Patents by Inventor Takahiro Yoshikawa

Takahiro Yoshikawa 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: 20230358942
    Abstract: A lighting device that can ensure task productivity while reducing the glare is provided herein. The lighting device has a light source; and a light guiding part including a light guiding panel and configured to guide light that is emitted from the light source. The light guiding panel includes: a light incident end surface that is situated facing the light source, the light incident end surface being a surface on which the light emitted from the light source is incident; a first light emitting part that is included in an opposite end from the light incident end surface, and that emits the light guided inside the light guiding panel; and a second light emitting part that is included in a predetermined main surface of the light guiding panel that intersects with the light incident end surface, and that emits the light guided inside the light guiding panel.
    Type: Application
    Filed: July 16, 2021
    Publication date: November 9, 2023
    Applicant: Nitto Denko Corporation
    Inventors: Kozo NAKAMURA, Yufeng WENG, Takahiro YOSHIKAWA
  • Publication number: 20230350129
    Abstract: A backlight unit includes: a light source; a light guide plate arranged to face the light source, having an end surface that light from the light source enters; and an emitting surface from which the entered light is emitted; a reflective plate bonded to a back surface side of the light guide plate via a double-sided pressure-sensitive adhesive film; and a casing having a front portion and a back portion, the casing configured to store the light source, the light guide plate, and the reflective plate. The backlight unit is configured so that light from the light source is free from entering a space between the low-refractive index layer and the reflective plate, or so that light that has entered the space between the low-refractive index layer and the reflective plate from a light source is free from being emitted from the emitting surface of the light guide plate.
    Type: Application
    Filed: March 29, 2021
    Publication date: November 2, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takahiro YOSHIKAWA, Daisuke HATTORI, Ryota MORISHIMA, Atsushi KISHI
  • Publication number: 20230341608
    Abstract: An optical member that functions as an optical coupling layer has a first layer having a porous structure, and a second layer contacting a first main surface of the first layer. The second layer includes a resin composition, and has a transmittance of 5% to 85% with regard to a first light that is within the wavelength range of greater than 800 nm and less than or equal to 2000 nm. The first layer includes a first region having the porous structure, and a second region in which pores of the porous structure are filled with a resin composition.
    Type: Application
    Filed: September 24, 2021
    Publication date: October 26, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Naoyuki MATSUO, Takahiro YOSHIKAWA
  • Publication number: 20230312991
    Abstract: An optical laminate includes: a low-refractive index layer; a first pressure-sensitive adhesive layer arranged adjacent to the low-refractive index layer; and a second pressure-sensitive adhesive layer serving as one outermost layer. The low-refractive index layer has a porosity of 40 vol % or more; the first pressure-sensitive adhesive layer has a storage modulus of elasticity at 23° C. of from 1.0×105 (Pa) to 1.0×107 (Pa); the second pressure-sensitive adhesive layer has a storage modulus of elasticity at 23° C. of 1.0×105 (Pa) or less; a ratio of a thickness of the low-refractive index layer to a total thickness of the pressure-sensitive adhesive layers present in the optical laminate with pressure-sensitive adhesive layers on both surfaces is from 0.10% to 5.
    Type: Application
    Filed: March 23, 2021
    Publication date: October 5, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Daisuke Hattori, Ryota Morishima, Takahiro Yoshikawa, Atsushi Kishi
  • Publication number: 20230296217
    Abstract: An angle at which an intensity becomes maximum in a light distribution of light emitted from a center of a light emitting surface of a surface illumination device is in a range of ?90° or more to less than 0° in a plane including a vertical axis and perpendicular to the light emitting surface, in a case where an axis passing through the center of the light emitting surface and perpendicular to the floor surface is defined as the vertical axis, and in the plane, a direction extending from the center of the light emitting surface toward the floor surface is defined as ?90°, a direction extending from the center of the light emitting surface toward a side opposite to the floor surface is defined as +90°, and a direction orthogonal to the light emitting surface is defined as vertical 0°.
    Type: Application
    Filed: July 19, 2021
    Publication date: September 21, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takahiro YOSHIKAWA, Kozo NAKAMURA, Yufeng WENG
  • Publication number: 20230280005
    Abstract: A desktop illumination device includes a light source; and a light guide including a light guide plate. The light guide plate has a light incident surface and first and second main surfaces. An angle at which an intensity becomes maximum in a light distribution of light emitted from the first main surface is in a range of ?90° or more to less than 0°, in a case where an axis passing through a center of the first main surface and perpendicular to an installation surface is defined as a vertical axis, and in a plane including the vertical axis and perpendicular to the installation surface, a direction parallel to the installation surface is defined as vertical 0°, an upward angle with respect to the vertical 0° is defined as a positive angle, and a downward angle with respect to the vertical 0° is defined as a negative angle.
    Type: Application
    Filed: July 19, 2021
    Publication date: September 7, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takahiro YOSHIKAWA, Kozo NAKAMURA, Yufeng WENG
  • Publication number: 20230280523
    Abstract: A lightguide component for illumination devices includes: a lightguide layer having a first principal face, a second principal face at an opposite side from the first principal face, and a light-receiving side face to receive light emitted from a light source; a first low-refractive index layer (20A) that is disposed at the first principal face side of the lightguide layer, the first low-refractive index layer having a refractive index nL1 which is smaller than a refractive index nGP of the lightguide layer; and a light distribution controlling structure (14A, 14B) capable of at least directing a portion of light propagating in the lightguide layer toward the first low-refractive index layer or in an opposite direction from the first low-refractive index layer. The lightguide component has a visible light transmittance of 60% or more, and a haze value of less than 10%.
    Type: Application
    Filed: July 27, 2021
    Publication date: September 7, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kozo NAKAMURA, Yufeng WENG, Takahiro YOSHIKAWA
  • Publication number: 20230152509
    Abstract: Provided is an optical member, which is suppressed from causing a reduction in display quality due to wear or a flaw resulting from its vibration while maintaining the excellent characteristics of its low-refractive index layer. The optical member includes: a light guide plate having an end surface that light from a light source enters and an emitting surface from which the entered light is emitted; and a reflective plate bonded to a side of the light guide plate opposite to the emitting surface via a double-sided pressure-sensitive adhesive film. The double-sided pressure-sensitive adhesive film includes a first pressure-sensitive adhesive layer, a low-refractive index layer, and a second pressure-sensitive adhesive layer from the light guide plate side. The optical member further includes a surface-treated layer formed on a side of the reflective plate opposite to the double-sided pressure-sensitive adhesive film.
    Type: Application
    Filed: March 25, 2021
    Publication date: May 18, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takahiro Yoshikawa, Daisuke Hattori, Ryota Morishima, Atsushi Kishi
  • Publication number: 20230145275
    Abstract: Provided is a lighting apparatus having high light entrance efficiency with respect to a light guide plate, and being excellent in tint of light emitted from the light guide plate. The lighting apparatus of the present invention includes: an LED package; a light guide plate, which includes a main surface serving as a light emission surface, and a side surface serving as a light entrance surface, and which is arranged so that the side surface is opposed to the LED package; and a low-refractive index layer arranged between the LED package and the light guide plate.
    Type: Application
    Filed: March 26, 2021
    Publication date: May 11, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takahiro Yoshikawa, Daisuke Hattori, Ryota Morishima
  • Publication number: 20230129382
    Abstract: A backlight unit includes: a light source; a light guide plate having an end surface that is arranged to face the light source, and that light from the light source enters, and an emitting surface from which the entered light is emitted; a casing having a front portion and a back portion, the casing being configured to store the light source and the light guide plate; and an optical pressure-sensitive adhesive film arranged between the front portion of the casing on a light source side and the light guide plate, the optical pressure-sensitive adhesive film being bonded to the light guide plate. The optical pressure-sensitive adhesive film includes a light-absorbing layer, a substrate, a low-refractive index layer, and a pressure-sensitive adhesive layer in the stated order from a front portion side of the casing.
    Type: Application
    Filed: March 26, 2021
    Publication date: April 27, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Daisuke Hattori, Takahiro Yoshikawa, Ryota Morishima, Atsushi Kishi
  • Publication number: 20230110580
    Abstract: There is provided an optical member that can achieve a backlight unit excellent in brightness uniformity. The optical member includes: a light guide plate having an end surface that light from a light source enters, an emitting surface from which the entered light is emitted, and a light extraction pattern arranged on a surface opposite to the emitting surface; and a reflective plate bonded to the light guide plate via a double-sided pressure-sensitive adhesive film. An outer edge of the light guide plate is positioned outside an outer edge of the double-sided pressure-sensitive adhesive film, and the outer edge of the double-sided pressure-sensitive adhesive film is positioned outside an outer edge of the light extraction pattern.
    Type: Application
    Filed: March 26, 2021
    Publication date: April 13, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takahiro Yoshikawa, Daisuke Hattori, Ryota Morishima, Atsushi Kishi
  • Patent number: 11402569
    Abstract: The present invention provides an optical sheet for a light guide plate type liquid crystal display, including a low refractive index layer having an extremely low refractive index. The optical sheet A12 for a light guide plate type liquid crystal display (1000) according to the present invention includes a first optical film (light guide plate) (1010), a low refractive index layer (20), and a second optical film (reflection plate) (1020) laminated in this order, and the low refractive index layer (20) has a refractive index of 1.25 or less.
    Type: Grant
    Filed: January 30, 2018
    Date of Patent: August 2, 2022
    Assignee: NITTO DENKO CORPORATION
    Inventors: Daisuke Hattori, Kozo Nakamura, Takahiro Yoshikawa
  • Publication number: 20220187751
    Abstract: An imaging system includes a conveyor device to convey a sheet material along a conveyance path, a deformation tolerance portion located along the conveyance path, and a measurement device located in the deformation tolerance portion. The deformation tolerance portion includes a space to accommodate a bending of the conveyed sheet material. The measurement device measures a bending amount of the sheet material.
    Type: Application
    Filed: August 25, 2020
    Publication date: June 16, 2022
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: Yuichiro Tomishima, Takahiro Yoshikawa, Tomonori Ueno
  • Publication number: 20210181574
    Abstract: An investigation made by the inventors has found that when the pressure-sensitive adhesive layer having incorporated thereinto tetraazaporphyrin is used as a color correction member, the layer absorbs light having a wavelength around 545 nm, and hence the brightness of a panel including the layer reduces. A color correction member is disclosed that can satisfactorily achieve both of the widening of the color gamut of an image display apparatus and the prevention of a reduction in brightness thereof. A color correction member, which is characterized in that, when a value of an absorption peak at from 580 nm to 610 nm of an absorption spectrum is represented by Amax, and a value of an absorbance at 545 nm of the absorption spectrum is represented by A545, a ratio A545/Amax is 0.13 or less.
    Type: Application
    Filed: November 29, 2018
    Publication date: June 17, 2021
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kozo Nakamura, Takahiro Yoshikawa, Yufeng Weng, Peng Wang, Michael Welch, Shijun Zheng
  • Patent number: 10907816
    Abstract: A connector comprises a first connector and a second connector to be connected with the first connector. The first connector includes a first housing, a holding portion, and a stopper. The second connector includes a second housing, a held portion, and an engagement portion. At the waiting position, the first connector and the second connector are movable between positions in a wall contact state, at which the leading end of the second connector is in contact with the wall defining the receiving space of the first connector, and positions in a stopped state, at which the stopper of the first connector and the engagement portion of the second connector are in contact with each other.
    Type: Grant
    Filed: May 30, 2016
    Date of Patent: February 2, 2021
    Assignees: SAKAI DISPLAY PRODUCTS CORPORATION, ACES ELECTRONICS CO., LTD
    Inventors: Nobukazu Kato, I-chiao Tso, Takahiro Yoshikawa
  • Publication number: 20210027970
    Abstract: There is provided an optical member that can achieve a liquid crystal display apparatus having high brightness, an excellent hue, and a high color rendering property. An optical member according to the present invention includes, in the stated order: a first barrier layer; a first wavelength conversion layer; a second wavelength conversion layer; and a second barrier layer. The first wavelength conversion layer includes a matrix and a first wavelength conversion material dispersed in the matrix and having a predetermined center emission wavelength. The second wavelength conversion layer includes a matrix and a second wavelength conversion material dispersed in the matrix and having a center emission wavelength different from that of the first wavelength conversion material.
    Type: Application
    Filed: October 14, 2020
    Publication date: January 28, 2021
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kozo Nakamura, Takahiro Yoshikawa, Kazuhito Hosokawa
  • Publication number: 20200301207
    Abstract: An optical member is disclosed that can achieve a liquid crystal display apparatus having excellent durability and having a high color rendering property. An optical member according to the present invention includes, in the stated order: a first barrier layer; a wavelength conversion layer; and a second barrier layer. The wavelength conversion layer includes a matrix and a wavelength conversion material dispersed in the matrix. An emission spectrum of light to be extracted from the optical member has a peak having an intensity Gp in a wavelength band of from 515 nm to 550 nm, and a peak having an intensity Rp in a wavelength band of from 605 nm to 650 nm, and an average value Ave of intensities in a wavelength band of from 570 nm to 600 nm in the emission spectrum and an average value of Gp and Rp satisfy the following expression (1): Ave?0.1×{(Gp+Rp)/2}??(1).
    Type: Application
    Filed: March 15, 2017
    Publication date: September 24, 2020
    Applicant: NITTO DENKO CORPORATION
    Inventors: Takahiro Yoshikawa, Kozo Nakamura, Kazuhito Hosokawa
  • Patent number: 10655030
    Abstract: The present invention relates to a water-based ink including a pigment, a water-insoluble polymer, an organic solvent and a surfactant, in which the organic solvent includes at least a glycol ether which has a viscosity of from 2.0 to 7.0 mPa·s and a vapor pressure from 0.01 to 7.0 hPa as measured at 20° C., and a content of a glycol ether having a viscosity of not less than 6.0 mPa·s as measured at 20° C. as a component of the glycol ether in the water-based ink is from 0 to 5% by mass; the surfactant includes a silicone-based surfactant and a content of the silicone-based surfactant in the water-based ink is from 0.005 to 0.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: May 19, 2020
    Assignee: KAO CORPORATION
    Inventors: Hirotaka Takeno, Yuki Wakabayashi, Kaname Mitsuyoshi, Takahiro Yoshikawa
  • Publication number: 20200116921
    Abstract: The present invention provides an optical sheet for a light guide plate type liquid crystal display, including a low refractive index layer having an extremely low refractive index. The optical sheet A12 for a light guide plate type liquid crystal display (1000) according to the present invention includes a first optical film (light guide plate) (1010), a low refractive index layer (20), and a second optical film (reflection plate) (1020) laminated in this order, and the low refractive index layer (20) has a refractive index of 1.25 or less.
    Type: Application
    Filed: January 30, 2018
    Publication date: April 16, 2020
    Applicant: NITTO DENKO CORPORATION
    Inventors: Daisuke Hattori, Kozo Nakamura, Takahiro Yoshikawa
  • Patent number: 10316207
    Abstract: The present invention relates to a water-based ink that exhibits excellent ejection properties, and can be prevented from suffering from reduction in a dot size of the ink during a drying step thereof even when printed on a low-water absorbing recording medium, and is capable of obtaining printed characters or images having excellent uniformity, as well as an ink-jet printing method using the water-based ink. The water-based ink includes a pigment, a water-insoluble polymer, an acetylene glycol-based nonionic surfactant (A) having HLB of not less than 0 and not more than 5, a nonionic surfactant (B) having HLB of not less than 6 and not more than 20, a polyether-modified silicone (C) having a kinematic viscosity of not less than 30 mm2/s and not more than 190 mm2/s as measured at 25° C. and an organic solvent (D), in which a weighted mean value of a boiling point of the organic solvent (D) is not lower than 150° C. and not higher than 230° C.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: June 11, 2019
    Assignee: KAO CORPORATION
    Inventors: Kaname Mitsuyoshi, Hirotaka Takeno, Takayuki Suzuki, Takahiro Yoshikawa