Patents by Inventor Yukito Saitoh

Yukito Saitoh 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: 20210231985
    Abstract: Provided are an optical laminate in which a large diffraction angle can be obtained, a light guide element, and an AR display device.
    Type: Application
    Filed: April 9, 2021
    Publication date: July 29, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Hiroshi SATO, Yukito SAITOH, Katsumi SASATA
  • Publication number: 20210223448
    Abstract: Provided are an optical laminate that can refract incident light with a high use efficiency to be incident into a light guide plate or the like, and a light guide element and an image display device including the optical laminate. The optical laminate includes first and second cholesteric liquid crystal layers that have a liquid crystal alignment pattern in which a direction of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction, in which in the first and second cholesteric liquid crystal layers, helical pitches in a cholesteric liquid crystalline phase are different from each other, turning directions of circularly polarized light to be reflected are the same, and rotation directions of the direction of the optical axis that continuously rotates in at least one in-plane direction in the liquid crystal alignment pattern are the same.
    Type: Application
    Filed: April 9, 2021
    Publication date: July 22, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Hiroshi SATO, Yukito SAITOH, Katsumi SASATA
  • Publication number: 20210223581
    Abstract: Provided are an optical laminate in which a large diffraction angle can be obtained, a light guide element, and an AR display device.
    Type: Application
    Filed: April 9, 2021
    Publication date: July 22, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Yukito SAITOH, Hiroshi SATO, Katsumi SASATA
  • Publication number: 20210208316
    Abstract: Provided are an optical element, including a plurality of optically anisotropic layers, each of which has an in-plane alignment pattern in which orientations of optical axes derived from a liquid crystal compound change continuously and rotationally along at least one in-plane direction, in a thickness direction, in which the optically anisotropic layers each have regions where lengths over which the orientations of the optical axes rotate by 180° in the one direction are different from each other, and at least one of the plurality of optically anisotropic layers is an inclined optically anisotropic layer having a region where a plurality of pairs of bright lines and dark lines in a cross-sectional image are present and the pairs of the bright lines and the dark lines are inclined at inclination angles which are different from each other with respect to a normal line of an interface of the optically anisotropic layer.
    Type: Application
    Filed: March 25, 2021
    Publication date: July 8, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Hiroshi SATO, Yukito SAITOH, Katsumi SASATA
  • Patent number: 11016230
    Abstract: Provided is an optical element including a wavelength selective reflective polarizer and a ?/2 plate in which the ?/2 plate includes an optically anisotropic layer which has an optical axis in a direction parallel to a surface and is formed of a cured layer of a liquid crystal composition and has a liquid crystal alignment pattern in which an orientation of the optical axis changes while continuously rotating in at least one direction in a plane of the optically anisotropic layer, and light in the specific wavelength range which is circularly polarized light oriented in a direction opposite to that of the specific circularly polarized light among light incident on a surface of the optical element on the ?/2 plate side is reflected in a direction different from a regular reflection direction of the incident light.
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: May 25, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Yukito Saitoh, Hiroshi Sato
  • Publication number: 20210149248
    Abstract: Provided are a novel optical element that can be used as a sensor or the like and a sensor including the same optical element. The optical element includes a cholesteric liquid crystal layer, in which the cholesteric liquid crystal layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from a liquid crystal compound changes while continuously rotating in at least one in-plane direction, and in a case where a cross-section taken in a thickness direction conforming the in-plane direction in which the direction of the optical axis rotates is observed using a scanning electron microscope, a portion where a bright line and a dark line derived from the cholesteric liquid crystalline phase are discontinuous is provided in the cholesteric liquid crystal layer in the in-plane direction in which the direction of the optical axis rotates.
    Type: Application
    Filed: January 26, 2021
    Publication date: May 20, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Yukito SAITOH, Hiroshi SATO
  • Publication number: 20210149098
    Abstract: Provided are an optical element including a first optically-anisotropic layer consisting of a cured layer of a composition including a first liquid crystal compound, in which the first optically-anisotropic layer has 0.24 or more of a refractive index anisotropy ?n550 which is measured with light having a wavelength of 550 nm, the first optically-anisotropic layer has a first liquid crystal alignment pattern in which a direction of an optical axis derived from the first liquid crystal compound continuously changes rotationally in at least one in-plane direction, and in the first liquid crystal alignment pattern, in a case where a length ? over which the direction of the optical axis rotates 180° in a plane is defined as a single period, the length ? of the single period is 1.6 ?m or less; a method for forming a photo-alignment pattern; and a method for manufacturing an optical element.
    Type: Application
    Filed: January 26, 2021
    Publication date: May 20, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Katsumi SASATA, Ryoji GOTO, Hiroshi SATO, Yukito SAITOH
  • Publication number: 20210149256
    Abstract: Provided are a method of manufacturing an optical element in which an optically-anisotropic layer having a small amount of in-plane unevenness can be prepared, and an optical element.
    Type: Application
    Filed: January 26, 2021
    Publication date: May 20, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Hiroshi SATO, Yukito SAITOH
  • Publication number: 20210149095
    Abstract: Provided are a method of manufacturing an optical element in which an optically-anisotropic layer having a small amount of in-plane unevenness can be prepared, and an optical element.
    Type: Application
    Filed: January 26, 2021
    Publication date: May 20, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Hiroshi SATO, Yukito SAITOH
  • Publication number: 20210149255
    Abstract: Provided are a method of manufacturing an optical element in which an optically-anisotropic layer having a small amount of in-plane unevenness can be prepared, and an optical element.
    Type: Application
    Filed: January 26, 2021
    Publication date: May 20, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Hiroshi SATO, Yukito SAITOH
  • Patent number: 11003026
    Abstract: Provided are a thin stereoscopic image display device that can also deal with a requirement for flexibility and a wearable display device including this stereoscopic image display device. The stereoscopic image display device includes a display panel, an optical element, and a circularly polarizing plate, in which the optical element includes an optically-anisotropic layer that is formed of a liquid crystal compound, the optically-anisotropic layer has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating along at least one in-plane direction of the optically-anisotropic layer, and circularly polarized light emitted from the display panel is caused to advance in a direction different from a direction in which the circularly polarized light component is incident.
    Type: Grant
    Filed: December 27, 2019
    Date of Patent: May 11, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Hiroshi Sato, Yukito Saitoh
  • Patent number: 10996510
    Abstract: The planar lighting device includes: a light source; and a brightness homogenizing member that has a laminate structure including high refractive index layers and low refractive index layers, and a light incidence portion that allows light emitted from each of the plurality of point light sources to be incident into the high refractive index layers is provided at a position of the laminate structure facing the point light source. The light incidence portion is formed of a hollow portion that is provided across the two or more high refractive index layers included in the laminate structure to penetrate at least one high refractive index layer and has a function of allowing the light to be incident into the high refractive index layers, and each of the high refractive index layers includes a light extraction mechanism that is provided at a position spaced apart from the light incidence portion.
    Type: Grant
    Filed: April 23, 2020
    Date of Patent: May 4, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Naoyoshi Yamada, Yukito Saitoh
  • Patent number: 10989849
    Abstract: An optical laminate includes a wavelength selective reflective element, and an absolute phase adjustment layer which is provided on at least one surface side of the wavelength selective reflective element and has optical isotropy, and in which a first region having a first optical path length and a second region having a second optical path length different from the first optical path length are arranged in a pattern with a diffraction grating-like period. The optical laminate reflects light in the specific reflection wavelength region by the wavelength selective reflective element, of light incident from the absolute phase adjustment layer side. In the optical laminate, light which enters the first region of the absolute phase adjustment layer and is reflected by the wavelength selective reflective element and light which enters the second region and is reflected by the wavelength selective reflective element interfere with each other.
    Type: Grant
    Filed: January 21, 2019
    Date of Patent: April 27, 2021
    Assignee: FUJIFILM CORPORATION
    Inventors: Ryo Satake, Yukito Saitoh, Daisuke Kashiwagi
  • Patent number: 10961328
    Abstract: An optical film including: a cholesteric layer of a disk-like liquid crystal composition including a disk-like liquid crystal compound, in which the cholesteric layer exhibits a cholesteric liquid crystalline phase, and in which fluctuation of a helical pitch in a film thickness direction of the cholesteric layer is 2% or greater, and having a cholesteric liquid crystalline phase of a disk-like liquid crystal compound and a wide reflection bandwidth; a brightness enhancement film; a backlight unit with a brightness enhancement film; and a liquid crystal display device.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: March 30, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Wataru Hoshino, Yukito Saitoh, Kunihiro Atsumi
  • Publication number: 20210088703
    Abstract: The optical element is an optical element including a first optically anisotropic layer which is a cured layer of a liquid crystal composition containing a rod-like liquid crystal compound and a second optically anisotropic layer which is laminated on the first optically anisotropic layer and is a cured layer of a liquid crystal composition containing a disk-like liquid crystal compound, wherein each of the first optically anisotropic layer and the second optically anisotropic layer, has a liquid crystal alignment pattern in which an optical axis of the rod-like liquid crystal compound and an optical axis of the disk-like liquid crystal compound are respectively parallel to a surface of the optically anisotropic layer and oriented along at least one in-plane direction, orientation of the optical axis changes continuously and rotationally, and the orientation of the optical axis rotates by 180° with a period of 0.5 ?m to 5 ?m.
    Type: Application
    Filed: November 17, 2020
    Publication date: March 25, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Yukito SAITOH, Hiroshi SATO
  • Patent number: 10955705
    Abstract: A wearable display device 1 includes a display panel 11, an eyepiece 31, and an optical element 21 that is disposed between the display panel 11 and the eyepiece 31, in which the optical element 21 includes an optically-anisotropic layer 23 that is formed of a cured layer of a composition including a liquid crystal compound 24, and the optically-anisotropic layer 23 has a liquid crystal alignment pattern AP1 in which a direction of an optical axis derived from the liquid crystal compound 24 changes while continuously rotating along at least one in-plane direction of the optically-anisotropic layer 23.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: March 23, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Hiroshi Sato, Yukito Saitoh
  • Patent number: 10935836
    Abstract: The present invention provides an organic electroluminescent display device that further suppresses reflection of external light and a change in tint in a case of being viewed in an oblique direction, a phase difference film, and a circularly polarizing plate. This organic electroluminescent display device has an organic electroluminescent display panel and a circularly polarizing plate. The circularly polarizing plate has a polarizer and a phase difference film. The phase difference film has, from the polarizer side, a positive A-plate, a first positive C-plate, and a ?/4 plate. The positive A-plate and the first positive C-plate have predetermined optical properties. The in-plane slow axis of the positive A-plate and the absorption axis of the polarizer are orthogonal to each other. The angle formed between the in-plane slow axis of the positive A-plate and the in-plane slow axis of the ?/4 A plate is 45°±10°.
    Type: Grant
    Filed: August 1, 2019
    Date of Patent: March 2, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Kunihiro Atsumi, Yukito Saitoh
  • Publication number: 20210041610
    Abstract: An object of the present invention is to provide a light deflection device having a simple structure suitable for reducing the size and weight where a deflection angle can be increased. The object can be achieved with a light deflection device including: a light deflection element that deflects incident light in one direct to be emitted; a driving unit that drives the light deflection element; and a diffraction element that is disposed on a light emission side of the light deflection element in which a periodic structure pitch gradually changes from a center of deflection from the light deflection element toward an outside.
    Type: Application
    Filed: September 28, 2020
    Publication date: February 11, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Yukito SAITOH, Hiroshi SATO
  • Publication number: 20210033764
    Abstract: An object is to provide an optical element in which a wavelength dependence of refraction of transmitted light is small, and a light guide element including the optical element.
    Type: Application
    Filed: October 5, 2020
    Publication date: February 4, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Hiroshi SATO, Yukito SAITOH
  • Publication number: 20210033765
    Abstract: An object of the present invention is to provide a light irradiation device which is thin and is capable of projecting an optical pattern, and a sensor which uses the light irradiation device. The object is achieved by a light irradiation device including a light emitting element which includes a plurality of light emitting units in a plane; and a liquid crystal optical element, in which the liquid crystal optical element has an optically anisotropic layer formed using a liquid crystal composition containing a liquid crystal compound, the optically anisotropic layer has a liquid crystal alignment pattern in which orientation of an optical axis derived from the liquid crystal compound continuously changes rotationally along at least one in-plane direction and has regions with different lengths of periods in a case where a length over which the orientation of the optical axis derived from the liquid crystal compound rotates by 180° in the plane is denoted by a single period.
    Type: Application
    Filed: October 19, 2020
    Publication date: February 4, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Hiroshi Sato, Yukito Saitoh