Patents by Inventor Hiroyasu Fujiwara

Hiroyasu Fujiwara 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: 7787735
    Abstract: There is disclosed a waveguide structure that propagates surface plasmon waves, comprising: a quantum well structure, disposed on a semiconductor substrate; wherein the quantum well structure has a quantum well layer, in turn having an intersecting region that intersects a hypothetical plane substantially orthogonal to an alignment direction of the quantum well structure with respect to the semiconductor substrate, and a real part of a dielectric constant of the quantum well structure is negative for THz waves of a predetermined wavelength.
    Type: Grant
    Filed: July 6, 2007
    Date of Patent: August 31, 2010
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Hiroyasu Fujiwara, Masamichi Yamanishi, Akira Higuchi, Kazutoshi Nakajima
  • Patent number: 7764421
    Abstract: A wavelength-converted light generating apparatus 1A includes: an excitation light source 10 supplying excitation light L0 of a predetermined wavelength; and a wavelength conversion element 20, in which an aggregate 22 of crystals of a dye molecule is held by a holding substrate 21 and which, by incidence of the excitation light L0, generates converted light L1 that has been wavelength-converted. The excitation light source 10 supplies the excitation light L0 of a wavelength longer than an absorption edge of the dye molecule to the wavelength conversion element 20. The wavelength conversion element 20, by incidence of the excitation light L0 on the crystal aggregate 22, generates and outputs the converted light (for example, visible light) L1 that has been wavelength-converted to a shorter wavelength than the excitation light (for example, near-infrared light) L0.
    Type: Grant
    Filed: March 25, 2009
    Date of Patent: July 27, 2010
    Assignees: Hamamatsu Photonics K.K., The University of Tokyo
    Inventors: Hiroyasu Fujiwara, Motoichi Ohtsu, Tadashi Kawazoe
  • Publication number: 20100148667
    Abstract: When light is incident to an antenna layer AA6 of a photocathode AA1, light of a specific wavelength included in the incident light couples with surface plasmons in the antenna layer AA6 whereupon near-field light is outputted from a through hole AA14. The intensity of the output near-field light is proportional to and greater than the intensity of the light of the specific wavelength. The output near-field light has a wavelength that can be absorbed in a photoelectric conversion layer AA4. The photoelectric conversion layer AA4 receives the near-field light outputted from the through hole AA14. A region of the photoelectric conversion layer AA4 around the through hole AA14 absorbs the near-field light and generates photoelectrons (e?) in an amount according to the intensity of the near-field light. The photoelectrons (e?) generated in the photoelectric conversion layer AA4 are outputted to the outside.
    Type: Application
    Filed: February 25, 2010
    Publication date: June 17, 2010
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Minoru NIIGAKI, Toru Hirohata, Hiroyasu Fujiwara, Akira Higuchi
  • Publication number: 20090257114
    Abstract: A wavelength-converted light generating apparatus 1A includes: an excitation light source 10 supplying excitation light L0 of a predetermined wavelength; and a wavelength conversion element 20, in which an aggregate 22 of crystals of a dye molecule is held by a holding substrate 21 and which, by incidence of the excitation light L0, generates converted light L1 that has been wavelength-converted. The excitation light source 10 supplies the excitation light L0 of a wavelength longer than an absorption edge of the dye molecule to the wavelength conversion element 20. The wavelength conversion element 20, by incidence of the excitation light L0 on the crystal aggregate 22, generates and outputs the converted light (for example, visible light) L1 that has been wavelength-converted to a shorter wavelength than the excitation light (for example, near-infrared light) L0.
    Type: Application
    Filed: March 25, 2009
    Publication date: October 15, 2009
    Applicants: HAMAMATSU PHOTONICS K.K., The University of Tokyo
    Inventors: Hiroyasu Fujiwara, Motoichi Ohtsu, Tadashi Kawazoe
  • Patent number: 7557336
    Abstract: When light is made incident into antenna layers 11a, 11b, and 11c of a photodetector 1, specific wavelength components of light contained in the incident light combine with surface plasmons of the antenna layers 11a, 11b, and 11c, and surface plasmon resonance occurs. Thereby, near-field lights are outputted from through-holes 13 of the antenna layers 11a, 11b, and 11c. The near-field light outputted from each through-hole 13 reaches a light absorbing layer 4 via light receiving surfaces 4a, 4b, and 4c. The light absorbing layer 4 generates a charge of an amount according to the amount of received light. Since cycle intervals ?a, ?b, and ?c of convex portions 12 in the antenna layers 11a, 11b, and 11c are different from each other, the wavelength component of light that combines with a surface plasmon differs in each of the antenna layers 11a, 11b, and 11c. Consequently, a plurality of wavelength components of light can be detected.
    Type: Grant
    Filed: May 9, 2007
    Date of Patent: July 7, 2009
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Minoru Niigaki, Toru Hirohata, Hiroyasu Fujiwara, Akira Higuchi
  • Publication number: 20080042563
    Abstract: When light is incident to an antenna layer AA6 of a photocathode AA1, light of a specific wavelength included in the incident light couples with surface plasmons in the antenna layer AA6 whereupon near-field light is outputted from a through hole AA14. The intensity of the output near-field light is proportional to and greater than the intensity of the light of the specific wavelength. The output near-field light has a wavelength that can be absorbed in a photoelectric conversion layer AA4. The photoelectric conversion layer AA4 receives the near-field light outputted from the through hole AA14. A region of the photoelectric conversion layer AA4 around the through hole AA14 absorbs the near-field light and generates photoelectrons (e?) in an amount according to the intensity of the near-field light. The photoelectrons (e?) generated in the photoelectric conversion layer AA4 are outputted to the outside.
    Type: Application
    Filed: June 28, 2007
    Publication date: February 21, 2008
    Inventors: Minoru Niigaki, Toru Hirohata, Hiroyasu Fujiwara, Akira Higuchi
  • Publication number: 20080013878
    Abstract: There is disclosed a waveguide structure that propagates surface plasmon waves, comprising: a quantum well structure, disposed on a semiconductor substrate; wherein the quantum well structure has a quantum well layer, in turn having an intersecting region that intersects a hypothetical plane substantially orthogonal to an alignment direction of the quantum well structure with respect to the semiconductor substrate, and a real part of a dielectric constant of the quantum well structure is negative for THz waves of a predetermined wavelength.
    Type: Application
    Filed: July 6, 2007
    Publication date: January 17, 2008
    Inventors: Hiroyasu Fujiwara, Masamichi Yamanishi, Akira Higuchi, Kazutoshi Nakajima
  • Publication number: 20070262239
    Abstract: When light is made incident into antenna layers 11a, 11b, and 11c of a photodetector 1, specific wavelength components of light contained in the incident light combine with surface plasmons of the antenna layers 11a, 11b, and 11c, and surface plasmon resonance occurs. Thereby, near-field lights are outputted from through-holes 13 of the antenna layers 11a, 11b, and 11c. The near-field light outputted from each through-hole 13 reaches a light absorbing layer 4 via light receiving surfaces 4a, 4b, and 4c. The light absorbing layer 4 generates a charge of an amount according to the amount of received light. Since cycle intervals ?a, ?b, and ?c of convex portions 12 in the antenna layers 11a, 11b, and 11c are different from each other, the wavelength component of light that combines with a surface plasmon differs in each of the antenna layers 11a, 11b, and 11c. Consequently, a plurality of wavelength components of light can be detected.
    Type: Application
    Filed: May 9, 2007
    Publication date: November 15, 2007
    Inventors: Minoru Niigaki, Toru Hirohata, Hiroyasu Fujiwara, Akira Higuchi
  • Publication number: 20050139148
    Abstract: Method capable of preparing silicon having purity of about 6N applied to a solar cell efficiently at a low cost. Raw silicon containing boron and a slag are melted and a shaft is rotated by a rotating/driving mechanism for stirring the molten silicon. The molten slag is dispersed in the molten silicon, thereby accelerating the boron removal reaction. It is further effective to use a slag containing at least 45 percent by mass of silicon oxide or to blow gas mixed with water vapor into the molten silicon for refining reaction.
    Type: Application
    Filed: February 3, 2003
    Publication date: June 30, 2005
    Inventors: Hiroyasu Fujiwara, Ryotatsu Otsuka, Kenji Wada, Toshiaki Fukuyama
  • Publication number: 20030009319
    Abstract: An organization activity management method of managing data generated by a plurality of organizations on the basis of communication data transferred and received between the organizations, comprises inputting the communication data sent from a first organization to a second organization (S11, S31), simulating a first intra-organization procedure executed in the first organization when sending the communication data (S12 to S15, and S32 to S36), and recording first data generated by the first intra-organization procedure (S12 to S15, and S32 to S36).
    Type: Application
    Filed: December 17, 2001
    Publication date: January 9, 2003
    Applicant: Fujitsu Limited
    Inventors: Hiroyasu Fujiwara, Masaki Iwasada
  • Publication number: 20020013733
    Abstract: A system accepting and delivering data such as an invoice, etc., received via a network is made to comprise a deal information storing unit storing the information for a deal instructed from the sending source of the data, a received information appropriateness verifying unit verifying the appropriateness of the received data based on the deal information, a received information storing unit storing the data the appropriateness of which is verified by the received information appropriateness verifying unit, and a delivering unit delivering the data to a delivery destination if the deal information includes the information of the delivery destination of the data.
    Type: Application
    Filed: February 22, 2001
    Publication date: January 31, 2002
    Inventor: Hiroyasu Fujiwara
  • Publication number: 20010044796
    Abstract: A totalization system for totalizing information to be totalized comprises a to-be-totalized information storage unit, a hierarchical information storage unit, and a computing unit. The to-be-totalized information storage unit (data division) stores information to be totalized. The hierarchical information storage unit (structure) stores hierarchical information used in totalizing the information to be totalized. The computing unit totalizes the information stored in the to-be-totalized information storage unit with a hierarchical structure according to the hierarchical information stored in the hierarchical information storage unit. Creating each of the information to be totalized and the hierarchical information separately eliminates the need to add classification information to the data division.
    Type: Application
    Filed: February 21, 2001
    Publication date: November 22, 2001
    Inventor: Hiroyasu Fujiwara
  • Patent number: 5272816
    Abstract: This invention relates to a level which detects a level line or horizontal surface. The mixed liquid, composed of a main agent, 2,2-dichloro-1,1,1-trifluoroethane and an additive agent, comprising one or more of a soluble agent selected from the group of methyl alcohol, ethyl alcohol, acetone, hexane, heptane, isoamyl alcohol, allyl chloride, isopropyl chloride, propyl chloride, diethyl ether, dipropyl ether, pentane, methyl hexane and silicon oil, is contained and sealed, having a ratio of about 60:40 to about 70:30 between the main agent and the additive agent, with the dyestuff in a transparent heat-resistant tube.
    Type: Grant
    Filed: June 23, 1992
    Date of Patent: December 28, 1993
    Assignee: Takao Manufacture Co., Ltd.
    Inventor: Hiroyasu Fujiwara