Patents by Inventor Kenichi Kitano

Kenichi Kitano 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: 20220137325
    Abstract: A lens barrel and an imaging device which can be miniaturized, the lens barrel with a movable cylinder that moves along the optical axis with a change in focal length; first and second drive units in the movable cylinder; and first and second lens driven by the first and second drive units respectively to move along the optical axis relative to the movable cylinder. The movement amount of the first lens relative to the cylinder when the focal length is changed to a second focal length from a first state where the first lens is at a position closest to a subject with a first focal length is less than the movement amount of the first lens relative to the cylinder when the focal length is changed to the second focal length from a second state where the first lens is closer to an image plane than the first state.
    Type: Application
    Filed: December 18, 2019
    Publication date: May 5, 2022
    Applicant: NIKON CORPORATION
    Inventors: Osamu GOMIBUCHI, Makoto HORIKOSHI, Mizuki WAYU, Tsuneo WATANABE, Kenichi KITANO
  • Publication number: 20220026692
    Abstract: A zoom optical system (ZL) comprises a plurality of lens groups (G1-G7), and upon zooming distances between adjacent lens groups change. The zoom optical system comprises a focusing lens group (G5,G6) that moves upon focusing and an image-side lens group ((G7) disposed adjacent to an image side of the focusing lens group. The zoom optical system satisfies a following conditional expression. 0.000<dL0t/dL1t<1.000 where dL0t: a distance on an optical axis between the focusing lens group and the image-side lens group upon focusing on an infinity object in a telephoto end state, and dL1t: a distance on the optical axis between the focusing lens group and the image-side lens group upon focusing on a short-distance object in the telephoto end state.
    Type: Application
    Filed: December 26, 2018
    Publication date: January 27, 2022
    Inventors: Kosuke MACHIDA, Osamu GOMIBUCHI, Kenichi KITANO, Mizuki WAYU, Tsuneo WATANABE, Makoto HORIKOSHI, Ichiro IMAEI
  • Publication number: 20200225441
    Abstract: A lightweight lens barrel that includes two focus lenses. The first lens holding frame for holding a first lens L5, a first drive unit STM5 for causing the first lens holding frame to move in the optical axis direction, a second lens holding frame for holding a second lens L6, and a second drive unit STM6 for causing the second lens holding frame to move in the optical axis direction, the first lens holding frame being arranged on an inner peripheral side of the second lens holding frame.
    Type: Application
    Filed: August 7, 2018
    Publication date: July 16, 2020
    Applicant: NIKON CORPORATION
    Inventors: Takashi KISHIMOTO, Kenichi KITANO, Osamu GOMIBUCHI
  • Publication number: 20200218030
    Abstract: A lightweight lens barrel with two focus lenses; a first lens holding frame for holding a first lens, a first drive unit for causing the first lens holding frame to move in the optical axis direction, a second lens holding frame for holding a second lens, a second drive unit for causing the second lens holding frame to move in the optical axis direction, and a moving tube with the first driving unit and the second driving unit, and movable in the optical axis direction, wherein the first lens holding frame and the second lens holding frame are each movable in the optical axis direction with respect to the moving tube.
    Type: Application
    Filed: August 7, 2018
    Publication date: July 9, 2020
    Applicant: NIKON CORPORATION
    Inventors: Takashi KISHIMOTO, Osamu GOMIBUCHI, Kenichi KITANO
  • Patent number: 8754141
    Abstract: A method that produces heat-expandable microspheres includes the use of a shell of thermoplastic resin and a non-fluorine blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin. The method includes a step of dispersing an oily mixture containing a polymerizable component, the blowing agent, and a polymerization initiator containing a peroxydicarbonate in an aqueous dispersing medium to polymerize the polymerizable component contained in the oily mixture. The resultant heat-expandable microspheres have a shell which is less apt to become thinner than its theoretical value, contain minimum amount of resin particle inside their shell, and have excellent heat-expanding performance.
    Type: Grant
    Filed: October 9, 2012
    Date of Patent: June 17, 2014
    Assignee: Matsumoto Yushi-Seiyaku Co., Ltd.
    Inventors: Toshiaki Masuda, Kenichi Kitano, Katsushi Miki, Takeshi Inohara, Takayuki Aoki
  • Patent number: 8534333
    Abstract: A tread rubber is made of a rubber composition containing 100 pbw of a diene rubber, 30 to 100 pbw of a reinforcing filler including at least 10 pbw of silica, and 1 to 20 pbw of microcapsules each encapsulating a heat-expandable substance. A sulfur-containing silane coupling agent is mixed in the rubber composition in an amount of 3 to 15 wt. % based on the weight of the silica. A shell material of each microcapsule is made of a thermoplastic resin which essentially contains a nitrile monomer. A vapor pressure of the heat-expandable substance is 1.4 to 3.0 MPa at 150° C. An average diameter of the microcapsules is 20 to 30 ?m before vulcanization of the rubber composition. An average diameter of the microcapsules expanded due to the vulcanization is 40 to 80 ?m. The tread rubber has a proportion of a cell-occupying area of 5 to 30%.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: September 17, 2013
    Assignees: The Yokohama Rubber Co., Ltd., Matsumoto Yushi-Seiyaku Co., Ltd.
    Inventors: Takamasa Kitamura, Shigeki Ito, Kenichi Kitano, Takeshi Inohara
  • Patent number: 8486531
    Abstract: The present invention provides heat-expanded microspheres having high packing efficiency, and a production method thereof. The heat-expanded microspheres are produced by expanding heat-expandable microspheres, which comprise shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin and have an average particle size from 1 to 100 micrometer, at a temperature not lower than their expansion initiating temperature, and the heat-expanded microspheres result in a void fraction not higher than 0.70.
    Type: Grant
    Filed: January 23, 2012
    Date of Patent: July 16, 2013
    Assignee: Matsumoto Yushi-Seiyaku Co., Ltd.
    Inventors: Toshiaki Masuda, Ichiro Takahara, Kenichi Kitano, Katsushi Miki, Takeshi Inohara, Takayuki Aoki
  • Patent number: 8329298
    Abstract: A method that heat-expandable microspheres includes the use of a shell of thermoplastic resin and a non-fluorine blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin. The method includes, a step of dispersing an oily mixture containing a polymerizable component, the blowing agent, and a polymerization initiator containing a peroxydicarbonate in an aqueous dispersing medium to polymerize the polymerizable component contained in the oily mixture. The resultant heat-expandable microsphres have a shell which is less apt to become thinner than its theoretical value, contain minimum amount of resin particle inside their shell, and have excellent heat-expanding performance.
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: December 11, 2012
    Assignee: Matsumoto Yushi-Seiyaku Co., Ltd.
    Inventors: Toshiaki Masuda, Kenichi Kitano, Katsushi Miki, Takeshi Inohara, Takayuki Aoki
  • Patent number: 8324286
    Abstract: Heat-expandable microspheres include a shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin, have a maximum expanding ratio not lower than 50 times, and are thermally expanded into hollow particulates having a repeated-compression durability not lower than 75 percent. The method of producing the heat-expandable microspheres includes the steps of dispersing an oily mixture containing a polymerizable component and the blowing agent in an aqueous dispersing medium containing a specific water-soluble compound and polymerizing the polymerizable component contained in the oily mixture.
    Type: Grant
    Filed: November 16, 2006
    Date of Patent: December 4, 2012
    Assignee: Matsumoto Yushi-Seiyaku Co., Ltd.
    Inventors: Toshiaki Masuda, Ichiro Takahara, Kenichi Kitano, Katsushi Miki, Takeshi Inohara, Takeyoshi Fukuda, Takayuki Aoki, Satoshi Kawanami
  • Patent number: 8247465
    Abstract: Heat-expandable microspheres include a shell of thermoplastic resin and core material encapsulated in the shell. The core material include a blowing agent having a boiling point not higher than the softening point of the thermoplastic resin and a gas migration inhibitor having a boiling point higher than the softening point of the thermoplastic resin. The ratio of the gas migration inhibitor to the core material is at least 1 weight percent and below 30 weight percent. The average particle size of the heat-expandable microspheres ranges from 1 to 100 micrometers.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: August 21, 2012
    Assignee: Matsumoto Yushi-Seiyaku Co., Ltd.
    Inventors: Takeshi Inohara, Yoshiaki Shirakabe, Ikuo Yosejima, Kenichi Kitano, Toshiaki Masuda
  • Patent number: 8206826
    Abstract: A production method for heat-expandable microspheres, which have high expanding ratio and are thermally expanded into hollow particulates having excellent repeated-compression durability, and application thereof are provided. The method produces heat-expandable microspheres a shell of thermoplastic resin and a blowing agent being encapsulated therein and having a boiling point not higher than the softening point of the thermoplastic resin.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: June 26, 2012
    Assignee: Matsumoto Yushi-Seiyaku Co., Ltd.
    Inventors: Hiroki Naito, Satoshi Kawanami, Katsushi Miki, Ikuo Yosejima, Kenichi Kitano
  • Publication number: 20120121907
    Abstract: The present invention provides heat-expanded microspheres having high packing efficiency, and a production method thereof. The heat-expanded microspheres are produced by expanding heat-expandable microspheres, which comprise shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin and have an average particle size from 1 to 100 micrometer, at a temperature not lower than their expansion initiating temperature, and the heat-expanded microspheres result in a void fraction not higher than 0.70.
    Type: Application
    Filed: January 23, 2012
    Publication date: May 17, 2012
    Applicant: MATSUMOTO YUSHI-SEIYAKU CO., LTD.
    Inventors: Toshiaki MASUDA, Ichiro TAKAHARA, Kenichi KITANO, Katsushi MIKI, Takeshi INOHARA, Takayuki AOKI
  • Publication number: 20120080131
    Abstract: In heat-expandable microspheres as a starting material for hollow fine particles, which have excellent performances required for giving not only a durability in steady running region but also a durability in high-speed running region to a tire-rim assembly, and each consisting of an outer shell made of a thermoplastic resin obtained by polymerizing a monomer component in the presence of a polymerization initiator, and a foaming agent encapsulated in the outer shell and having a boiling point not higher than a softening point of the thermoplastic resin, the polymerization initiator comprises a peroxydicarbonate as an essential component, and the foaming agent comprises a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom.
    Type: Application
    Filed: November 21, 2011
    Publication date: April 5, 2012
    Applicants: MATSUMOTO YUSHI-SEIYAKU CO., LTD., BRIDGESTONE CORPORATION
    Inventors: Hiroyuki TERATANI, Toshiaki MASUDA, Kenichi KITANO, Katsushi MIKI, Takayuki AOKI, Takeshi INOHARA
  • Patent number: 8129020
    Abstract: Heat-expanded microspheres having high packing efficiency are produced by expanding heat-expandable microspheres, which include a shell of thermoplastic resin and a blowing agent encapsulated therein having a boiling point not higher than the softening point of the thermoplastic resin and have an average particle size from 1 to 100 micrometer, at a temperature not lower than their expansion initiating temperature, and the heat-expanded microspheres result in a void fraction not higher than 0.70.
    Type: Grant
    Filed: September 14, 2006
    Date of Patent: March 6, 2012
    Assignee: Matsumoto Yushi-Seiyaku Co., Ltd.
    Inventors: Toshiaki Masuda, Ichiro Takahara, Kenichi Kitano, Katsushi Miki, Takeshi Inohara, Takayuki Aoki
  • Patent number: 8073317
    Abstract: A positioning device comprising a moving portion provided with a pair of magnets arranged respectively along with a first axis and a second axis, a fixed portion provided to face to the moving portion, and a voice coil motor (VCM) for relatively driving the moving portion and the fixed portion by an electromagnetic action between a coil and a drive magnet provided to each of the moving portion and the fixed portion: wherein one of the magnets is arranged so as to reduce a rotation moment generated by an electromagnetic connection between the other magnet and the voice coil motor.
    Type: Grant
    Filed: June 15, 2007
    Date of Patent: December 6, 2011
    Assignee: Nikon Corporation
    Inventor: Kenichi Kitano
  • Patent number: 7902265
    Abstract: A rubber composition for a tire containing (i) 100 parts by weight of a diene-based rubber and (ii) 0.5 to 25 parts by weight of a heat-expandable microcapsule including a shell, and a substance capable of vaporizing or expanding under heating to thereby generate a gas and a nonpolar oil, both encapsulated in the shell, wherein the shell is made of a thermoplastic resin obtained by polymerization of a nitrile-based monomer (I), a monomer (II) having an unsaturated double bond and a carboxyl group in the molecule thereof, an optional monomer (III) having two or more polymerizable double bonds, and an optional copolymerizable monomer (IV) for adjusting the expansion properties.
    Type: Grant
    Filed: October 17, 2008
    Date of Patent: March 8, 2011
    Assignees: The Yokohama Rubber Co., Ltd., Matsumoto Yushi-Seiyaku Co., Ltd
    Inventors: Takamasa Kitamura, Makio Mori, Naoki Kushida, Toshiaki Masuda, Kenichi Kitano, Yoshiaki Shirakabe
  • Publication number: 20100288406
    Abstract: Provided is a pneumatic tire whose frictional force on ice is improved by satisfactorily forming resin-encapsulated cells from heat-expandable microcapsules, even when a tread rubber contains silica. The tire is characterized in that: the tread rubber is made of a rubber composition containing 100 parts by weight of a diene rubber, 30 to 100 parts by weight of a reinforcing filler including at least 10 parts by weight of silica, and 1 to 20 parts by weight of microcapsules each encapsulating a heat-expandable substance; a sulfur-containing silane coupling agent is mixed in the rubber composition in an amount of 3 to 15 wt. % based on the weight of the silica; a shell material of each microcapsule is made of a thermoplastic resin which essentially contains a nitrile monomer (I); a vapor pressure of the heat-expandable substance is set at 1.4 to 3.0 MPa at 150° C.
    Type: Application
    Filed: February 13, 2009
    Publication date: November 18, 2010
    Applicants: THE YOKOHAMA RUBBER CO., LTD., MATSUMOTO YUSHI-SEIYAKU CO., LTD.
    Inventors: Takamasa Kitamura, Shigeki Ito, Kenichi Kitano, Takeshi Inohara
  • Patent number: 7781534
    Abstract: The present invention provides: a process for preparing a vinyl polymer containing a halogen in an amount of 1,000 mg or less per kilogram, in which a vinyl polymer containing the halogen produced by atom transfer radical polymerization of a vinyl monomer is heated at a temperature in the range of 140 to 250° C. to dehalogenate the vinyl polymer; a vinyl polymer obtained by the process; and a hydrosilylation-reactive curable composition containing the vinyl polymer.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: August 24, 2010
    Assignee: Kaneka Corporation
    Inventors: Kenichi Kitano, Akihisa Hirota, Masanao Takeda, Kosuke Tanaka, Yoshiki Nakagawa, Shigeru Hagimori, Naoki Furukawa, Shigeki Ono, Nao Fujita
  • Publication number: 20100204349
    Abstract: Heat-expandable microspheres include a shell of thermoplastic resin and core material encapsulated in the shell. The core material include a blowing agent having a boiling point not higher than the softening point of the thermoplastic resin and a gas migration inhibitor having a boiling point higher than the softening point of the thermoplastic resin. The ratio of the gas migration inhibitor to the core material is at least 1 weight percent and below 30 weight percent. The average particle size of the heat-expandable microspheres ranges from 1 to 100 micrometers.
    Type: Application
    Filed: October 9, 2008
    Publication date: August 12, 2010
    Applicant: MATSUMOTO YUSHI-SEIYAKU CO., LTD.
    Inventors: Takeshi Inohara, Yoshiaki Shirakabe, Ikuo Yosejima, Kenichi Kitano, Toshiaki Masuda
  • Publication number: 20100180995
    Abstract: In heat-expandable microspheres as a starting material for hollow fine particles, which have excellent performances required for giving not only a durability in steady running region but also a durability in high-speed running region to a tire-rim assembly, and each consisting of an outer shell made of a thermoplastic resin obtained by polymerizing a monomer component in the presence of a polymerization initiator, and a foaming agent encapsulated in the outer shell and having a boiling point not higher than a softening point of the thermoplastic resin, the polymerization initiator comprises a peroxydicarbonate as an essential component, and the foaming agent comprises a fluorine-containing compound having an ether structure and a carbon number of 2-10 and containing no chlorine atom and bromine atom.
    Type: Application
    Filed: October 24, 2006
    Publication date: July 22, 2010
    Inventors: Hiroyuki Teratani, Toshiaki Masuda, Kenichi Kitano, Katsushi Miki, Takayuki Aoki, Takeshi Inohara