Patents by Inventor Hitoshi Hirano

Hitoshi Hirano 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: 20190285844
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens having positive refractive power; and a sixth lens having negative refractive power, arranged in this order from an object side to an image plane side. The first lens is formed in a shape so that surfaces on the object side and the image plane side are convex near an optical axis. The second lens is formed in a meniscus shape near an optical axis. The fifth lens is formed in a shape so that surfaces on the object side and the image plane side are convex near an optical axis. The sixth lens is formed in a shape so that surfaces on the object side and the image plane side are concave near an optical axis. The first lens has a specific Abbe's number.
    Type: Application
    Filed: May 31, 2019
    Publication date: September 19, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Yoshio ISE, Sayuri NODA
  • Publication number: 20190285845
    Abstract: An imaging lens includes a stop; a first lens; a second lens; a third lens having positive refractive power; a fourth lens; a fifth lens having positive refractive power; and a sixth lens, arranged in this order from an object side to an image plane side. The fourth lens is formed in a shape so that a surface thereof on the image plane side is convex near an optical axis thereof. The sixth lens is formed in a shape so that a surface thereof on the image plane side is concave near an optical axis thereof. The second lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side have specific curvature radii.
    Type: Application
    Filed: May 31, 2019
    Publication date: September 19, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Yoshio ISE, Sayuri NODA
  • Publication number: 20190285846
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens having positive refractive power; and a sixth lens having negative refractive power, arranged from an object side to an image plane side. The fourth lens is formed in a shape so that a surface on the object side is concave and a surface on the image plane side is convex near an optical axis. The fifth lens is formed in a shape so that surfaces on the object side and the image plane side are convex near an optical axis. The sixth lens is formed in a shape so that surfaces on the object side and the image plane side are concave near an optical axis. The fifth lens and the sixth lens have specific focal lengths, and the fourth lens has a specific Abbe's number.
    Type: Application
    Filed: May 31, 2019
    Publication date: September 19, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Yoshio ISE, Sayuri NODA
  • Publication number: 20190278057
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens having positive refractive power; and a sixth lens, arranged in this order from an object side to an image plane side. The second lens is formed in a shape so that a surface thereof on the object side is convex near an optical axis thereof. The fourth lens is formed in a shape so that a surface thereof on the image plane side is convex near an optical axis thereof. The fifth lens is formed in a shape so that a surface thereof on the object side is convex near an optical axis thereof. The sixth lens is formed in a shape so that a surface thereof on the image plane side is concave toward the image plane side near an optical axis thereof.
    Type: Application
    Filed: May 31, 2019
    Publication date: September 12, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Yoshio ISE, Sayuri NODA
  • Patent number: 10386600
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side. The second lens is formed in a meniscus shape. The fourth lens is formed in a shape so that a surface thereof on the image plane side is convex toward the image plane side. The fifth lens is formed in a shape so that a surface thereof on the object side is convex toward the object side, and a surface thereof on the image plane side is convex toward the image plane side. The sixth lens is formed in a shape so that a surface thereof on the image plane side is concave toward the image plane side.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: August 20, 2019
    Assignee: Kantatsu Co., Ltd.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Yoshio Ise, Sayuri Noda
  • Patent number: 10371925
    Abstract: An imaging lens includes a first lens group; a second lens group; and a third lens group. The first lens group includes a first lens, a second lens having negative refractive power, and a third lens. The second lens group includes a fourth lens and a fifth lens. The third lens group includes a sixth lens and a seventh lens. The first to seventh lenses are arranged on an optical axis with a space in between respectively. The first lens is formed in a meniscus shape. The third lens has a surface on an image plane side having a positive curvature radius. The fourth lens has a surface on the image plane side having a negative curvature radius. The sixth lens is formed in a meniscus shape. The seventh lens has a surface on the image plane side having a positive curvature radius and formed in an aspheric shape.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: August 6, 2019
    Assignee: KANTATSU CO., LTD.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Tomohiro Yonezawa
  • Patent number: 10345557
    Abstract: An imaging lens includes a first lens group and a second lens group arranged in this order from an object side to an image plane side. The first lens group includes a first lens having positive refractive power, a second lens having negative refractive power, and a third lens, arranged with a space in between. The second lens group includes a front side lens group having negative refractive power and a rear side lens group having positive refractive power. The front side lens group includes a fourth lens and a fifth lens arranged with a space in between. The rear side lens group includes a sixth lens and a seventh lens arranged with a space in between. The fourth lens is formed in a shape so that a surface thereof on the object side has a specific curvature radius so that a specific conditional expression is satisfied.
    Type: Grant
    Filed: August 24, 2017
    Date of Patent: July 9, 2019
    Assignee: KANTATSU CO., LTD.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Hisao Fukaya
  • Patent number: 10338343
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side. The fourth lens is formed in a shape so that a surface thereof on the image plane side is convex on an optical axis thereof. The sixth lens is formed in a shape so that a surface thereof on the image plane side is concave toward the image plane side near an optical axis thereof. The fifth lens has a specific Abbe's number and the third lens has a specific focal length.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: July 2, 2019
    Assignee: KANTATSU CO., LTD.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Yoshio Ise, Sayuri Noda
  • Patent number: 10338349
    Abstract: An imaging lens includes a first lens group and a second lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a fourth lens, a fifth lens having negative refractive power, and a sixth lens having positive refractive power. The first lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side have positive curvature radii. The sixth lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side are aspheric. The sixth lens has a specific Abbe's number.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: July 2, 2019
    Assignee: KANTATSU CO., LTD.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Hisao Fukaya
  • Publication number: 20190196154
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens having positive refractive power; a fifth lens; a sixth lens; and a seventh lens, arranged in this order from an object side to an image plane side. The sixth lens is formed in a shape so that a surface thereof on the image plane side has a positive curvature radius. The seventh lens is formed in a shape so that a surface thereof on the image plane side and a surface thereof on the object side are aspheric. The imaging lens has a specific angle of view.
    Type: Application
    Filed: March 4, 2019
    Publication date: June 27, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Tomohiro YONEZAWA
  • Publication number: 20190196155
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and a seventh lens, arranged in this order from an object side to an image plane side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged respectively with a space in between. The fifth lens is formed in a shape so that a surface thereof on the image plane side has a positive curvature radius. The seventh lens is formed in a shape so that a surface thereof on the image plane side and a surface thereof on the object side are aspheric.
    Type: Application
    Filed: March 4, 2019
    Publication date: June 27, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Tomohiro YONEZAWA
  • Publication number: 20190193454
    Abstract: To provide a writing instrument capable of further improving durability of a writing nib without impairing writing performance even when writing is performed with a heavy writing load. A writing instrument A having a writing part formed of at least a writing nib 30 made of a porous body and a retainer 40 made of a hard material, in which the protrusion amount of the distal end of the writing nib 30 from the retainer 40 is 0.65 mm or more and 1.05 mm or less and/or 40% or more and 65% or less of the thickness of the writing nib 30.
    Type: Application
    Filed: August 24, 2017
    Publication date: June 27, 2019
    Inventors: Hitoshi SUZUKI, Kouichi HIRANO, Yukinori SAWA, Toshimi KAMITANI
  • Patent number: 10330893
    Abstract: An imaging lens includes an aperture stop; a first lens having positive refractive power; a second lens having negative refractive power; a third lens; a fourth lens; a fifth lens having negative refractive power; and a sixth lens, arranged in this order from an object side to an image plane side. A surface of the first lens on the image plane side has a positive curvature radius. A surface of the third lens on the image plane side has a positive curvature radius. A surface of the fifth lens on the object side and a surface of the fifth lens on the image plane side have inflection points and are aspheric. A surface of the sixth lens on the object side has a positive curvature radius. The first to the third lenses have specific thicknesses so that specific conditional expressions are satisfied.
    Type: Grant
    Filed: October 26, 2017
    Date of Patent: June 25, 2019
    Assignee: KANTATSU CO., LTD.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Hisao Fukaya
  • Publication number: 20190179118
    Abstract: An imaging lens includes a first lens having negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens; and a sixth lens having negative refractive power, arranged in this order from an object side to an image plane side. The fourth lens is disposed to face the fifth lens. The fourth lens is formed in a shape so that a surface thereof on the image plane side is concave at a peripheral portion thereof. The fifth lens is formed in a shape so that a surface thereof on the object side is concave at a peripheral portion thereof.
    Type: Application
    Filed: October 19, 2018
    Publication date: June 13, 2019
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Hisao Fukaya
  • Publication number: 20190179119
    Abstract: An imaging lens includes a first lens having negative refractive power; a second lens having positive refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens; and a sixth lens having negative refractive power, arranged in this order from an object side to an image plane side. The fourth lens is formed in a shape so that a surface thereof on the image plane side is convex near an optical axis thereof.
    Type: Application
    Filed: October 19, 2018
    Publication date: June 13, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Hisao FUKAYA
  • Patent number: 10302913
    Abstract: An imaging lens includes a first lens group; a second lens group; and a third lens group, arranged in this order from an object side to an image plane side. The first lens group includes a first lens, a second lens, and a third lens. The second lens group includes a fourth lens and a fifth lens having negative refractive power. The third lens group includes a sixth lens having negative refractive power and a seventh lens.
    Type: Grant
    Filed: July 24, 2017
    Date of Patent: May 28, 2019
    Assignee: KANTATSU CO., LTD.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Tomohiro Yonezawa
  • Publication number: 20190154994
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens having positive refractive power; a third lens; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side with spaces in between each of the lenses. The first lens is formed in a meniscus shape to have an object side convex surface. The sixth lens is formed in a meniscus shape to have an object side concave surface. The second lens has a specific focal length. The third lens has a specific focal length. The sixth lens has a specific Abbe's number.
    Type: Application
    Filed: January 18, 2019
    Publication date: May 23, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Hisao FUKAYA
  • Publication number: 20190146193
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens having negative refractive power; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side with spaces in between each of the lenses. The first lens is formed in a meniscus shape to have an object side convex surface. The third lens is formed in a meniscus shape. The fourth lens has an object side concave surface. The fifth lens has two aspheric surfaces. The sixth lens has two aspheric surfaces and the image plane side convex surface. The fifth lens has a specific thickness, and the sixth lens has a specific thickness. The fourth lens has a specific Abbe's number. The fifth lens has a specific Abbe's number.
    Type: Application
    Filed: January 17, 2019
    Publication date: May 16, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Hisao FUKAYA
  • Publication number: 20190146192
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens having positive refractive power; and a sixth lens, arranged in this order from an object side to an image plane side with spaces in between each of the lenses. The first lens is formed in a meniscus shape to have an object side convex surface. The second lens is formed in a meniscus shape. The third lens has at least one aspheric surface. The fourth lens has at least one aspheric surface and an object side concave surface. The fifth lens has two aspheric surfaces. The sixth lens has two aspheric surfaces and the image plane side convex surface. The fourth lens is arranged to be away from the fifth lens by a specific distance. The fourth lens has a specific Abbe's number.
    Type: Application
    Filed: January 17, 2019
    Publication date: May 16, 2019
    Inventors: Yoji KUBOTA, Kenichi KUBOTA, Hitoshi HIRANO, Hisao FUKAYA
  • Patent number: 10288839
    Abstract: An imaging lens includes a first lens having positive refractive power; a second lens; a third lens; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side. The second lens is formed in a shape so that an entire surface thereof on the object side is convex. The fifth lens is formed in a shape so that a surface thereof on the object side is convex toward the object side near an optical axis thereof, and a surface thereof on the image plane side is convex toward the image plane side near the optical axis thereof. The fourth lens has a specific Abbe's number.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: May 14, 2019
    Assignee: Kantatsu Co., Ltd.
    Inventors: Yoji Kubota, Kenichi Kubota, Hitoshi Hirano, Yoshio Ise, Sayuri Noda