Patents by Inventor Lifu ZHANG

Lifu ZHANG 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).

  • SERVO, SERVO CONTROL SYSTEM AND COMMUNICATION METHOD THEREOF
    Publication number: 20180052435
    Abstract: A communication method of a servo control system includes: a servo acquiring a preset delay time when a first action command is received from a main controller via serial data bus; the servo sending feedback information to the main controller according to the preset delay time; wherein each servo corresponds to a different preset delay time, and the feedback information is configured to identify work status of the servo. A servo and a servo control system for performing the communication method are also provided.
    Type: Application
    Filed: December 30, 2016
    Publication date: February 22, 2018
    Inventors: TINGSHUANG HUANG, Lifu Zhang, Youjun Xiong
  • METHOD FOR SERVO LOCKING CONTROL AND SERVO
    Publication number: 20180011478
    Abstract: A method for servo locking control is provided. A servo enters a first lock state, and determines whether the current angular deflection values of the servo in a first preset period are all greater than a preset angular deflection value. When the current angular deflection values of the servo in the first preset period are all greater than the preset angular deflection value, the servo enters a second lock state, and determines whether the current angular changing values of the servo in a second preset period are all less than a preset angular changing value. When the current angular changing values of the servo in the second preset period are all less than the preset angular changing value, the servo enters the first lock state. A servo for performing the method for servo locking control is also provided.
    Type: Application
    Filed: December 9, 2016
    Publication date: January 11, 2018
    Inventors: Lifu Zhang, Tingshuang Huang, Youjun Xiong
  • Optical parametric oscillation laser based on I-type quasi-phase matching
    Patent number: 9748728
    Abstract: Provided is an optical parametric oscillation laser based on I-type quasi-phase matching. The optical parametric oscillation laser comprises a femtosecond laser pumping source (1), an input coupling mirror (3), an Mg:PPLN crystal (4), an output coupling mirror (7) and a beam splitter prism (12), wherein the femtosecond laser pumping source (1) of a synchronous pump, the input coupling mirror (3), the Mg:PPLN crystal (4), the output coupling mirror (7) and the beam splitter prism (12) are sequentially placed.
    Type: Grant
    Filed: June 15, 2015
    Date of Patent: August 29, 2017
    Assignee: SHENZHEN UNIVERSITY
    Inventors: Haizhe Zhong, Ying Li, Lifu Zhang, Shuangchun Wen, Dianyuan Fan
  • OPTICAL PARAMETRIC OSCILLATION LASER BASED ON I-TYPE QUASI-PHASE MATCHING
    Publication number: 20170018904
    Abstract: Provided is an optical parametric oscillation laser based on I-type quasi-phase matching. The optical parametric oscillation laser comprises a femtosecond laser pumping source (1), an input coupling mirror (3), an Mg:PPLN crystal (4), an output coupling mirror (7) and a beam splitter prism (12), wherein the femtosecond laser pumping source (1) of a synchronous pump, the input coupling mirror (3), the Mg:PPLN crystal (4), the output coupling mirror (7) and the beam splitter prism (12) are sequentially placed.
    Type: Application
    Filed: June 15, 2015
    Publication date: January 19, 2017
    Inventors: Haizhe ZHONG, Ying LI, Lifu ZHANG, Shuangchun WEN, Dianyuan FAN