Patents by Inventor Koki Hozumi

Koki Hozumi 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: 9304298
    Abstract: A zoom lens includes a first positive lens unit, a first negative lens unit, a stop, and a second positive lens unit, and at the time of zooming, the first positive lens unit is stationary, the first negative lens unit and the second positive lens unit move, and at the time of focusing, the first positive lens unit is stationary, and the first positive lens unit includes a reflecting member and a first positive lens unit object-side system, and the first positive lens unit-object side system is positioned on the object side of the reflecting member, and has a negative refractive power, and the following conditional expressions are satisfied. 3.7<ft/fw 1.55<|D1N/D2P|<2.5 1.75<|f2P/D2P|<2.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: April 5, 2016
    Assignee: OLYMPUS CORPORATION
    Inventors: Koji Nakagawa, Koki Hozumi, Akiko Naito, Takeshi Hosoya
  • Publication number: 20140267877
    Abstract: A zoom lens includes a first positive lens unit, a first negative lens unit, a stop, and a second positive lens unit, and at the time of zooming, the first positive lens unit is stationary, the first negative lens unit and the second positive lens unit move, and at the time of focusing, the first positive lens unit is stationary, and the first positive lens unit includes a reflecting member and a first positive lens unit object-side system, and the first positive lens unit-object side system is positioned on the object side of the reflecting member, and has a negative refractive power, and the following conditional expressions are satisfied. 3.7<ft/fw 1.55<|D1N/D2P|<2.5 1.75<|f2P/D2P|<2.
    Type: Application
    Filed: March 13, 2014
    Publication date: September 18, 2014
    Applicants: OLYMPUS CORPORATION, OLYMPUS IMAGING CORP.
    Inventors: Koji Nakagawa, Koki Hozumi, Akiko Naito, Takeshi Hosoya
  • Patent number: 8564711
    Abstract: A zoom lens includes a first lens group of positive refractive power; a second lens group of negative power; a third lens group of positive power; a fourth lens group of negative power, and a fifth lens group of positive power arranged from the object side to the image side. At activation of variable power from the wide angle end to the telescopic end, the first, third, fourth and fifth lens groups moves so as to get closer to the object side or the image side at the telescopic end than at the wide angle end; and a gap between the first lens group and the second lens group increases; a gap between the second lens group and the third lens group decreases; a gap between the third lens group and the forth lens group increases; and a gap between the forth lens group and the fifth lens group increases.
    Type: Grant
    Filed: January 24, 2012
    Date of Patent: October 22, 2013
    Assignee: Olympus Imaging Corp.
    Inventors: Masaru Morooka, Kazuteru Kawamura, Koki Hozumi, Hideyuki Nagaoka, Koji Nakagawa
  • Publication number: 20120194730
    Abstract: A zoom lens includes a first lens group of positive refractive power; a second lens group of negative power; a third lens group of positive power; a fourth lens group of negative power, and a fifth lens group of positive power arranged from the object side to the image side. At activation of variable power from the wide angle end to the telescopic end, the first, third, fourth and fifth lens groups moves so as to get closer to the object side or the image side at the telescopic end than at the wide angle end; and a gap between the first lens group and the second lens group increases; a gap between the second lens group and the third lens group decreases; a gap between the third lens group and the forth lens group increases; and a gap between the forth lens group and the fifth lens group increases.
    Type: Application
    Filed: January 24, 2012
    Publication date: August 2, 2012
    Inventors: Masaru MOROOKA, Kazuteru Kawamura, Koki Hozumi, Hideyuki Nagaoka, Koji Nakagawa