Electronic damping for stage positioning
View Patent ↗Systems and techniques for electro-magnetic damping in a stage system. An excitation waveform for one or more actuators includes one or more frequency components with associated amplitudes. Frequency components at a resonance frequency of the stage system have associated amplitudes that are substantially zero.
1. A method comprising:
receiving information indicative of a target position of a portion of a stage system included in a miniature camera, the target position being different than a current position of the portion of the stage system and included in a range extending from a minimum position to a maximum position, and wherein the stage system has at least one mechanical resonance frequency;
generating a waveform configured to move the portion to the target position, the waveform not including the at least one mechanical resonance frequency; and
wherein the information indicative of the target position is indicative of a desired zoom or focus of the miniature camera.
2. The method of claim 1 , further comprising transmitting the waveform to an actuator.
3. The method of claim 2 , further comprising moving the portion of the stage system to the target position using the actuator with substantially no oscillation of the portion of the stage system about the target position.
4. The method of claim 1 , wherein the information indicative of the target position is indicative of a desired zoom of the miniature camera.
5. The method of claim 1 , wherein the information indicative of the target position is indicative of a focus position of a lens included in the miniature camera.
6. The method of claim 1 , wherein generating the waveform comprises generating a waveform including one or more waveform segments each having an associated duration, and wherein the associated durations are selected so the one or more frequency components do not include the at least one mechanical resonance frequency.
7. The method of claim 1 , wherein generating the waveform comprises generating the waveform using a low pass filter.
8. The method of claim 1 , wherein generating the waveform comprises generating the waveform using finite impulse response (FIR) low pass filtering information.
9. The method of claim 8 , wherein generating the waveform using FIR low pass filtering information comprises generating a first waveform, performing one or more FIR low pass filtering calculations, and generating the waveform using the output of the one or more FIR low pass filtering calculations.
10. The method of claim 8 , wherein generating the waveform using FIR low pass filtering information comprises generating the waveform using a stored waveform based on an output of a FIR low pass filtering calculation and based on one or more scaling factors.
11. A miniature electronic device comprising:
a stage system having one or more resonant frequencies, the stage system comprising:
a positioner;
a controller configured to generate a waveform configured to move the positioner from a first position to a second position, the first position and the second position included in a range from a minimum position and a maximum position, wherein the waveform includes one or more frequency components with associated amplitudes, and wherein the associated amplitude of the one or more resonant frequencies is substantially zero;
wherein the device includes a miniature camera, and further comprising one or more optical elements on the positioner; and
wherein the one or more optical elements on the positioner comprise a lens and wherein the waveform is configured to move the lens relative to one or more fixed optical elements to implement at least one of zoom and autofocus.
12. The device of claim 11 , further comprising:
an actuator configured to receive the waveform and, in response, to move the positioner from the first position to the second position.
13. The device of claim 11 , wherein the waveform comprises one or more waveform segments, each having an associated segment duration, and wherein the associated segment durations are selected so that the associated amplitude of the one or more resonant frequencies is substantially zero.
14. The device of claim 11 , wherein the controller is configured to filter the one or more resonant frequencies so that the associated amplitude of the one or more resonant frequencies is substantially zero.
15. The device of claim 14 , wherein the controller includes a low pass filter.
16. The device of claim 14 , wherein the controller includes a finite impulse response (FIR) filter engine configured to generate the waveform using FIR information.
17. The device of claim 16 , wherein the controller includes a processor to generate the waveform using the FIR information.
18. The device of claim 16 , wherein the controller includes circuitry configured to store a waveform pulse shape using the FIR information, and further configured to generate the waveform using the waveform pulse shape.
19. The device of claim 18 , wherein the circuitry is configured to generate the waveform using the waveform pulse shape and one or more scaling factors.
20. An article comprising a machine-readable medium embodying information indicative of instructions that when performed by one or more machines result in operations comprising:
receiving information indicative of a target position of a portion of a stage system included in a miniature camera, the target position different than a current position of the portion of the stage system and included in a range extending from a minimum position to a maximum position, and wherein the stage system has at least one mechanical resonance frequency;
generating a waveform configured to move the portion of the miniature camera to the target position, the waveform including one or more frequency components, and wherein the one or more frequency components do not include the at least one mechanical resonance frequency; and
wherein the information indicative of the target position is indicative of a desired zoom of the miniature camera.
21. The article of claim 20 , further comprising transmitting the waveform to an actuator.
22. The article of claim 20 , further comprising moving the portion of the stage system to the target position using the actuator with substantially no oscillation of the portion of the stage system about the target position.
23. The article of claim 20 , wherein generating the waveform comprises generating a waveform including one or more waveform segments each having an associated duration, and wherein the associated durations are selected so the one or more frequency components do not include the at least one mechanical resonance frequency.
24. The article of claim 20 , wherein generating the waveform comprises generating the waveform using a low pass filter.
25. The article of claim 20 , wherein generating the waveform comprises generating the waveform using finite impulse response (FIR) low pass filtering information.
26. The article of claim 25 , wherein generating the waveform using FIR low pass filtering information comprises generating a first waveform, performing one or more FIR low pass filtering calculations, and generating the waveform using the output of the one or more FIR low pass filtering calculations.
27. The article of claim 25 , wherein generating the waveform using FIR low pass filtering information comprises generating the waveform using a stored waveform based on an output of a FIR low pass filtering calculation and based on one or more scaling factors.
28. A positioning system comprising:
a positioner configured to effect focus or zoom of a miniature camera;
an input configured to receive information indicative of a target position for the positioner;
memory storing information indicative of a waveform profile, wherein the waveform profile comprises one or more frequency components having associated amplitudes, and wherein a frequency component having a resonance frequency of the positioning system is substantially zero; and
circuitry to generate a positioning waveform using the information indicative of the target position and the waveform profile.
29. The positioning system of claim 28 , wherein the memory and the circuitry are included in an application-specific integrated circuit.
30. The positioning system of claim 28 , wherein the input comprises an inter-integrated circuit compatible interface.
31. The positioning system of claim 28 , wherein the information indicative of the target position comprises a scaling factor configured to move a portion of the positioning system from a current position to the target position.
32. A method comprising:
generating a waveform;
using the waveform to move a positioner of a miniature camera so as to effect a desired zoom or focus of the miniature camera; and
wherein the waveform lacks at least one resonant frequency of the positioner.
33. The method as recited in claim 32 , wherein the positioner comprises an optical component for use in focussing the miniature camera.
34. The method as recited in claim 32 , wherein the positioner comprises an optical component for use in zooming the miniature camera.