Patents by Inventor Yasuyuki Shibayama

Yasuyuki Shibayama 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).

  • Publication number: 20200201008
    Abstract: An optical system includes a reflective optical system on a magnification side along an optical path of the projection optical system and a refractive optical system on a reduction side along the optical path. The reflective optical system includes one reflective optical element having a power. The refractive optical system includes a front group on the magnification side and a rear group on the reduction side. The front group having, in order from the magnification side toward the reduction side, a first lens group with a positive or negative refractive power, a second lens group, and a third lens group with a positive refractive power. The rear group has a positive refractive power. The first lens group moves to the magnification side, and the second lens group and the third lens group move to the reduction side in a change in focus from a long distance to a short distance.
    Type: Application
    Filed: March 4, 2020
    Publication date: June 25, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Yohei TAKANO, Hibiki TATSUNO, Yasuyuki SHIBAYAMA
  • Patent number: 10606042
    Abstract: A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.
    Type: Grant
    Filed: May 1, 2019
    Date of Patent: March 31, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Hibiki Tatsuno, Kiichiro Nishina, Yasuyuki Shibayama, Takanobu Osaka, Makoto Hirakawa
  • Patent number: 10585269
    Abstract: An optical system includes a reflective optical system on a magnification side along an optical path of the projection optical system and a refractive optical system on a reduction side along the optical path. The reflective optical system includes one reflective optical element having a power. The refractive optical system includes a front group on the magnification side and a rear group on the reduction side. The front group having, in order from the magnification side toward the reduction side, a first lens group with a positive or negative refractive power, a second lens group, and a third lens group with a positive refractive power. The rear group has a positive refractive power. The first lens group moves to the magnification side, and the second lens group and the third lens group move to the reduction side in a change in focus from a long distance to a short distance.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: March 10, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Yohei Takano, Hibiki Tatsuno, Yasuyuki Shibayama
  • Publication number: 20200004129
    Abstract: An image display device includes an image display element, a light source, an illumination system, a projector system comprising a refractive optical system including a plurality of lens groups, and a mirror train including a curved mirror, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of the image display element, and a second focus structure configured to move the respective lens groups along the normal line of the image display element by different amounts from those of the first focus structure.
    Type: Application
    Filed: September 10, 2019
    Publication date: January 2, 2020
    Inventors: Hibiki Tatsuno, Kiichiro Nishina, Yasuyuki Shibayama, Takanobu Osaka, Makoto Hirakawa
  • Patent number: 10451961
    Abstract: An image display device includes an image display element, a light source, an illumination system, a projector system comprising a refractive optical system including a plurality of lens groups, and a mirror train including a curved mirror, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of the image display element, and a second focus structure configured to move the respective lens groups along the normal line of the image display element by different amounts from those of the first focus structure.
    Type: Grant
    Filed: November 5, 2012
    Date of Patent: October 22, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hibiki Tatsuno, Kiichiro Nishina, Yasuyuki Shibayama, Takanobu Osaka, Makoto Hirakawa
  • Publication number: 20190258036
    Abstract: A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.
    Type: Application
    Filed: May 1, 2019
    Publication date: August 22, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Hibiki TATSUNO, Kiichiro NISHINA, Yasuyuki SHIBAYAMA, Takanobu OSAKA, Makoto HIRAKAWA
  • Publication number: 20190170988
    Abstract: An optical system includes a reflective optical system on a magnification side along an optical path of the projection optical system and a refractive optical system on a reduction side along the optical path. The reflective optical system includes one reflective optical element having a power. The refractive optical system includes a front group on the magnification side and a rear group on the reduction side. The front group having, in order from the magnification side toward the reduction side, a first lens group with a positive or negative refractive power, a second lens group, and a third lens group with a positive refractive power. The rear group has a positive refractive power. The first lens group moves to the magnification side, and the second lens group and the third lens group move to the reduction side in a change in focus from a long distance to a short distance.
    Type: Application
    Filed: February 7, 2019
    Publication date: June 6, 2019
    Applicant: Ricoh Company, Ltd.
    Inventors: Yohei TAKANO, Hibiki Tatsuno, Yasuyuki Shibayama
  • Patent number: 10310238
    Abstract: A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.
    Type: Grant
    Filed: September 14, 2017
    Date of Patent: June 4, 2019
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hibiki Tatsuno, Kiichiro Nishina, Yasuyuki Shibayama, Takanobu Osaka, Makoto Hirakawa
  • Patent number: 10228546
    Abstract: An optical system includes a reflective optical system on a magnification side along an optical path of the projection optical system and a refractive optical system on a reduction side along the optical path. The reflective optical system includes one reflective optical element having a power. The refractive optical system includes a front group on the magnification side and a rear group on the reduction side. The front group having, in order from the magnification side toward the reduction side, a first lens group with a positive or negative refractive power, a second lens group, and a third lens group with a positive refractive power. The rear group has a positive refractive power. The first lens group moves to the magnification side, and the second lens group and the third lens group move to the reduction side in a change in focus from a long distance to a short distance.
    Type: Grant
    Filed: November 24, 2017
    Date of Patent: March 12, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Yohei Takano, Hibiki Tatsuno, Yasuyuki Shibayama
  • Publication number: 20180074302
    Abstract: An optical system includes a reflective optical system on a magnification side along an optical path of the projection optical system and a refractive optical system on a reduction side along the optical path. The reflective optical system includes one reflective optical element having a power. The refractive optical system includes a front group on the magnification side and a rear group on the reduction side. The front group having, in order from the magnification side toward the reduction side, a first lens group with a positive or negative refractive power, a second lens group, and a third lens group with a positive refractive power. The rear group has a positive refractive power. The first lens group moves to the magnification side, and the second lens group and the third lens group move to the reduction side in a change in focus from a long distance to a short distance.
    Type: Application
    Filed: November 24, 2017
    Publication date: March 15, 2018
    Inventors: Yohei TAKANO, Hibiki TATSUNO, Yasuyuki SHIBAYAMA
  • Patent number: 9864260
    Abstract: An image display apparatus and an image display unit. The image display apparatus and the image display unit includes a light source configured to emit light, an illumination optical system including a luminous body forming device configured to form a secondary luminous body, the illumination optical system guiding the light emitted from the light source, an optical modulation element including a plurality of reflection planes to modulate the light guided by the illumination optical system, and a projection optical system including a projection lens system and a barrel storing the projection lens system, the projection optical system projecting the light modulated by the optical modulation element onto a projection plane. The barrel satisfies an equation ?<0.71H+8.5, where ? denotes an outside diameter of a front end of the barrel on a light entering side and H denotes distance between the reflection planes and the front end of the barrel.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: January 9, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuyuki Shibayama, Hibiki Tatsuno, Yohei Takano
  • Patent number: 9864177
    Abstract: An optical system includes a reflective optical system on a magnification side along an optical path of the projection optical system and a refractive optical system on a reduction side along the optical path. The reflective optical system includes one reflective optical element having a power. The refractive optical system includes a front group on the magnification side and a rear group on the reduction side. The front group having, in order from the magnification side toward the reduction side, a first lens group with a positive or negative refractive power, a second lens group, and a third lens group with a positive refractive power. The rear group has a positive refractive power. The first lens group moves to the magnification side, and the second lens group and the third lens group move to the reduction side in a change in focus from a long distance to a short distance.
    Type: Grant
    Filed: August 8, 2016
    Date of Patent: January 9, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Yohei Takano, Hibiki Tatsuno, Yasuyuki Shibayama
  • Publication number: 20180003928
    Abstract: A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.
    Type: Application
    Filed: September 14, 2017
    Publication date: January 4, 2018
    Inventors: Hibiki TATSUNO, Kiichiro Nishina, Yasuyuki Shibayama, Takanobu Osaka, Makoto Hirakawa
  • Patent number: 9841584
    Abstract: A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: December 12, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hibiki Tatsuno, Kiichiro Nishina, Yasuyuki Shibayama, Takanobu Osaka, Makoto Hirakawa
  • Patent number: 9784952
    Abstract: A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: October 10, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hibiki Tatsuno, Kiichiro Nishina, Yasuyuki Shibayama, Takanobu Osaka, Makoto Hirakawa
  • Patent number: 9690179
    Abstract: An illumination unit includes a light source, an optical mixer to form secondary light sources from a light beam from the light source, and an illumination system to illuminate an optical modulator with the light beam from the optical mixer, including an optical element having an anamorphic surface, in which the optical element is rotated at a certain rotational angle about a rotational axis which is a normal line from a vertex of a surface of the optical element.
    Type: Grant
    Filed: September 16, 2014
    Date of Patent: June 27, 2017
    Assignee: RICOH COMPANY, LTD.
    Inventor: Yasuyuki Shibayama
  • Publication number: 20170064268
    Abstract: An image display apparatus and an image display unit. The image display apparatus and the image display unit includes a light source configured to emit light, an illumination optical system including a luminous body forming device configured to form a secondary luminous body, the illumination optical system guiding the light emitted from the light source, an optical modulation element including a plurality of reflection planes to modulate the light guided by the illumination optical system, and a projection optical system including a projection lens system and a barrel storing the projection lens system, the projection optical system projecting the light modulated by the optical modulation element onto a projection plane. The barrel satisfies an equation ?<0.71H+8.5, where ? denotes an outside diameter of a front end of the barrel on a light entering side and H denotes distance between the reflection planes and the front end of the barrel.
    Type: Application
    Filed: August 4, 2016
    Publication date: March 2, 2017
    Inventors: Yasuyuki SHIBAYAMA, Hibiki TATSUNO, Yohei TAKANO
  • Publication number: 20170059971
    Abstract: An optical system includes a reflective optical system on a magnification side along an optical path of the projection optical system and a refractive optical system on a reduction side along the optical path. The reflective optical system includes one reflective optical element having a power. The refractive optical system includes a front group on the magnification side and a rear group on the reduction side. The front group having, in order from the magnification side toward the reduction side, a first lens group with a positive or negative refractive power, a second lens group, and a third lens group with a positive refractive power. The rear group has a positive refractive power. The first lens group moves to the magnification side, and the second lens group and the third lens group move to the reduction side in a change in focus from a long distance to a short distance.
    Type: Application
    Filed: August 8, 2016
    Publication date: March 2, 2017
    Inventors: Yohei Takano, Hibiki Tatsuno, Yasuyuki Shibayama
  • Publication number: 20160231542
    Abstract: A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.
    Type: Application
    Filed: April 19, 2016
    Publication date: August 11, 2016
    Inventors: Hibiki TATSUNO, Kiichiro Nishina, Yasuyuki Shibayama, Takanobu Osaka, Makoto Hirakawa
  • Patent number: 9348121
    Abstract: A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: May 24, 2016
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hibiki Tatsuno, Kiichiro Nishina, Yasuyuki Shibayama, Takanobu Osaka, Makoto Hirakawa