Patents by Inventor Seiichi Isojima

Seiichi Isojima 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: 20210118589
    Abstract: An electroconductive film which is capable of inhibiting milkiness; and a touch panel and image display device that include the electroconductive film are provided. According to one aspect of the present invention, an electroconductive film 10 including at least an electroconductive part 12, wherein the electroconductive part 12 includes a light-transmitting resin 14 and a plurality of electroconductive fibers 15 placed in the light-transmitting resin 14, and the diffused light reflectance (SCE) in a region of the electroconductive film 10 where the electroconductive part 12 is present is 0.5% or less, is provided.
    Type: Application
    Filed: March 8, 2019
    Publication date: April 22, 2021
    Inventors: Eiji OOISHI, Shoichiro OGUMI, Yukimitsu IWATA, Takashi TAKEKOSHI, Seiichi ISOJIMA
  • Patent number: 10935700
    Abstract: One aspect of the present invention provides a foldable light-transmitting optical film 10 for use in an image display device 50, which includes a resin base material 11, a hard coat layer 12 provided on the first surface 11A of the resin base material 11, and a resin layer 13 having a film thickness of 50 ?m or more and 300 ?m or less and provided on the second surface 11B of the resin base material 11 that is opposite to the first surface 11A, wherein the shear storage modulus (G?) of the optical film 10 at 25° C. in the frequency range from 500 Hz to 1000 Hz inclusive is more than 200 MPa and 1200 MPa or less, and the shear loss modulus (G?) of the optical film at 25° C. in the frequency range from 500 Hz to 1000 Hz inclusive is 3 MPa or more and 150 MPa or less.
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: March 2, 2021
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Yusuke Hashimoto, Atsuhiro Kobayashi, Seiichi Isojima
  • Patent number: 10921648
    Abstract: The present invention aims to provide a liquid crystal display device highly suppressing occurrence of rainbow interference pattern in displayed images. The present invention is a liquid crystal display device including: a back light source, a liquid crystal cell, a color filter, a polarizer, and a polarizer protective film arranged in the stated order, wherein the polarizer protective film has a retardation of not less than 6000 nm, and a difference (nx?ny) of not less than 0.05 between a refractive index (nx) in a slow axis direction that is a highest refractive index direction and a refractive index (ny) in a fast axis direction that is orthogonal to the slow axis direction, and an absorption axis of the polarizer and the slow axis of the polarizer protective film are arranged to form an angle within a range of 0°±30° or 90°±30°.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: February 16, 2021
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Takashi Kuroda, Seiichi Isojima, Norinaga Nakamura
  • Publication number: 20200386917
    Abstract: One aspect of the present invention provides a foldable light-transmitting optical film 10 for use in an image display device 50, which includes a resin base material 11, a hard coat layer 12 provided on the first surface 11A of the resin base material 11, and a resin layer 13 having a film thickness of 50 ?m or more and 300 ?m or less and provided on the second surface 11B of the resin base material 11 that is opposite to the first surface 11A, wherein the shear storage modulus (G?) of the optical film 10 at 25° C. in the frequency range from 500 Hz to 1000 Hz inclusive is more than 200 MPa and 1200 MPa or less, and the shear loss modulus (G?) of the optical film at 25° C. in the frequency range from 500 Hz to 1000 Hz inclusive is 3 MPa or more and 150 MPa or less.
    Type: Application
    Filed: December 28, 2017
    Publication date: December 10, 2020
    Inventors: Yusuke HASHIMOTO, Atsuhiro KOBAYASHI, Seiichi ISOJIMA
  • Patent number: 10792901
    Abstract: One aspect of the present invention provides a foldable light-transmitting optical film 10 for use in an image display device, comprising a resin base material 11 and a resin layer 12 provided on one surface 11A of the resin base material 11, wherein the shear storage elastic modulus (G?) of the optical film 10 at 25° C. in the frequency range from 500 Hz to 1000 Hz inclusive is 1 MPa or more and 200 MPa or less, and the shear loss elastic modulus (G?) of the optical film 10 at 25° C. in the frequency range from 500 Hz to 1000 Hz inclusive is 0.1 MPa or more and 100 MPa or less.
    Type: Grant
    Filed: August 31, 2017
    Date of Patent: October 6, 2020
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Seiichi Isojima, Yusuke Hashimoto, Jun Sato
  • Patent number: 10668690
    Abstract: The present invention provides: an optical laminate comprising at least two films, the optical laminate comprising at least a film A satisfying a given condition (1) and a film C satisfying a given condition (2), wherein a retardation value Re(0) observed in a direction of an axis perpendicular to a plane of the optical laminate is 4,000 to 30,000 nm, and a retardation value Re(40) observed in a direction of an axis tilted from the axis perpendicular to the plane of the optical laminate toward a slow axis by 40 degrees in a plane lying perpendicular to the plane of the optical laminate and extending along the slow axis is 4,000 to 25,000 nm, the slow axis being an axis along which refractive index is highest in a plane of the film A; and a display device comprising the optical laminate.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: June 2, 2020
    Assignees: DAI NIPPON PRINTING CO., LTD.
    Inventors: Seiichi Isojima, Takashi Kuroda
  • Publication number: 20190315105
    Abstract: One aspect of the present invention provides a foldable light-transmitting optical film 10 for use in an image display device, comprising a resin base material 11 and a resin layer 12 provided on one surface 11A of the resin base material 11, wherein the shear storage elastic modulus (G?) of the optical film 10 at 25° C. in the frequency range from 500 Hz to 1000 Hz inclusive is 1 MPa or more and 200 MPa or less, and the shear loss elastic modulus (G?) of the optical film 10 at 25° C. in the frequency range from 500 Hz to 1000 Hz inclusive is 0.1 MPa or more and 100 MPa or less.
    Type: Application
    Filed: August 31, 2017
    Publication date: October 17, 2019
    Inventors: Seiichi ISOJIMA, Yusuke HASHIMOTO, Jun Sato
  • Publication number: 20190255807
    Abstract: The present invention provides: an optical laminate comprising at least two films, the optical laminate comprising at least a film A satisfying a given condition (1) and a film C satisfying a given condition (2), wherein a retardation value Re(0) observed in a direction of an axis perpendicular to a plane of the optical laminate is 4,000 to 30,000 nm, and a retardation value Re(40) observed in a direction of an axis tilted from the axis perpendicular to the plane of the optical laminate toward a slow axis by 40 degrees in a plane lying perpendicular to the plane of the optical laminate and extending along the slow axis is 4,000 to 25,000 nm, the slow axis being an axis along which refractive index is highest in a plane of the film A; and a display device comprising the optical laminate.
    Type: Application
    Filed: June 30, 2017
    Publication date: August 22, 2019
    Applicants: DAI NIPPON PRINTING CO., LTD.
    Inventors: Seiichi ISOJIMA, Takashi KURODA
  • Patent number: 10353246
    Abstract: The present invention aims to provide a liquid crystal display device highly suppressing occurrence of rainbow interference pattern in displayed images. The present invention is a liquid crystal display device including: a back light source, a liquid crystal cell, a color filter, a polarizer, and a polarizer protective film arranged in the stated order, wherein the polarizer protective film has a retardation of not less than 6000 nm, and a difference (nx?ny) of not less than 0.05 between a refractive index (nx) in a slow axis direction that is a highest refractive index direction and a refractive index (ny) in a fast axis direction that is orthogonal to the slow axis direction, and an absorption axis of the polarizer and the slow axis of the polarizer protective film are arranged to form an angle within a range of 0°±30° or 90°±30°.
    Type: Grant
    Filed: January 7, 2016
    Date of Patent: July 16, 2019
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Takashi Kuroda, Seiichi Isojima, Norinaga Nakamura
  • Publication number: 20180224702
    Abstract: The present invention aims to provide a liquid crystal display device highly suppressing occurrence of rainbow interference pattern in displayed images. The present invention is a liquid crystal display device including: a back light source, a liquid crystal cell, a color filter, a polarizer, and a polarizer protective film arranged in the stated order, wherein the polarizer protective film has a retardation of not less than 6000 nm, and a difference (nx?ny) of not less than 0.05 between a refractive index (nx) in a slow axis direction that is a highest refractive index direction and a refractive index (ny) in a fast axis direction that is orthogonal to the slow axis direction, and an absorption axis of the polarizer and the slow axis of the polarizer protective film are arranged to form an angle within a range of 0°±30° or 90°±30°.
    Type: Application
    Filed: April 3, 2018
    Publication date: August 9, 2018
    Inventors: Takashi KURODA, Seiichi ISOJIMA, Norinaga NAKAMURA
  • Patent number: 9541682
    Abstract: The present invention provides a display device having excellent light energy conversion efficiency. The present invention relates to a display device including a light-diffusing layered body. The light-diffusing layered body includes a wavelength conversion layer containing optically isotropic semiconductor particles and a light-diffusing layer on at least one surface of the wavelength conversion layer. The light-diffusing layer contains a binder component and light-diffusing particles that contain an organic material or an inorganic material. The light-diffusing particles protrude in a range of 3 to 50% of the particle size of the light-diffusing particles from an outermost surface of the light-diffusing layer. The light-diffusing layer has projections and depressions on the outermost surface due to the light-diffusing particles protruding therefrom. The light-diffusing layer has a film thickness of 1 to 30 ?m.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: January 10, 2017
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Seiichi Isojima, Hiroshi Kojima, Hiroki Nakagawa
  • Publication number: 20160116802
    Abstract: The present invention aims to provide a liquid crystal display device highly suppressing occurrence of rainbow interference pattern in displayed images. The present invention is a liquid crystal display device including: a back light source, a liquid crystal cell, a color filter, a polarizer, and a polarizer protective film arranged in the stated order, wherein the polarizer protective film has a retardation of not less than 6000 nm, and a difference (nx?ny) of not less than 0.05 between a refractive index (nx) in a slow axis direction that is a highest refractive index direction and a refractive index (ny) in a fast axis direction that is orthogonal to the slow axis direction, and an absorption axis of the polarizer and the slow axis of the polarizer protective film are arranged to form an angle within a range of 0°±30° or 90°±30°.
    Type: Application
    Filed: January 7, 2016
    Publication date: April 28, 2016
    Inventors: Takashi Kuroda, Seiichi Isojima, Norinaga Nakamura
  • Patent number: 9297933
    Abstract: Provided is an antiglare film having a hard coat property, capable of highly suppressing generation of a rainbow interference pattern and interference fringes in display images, preventing white muddiness and scintillation of a display screen, while giving high contrast in a bright room and a dark room. The antiglare film includes an antiglare layer having an uneven form on its surface and formed on one face of a transparent substrate having an in-plane birefringence and a retardation of 3000 nm or higher. The antiglare layer contains silica fine particles, organic fine particles, and a binder resin. The silica particles include particles forming agglomerates to be contained coarsely and densely in the antiglare layer. The agglomerates are distributed densely around the organic fine particles, and some agglomerates adhere to surfaces of the organic particles and/or some silica particles are impregnated in the inside of the organic particles.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: March 29, 2016
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Takashi Kuroda, Seiichi Isojima, Makoto Honda, Gen Furui, Junya Eguchi, Eiji Ooishi
  • Publication number: 20160054486
    Abstract: The present invention provides a display device having excellent light energy conversion efficiency. The present invention relates to a display device including a light-diffusing layered body. The light-diffusing layered body includes a wavelength conversion layer containing optically isotropic semiconductor particles and a light-diffusing layer on at least one surface of the wavelength conversion layer. The light-diffusing layer contains a binder component and light-diffusing particles that contain an organic material or an inorganic material. The light-diffusing particles protrude in a range of 3 to 50% of the particle size of the light-diffusing particles from an outermost surface of the light-diffusing layer. The light-diffusing layer has projections and depressions on the outermost surface due to the light-diffusing particles protruding therefrom. The light-diffusing layer has a film thickness of 1 to 30 ?m.
    Type: Application
    Filed: August 21, 2015
    Publication date: February 25, 2016
    Inventors: Seiichi ISOJIMA, Hiroshi KOJIMA, Hiroki NAKAGAWA
  • Patent number: 9261728
    Abstract: The present invention aims to provide a liquid crystal display device highly suppressing occurrence of rainbow interference pattern in displayed images. The present invention is a liquid crystal display device including: a back light source, a liquid crystal cell, a color filter, a polarizer, and a polarizer protective film arranged in the stated order, wherein the polarizer protective film has a retardation of not less than 6000 nm, and a difference (nx?ny) of not less than 0.05 between a refractive index (nx) in a slow axis direction that is a highest refractive index direction and a refractive index (ny) in a fast axis direction that is orthogonal to the slow axis direction, and an absorption axis of the polarizer and the slow axis of the polarizer protective film are arranged to form an angle within a range of 0°±30° or 90°±30°.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: February 16, 2016
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Takashi Kuroda, Seiichi Isojima, Norinaga Nakamura
  • Publication number: 20150004397
    Abstract: Provided is an optical layered body which is extremely high in the stability of the antistatic performance, and has a stable surface resistance even after a durability test. The optical layered body includes an antistatic layer on one face of a light-transmitting substrate, wherein the antistatic layer is formed using a composition for an antistatic layer containing conductive fine particles, a resin component, and a solvent, and the resin component has no reactive functional groups in a molecule, and is soluble in the solvent and compatible with the conductive fine particles.
    Type: Application
    Filed: December 14, 2012
    Publication date: January 1, 2015
    Inventors: Tomoyuki Horio, Masayuki Tsunekawa, Seiichi Isojima, Kana Yamamoto
  • Patent number: 8692959
    Abstract: Provided is an optical layered body that includes a polyester base, a primer layer formed thereon, and a hard coat layer formed on the primer. The polyester has a retardation of not less than 8000 nm, and a difference (nx?ny) of 0.07 to 0.20 between a refractive index (nx) in a slow axis direction that is a high refractive index direction and a refractive index (ny) of a fast axis direction that is orthogonal to the slow axis direction, a refractive index (np) of the primer, the refractive index (nx) in the slow axis direction of the polyester, and the refractive index (ny) in the fast axis direction of the polyester satisfy ny<np<nx, and a refractive index (nh) of the hard coat, the refractive index (nx) in the slow axis direction of the polyester, and the refractive index (ny) in the fast axis direction of the polyester satisfy ny<nh<nx.
    Type: Grant
    Filed: January 16, 2013
    Date of Patent: April 8, 2014
    Assignee: Dai Nippon Printing Co., Ltd.
    Inventors: Seiji Shinohara, Seiichi Isojima, Hiroki Nakagawa, Gen Furui
  • Publication number: 20130279155
    Abstract: Provided is an antiglare film having a hard coat property, capable of highly suppressing generation of a rainbow interference pattern and interference fringes in display images, preventing white muddiness and scintillation of a display screen, while giving high contrast in a bright room and a dark room. The antiglare film includes an antiglare layer having an uneven form on its surface and formed on one face of a transparent substrate having an in-plane birefringence and a retardation of 3000 nm or higher. The antiglare layer contains silica fine particles, organic fine particles, and a binder resin. The silica particles include particles forming agglomerates to be contained coarsely and densely in the antiglare layer. The agglomerates are distributed densely around the organic fine particles, and some agglomerates adhere to surfaces of the organic particles and/or some silica particles are impregnated in the inside of the organic particles.
    Type: Application
    Filed: December 4, 2012
    Publication date: October 24, 2013
    Applicant: Dai Nippon Printing Co., Ltd.
    Inventors: Takashi Kuroda, Seiichi Isojima, Makoto Honda, Gen Furui, Junya Eguchi, Eiji Ooishi