IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
UP-0796230
(2007-04-26)
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등록번호 |
US-7679804
(2010-04-21)
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발명자
/ 주소 |
- Brown, Dean R.
- Davis, Wyatt O.
- Gibson, Gregory T.
- James, Richard A.
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
41 |
초록
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Briefly, in accordance with one or more embodiments, a MEMS device for a scanner system may be driven in a non-resonant mode of operation. The drive signal provided to the MEMS device may be tailored to prevent the MEMS device from exhibiting resonance characteristics and to cause the MEMS device to
Briefly, in accordance with one or more embodiments, a MEMS device for a scanner system may be driven in a non-resonant mode of operation. The drive signal provided to the MEMS device may be tailored to prevent the MEMS device from exhibiting resonance characteristics and to cause the MEMS device to operate non-resonantly. In one or more embodiments, a filter may be used to tailor the frequency components of the drive signal, for example to sufficiently attenuate frequency components at or near the resonant frequency of the drive signal. A direct current signal may be provided to the MEMS device to provide an offset to scanned light beam for example to provide beam steering, and the sweep range and/or sweep frequency may be adjusted for example to steer the scanning field of view off axis from the user pointing axis.
대표청구항
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What is claimed is: 1. An apparatus, comprising: a laser to emit a beam of light; a MEMS device having a mirror to reflect the beam of light emitted by the laser, the MEMS device having a resonant frequency associated therewith; a scan line generator circuit to provide a drive signal to the MEMS de
What is claimed is: 1. An apparatus, comprising: a laser to emit a beam of light; a MEMS device having a mirror to reflect the beam of light emitted by the laser, the MEMS device having a resonant frequency associated therewith; a scan line generator circuit to provide a drive signal to the MEMS device to move the mirror and direct the reflected beam of light in a motion responsive to the drive signal to scan a target; and a target imager circuit to receive a reflectance profile of the target in response to the scan to decode information represented by the target; wherein the drive signal provided to the MEMS device causes the MEMS device to operate in a non-resonant mode, and wherein the drive signal provided to the MEMS device, in response to an initial scan of a target, is capable of adapting to increase readability of the target, or to reduce a time to read the target, or combinations thereof, in a subsequent scan by driving the MEMS device in a non-resonant mode. 2. The apparatus as claimed in claim 1, wherein the drive signal is capable of adapting to reduce or minimize a time to startup the MEMS device, or to reduce or minimize a time to shut down the MEMS device, or combinations thereof. 3. The apparatus as claimed in claim 1, wherein the drive signal is capable of adapting to a known position of the MEMS device with respect to time to control gating of processing of incoming information about the target, or to control the laser to be active during predetermined periods of time during the scan, or combinations thereof. 4. The apparatus as claimed in claim 1, wherein the drive signal is capable of adapting to tailor a velocity of the scan across the target based at least in part on a location of the target within a field of view, to reduce or minimize velocity deviation of the scan from a constant value, to tailor the velocity of the scan across the target based at least in part on a module width of the target, or combinations thereof. 5. The apparatus as claimed in claim 1, wherein the drive signal is capable of adapting to vary a frequency at which the MEMS device is driven to increase or optimize readability of the target, or to reduce a time to read the target, or combinations thereof. 6. The apparatus as claimed in claim 1, wherein the drive signal is capable of adapting to vary a scan angle of the scan to increase or optimize readability of the target, or to reduce a time to read the target, or combinations thereof. 7. The apparatus as claimed in claim 1, wherein the drive signal is capable of adapting to direct the light beam in a spot at a desired location within a field of view, or to redirect the field of view to a location of the target to increase readability of the target, or to redirect the field of view to a location of the target to reduce a time to read the target, or combinations thereof. 8. The apparatus as claimed in claim 1, wherein the drive signal is capable of adapting to change a frequency of the drive signal, an amplitude of the drive signal, a shape of the drive signal, a phase of a drive signal, or a frequency component of the drive signal, or combinations thereof, to increase or optimize readability of the target, or to reduce a time to read the target, or combinations thereof. 9. The apparatus as claimed in claim 1, further comprising a filter to sufficiently attenuate components of the drive signal at the resonant frequency of the MEMS device, or near the resonant frequency of the MEMS device, or combinations thereof. 10. The apparatus as claimed in claim 1, further comprising a filter to sufficiently attenuate components of the drive at the resonant frequency of the MEMS device, or near the resonant frequency of the MEMS device, or combinations thereof, the filter comprising an analog filter, a digital filter, or combinations thereof. 11. The apparatus as claimed in claim 1, further comprising a filter to sufficiently attenuate components of the drive at the resonant frequency of the MEMS device, or near the resonant frequency of the MEMS device, or combinations thereof, the filter comprising a low pass filter, a high pass filter, a notch filter, or a band rejection filter, or combinations thereof. 12. The apparatus as claimed in claim 1, further comprising a filter to sufficiently attenuate components of the drive at the resonant frequency of the MEMS device, or near the resonant frequency of the MEMS device, or combinations thereof, the drive signal being generated at least in part from signal values stored in a memory, the filter being realized at least in part via pre-filtering of the values stored in the memory. 13. The apparatus as claimed in claim 1, the drive signal being capable of including a direct current offset to cause the mirror to be offset in a direction off axis from a user pointing axis. 14. The apparatus as claimed in claim 1, the drive signal provided to the MEMS device being capable of reducing or eliminating a resonant response of the MEMS device. 15. An information handling system, comprising: a processor; a memory coupled to said processor; and a MEMS module capable of being controlled by said processor by a program stored in the memory, said MEMS module comprising: a laser to emit a beam of light; a MEMS device having a mirror to reflect the beam of light emitted by the laser, the MEMS device having a resonant frequency associated therewith; a scan line generator circuit to provide a drive signal to the MEMS device to move the mirror and direct the reflected beam of light in a motion responsive to the drive signal to scan a target; and a target imager circuit to receive a reflectance profile of the target in response to the scan to decode information represented by the target; wherein the drive signal provided to the MEMS device causes the MEMS device to operate in a non-resonant mode, and wherein the drive signal provided to the MEMS device, in response to an initial scan of a target, is capable of adapting to increase readability of the target, or to reduce a time to read the target, or combinations thereof, in a subsequent scan by driving the MEMS device in a non-resonant mode. 16. The information handling system as claimed in claim 15, wherein the drive signal is capable of adapting to reduce or minimize a time to startup the MEMS device, or to reduce or minimize a time to shut down the MEMS device, or combinations thereof. 17. The information handling system as claimed in claim 15, wherein the drive signal is capable of adapting to a known position of the MEMS device with respect to time to control gating of processing of incoming information about the target, or to control the laser to be active during predetermined periods of time during the scan, or combinations thereof. 18. The information handling system as claimed in claim 15, wherein the drive signal is capable of adapting to tailor a velocity of the scan across the target based at least in part on a location of the target within a field of view, to reduce or minimize velocity deviation of the scan from a constant value, to tailor the velocity of the scan across the target based at least in part on a module width of the target, or combinations thereof. 19. The information handling system as claimed in claim 15, wherein the drive signal is capable of adapting to vary a frequency at which the MEMS device is driven to increase or optimize readability of the target, or to reduce a time to read the target, or combinations thereof. 20. The information handling system as claimed in claim 15, wherein the drive signal is capable of adapting to vary a scan angle of the scan to increase or optimize readability of the target, or to reduce a time to read the target, or combinations thereof. 21. The information handling system as claimed in claim 15, wherein the drive signal is capable of adapting to direct the light beam in a spot at a desired location within a field of view, or to redirect the field of view to a location of the target to increase readability of the target, or to redirect the field of view to a location of the target to reduce a time to read the target, or combinations thereof. 22. The information handling system as claimed in claim 15, wherein the drive signal is capable of adapting to change a frequency of the drive signal, an amplitude of the drive signal, a shape of the drive signal, a phase of a drive signal, or a frequency component of the drive signal, or combinations thereof, to increase or optimize readability of the target, or to reduce a time to read the target, or combinations thereof. 23. The information handling system as claimed in claim 15, further comprising a filter to sufficiently attenuate components of the drive at the resonant frequency of the MEMS device, or near the resonant frequency of the MEMS device, or combinations thereof. 24. The information handling system as claimed in claim 15, further comprising a filter to sufficiently attenuate components of the drive at the resonant frequency of the MEMS device, or near the resonant frequency of the MEMS device, or combinations thereof, the filter comprising an analog filter, a digital filter, or combinations thereof. 25. The information handling system as claimed in claim 15, further comprising a filter to sufficiently attenuate components of the drive at the resonant frequency of the MEMS device, or near the resonant frequency of the MEMS device, or combinations thereof, the filter comprising a low pass filter, a high pass filter, a notch filter, or a band rejection filter, or combinations thereof. 26. The information handling system as claimed in claim 15, further comprising a filter to sufficiently attenuate components of the drive at the resonant frequency of the MEMS device, or near the resonant frequency of the MEMS device, or combinations thereof, the drive signal being generated at least in part from signal values stored in a memory, the filter being realized at least in part via pre-filtering of the values stored in the memory. 27. The information handling system as claimed in claim 15, the drive signal being capable of including a direct current offset to cause the mirror to be offset in a direction off axis from a user pointing axis. 28. The information handling system as claimed in claim 15, the drive signal provided to the MEMS device being capable of reducing or eliminating a resonant response of the MEMS device.
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