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).

  • Publication number: 20230111084
    Abstract: 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: Application
    Filed: October 12, 2021
    Publication date: April 13, 2023
    Inventors: Matthew D. Blasczak, James R. Giebel, Mark Weitzner, Gary G. Schneider
  • Patent number: 8733659
    Abstract: 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: Grant
    Filed: August 27, 2010
    Date of Patent: May 27, 2014
    Assignee: Symbol Technologies, Inc.
    Inventors: James Giebel, Matthew Blasczak, Peter Fazekas, Mark Weitzner
  • Patent number: 8167208
    Abstract: 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: Grant
    Filed: June 23, 2010
    Date of Patent: May 1, 2012
    Assignee: Symbol Technologies, Inc.
    Inventors: Mark Weitzner, James Giebel
  • Publication number: 20120048942
    Abstract: 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: Application
    Filed: August 27, 2010
    Publication date: March 1, 2012
    Applicant: Symbol Technologies, Inc.
    Inventors: James GIEBEL, Matthew BLASCZAK, Peter FAZEKAS, Mark WEITZNER
  • Publication number: 20110315771
    Abstract: 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: Application
    Filed: June 23, 2010
    Publication date: December 29, 2011
    Applicant: SYMBOL TECHNOLOGIES, INC.
    Inventors: Mark WEITZNER, James GIEBEL
  • Publication number: 20080308639
    Abstract: 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: Application
    Filed: August 7, 2008
    Publication date: December 18, 2008
    Inventors: Miklos Stern, Chinh Tan, Yajun Li, Howard Shepard, Thomas Mazz, Eric Barkan, Vikram Bhargava, Andrew Fusco, Mark Weitzner
  • Patent number: 7428995
    Abstract: 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: Grant
    Filed: February 5, 2001
    Date of Patent: September 30, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Miklos Stern, Chinh Tan, Yajun Li, Howard Shepard, Thomas Mazz, Eric Barkan, Vikram Bhargava, Andrew Fusco, Mark Weitzner
  • Publication number: 20070133633
    Abstract: 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: Application
    Filed: September 30, 2005
    Publication date: June 14, 2007
    Inventors: Costanzo Difazio, Vladimir Gurevich, James Giebel, Gary Schneider, Matthew Blasczak, Mark Weitzner, Edward Barkan
  • Publication number: 20060016891
    Abstract: 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: Application
    Filed: July 23, 2004
    Publication date: January 26, 2006
    Inventors: James Giebel, Gary Schneider, Vladimir Gurevich, Mark Weitzner, Costanzo Difazio, Matthew Blasczak, Mark Anderson, Edward Barkan