Patents by Inventor Toshihisa Yamashita

Toshihisa Yamashita 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).

  • Welding laser focal point position detecting apparatus
    Patent number: 6377904
    Abstract: The present invention provides a welding laser focal point position detecting apparatus capable of directly detecting a welding laser focal point independently of the position of a converging means for converging a welding laser beam. The apparatus comprises: a photo element 5 for receiving plasma light 4 caused at a welding position by a laser beam; a sampler 6 for sampling the photo-electrically converted output from the photo element; variance value calculator 7 for calculating a variance value Var of the discrete light intensity values obtained by the sampler; a focal point table 8 which specifies laser focal points corresponding to the variance value Var; and a focal point calculator for referencing the focal point table 8 so as to convert the light intensity data obtained by the variance value calculator 7, into a welding laser focal point position P for output.
    Type: Grant
    Filed: May 28, 1999
    Date of Patent: April 23, 2002
    Assignee: Suzuki Motor Corporation
    Inventor: Toshihisa Yamashita