Patents by Inventor Yohei Takano

Yohei Takano 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: 12271104
    Abstract: A light-source device, an image projection apparatus, and a display device. The light-source device includes a light source to emit light, an optical element having a lens array on one side or both sides of which a plurality of lenses are arrayed with distance from each other, the distance between a pair of vertices of an adjacent pair of the plurality of lenses of the optical element being equal to or less than one-quarter of width of light flux of the light incident on the optical element, and a wavelength conversion element to convert a wavelength of the light emitted from the light source and passed through the optical element. An image projection apparatus includes the light-source device, a light mixing element to mix the light emitted from the light-source device to uniformize the light, and an illumination optical system to emit the light uniformized by the light mixing element.
    Type: Grant
    Filed: September 16, 2022
    Date of Patent: April 8, 2025
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yohei Takano, Makoto Hirakawa, Kazuhiro Fujita, Takashi Sasaki
  • Publication number: 20250046898
    Abstract: A cathode recovery apparatus includes separation means that separates an electrode body in a pulled-out state into a cathode and a negative electrode laminate, that includes: a holding section holding an extension region where a first object to be separated, being one of the cathode and the negative electrode laminate, extends further in a pulled-out direction than a second object to be separated, being another one of the cathode and the negative electrode laminate, the holding section holding the extension region so that a head end portion of the second object is included in the electrode body; a pressing section pressing the electrode body from a side of the first object in a thickness direction at upstream of the holding section in the pulled-out direction, and peels off a head end portion of the second object; and a receiving section receiving the peeled off second object.
    Type: Application
    Filed: July 29, 2024
    Publication date: February 6, 2025
    Inventors: Yohei Takano, Hideki Hashimoto, Kazuo Ishikawa
  • Patent number: 12130544
    Abstract: A light-source optical system includes a wavelength converter on which light of first color is incident, the wavelength converter converting at least a part of the light of first color into light of second color different from the light of first color, a first optical system disposed upstream from the wavelength converter on an optical path of the light of first color, the first optical system including optical elements, a reflection plane disposed downstream from the first optical system on the optical path, and a second optical system disposed downstream from the reflection plane on the optical path. The reflection plane reflects one of the light of first color and the light of second color, and a conditional expression 0<?L/D<0.2 is satisfied.
    Type: Grant
    Filed: October 28, 2020
    Date of Patent: October 29, 2024
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yohei Takano, Kasumi Nakamura, Makoto Hirakawa
  • Patent number: 12114106
    Abstract: A light-source device includes an excitation light source, an optical member, and a wavelength converter. The excitation light source is configured to emit first color light. The optical member has a reflecting surface configured to reflect the first color light emitted from the excitation light source. The wavelength converter includes a wavelength conversion member on which the first color light reflected by the optical member is incident. The wavelength conversion member is configured to convert at least part of the first color light into second color light having a wavelength different from a wavelength of the first color light and emit the second color light. A center of the first color light on the reflecting surface of the optical member does not intersect with a light flux of the first color light emitted from the wavelength converter.
    Type: Grant
    Filed: April 27, 2023
    Date of Patent: October 8, 2024
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yohei Takano, Kazuhiro Fujita, Kasumi Nakamura
  • Patent number: 12072617
    Abstract: A light source optical system includes: a first optical system configured to guide a first light beam having a first wavelength emitted from a light source to a wavelength conversion element; the wavelength conversion element configured to convert the first light beam into a second light beam having a second wavelength different from the first wavelength, and emit the second light beam; and a second optical system through which the second light beam emitted from the light conversion element passes. The second optical system includes a light guide element configured to guide a portion of the second light beam from one end surface of the light guide element to the other end surface of the light guide element to separate the portion of the second light beam from the second light beam.
    Type: Grant
    Filed: April 21, 2023
    Date of Patent: August 27, 2024
    Assignee: RICOH COMPANY, LTD.
    Inventors: Makoto Hirakawa, Yohei Takano, Kasumi Nakamura
  • Patent number: 12066752
    Abstract: A light-source device includes an excitation light source to emit first color light; an optical member having a reflecting surface to reflect the first color light; a wavelength conversion unit including a wavelength conversion member on which the first color light reflected by the optical member is incident, the wavelength conversion member to convert at least part of the first color light into second color light having a wavelength different from a wavelength of the first color light and emit the second color light; and a light condensing element to condense the first color light emitted from the wavelength conversion unit. A straight line including a first optical path from a center of a flux of light rays emitted from the excitation light source, to the center of the first color light on the reflecting surface does not intersect with a light flux condensed by the light condensing element.
    Type: Grant
    Filed: October 29, 2020
    Date of Patent: August 20, 2024
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kazuhiro Fujita, Kasumi Nakamura, Yohei Takano
  • Patent number: 11953816
    Abstract: A wavelength conversion plate includes a conversion region and a reflection region on a base surface. The conversion region includes a wavelength conversion member configured to receive excitation light and generate a color different from a color of the excitation light. The reflection region is configured to reflect the excitation light. The reflection region includes a transmissive diffusion surface, a transmissive layer, and a reflection surface. The transmissive diffusion surface is configured to diffuse the excitation light. The transmissive layer is configured to transmit the excitation light. The reflection surface is configured to reflect the excitation light. The transmissive diffusion surface is in a position separate from a surface closer to the base surface, of the wavelength conversion member, toward a direction from which the excitation light is incident.
    Type: Grant
    Filed: July 25, 2022
    Date of Patent: April 9, 2024
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kazuhiro Fujita, Yohei Takano, Kasumi Nakamura
  • Publication number: 20240080419
    Abstract: A light-source device includes an excitation light source, an optical member, and a wavelength converter. The excitation light source is configured to emit first color light. The optical member has a reflecting surface configured to reflect the first color light emitted from the excitation light source. The wavelength converter includes a wavelength conversion member on which the first color light reflected by the optical member is incident. The wavelength conversion member is configured to convert at least part of the first color light into second color light having a wavelength different from a wavelength of the first color light and emit the second color light. A center of the first color light on the reflecting surface of the optical member does not intersect with a light flux of the first color light emitted from the wavelength converter.
    Type: Application
    Filed: April 27, 2023
    Publication date: March 7, 2024
    Applicant: Ricoh Company, Ltd.
    Inventors: Yohei TAKANO, Kazuhiro FUJITA, Kasumi NAKAMURA
  • Publication number: 20240039067
    Abstract: The treating method for a positive electrode for a non-aqueous electrolyte secondary battery is a treating method for a positive electrode for a non-aqueous electrolyte secondary battery which comprises a positive electrode having a foil containing Al and an active material which is a metal composite oxide, the method comprising: conducting a heating treatment for heating the positive electrode (heating step); melting the positive electrode using heat of reaction of the foil and the active material to obtain a molten material (melting step); and separating the molten material into a metal material containing a metal constituting the metal composite oxide and a slag (separating step). By subjecting the positive electrode to heating treatment, a reduction reaction of the positive electrode can be promoted at a low cost.
    Type: Application
    Filed: July 28, 2021
    Publication date: February 1, 2024
    Inventors: Yutaro KIKUCHI, Atsushi YOKOYAMA, Shinichi OGURA, Yohei TAKANO, Hideki HASHIMOTO, Kenji HAYASHI
  • Patent number: 11874592
    Abstract: A light source device includes: a first light source to emit first color light; a second light source to emit second color light; a wavelength conversion unit to convert at least a portion of the first color light into a third color light; a light incident element to which the first color light, the second color light, and the third color light enter; a first filter to reflect the first color light toward the wavelength conversion unit; and a second filter to reflect the second color light toward the light incident element. The first filter and the second filter are separately disposed on an optical path of the third color light between the wavelength conversion unit and the light incident element.
    Type: Grant
    Filed: March 11, 2022
    Date of Patent: January 16, 2024
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kasumi Nakamura, Yohei Takano, Kazuhiro Fujita, Takashi Sasaki, Shigeaki Imai, Makoto Hirakawa
  • Patent number: 11829058
    Abstract: A light-source device includes an excitation light source; an optical element having a reflecting surface to reflect first colored light emitted from the excitation light source; and a wavelength conversion unit including a waveform conversion member configured to convert at least a portion of the first colored light reflected by the optical element and incident on the wavelength conversion unit, into second colored light having a wavelength different from a wavelength of the first colored light and emit the second colored light. A point P does not intersect with a light flux Q where the point P is a center of the first colored light on the reflecting surface of the optical element and the light flux Q is a light flux of the first colored light emitted from the wavelength conversion unit.
    Type: Grant
    Filed: March 19, 2020
    Date of Patent: November 28, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kasumi Nakamura, Yohei Takano, Tatsuya Takahashi, Makoto Hirakawa
  • Patent number: 11812201
    Abstract: A light guide optical device includes an optical path combiner including: a first deflector to deflect first light incident from a first direction to an emission direction; a second deflector to deflect second light incident from a second direction different from the first direction, to the emission direction; and a transmission portion between the first deflector and the second deflector, the transmission portion to transmit third light incident from a third direction different from each of the first direction and the second direction, to the emission direction. The optical path combining unit combines the first light, the second light, and the third light, and emits the combined light to the mission direction.
    Type: Grant
    Filed: April 20, 2022
    Date of Patent: November 7, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Takashi Sasaki, Yohei Takano, Kasumi Nakamura, Kazuhiro Fujita, Makoto Hirakawa, Shigeaki Imai
  • Patent number: 11762272
    Abstract: A light-source device includes an excitation light source; a wavelength conversion unit to convert at least some of first color light into second color light; a light mixing element including a rod integrator to mix at least one of the first color light and the second color light from the conversion unit; and an optical element on an optical path of the first color light and having a reflecting surface. A center of the first color light on the reflecting surface intersects with only one of a first light flux of the first color light incident on and a second light flux of the first color light emitted from the conversion unit. An angle formed by a projection straight line of the first color light incident on an incident aperture of the integrator and a predetermined axial line of the incident aperture of the integrator is smaller than 40°.
    Type: Grant
    Filed: October 20, 2022
    Date of Patent: September 19, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kasumi Nakamura, Yohei Takano, Makoto Hirakawa, Kazuhiro Fujita
  • Publication number: 20230288791
    Abstract: A light source device includes: a light source to emit light including first color light of excitation light; an optical element including multiple lenses on at least one surface of the optical element; a condenser optical system to condense the first color light; a wavelength converter to convert the first color light into second color light; and a color light separator to separate the first color light and the second color light. The light source, the optical element, the condenser optical system, the wavelength converter, and the color light separator are disposed in this order from the light source. The multiple lenses of the optical element has: a first divergence angle in a first direction along a plane of the multiple lenses; and a second divergence angle in a second direction orthogonal to the first direction, and the first divergence angle is smaller than a second divergence angle.
    Type: Application
    Filed: February 28, 2023
    Publication date: September 14, 2023
    Inventors: Yohei TAKANO, Makoto HIRAKAWA, Takashi SASAKI, Kasumi NAKAMURA, Kazuhiro FUJITA
  • Publication number: 20230259012
    Abstract: An illumination device includes: a first light source to emit a first light beam having a first intensity distribution in a first direction; a second light source to emit a second light beam having a second intensity distribution in a second direction different from the first direction; a light combiner to combine the first light beam and the second light beam; and a light homogenizer to homogenize the first intensity distribution and the second intensity distribution to generate a third light beam. The light combiner is a polygonal prism including: a reflection surface to generate a reflection light beam; and multiple transmission surfaces to generate a transmission light beam. The light homogenizer homogenizes the reflection light beam and the transmission light beam and emits the third light beam. The first light beam and the second light beam propagate in different optical paths in the light combiner.
    Type: Application
    Filed: February 9, 2023
    Publication date: August 17, 2023
    Inventors: Takashi SASAKI, Yohei TAKANO, Kazuhiro FUJITA, Kasumi NAKAMURA
  • Publication number: 20230251559
    Abstract: A light source optical system includes: a first optical system configured to guide a first light beam having a first wavelength emitted from a light source to a wavelength conversion element; the wavelength conversion element configured to convert the first light beam into a second light beam having a second wavelength different from the first wavelength, and emit the second light beam; and a second optical system through which the second light beam emitted from the light conversion element passes. The second optical system includes a light guide element configured to guide a portion of the second light beam from one end surface of the light guide element to the other end surface of the light guide element to separate the portion of the second light beam from the second light beam.
    Type: Application
    Filed: April 21, 2023
    Publication date: August 10, 2023
    Applicant: Ricoh Company, Ltd.
    Inventors: Makoto HIRAKAWA, Yohei TAKANO, Kasumi NAKAMURA
  • Publication number: 20230251558
    Abstract: A light source device includes: a first light source configured to emit a first excitation beam; a second light source different from the first light source, a second light source configured to emit a second excitation beam; an optical combiner configured to: reflect or transmit the first excitation beam; and reflect or transmit the second excitation beam; a first wavelength converter including a first phosphor to emit a first fluorescent beam proceeding in a first optical path; and a second wavelength convertor including a second phosphor to emit a second fluorescent beam proceeding in a second optical path. The optical combiner is at a point at which the first optical path of the first fluorescent beam intersects the second optical path of the second fluorescent beam.
    Type: Application
    Filed: February 2, 2023
    Publication date: August 10, 2023
    Inventors: Kasumi NAKAMURA, Yohei TAKANO, Kazuhiro FUJITA
  • Patent number: 11720010
    Abstract: A light source device includes a light source, a plurality of wavelength conversion units, and a plurality of optical systems. The plurality of wavelength conversion units each includes a wavelength conversion region configured to receive light emitted from the light source and emit light with a wavelength different from a wavelength of the received light. The plurality of optical systems are configured to form images of wavelength conversion regions of the plurality of wavelength conversion units. The light source is configured to irradiate the wavelength conversion units with light at a same timing. The plurality of optical systems are configured to cause the images of the wavelength conversion regions of the plurality of wavelength conversion units to be adjacent to or superimposed on each other.
    Type: Grant
    Filed: December 1, 2021
    Date of Patent: August 8, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kazuhiro Fujita, Yohei Takano, Makoto Hirakawa, Shigeaki Imai
  • Patent number: 11677914
    Abstract: A light-source device includes an excitation light source, an optical member, and a wavelength converter. The excitation light source is configured to emit first color light. The optical member has a reflecting surface configured to reflect the first color light emitted from the excitation light source. The wavelength converter includes a wavelength conversion member on which the first color light reflected by the optical member is incident. The wavelength conversion member is configured to convert at least part of the first color light into second color light having a wavelength different from a wavelength of the first color light and emit the second color light. A center of the first color light on the reflecting surface of the optical member does not intersect with a light flux of the first color light emitted from the wavelength converter.
    Type: Grant
    Filed: October 30, 2020
    Date of Patent: June 13, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yohei Takano, Kazuhiro Fujita, Kasumi Nakamura
  • Patent number: 11669004
    Abstract: A light source optical system includes: a first optical system configured to guide a first light beam having a first wavelength emitted from a light source to a wavelength conversion element; the wavelength conversion element configured to convert the first light beam into a second light beam having a second wavelength different from the first wavelength, and emit the second light beam; and a second optical system through which the second light beam emitted from the light conversion element passes. The second optical system includes a light guide element configured to guide a portion of the second light beam from one end surface of the light guide element to the other end surface of the light guide element to separate the portion of the second light beam from the second light beam.
    Type: Grant
    Filed: November 23, 2021
    Date of Patent: June 6, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Makoto Hirakawa, Yohei Takano, Kasumi Nakamura