Patents by Inventor Hartmut Bielefeldt

Hartmut Bielefeldt 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).

  • Method for operating an optical proximity switch in accordance with the time-of-flight principle
    Patent number: 10145943
    Abstract: The invention relates to a method for operating an optical proximity switch, wherein an object distance E is determined by means of a time-of-flight method and a specified range is limited by an adjustable switching distance SAE. The switching output (6) is activated at an object distance E1<SAE and deactivated at an object distance E2>SAE+H(SAE), wherein a hysteresis H (SAE,R) depending on the switching distance SAE and on a reflectivity R is stored in the proximity switch, and, after the switching output (6) has been activated, the reflectivity R of the object is determined in addition to the object distance E2 and the switching output (6) is deactivated again only when the condition E2>SAE+H(SAE,R) is satisfied. The invention further relates to an optical proximity switch for performing the method according to the invention.
    Type: Grant
    Filed: February 10, 2015
    Date of Patent: December 4, 2018
    Assignee: IFM ELECTRONIC GMBH
    Inventors: Rolf Fensterle, Hartmut Bielefeldt, Eduard Gjabri
  • METHOD FOR OPERATING AN OPTICAL PROXIMITY SWITCH IN ACCORDANCE WITH THE TIME-OF-FLIGHT PRINCIPLE
    Publication number: 20160363655
    Abstract: The invention relates to a method for operating an optical proximity switch, wherein an object distance E is determined by means of a time-of-flight method and a specified range is limited by an adjustable switching distance SAE. The switching output (6) is activated at an object distance E1<SAE and deactivated at an object distance E2>SAE+H(SAE), wherein a hysteresis H (SAE,R) depending on the switching distance SAE and on a reflectivity R is stored in the proximity switch, and, after the switching output (6) has been activated, the reflectivity R of the object is determined in addition to the object distance E2 and the switching output (6) is deactivated again only when the condition E2>SAE+H(SAE,R) is satisfied. The invention further relates to an optical proximity switch for performing the method according to the invention.
    Type: Application
    Filed: February 10, 2015
    Publication date: December 15, 2016
    Applicant: IFM ELECTRONIC GMBH
    Inventors: Rolf Fensterle, Hartmut Bielefeldt, Eduard Gjabri
  • Optoelectronic sensor and process for detection of an object in a monitored area
    Patent number: 7176443
    Abstract: An optoelectronic sensor, especially a reflection photoelectric barrier and a reflection light sensing device, for detection of an object (2) in a monitored area, with a housing (3) with transmitting and receiving optics (6) and with an evaluation circuit (10). The optoelectronic sensor has an especially simple structure in that there is only one single optoelectronic transmitting and receiving component (14) which sequentially acts as both the opto-transmitter and the opto-receiver in succession in time.
    Type: Grant
    Filed: October 5, 2004
    Date of Patent: February 13, 2007
    Assignee: IFM Electronic GmbH
    Inventors: Holger Lautenschlāger, Jaromir Palata, Martin Buck, Hartmut Bielefeldt, Rolf Fensterle
  • Optoelectronic sensor and process for detection of an object in a monitored area
    Publication number: 20050116149
    Abstract: An optoelectronic sensor, especially a reflection photoelectric barrier and a reflection light sensing device, for detection of an object (2) in a monitored area, with a housing (3) with transmitting and receiving optics (6) and with an evaluation circuit (10). The optoelectronic sensor has an especially simple structure in that there is only one single optoelectronic transmitting and receiving component (14) which sequentially acts as both the opto-transmitter and the opto-receiver in succession in time.
    Type: Application
    Filed: October 5, 2004
    Publication date: June 2, 2005
    Applicant: i f m electronic gmbh
    Inventors: Holger Lautenschlager, Jaromir Palata, Martin Buck, Hartmut Bielefeldt, Rolf Fensterle