Patents Assigned to LEEPL Corporation
  • Patent number: 6894295
    Abstract: In an electron beam proximity exposure apparatus comprising an electron beam source, which emits a collimated electron beam, a mask substrate on which a plurality of masks with apertures are formed, a mask moving mechanism, which moves the mask substrate, and a stage, which holds and moves an object, the mask moving mechanism moves the mask substrate so that one of the plurality of masks is arranged on a path of the electron beam in proximity to a surface of the object, and a pattern corresponding to the aperture of the one of the plurality of masks is exposed on the surface of the object with the electron beam having passed through the aperture. Thus, the frequency of taking the mask out of the apparatus to exchange the mask is reduced, so that the throughput of the apparatus is improved.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: May 17, 2005
    Assignee: LEEPL Corporation
    Inventors: Nobuo Shimazu, Takao Utsumi
  • Patent number: 6727507
    Abstract: The electron beam proximity exposure apparatus comprises: an electron beam source which emits an electron beam; an electron beam shaping device which shapes the electron beam; a mask which has an aperture and is disposed on a path of the shaped electron beam; a deflecting and scanning device which deflects the electron beam to scan the mask with the shaped electron beam; and a stage which holds and moves an object, wherein the mask is disposed in proximity to a surface of the object, and a pattern corresponding to the aperture of the mask is exposed on the surface of the object with the electron beam having passed through the aperture, wherein the electron beam shaping device shapes the electron beam into a slender beam of which cross section has a small width in a direction of the scanning and a large width in a direction perpendicular to the direction of the scanning.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: April 27, 2004
    Assignee: LEEPL Corporation
    Inventors: Nobuo Shimazu, Takao Utsumi
  • Patent number: 6717157
    Abstract: The mask inspecting apparatus is incorporated into an electron beam proximity exposure apparatus in which a mask is arranged in proximity to a wafer, and a mask pattern formed on the mask is transferred onto a resist layer on the wafer by scanning the mask with an electron beam. The mask inspecting apparatus comprises a scanning electron microscope (SEM) arranged on a wafer stage, and a stage drive device which shifts the wafer stage so that an electron detector of the SEM can receive electrons originating from the electron beam transmitting through the mask pattern of the mask in an inspection of the mask. The SEM thereby capture an image of the mask pattern on the lower face of the mask. Thus, the mask inspection can be performed using an electron beam intended for use in proximity exposure in the electron beam proximity exposure apparatus.
    Type: Grant
    Filed: July 3, 2002
    Date of Patent: April 6, 2004
    Assignee: LEEPL Corporation
    Inventor: Takao Utsumi
  • Patent number: 6703623
    Abstract: The electronic beam proximity exposure apparatus comprises: an electron beam proximity exposure section which exposes a pattern corresponding to an aperture of a mask on a surface of an object with an electron beam having passed through the aperture of the mask, the mask being disposed in proximity to the surface of the object; a mask inspecting section which inspects the mask; and a mask carrying mechanism which carries the mask between the electron beam proximity exposure section and the mask inspecting section, and is characterized in that the electron beam proximity exposure section, the mask inspecting section and the mask carrying mechanism are communicated with one another through a common vacuum path so that the mask can be carried in a vacuum condition between the electron beam proximity exposure section and the mask inspecting section.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: March 9, 2004
    Assignee: LEEPL Corporation
    Inventors: Nobuo Shimazu, Takao Utsumi
  • Publication number: 20040004195
    Abstract: The mask inspecting apparatus is incorporated into an electron beam proximity exposure apparatus in which a mask is arranged in proximity to a wafer, and a mask pattern formed on the mask is transferred onto a resist layer on the wafer by scanning the mask with an electron beam. The mask inspecting apparatus comprises a scanning electron microscope (SEM) arranged on a wafer stage, and a stage drive device which shifts the wafer stage so that an electron detector of the SEM can receive electrons originating from the electron beam transmitting through the mask pattern of the mask in an inspection of the mask. The SEM thereby captures an image of the mask pattern on the lower face of the mask. Thus, the mask inspection can be performed using an electron beam intended for use in proximity exposure in the electron beam proximity exposure apparatus.
    Type: Application
    Filed: July 3, 2002
    Publication date: January 8, 2004
    Applicant: LEEPL Corporation
    Inventor: Takao Utsumi
  • Patent number: 6624430
    Abstract: A calibration mask having a plurality of marks previously formed thereon is loaded, and a deflector is used to control deflection of electron beams so that the electron beams are incident on a mark of the calibration mask. The electron beams, having passed through the mark, impinge on a first Faraday cup having a first mark and on a second Faraday cup having a second mark. Then, positional coordinates on an XY stage are detected when electrical quantities detected by the Faraday cups are largest. The positional coordinates on the above mentioned XY stage are detected for each of the marks of the calibration mask. Then, according to the positional coordinates on the XY stage detected in this manner and a difference in height between the marks, the inclination of the electron beams is calculated for the position input to each mark of the calibration mask. Thus, the inclination of electron beams can be accurately measured.
    Type: Grant
    Filed: May 22, 2002
    Date of Patent: September 23, 2003
    Assignee: Leepl Corporation
    Inventor: Akira Higuchi