 1 to 4, wherein the damping system comprises an elastomeric material on a backside of the encoder disk.
  6. 6. The encoder system of any of claims 1 to 5, wherein the emitter system comprises an emitter printed circuit board, and the damping system comprises a first material on a first side of the emitter printed circuit board, a second elastomeric material on a second side of the emitter printed circuit board opposite the first side of the printed circuit board, and a third elastomeric material on a back side of the encoder disk.
  7. 7. The encoder system of claim 6, wherein first elastomeric material, the second elastomeric material, and the third elastomeric material each have a hardness between approximately 30 shore 00 hardness and 90 shore 00 hardness.
  8. 8. The encoder system of claim 6, wherein first elastomeric material, the second elastomeric material, and the third elastomeric material each have a thickness of at least about 2 mm.
  9. 9. The encoder system of claim 6, wherein at least one of the first elastomeric material, the second elastomeric material, and the third elastomeric material is sized to fit within a recessed region of a respective receiving surface.
  10. 10. The encoder system of claim 1, wherein the rigid structure is integrally formed as a unitary structure.
  11. 11. A galvo system, the galvo system comprising: a stator assembly; A rotor within the stator assembly, and An encoder system, comprising: An emitter system comprising at least one emitter for providing light; A detector system comprising at least one detector for detecting light; an encoder disk coupled to the rotor of the galvo, and A damping system comprising at least a polymeric material positioned in contact with either of the emitter system and the detector system.
  12. 12. The galvo system of claim 11, wherein the encoder system further comprises a rigid structure positioned between the emitter system and the detector system such that the light can pass through the rigid structure.
  13. 13. The galvo system according to any one of claims 11-12, wherein the emitter system comprises an emitter printed circuit board and the damping system comprises an elastomeric material on at least one side of the printed circuit board.
  14. 14. The galvo system of claim 13, wherein the emitter system comprises an emitter printed circuit board and the damping system comprises a first material on a first side of the emitter printed circuit board and a second elastomeric material on a second side of the emitter printed circuit board opposite the first side of the printed circuit board.
  15. 15. The galvo system of any one of claims 11 to 14, wherein the detector system comprises a detector printed circuit board and the damping system comprises an elastomeric material on one side of the detector printed circuit board.
  16. 16. The galvo system according to any one of claims 11 to 15, wherein the damping system comprises an elastomeric material on a backside of the encoder disk.
  17. 17. The galvo system of any one of claims 11-16, wherein the emitter system comprises an emitter printed circuit board, and the damping system comprises a first material on a first side of the emitter printed circuit board, a second elastomeric material on a second side of the emitter printed circuit board opposite the first side of the printed circuit board, and a third elastomeric material on a back side of the encoder disk.
  18. 18. The galvo system of claim 17, wherein first, second, and third elastomeric materials each have a hardness between about 30 shore 00 and 90 shore 00 hardness.
  19. 19. The galvo system of claim 17, wherein first elastomeric material, the second elastomeric material, and the third elastomeric material each have a thickness of at least about 2 mm.
  20. 20. The galvo system of claim 17, wherein at least one of the first elastomeric material, the second elastomeric material, and the third elastomeric material is sized to fit within a recessed region of a respective receiving surface.

Description

Systems and methods for vibration reduction in encoder-based galvo Priority The present application claims priority from U.S. provisional patent application No. 63/544,542 filed on 10/17 of 2023, which is incorporated herein by reference in its entirety for all purposes. Background The present invention relates generally to galvos, and more particularly to encoder-based galvos. There is an increasing demand for encoder-based galvo applications, in particular for via hole applications. In via hole applications, a Printed Circuit Board Assembly (PCBA) may have thousands of holes per workpiece. The effort for such laser drilling applications is typically in excess of 1000 holes per second. Thus, the time taken for each hole to reach within the target location, or settling time, has become an important measure for galvo performance. Therefore, the most advanced galvo must be able to quickly accelerate the mirror to the indicated position and settle within the specified accuracy before the laser can be fired to drill a hole. The settling time depends on many resonant frequencies of the mechanical system, which may cause the system to experience positioning errors outside of the desired time window in response to the indicated acceleration. While some prior art galvo systems may employ damping within the galvo to dampen vibrations, it is equally important not to negatively impact the stiffness required for rapid acceleration. Thus, there remains a need for a more efficient and economical encoder-based galvo system that provides improved settling time without negatively impacting other aspects of galvo system and encoder system performance, including, for example, rotor responsiveness, inertial constraints, and encoder accuracy. Disclosure of Invention According to one aspect, the present invention provides an encoder system for a galvo comprising an emitter system comprising at least one emitter for providing light, a detector system comprising at least one detector for detecting light, an encoder disk coupled with a rotor of the galvo, a rigid structure positioned between the emitter system and the detector system such that light can pass through the rigid structure, and a damping system comprising at least a polymeric material positioned in contact with either of the emitter system and the detector system. According to another aspect, the present invention provides a galvo system comprising a stator system, a rotor within the stator system, and an encoder system comprising an emitter system comprising at least one emitter for providing light, a detector system comprising at least one detector for detecting light, an encoder disk coupled with the rotor of the galvo, and a damping system comprising at least a polymeric material positioned in contact with either of the emitter system and the detector system. According to yet another aspect, the present invention provides a method of operating a galvo comprising the steps of causing a rotor to rotate within a stator, causing an encoder disk of an encoder system to rotate with the rotor, the encoder disk being coupled to the rotor and housed within the encoder system, the encoder system comprising an emitter system, a detector system and an encoder disk, and damping vibrations generated from within the encoder system using at least a polymeric material positioned in contact with any of the emitter system and the detector system. Drawings The following description may be further understood with reference to the accompanying drawings, in which: FIG. 1 shows an illustrative diagrammatic cross-sectional view of a system in accordance with an aspect of the invention; FIG. 2 shows an illustrative diagrammatic cross-sectional view of the system according to FIG. 1 in an operational configuration; FIG. 3 shows an illustrative diagrammatic isometric exploded view of the sub-assembly of the encoder of the present invention; FIG. 4 shows an illustrative diagrammatic isometric view of an aspect of the invention; FIG. 5 shows an illustrative diagrammatic isometric view of another aspect of the invention; FIGS. 6A and 6B show illustrative diagrammatic views of a mounting spacer according to one aspect of the present invention in isometric view (FIG. 6A) and top view (FIG. 6B); Fig. 7A and 7B show illustrative diagrammatic views of a mounting spacer according to another aspect of the present invention in isometric view (fig. 7A) and top view (fig. 7B); FIGS. 8A and 8B depict illustrative diagrammatic views of a galvo rotor subassembly in accordance with an aspect of the present invention in isometric views from above (FIG. 8A) and from below (FIG. 8B); FIG. 9 shows an illustrative diagrammatic partial exploded view of one aspect of the invention depicting an encoder subassembly with an encoder disk mounted to a rotor. The figures are shown for illustrative purposes only. Detailed Description According to various aspects, the present invention provides systems and methods for a mor