Patents by Inventor Mark Weitzner
Mark Weitzner has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230111084Abstract: Methods and devices for driving a laser diode are disclosed herein. An example method includes a boost regulator outputting a maximum boost voltage to drive a laser diode that is configured to output light within a wavelength range of 495 nanometers (nm) to 570 nm. A boost servo may measure a laser voltage, and calculate a voltage difference between the two voltages. The servo may then compare the voltage difference to a drive voltage to determine an excess voltage, and may cause the boost regulator to output an optimum voltage based on the excess voltage. The boost servo may also calculate a low voltage to drive at least one additional component that is electrically coupled to the boost regulator when the laser diode is inactive; and may cause the boost regulator to output the low voltage to power the at least one additional component.Type: ApplicationFiled: October 12, 2021Publication date: April 13, 2023Inventors: Matthew D. Blasczak, James R. Giebel, Mark Weitzner, Gary G. Schneider
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Patent number: 8925814Abstract: A target is read in the presence of interference light. A photodetector generates an output signal composed of an information signal and an interference light signal. A rangefinder determines the distance of the target in a range of working distances. A controller adjusts a scan angle of a scan drive to a narrow value and adjusts an output power of a laser diode to a low power level when the target is determined to be far out in the range. The controller adjusts the scan angle to a wide value and adjusts the output power to a high power level when the target is determined to be close in the range. Signal processing circuitry processes the output signal with the information signal having a greater magnitude than that of the interference signal due to the high power level to mitigate the presence of the interference light. A power safety arrangement including dual power monitors checks the output power of the laser beam.Type: GrantFiled: October 9, 2013Date of Patent: January 6, 2015Assignee: Symbol Technologies, Inc.Inventors: Gary G Schneider, Peter Fazekas, James R Giebel, Mark A Weitzner
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Patent number: 8733659Abstract: In an electro-optical reader, an aiming or a scanning laser has a laser chip and a monitor photodiode. Output power of a laser beam emitted by the laser is regulated by a feedback circuit for maintaining substantially constant the laser beam output power during normal operation, a disabling circuit for disabling the feedback circuit, a drive circuit for driving the chip with a drive current when the feedback circuit is disabled, and for concomitantly generating a photodiode output voltage, a current modification circuit for modifying the drive current by a predetermined current with a concomitant change in the photodiode output voltage when the feedback circuit is disabled, and a control circuit for monitoring the change in the photodiode output voltage, for determining whether the change in the photodiode output voltage is sufficient to indicate an over-power condition, and for interrupting power to the chip when the over-power condition is indicated.Type: GrantFiled: August 27, 2010Date of Patent: May 27, 2014Assignee: Symbol Technologies, Inc.Inventors: James Giebel, Matthew Blasczak, Peter Fazekas, Mark Weitzner
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Patent number: 8167208Abstract: In an electro-optical reader, an aiming or a scanning laser has an internal laser chip and a monitor photodiode. A controller deenergizes the chip in a deenergized state, and energizes the chip to emit a laser beam with an output power in an energized state. A positive voltage power supply forward biases and maintains the photodiode at a substantially constant positive voltage below a threshold voltage, to support a substantially constant photodiode leakage current in both states. A signal processor supports a total current comprised of a main photodiode current indicative of the output power of the laser beam in the energized state and of the leakage current which flows opposite to the main current, and removes the leakage current from the total current to output only the main current in the energized state.Type: GrantFiled: June 23, 2010Date of Patent: May 1, 2012Assignee: Symbol Technologies, Inc.Inventors: Mark Weitzner, James Giebel
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Publication number: 20120048942Abstract: In an electro-optical reader, an aiming or a scanning laser has a laser chip and a monitor photodiode. Output power of a laser beam emitted by the laser is regulated by a feedback circuit for maintaining substantially constant the laser beam output power during normal operation, a disabling circuit for disabling the feedback circuit, a drive circuit for driving the chip with a drive current when the feedback circuit is disabled, and for concomitantly generating a photodiode output voltage, a current modification circuit for modifying the drive current by a predetermined current with a concomitant change in the photodiode output voltage when the feedback circuit is disabled, and a control circuit for monitoring the change in the photodiode output voltage, for determining whether the change in the photodiode output voltage is sufficient to indicate an over-power condition, and for interrupting power to the chip when the over-power condition is indicated.Type: ApplicationFiled: August 27, 2010Publication date: March 1, 2012Applicant: Symbol Technologies, Inc.Inventors: James GIEBEL, Matthew BLASCZAK, Peter FAZEKAS, Mark WEITZNER
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Publication number: 20110315771Abstract: In an electro-optical reader, an aiming or a scanning laser has an internal laser chip and a monitor photodiode. A controller deenergizes the chip in a deenergized state, and energizes the chip to emit a laser beam with an output power in an energized state. A positive voltage power supply forward biases and maintains the photodiode at a substantially constant positive voltage below a threshold voltage, to support a substantially constant photodiode leakage current in both states. A signal processor supports a total current comprised of a main photodiode current indicative of the output power of the laser beam in the energized state and of the leakage current which flows opposite to the main current, and removes the leakage current from the total current to output only the main current in the energized state.Type: ApplicationFiled: June 23, 2010Publication date: December 29, 2011Applicant: SYMBOL TECHNOLOGIES, INC.Inventors: Mark WEITZNER, James GIEBEL
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Publication number: 20100074286Abstract: Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.Type: ApplicationFiled: September 17, 2009Publication date: March 25, 2010Inventors: Costanzo Difazio, Vladimir Gurevich, James Giebel, Gary G. Schneider, Matthew Blasczak, Mark A. Weitzner, Edward Barkan
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Patent number: 7609736Abstract: Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.Type: GrantFiled: September 30, 2005Date of Patent: October 27, 2009Assignee: Symbol Technologies, Inc.Inventors: Costanzo Difazio, Vladimir Gurevich, James Giebel, Gary G. Schneider, Matthew Blasczak, Mark A. Weitzner, Edward Barkan
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Publication number: 20080308639Abstract: A bar code scanning device, system and method that utilizes one or more vertical cavity surface emitting laser diodes for producing at least one laser beam, where the vertical cavity surface emitting laser diodes are disposed on a substrate, and wherein the produced laser beam is substantially an essential single spatial mode laser beam. The bar code scanning device, system and method of present invention also comprise a photodiode attached to the substrate and arranged to receive at least a portion of the beam of light reflected off the scanned bar code or symbol.Type: ApplicationFiled: August 7, 2008Publication date: December 18, 2008Inventors: Miklos Stern, Chinh Tan, Yajun Li, Howard Shepard, Thomas Mazz, Eric Barkan, Vikram Bhargava, Andrew Fusco, Mark Weitzner
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Patent number: 7428995Abstract: A bar code scanning device, system and method that utilizes one or more vertical cavity surface emitting laser diodes for producing at least one laser beam, where the vertical cavity surface emitting laser diodes are disposed on a substrate, and wherein the produced laser beam is substantially an essential single spatial mode laser beam. The bar code scanning device, system and method of present invention also comprise a photodiode attached to the substrate and arranged to receive at least a portion of the beam of light reflected off the scanned bar code or symbol.Type: GrantFiled: February 5, 2001Date of Patent: September 30, 2008Assignee: Symbol Technologies, Inc.Inventors: Miklos Stern, Chinh Tan, Yajun Li, Howard Shepard, Thomas Mazz, Eric Barkan, Vikram Bhargava, Andrew Fusco, Mark Weitzner
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Patent number: 7296743Abstract: Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of operating conditions not conforming to preestablished standards, and adjust power to the laser to enhance reader performance without violating prevalent safety standards.Type: GrantFiled: July 23, 2004Date of Patent: November 20, 2007Assignee: Symbol Technologies, Inc.Inventors: James Giebel, Gary G. Schneider, Vladimir Gurevich, Mark A. Weitzner, Costanzo Difazio, Matthew Blasczak, Mark Anderson, Edward Barkan
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Publication number: 20070133633Abstract: Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of an over-power condition not conforming to preestablished regulatory standards. In one embodiment, during an operational mode, a difference between laser drive currents at two operating points is compared to a difference between laser drive currents at the same two operating points during a calibration mode. The over-power condition is recognized when the difference during the operational mode exceeds the difference during the calibration mode by a predetermined amount. In another embodiment, the laser is only energized to emit the beam at a reduced power level well below regulatory standards for staring at even if a motor drive failed.Type: ApplicationFiled: September 30, 2005Publication date: June 14, 2007Inventors: Costanzo Difazio, Vladimir Gurevich, James Giebel, Gary Schneider, Matthew Blasczak, Mark Weitzner, Edward Barkan
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Patent number: 7126734Abstract: Crosstalk between a drive coil and a feedback coil is eliminated by a motor drive circuit operative for generating the drive coil as a square wave, and by removing the crosstalk which occurs at zero transitions of a feedback signal. The drive coil is used to oscillate a scan mirror employed in an image projection arrangement or an electro-optical reader.Type: GrantFiled: October 19, 2005Date of Patent: October 24, 2006Assignee: Symbol Technologies, Inc.Inventors: James Giebel, Costanzo Difazio, Mark A. Weitzner
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Publication number: 20060016891Abstract: Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of operating conditions not conforming to preestablished standards, and adjust power to the laser to enhance reader performance without violating prevalent safety standards.Type: ApplicationFiled: July 23, 2004Publication date: January 26, 2006Inventors: James Giebel, Gary Schneider, Vladimir Gurevich, Mark Weitzner, Costanzo Difazio, Matthew Blasczak, Mark Anderson, Edward Barkan
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Patent number: 4856901Abstract: A piezoelectric activated dither suspension system for a ring laser gyroscope has all of the transducer elements connected in parallel to simultaneously produce sustaining torque for dither motion and respond to a back component of current produced by the vibrational motion of the gyro block. The generated current, separated from drive currents from the torquer amplifier by a transformer or, in an alternative embodiment, by sensing resistors, produces the very signal used to control and sustain the oscillations. By utilizing all transducers both as torquer and pickoff elements, economies of drive efficiency, wiring simplification and circuit redundancies are achieved.Type: GrantFiled: May 4, 1988Date of Patent: August 15, 1989Assignee: Kearfott Guidance & Navigation CorporationInventors: Lincoln S. Ferriss, Mark A. Weitzner
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Patent number: 4781462Abstract: Electro-optical apparatus for the control of the optical path length in a laser angular rate sensor. An output of a fringe detector dual photodiode and preamplifier, normally present, is processed to recover a laser intensity component present as an amplitude modulation superimposed on the phase-modulated fringe detector signal. The laser intensity component is then provided as an input to the optical path length feedback control system.Type: GrantFiled: February 9, 1987Date of Patent: November 1, 1988Assignee: The Singer CompanyInventors: Lincoln S. Ferriss, Mark A. Weitzner