Patents by Inventor Tetsuichiro Okumura

Tetsuichiro Okumura 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: 9995918
    Abstract: Provided is a zoom lens, including, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a positive refractive power; a fifth lens unit having a negative refractive power; and a sixth lens unit having a positive refractive power, in which an interval between the first lens unit and the second lens unit is increased during zooming from a wide angle end to a telephoto end, an interval between adjacent lens units is changed during zooming, and the lens shapes of lenses included in the first lens unit are appropriately set.
    Type: Grant
    Filed: November 18, 2016
    Date of Patent: June 12, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Tetsuichiro Okumura
  • Patent number: 9946065
    Abstract: Provided is an optical system, including, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, which is configured to move during focusing, and a third lens unit having a positive or negative refractive power, the first lens unit consisting of, in order from the object side to the image side, a positive lens (Gp1), a positive lens (Gp2), and a subunit including a plurality of lenses, the subunit including at least one negative lens, in which an Abbe number ?dGp1 of a material of the positive lens (Gp1), an Abbe number ?dGn1 of a material of a negative lens (Gn1) closest to the object side among the negative lenses of the subunit, and a partial dispersion ratio ?gFGn1 of the material of the negative lens (Gn1) are each appropriately set.
    Type: Grant
    Filed: August 9, 2016
    Date of Patent: April 17, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Tetsuichiro Okumura
  • Patent number: 9874733
    Abstract: A zoom lens includes, in order from an object side to an image side: a first lens unit having a negative refractive power; and a second lens unit having a positive refractive power, the interval between the adjacent lens units varying during zooming. The configuration of the first lens unit, the focal length f1 of the first lens unit, and the back focus Sk at the wide angle end are appropriately set.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: January 23, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Tetsuichiro Okumura
  • Publication number: 20170160526
    Abstract: Provided is a zoom lens, including, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a positive refractive power; a fifth lens unit having a negative refractive power; and a sixth lens unit having a positive refractive power, in which an interval between the first lens unit and the second lens unit is increased during zooming from a wide angle end to a telephoto end, an interval between adjacent lens units is changed during zooming, and the lens shapes of lenses included in the first lens unit are appropriately set.
    Type: Application
    Filed: November 18, 2016
    Publication date: June 8, 2017
    Inventor: Tetsuichiro OKUMURA
  • Publication number: 20170052352
    Abstract: Provided is an optical system, including, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, which is configured to move during focusing, and a third lens unit having a positive or negative refractive power, the first lens unit consisting of, in order from the object side to the image side, a positive lens (Gp1), a positive lens (Gp2), and a subunit including a plurality of lenses, the subunit including at least one negative lens, in which an Abbe number ?dGp1 of a material of the positive lens (Gp1), an Abbe number ?dGn1 of a material of a negative lens (Gn1) closest to the object side among the negative lenses of the subunit, and a partial dispersion ratio ?gFGn1 of the material of the negative lens (Gn1) are each appropriately set.
    Type: Application
    Filed: August 9, 2016
    Publication date: February 23, 2017
    Inventor: Tetsuichiro Okumura
  • Publication number: 20170045720
    Abstract: A zoom lens includes, in order from an object side to an image side: a first lens unit having a negative refractive power; and a second lens unit having a positive refractive power, the interval between the adjacent lens units varying during zooming. The configuration of the first lens unit, the focal length f1 of the first lens unit, and the back focus Sk at the wide angle end are appropriately set.
    Type: Application
    Filed: August 2, 2016
    Publication date: February 16, 2017
    Inventor: Tetsuichiro Okumura
  • Patent number: 8320050
    Abstract: A zoom lens includes in order from an object side to an image side and arranged along an optical axis thereof, a first lens unit having a negative refractive power, and a second lens unit having a positive refractive power. A distance between each lens unit changes when zooming from a wide-angle end to a telephoto end. The first lens unit includes a first lens sub-unit including a positive lens element and a negative lens element, and having a negative refractive power, and a second lens sub-unit including a single negative lens element. Focusing is performed by moving the second lens sub-unit in an optical axis direction, a focal length of the second lens sub-unit f1b and a focal length of the entire zoom lens fw at a wide-angle end are suitably set based on predetermined mathematical expressions.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: November 27, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tetsuichiro Okumura
  • Publication number: 20120044576
    Abstract: A zoom lens includes in order from an object side to an image side and arranged along an optical axis thereof, a first lens unit having a negative refractive power, and a second lens unit having a positive refractive power. A distance between each lens unit changes when zooming from a wide-angle end to a telephoto end. The first lens unit includes a first lens sub-unit including a positive lens element and a negative lens element, and having a negative refractive power, and a second lens sub-unit including a single negative lens element. Focusing is performed by moving the second lens sub-unit in an optical axis direction, a focal length of the second lens sub-unit f1b and a focal length of the entire zoom lens fw at a wide-angle end are suitably set based on predetermined mathematical expressions.
    Type: Application
    Filed: August 9, 2011
    Publication date: February 23, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Tetsuichiro Okumura