Patents by Inventor Satoshi Maetaki

Satoshi Maetaki 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: 11092778
    Abstract: An optical system according to an example embodiment includes a first lens unit that has a positive refractive power, and a second lens unit that is disposed on an image side of the first lens unit and that has a positive refractive power. The second lens unit moves when focusing from infinity to an object at near distance. The second lens unit includes, disposed in order from the object side towards an image side, a first positive lens, an aperture stop, and a second positive lens. Anomalous partial dispersibilities of the first positive lens and the second positive lens are defined.
    Type: Grant
    Filed: June 28, 2019
    Date of Patent: August 17, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Satoshi Maetaki
  • Patent number: 10983315
    Abstract: An optical system according to the present invention is an optical system consisting of a front lens group having a positive or negative refractive power, an aperture stop, and a rear lens group having a positive or negative refractive power that are placed in order from an object side to an image side. In the optical system, relationships between a distance on an optical axis between a negative lens having the strongest refractive power in the rear lens group and a positive lens placed on the image side of the negative lens, an opening angle of the positive lens, a back focus of the optical system, and a focal length of the optical system are appropriately determined.
    Type: Grant
    Filed: February 22, 2019
    Date of Patent: April 20, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventor: Satoshi Maetaki
  • Patent number: 10895714
    Abstract: An optical system used in an imaging apparatus includes an optical element. In a case where the optical element is disposed on a magnification side with respect to an intersection point of an optical axis and a chief paraxial ray, the optical element is a negative lens, and in a case where the optical element is disposed on a reduction side with respect to the intersection point, the optical element is a positive lens. The optical element is configured to satisfy all of the following conditional expressions: 30??d?40 1.225?[nd?(14.387/?d)]?1.276 0.4300?[?gF?(2.9795/?d)]?0.5010, where ?d represents an Abbe number of the optical element, ?gF is a partial dispersion ratio of the optical element for g-line and F-line, and nd is a refractive index of the optical element for d-line.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: January 19, 2021
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shunji Iwamoto, Shinichiro Saito, Satoshi Maetaki, Takahiro Hatada, Suguru Inoue
  • Patent number: 10539768
    Abstract: Provided is a rear converter optical system which is detachably mounted on an image side of a main lens system to increase a focal length of the main lens system, in which an effective diameter ?im of an imaging area of the main lens system, an effective diameter ?cr of a lens surface closest to the image side of the rear converter optical system, a lateral magnification ?c of the rear converter optical system in the case where the rear converter optical system is mounted on the main lens system, a backfocus skc in the case where the rear converter optical system is mounted on the main lens system are appropriately set.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: January 21, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Satoshi Maetaki
  • Publication number: 20200012073
    Abstract: An optical system according to an example embodiment includes a first lens unit that has a positive refractive power, and a second lens unit that is disposed on an image side of the first lens unit and that has a positive refractive power. The second lens unit moves when focusing from infinity to an object at near distance. The second lens unit includes, disposed in order from the object side towards an image side, a first positive lens, an aperture stop, and a second positive lens. Anomalous partial dispersibilities of the first positive lens and the second positive lens are defined.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 9, 2020
    Inventor: Satoshi Maetaki
  • Publication number: 20190265450
    Abstract: An optical system according to the present invention is an optical system consisting of a front lens group having a positive or negative refractive power, an aperture stop, and a rear lens group having a positive or negative refractive power that are placed in order from an object side to an image side. In the optical system, relationships between a distance on an optical axis between a negative lens having the strongest refractive power in the rear lens group and a positive lens placed on the image side of the negative lens, an opening angle of the positive lens, a back focus of the optical system, and a focal length of the optical system are appropriately determined.
    Type: Application
    Filed: February 22, 2019
    Publication date: August 29, 2019
    Inventor: Satoshi Maetaki
  • Patent number: 10379325
    Abstract: An optical system includes a negative lens satisfying the following conditional expressions: 30??d?40, 1.225?[nd?(14.387/?d)]?1.276, and 0.4300?[?gF?(2.9795/?d)]?0.5010, where ?d is an Abbe number of the negative lens, ?gF is a partial dispersion ratio of the negative lens at a g-line and an F-line, and nd is a refractive index of the negative lens at a d-line.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: August 13, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shunji Iwamoto, Shinichiro Saito, Satoshi Maetaki, Takahiro Hatada, Suguru Inoue
  • Patent number: 10353185
    Abstract: A conversion lens having a negative refractive power includes a positive lens GP. The positive lens GP satisfies all the following conditional expressions: 30??d?40, 1.225?[nd?(14.387/?d)]?1.276, and 0.4300?[?gF?(2.9795/?d)]?0.5010, where ?d is an Abbe number of the positive lens GP, ?gF is a partial dispersion ratio of the positive lens GP for g-line and F-line, and nd is a refractive index of the positive lens GP for d-line.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: July 16, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shunji Iwamoto, Shinichiro Saito, Satoshi Maetaki, Takahiro Hatada, Suguru Inoue
  • Patent number: 10247926
    Abstract: An optical system includes an optical element. When the optical element is disposed on a magnification side with respect to an intersection point between an optical axis and a chief paraxial ray, the optical element is a positive lens. When the optical element is disposed on a reduction side with respect to the intersection point, the optical element is a negative lens. The optical element satisfies all of the following conditional expressions: 30??d?40 1.225?[nd?(14.387/?d)]?1.276 0.4300?[?gF?(2.9795/?d)]?0.5010 where ?d is Abbe number of the optical element, ?gF is a partial dispersion ratio of the optical element for g-line and F-line, and nd is a refractive index of the optical element for d-line.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: April 2, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shunji Iwamoto, Shinichiro Saito, Satoshi Maetaki, Takahiro Hatada, Suguru Inoue
  • Patent number: 10185059
    Abstract: An optical element, which is composed of at least three optical members including a resin layer sandwiched between two optical members, has a high environmental resistance and optical performance, and has an excellent chromatic aberration correction effect. In the optical element, the resin layer is formed on one of light incident/exit surfaces of a first optical member, and a second optical member is cemented to the resin layer by a bonding material. A condition of ?g<?r is satisfied, where ?r indicates an outer diameter of the resin layer and ?g indicates a diameter of cemented surface of the resin layer and the second optical member.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: January 22, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Satoshi Maetaki
  • Publication number: 20180095242
    Abstract: An optical system used in an imaging apparatus includes an optical element. In a case where the optical element is disposed on a magnification side with respect to an intersection point of an optical axis and a chief paraxial ray, the optical element is a negative lens, and in a case where the optical element is disposed on a reduction side with respect to the intersection point, the optical element is a positive lens. The optical element is configured to satisfy all of the following conditional expressions: 30??d?40 1.225?[nd?(14.387/?d)]?1.276 0.4300?[?gF?(2.9795/?d)]?0.5010, where ?d represents an Abbe number of the optical element, ?gF is a partial dispersion ratio of the optical element for g-line and F-line, and nd is a refractive index of the optical element for d-line.
    Type: Application
    Filed: September 18, 2017
    Publication date: April 5, 2018
    Inventors: Shunji Iwamoto, Shinichiro Saito, Satoshi Maetaki, Takahiro Hatada, Suguru Inoue
  • Publication number: 20180095256
    Abstract: An optical system includes a negative lens satisfying the following conditional expressions: 30??d?40, 1.225?[nd?(14.387/?d)]?1.276, and 0.4300?[?gF?(2.9795/?d)]?0.5010, where ?d is an Abbe number of the negative lens, ?gF is a partial dispersion ratio of the negative lens at a g-line and an F-line, and nd is a refractive index of the negative lens at a d-line.
    Type: Application
    Filed: September 18, 2017
    Publication date: April 5, 2018
    Inventors: Shunji Iwamoto, Shinichiro Saito, Satoshi Maetaki, Takahiro Hatada, Suguru Inoue
  • Publication number: 20180095255
    Abstract: A conversion lens having a negative refractive power includes a positive lens GP. The positive lens GP satisfies all the following conditional expressions: 30??d?40, 1.225?[nd?(14.387/?d)]?1.276, and 0.4300?[?gF?(2.9795/?d)]?0.5010, where ?d is an Abbe number of the positive lens GP, ?gF is a partial dispersion ratio of the positive lens GP for g-line and F-line, and nd is a refractive index of the positive lens GP for d-line.
    Type: Application
    Filed: September 18, 2017
    Publication date: April 5, 2018
    Inventors: Shunji Iwamoto, Shinichiro Saito, Satoshi Maetaki, Takahiro Hatada, Suguru Inoue
  • Publication number: 20180095254
    Abstract: An optical system includes an optical element. When the optical element is disposed on a magnification side with respect to an intersection point between an optical axis and a chief paraxial ray, the optical element is a positive lens. When the optical element is disposed on a reduction side with respect to the intersection point, the optical element is a negative lens. The optical element satisfies all of the following conditional expressions: 30??d?40 1.225?[nd?(14.387/?d)]?1.276 0.4300?[?gF?(2.9795/?d)]?0.5010 where ?d is Abbe number of the optical element, ?gF is a partial dispersion ratio of the optical element for g-line and F-line, and nd is a refractive index of the optical element for d-line.
    Type: Application
    Filed: September 18, 2017
    Publication date: April 5, 2018
    Inventors: Shunji Iwamoto, Shinichiro Saito, Satoshi Maetaki, Takahiro Hatada, Suguru Inoue
  • Publication number: 20180045930
    Abstract: Provided is a rear converter optical system which is detachably mounted on an image side of a main lens system to increase a focal length of the main lens system, in which an effective diameter ?im of an imaging area of the main lens system, an effective diameter ?cr of a lens surface closest to the image side of the rear converter optical system, a lateral magnification ?c of the rear converter optical system in the case where the rear converter optical system is mounted on the main lens system, a backfocus skc in the case where the rear converter optical system is mounted on the main lens system are appropriately set.
    Type: Application
    Filed: August 8, 2017
    Publication date: February 15, 2018
    Inventor: Satoshi Maetaki
  • Patent number: 9703112
    Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a rear unit including a plurality of lens units. A distance between adjacent lens units changes during zooming. An aperture stop is arranged on an image side of the first lens unit. An image stabilizing unit Ls comprising at least part of the second lens unit moves in a direction perpendicular to an optical axis during blurring correction. The predetermined conditional expressions are satisfied.
    Type: Grant
    Filed: October 8, 2013
    Date of Patent: July 11, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Satoshi Maetaki
  • Patent number: 9645370
    Abstract: A zoom lens has a first positive lens unit having a positive refractive power, a second positive lens unit arranged adjacent to the first positive lens unit on its image side, a third positive lens unit arranged adjacent to the second positive lens unit on its image side, and a front lens group arranged on the object side of the first positive lens unit. Appropriate conditions concerning the refractive power of the front lens group, the focal length of the second positive lens unit, and the focal length of the zoom lens at the wide angle end are given.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: May 9, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Satoshi Maetaki
  • Patent number: 9557543
    Abstract: Provided is a zoom lens including a plurality of lens units, in which an interval between adjacent lens units changes during zooming. The zoom lens includes: a first lens subunit having a positive refractive power; a second lens subunit having a positive refractive power, which is arranged adjacent to an image side of the first lens subunit; and at least one lens unit on an object side of the first lens subunit. Lens systems arranged on the object side of the first lens subunit have a negative combined focal length over an entire zoom range. The second lens subunit moves along an optical axis to the image side during focusing from an object at infinity to a proximate object. A focal length of the first lens subunit and a focal length of the second lens subunit are appropriately set.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: January 31, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Satoshi Maetaki
  • Publication number: 20160349492
    Abstract: A zoom lens has a first positive lens unit having a positive refractive power, a second positive lens unit arranged adjacent to the first positive lens unit on its image side, a third positive lens unit arranged adjacent to the second positive lens unit on its image side, and a front lens group arranged on the object side of the first positive lens unit. Appropriate conditions concerning the refractive power of the front lens group, the focal length of the second positive lens unit, and the focal length of the zoom lens at the wide angle end are given.
    Type: Application
    Filed: May 26, 2016
    Publication date: December 1, 2016
    Inventor: Satoshi Maetaki
  • Publication number: 20150234166
    Abstract: Provided is a zoom lens including a plurality of lens units, in which an interval between adjacent lens units changes during zooming. The zoom lens includes: a first lens subunit having a positive refractive power; a second lens subunit having a positive refractive power, which is arranged adjacent to an image side of the first lens subunit; and at least one lens unit on an object side of the first lens subunit. Lens systems arranged on the object side of the first lens subunit have a negative combined focal length over an entire zoom range. The second lens subunit moves along an optical axis to the image side during focusing from an object at infinity to a proximate object. A focal length of the first lens subunit and a focal length of the second lens subunit are appropriately set.
    Type: Application
    Filed: January 30, 2015
    Publication date: August 20, 2015
    Inventor: Satoshi Maetaki