Patents by Inventor Anthony Ward Schrock

Anthony Ward Schrock 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).

  • Driver circuit for a camera autofocus laser diode with provision for fault protection
    Patent number: 5752100
    Abstract: A laser diode current drive control circuit including a drive circuit supplying a modulated laser diode current drive signal, a laser diode drive current source having a switch responsive to the drive circuit for controlling flow of drive current to the laser diode. The control circuit is further provided with one or more fault sensing circuits coupled to the diode current switch and responsive to a fault condition in the operation of the diode that would cause the diode power output to exceed a predetermined maximum safety limit to open the switch thereby terminating the flow of diode drive current. A feedback sensing circuit operating synchronously with the current drive signal is effective to open the switch when a normal feedback control signal is lost. A drive signal sensing circuit is effective to open the switch when integrated power output of the laser diode exceeds a safety related limit value.
    Type: Grant
    Filed: February 28, 1997
    Date of Patent: May 12, 1998
    Assignee: Eastman Kodak Company
    Inventor: Anthony Ward Schrock