Patents by Inventor Takahisa Shiozawa

Takahisa Shiozawa 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: 7760330
    Abstract: An illumination optical system that is used for an exposure apparatus that includes a mirror and exposes an object, illuminates a surface to be illuminated using light from a light source, and includes a filter member arranged at a position that substantially has a Fourier transform relationship with the surface to be illuminated, the filter member including a transmittance distribution preset to correct a non-uniformity of a transmittance distribution of the illumination optical system caused by the mirror.
    Type: Grant
    Filed: January 23, 2008
    Date of Patent: July 20, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takahisa Shiozawa, Yoshio Goto
  • Patent number: 7671967
    Abstract: An exposure method includes the steps of (a) calculating a pupil transmittance distribution in a projection optical system based on a first effective light source distribution of the projection optical system acquired by a measuring apparatus of an exposure apparatus, and a second effective light source distribution derived from a pupil plane light intensity distribution measured on a plate plane using light that has passed the projection optical system without a reticle, (b) calculating an imaging performance by using a result of the pupil transmittance distribution calculating step and the first or second effective light source distributions, (c) adjusting at least one of the effective light source distribution or the projection optical system by using the imaging performance, and (d) exposing the plate based on at least one of the effective light source distribution and the projection optical system that have been adjusted.
    Type: Grant
    Filed: April 18, 2006
    Date of Patent: March 2, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takafumi Miyaharu, Takahisa Shiozawa
  • Patent number: 7468781
    Abstract: An exposure apparatus includes an illumination optical system that includes an optical integrator for forming a secondary light source from the light, and a variable stop arranged at or near a position where the secondary light source is formed, the diameter variable stop that defines a NA of the illumination optical system, a projection optical system that includes an aperture stop arranged at a position substantially optically conjugate with the variable stop, the aperture stop defining a numerical aperture of the projection optical system, and a controller for controlling the aperture diameter of the variable stop as the aperture diameter varies so that an image of the secondary light source can fall within the aperture diameter of the aperture stop.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: December 23, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takahisa Shiozawa
  • Publication number: 20080218719
    Abstract: An exposure apparatus includes an illumination optical system that includes an optical integrator for forming a secondary light source from the light, and a variable stop arranged at or near a position where the secondary light source is formed, the diameter variable stop that defines a NA of the illumination optical system, a projection optical system that includes an aperture stop arranged at a position substantially optically conjugate with the variable stop, the aperture stop defining a numerical aperture of the projection optical system, and a controller for controlling the aperture diameter of the variable stop as the aperture diameter varies so that an image of the secondary light source can fall within the aperture diameter of the aperture stop.
    Type: Application
    Filed: August 7, 2007
    Publication date: September 11, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Takahisa SHIOZAWA
  • Publication number: 20080143993
    Abstract: An illumination optical system that is used for an exposure apparatus that includes a mirror and exposes an object, illuminates a surface to be illuminated using light from a light source, and includes a filter member arranged at a position that substantially has a Fourier transform relationship with the surface to be illuminated, the filter member including a transmittance distribution preset to correct a non-uniformity of a transmittance distribution of the illumination optical system caused by the mirror.
    Type: Application
    Filed: January 23, 2008
    Publication date: June 19, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takahisa Shiozawa, Yoshio Goto
  • Patent number: 7345741
    Abstract: An illumination optical system that is used for an exposure apparatus that includes a mirror and exposes an object, illuminates a surface to be illuminated using light from a light source, and includes a filter member arranged at a position that substantially has a Fourier transform relationship with the surface to be illuminated, the filter member including a transmittance distribution preset to correct a non-uniformity of a transmittance distribution of the illumination optical system caused by the mirror.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: March 18, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takahisa Shiozawa, Yoshio Goto
  • Patent number: 7286206
    Abstract: An exposure apparatus includes an illumination optical system that includes an optical integrator for forming a secondary light source from the light, and a variable stop arranged at or near a position where the secondary light source is formed, the diameter variable stop that defines a NA of the illumination optical system, a projection optical system that includes an aperture stop arranged at a position substantially optically conjugate with the variable stop, the aperture stop defining a numerical aperture of the projection optical system, and a controller for controlling the aperture diameter of the variable stop as the aperture diameter varies so that an image of the secondary light source can fall within the aperture diameter of the aperture stop.
    Type: Grant
    Filed: October 25, 2006
    Date of Patent: October 23, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takahisa Shiozawa
  • Publication number: 20070053033
    Abstract: An exposure apparatus includes an illumination optical system that includes an optical integrator for forming a secondary light source from the light, and a variable stop arranged at or near a position where the secondary light source is formed, the diameter variable stop that defines a NA of the illumination optical system, a projection optical system that includes an aperture stop arranged at a position substantially optically conjugate with the variable stop, the aperture stop defining a numerical aperture of the projection optical system, and a controller for controlling the aperture diameter of the variable stop as the aperture diameter varies so that an image of the secondary light source can fall within the aperture diameter of the aperture stop.
    Type: Application
    Filed: October 25, 2006
    Publication date: March 8, 2007
    Applicant: Canon Kabushiki Kaisha
    Inventor: Takahisa SHIOZAWA
  • Patent number: 7142283
    Abstract: An exposure apparatus includes an illumination optical system that includes an optical integrator for forming a secondary light source from the light, and a variable stop arranged at or near a position where the secondary light source is formed, the diameter variable stop that defines a NA of the illumination optical system, a projection optical system that includes an aperture stop arranged at a position substantially optically conjugate with the variable stop, the aperture stop defining a numerical aperture of the projection optical system, and a controller for controlling the aperture diameter of the variable stop as the aperture diameter varies so that an image of the secondary light source can fall within the aperture diameter of the aperture stop.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: November 28, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takahisa Shiozawa
  • Publication number: 20060238736
    Abstract: A measuring apparatus used for an exposure apparatus that includes an illumination optical system that illuminates a reticle using light from a light source, a reticle stage that supports and drives the reticle, and a projection optical system that projects a pattern of the reticle onto a plate measures an effective light source distribution as an incident angular distribution of the light on a reticle plane of the reticle includes a relaying optical system configured to guide the light that has passed the illumination optical system, and a housing that contains the relaying optical system and is mounted on the reticle stage in place of the reticle.
    Type: Application
    Filed: April 18, 2006
    Publication date: October 26, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Takafumi Miyaharu, Takahisa Shiozawa
  • Publication number: 20050270608
    Abstract: An illumination optical system that is used for an exposure apparatus that includes a mirror and exposes an object, illuminates a surface to be illuminated using light from a light source, and includes a filter member arranged at a position that substantially has a Fourier transform relationship with the surface to be illuminated, the filter member including a transmittance distribution preset to correct a non-uniformity of a transmittance distribution of the illumination optical system caused by the mirror.
    Type: Application
    Filed: June 2, 2005
    Publication date: December 8, 2005
    Inventors: Takahisa Shiozawa, Yoshio Goto
  • Patent number: 6897944
    Abstract: An illumination optical system for illuminating a mask that arranges a predetermined pattern and an auxiliary pattern smaller than the predetermined pattern using light from a light source includes an illumination-light generating mechanism for dividing the light and for forming a quadrupole light intensity distribution around an optical axis on a predetermined surface that has substantially a Fourier conversion relationship with the mask, so as to resolve the predetermined pattern and restrain the auxiliary pattern from resolving, wherein at least one of a size of each pole of the quadrupole light intensity distribution or a distance between the optical axis and each pole of the quadrupole light intensity distribution are variable.
    Type: Grant
    Filed: July 30, 2003
    Date of Patent: May 24, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takahisa Shiozawa
  • Publication number: 20040246456
    Abstract: An exposure apparatus includes an illumination optical system that includes an optical integrator for forming a secondary light source from the light, and a variable stop arranged at or near a position where the secondary light source is formed, the diameter variable stop that defines a NA of the illumination optical system, a projection optical system that includes an aperture stop arranged at a position substantially optically conjugate with the variable stop, the aperture stop defining a numerical aperture of the projection optical system, and a controller for controlling the aperture diameter of the variable stop as the aperture diameter varies so that an image of the secondary light source can fall within the aperture diameter of the aperture stop.
    Type: Application
    Filed: June 3, 2004
    Publication date: December 9, 2004
    Inventor: Takahisa Shiozawa
  • Patent number: 6757050
    Abstract: An exposure method and apparatus wherein exposures are made repeatedly and wherein an amount of exposure is controlled on the basis of detection of an integrated light quantity of a portion of exposure light used for an exposure. In response to completion of each exposure or exposures of a determined number, a ratio between intensity of the exposure light upon a substrate being exposed and the portion of the exposure light is detected, which ratio is used for the exposure amount control.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: June 29, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takahisa Shiozawa
  • Publication number: 20040022068
    Abstract: An illumination optical system for illuminating a mask that arranges a predetermined pattern and an auxiliary pattern smaller than the predetermined pattern using light from a light source includes an illumination-light generating mechanism for dividing the light and for forming a quadrupole light intensity distribution around an optical axis on a predetermined surface that has substantially a Fourier conversion relationship with the mask, so as to resolve the predetermined pattern and restrain the auxiliary pattern from resolving, wherein at least one of a size of each pole of the quadrupole light intensity distribution or a distance between the optical axis and each pole of the quadrupole light intensity distribution are variable.
    Type: Application
    Filed: July 30, 2003
    Publication date: February 5, 2004
    Inventor: Takahisa Shiozawa
  • Patent number: 6636295
    Abstract: An illumination system for lithography includes an optical system for projecting light from a laser onto a mask. The optical system includes a birefringent element being effective to dissolve polarization of light from the laser. The birefringent element is made of CaF2.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: October 21, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventor: Takahisa Shiozawa
  • Publication number: 20010052968
    Abstract: Disclosed is an exposure apparatus for exposing a substrate with a pattern of a mask, wherein polarized light from a light source is transformed into light having its polarization state, in a section perpendicular to an optical axis, changed, wherein the light is divided with respect to a wavefront into plural light beams which are then superposed one upon another on a light entrance surface of an optical integrator, and wherein the mask is illuminated with light beams from the optical integrator.
    Type: Application
    Filed: March 30, 2001
    Publication date: December 20, 2001
    Inventor: Takahisa Shiozawa
  • Patent number: 5892573
    Abstract: An exposure apparatus including an illumination optical system, a first light receiving system for receiving a portion of exposure light from the illumination optical system, a movable reticle stage having a transmitting portion for transmitting exposure light, and a second light receiving system for receiving the exposure light transmitted through the transmitting portion. Accordingly, the exposure apparatus is able to correct the sensitivity of the first light receiving system without unloading a reticle.
    Type: Grant
    Filed: September 30, 1996
    Date of Patent: April 6, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhiro Takahashi, Takahisa Shiozawa
  • Patent number: 5726740
    Abstract: An illumination device, includes a secondary light source forming system having a deflecting member with a conical light deflecting surface for transforming received light into substantially ring-like light, the secondary light source forming system forming a ring-like secondary light source by using the ring-like light; and an optical system for projecting divergent lights from portions of the secondary light source obliquely onto a surface to be illuminated so that the projected lights are superposed one upon another on the surface.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: March 10, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takahisa Shiozawa, Masato Muraki, Hiroyuki Ishii, Shigeru Hayata
  • Patent number: 5719617
    Abstract: An illumination device for illuminating a surface to be illuminated, includes a light source and an irradiation optical system for mixedly projecting light beams from the light source to the surface, wherein the irradiation optical system has a first focal point with respect to a first plane, which is disposed at a position out of the surface.
    Type: Grant
    Filed: February 16, 1995
    Date of Patent: February 17, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuhiro Takahashi, Takahisa Shiozawa