Patents by Inventor Keiji Yada

Keiji Yada 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).

  • Patent number: 7221731
    Abstract: To provide an X-ray microscopic inspection apparatus capable of performing non-destructive inspection with high resolving power within a very short period, and having advantageous functions such as a high precision electron probe control function, a CT function, an elemental analysis function, and a target switching function. The apparatus includes a magnetic superposition lens having a magnetic field generating portion disposed in the vicinity of an electron generating portion of an electron gun; reflected electron detecting means having a detecting portion disposed above the target for X-ray generation, for detecting a reflected electron from the target; and electron image generating means for performing imaging of a target surface utilizing the signals from the reflected electron detecting means, wherein the apparatus is arranged so that alignment including focus adjustment to the target for X-ray generation and astigmatism correction may be performed based on image information of the electron image.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: May 22, 2007
    Assignee: Tohken Co., Ltd.
    Inventors: Keiji Yada, Hiromi Kai, Yasushi Saito
  • Patent number: 7218703
    Abstract: To provide an X-ray microscopic inspection apparatus capable of performing non-destructive inspection with high resolving power equal to or less than 0.1 ?m in a very short period, and largely contributing to the nano-technology field. In the X-ray microscopic inspection apparatus having X-ray generating means for generating an X-ray by allowing an electron beam from an electron source to impinge on a target for X-ray generation, for inspecting an object to be inspected by utilizing the X-ray, a magnetic field superposition lens having a magnetic field generating portion disposed in the vicinity of an electron generating portion of an electron gun is included as a component element of the X-ray generating means. Further, the apparatus includes a liquid metal electron source using liquid metal or a thermal field emission electron source as the electron source, as a component element of the X-ray generating means.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: May 15, 2007
    Assignee: Tohken Co., Ltd.
    Inventors: Keiji Yada, Hiromi Kai, Yasushi Saito
  • Publication number: 20050111624
    Abstract: To provide an X-ray microscopic inspection apparatus capable of performing non-destructive inspection with high resolving power equal to or less than 0.1 ?m in a very short period, and largely contributing to the nano-technology field. In the X-ray microscopic inspection apparatus having X-ray generating means for generating an X-ray by allowing an electron beam from an electron source to impinge on a target for X-ray generation, for inspecting an object to be inspected by utilizing the X-ray, a magnetic field superposition lens having a magnetic field generating portion disposed in the vicinity of an electron generating portion of an electron gun is included as a component element of the X-ray generating means. Further, the apparatus includes a liquid metal electron source using liquid metal or a thermal field emission electron source as the electron source, as a component element of the X-ray generating means.
    Type: Application
    Filed: November 21, 2003
    Publication date: May 26, 2005
    Inventors: Keiji Yada, Hiromi Kai, Yasushi Saito
  • Publication number: 20040208280
    Abstract: To provide an X-ray microscopic inspection apparatus capable of performing non-destructive inspection with high resolving power within a very short period, and having advantageous functions such as a high precision electron probe control function, a CT function, an elemental analysis function, and a target switching function. The apparatus includes a magnetic superposition lens having a magnetic field generating portion disposed in the vicinity of an electron generating portion of an electron gun; reflected electron detecting means having a detecting portion disposed above the target for X-ray generation, for detecting a reflected electron from the target; and electron image generating means for performing imaging of a target surface utilizing the signals from the reflected electron detecting means, wherein the apparatus is arranged so that alignment including focus adjustment to the target for X-ray generation and astigmatism correction may be performed based on image information of the electron image.
    Type: Application
    Filed: November 21, 2003
    Publication date: October 21, 2004
    Inventors: Keiji Yada, Hiromi Kai, Yasushi Saito
  • Patent number: 4570072
    Abstract: Disclosed is an electromagnetic lens polepiece structure for use in an electron microscope comprising an upper polepiece and an opposite lower polepiece, each having a lens bore, wherein the lens bore portion of the upper polepiece protrudes toward the lens bore of the lower polepiece. The protrudant lens bore portion allows the provision of an X-ray conducting bore for the measurement without disturbing the magnetic field of the lens. This makes it possible a smaller lens bore and, consequently, the spherical aberration is reduced and the resolution of the microscope is improved. The protrudant lens bore structure allows the upper polepiece to be divided into two sections so that the bore section can be replaced easily for the measurement of X-rays.
    Type: Grant
    Filed: January 14, 1983
    Date of Patent: February 11, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Chikara Kimura, Keiji Yada