Patents by Inventor Yasuharu Negi

Yasuharu Negi 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: 11118969
    Abstract: An electron tube includes a photoelectric surface, an avalanche photodiode, a focusing electrode part that accelerates and focuses the electrons E from the photoelectric surface toward the avalanche photodiode, and a casing including a stem provided with the avalanche photodiode. The stem is provided with a light incident hole through which the light is transmitted, and the periphery of the light incident hole is light-shielded by the stem. The focusing electrode part includes a first region provided with a light passage hole, and a second region provided with an electron passage hole that guides the electrons to the avalanche photodiode. The first region is formed on an axial line that connects the light incident hole and the photoelectric surface. The second region is formed on an axial line that connects the photoelectric surface and the avalanche photodiode.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: September 14, 2021
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Atsuhito Fukasawa, Yasuyuki Egawa, Shigeru Ichikawa, Yasuharu Negi
  • Publication number: 20200149959
    Abstract: An electron tube includes a photoelectric surface, an avalanche photodiode, a focusing electrode part that accelerates and focuses the electrons E from the photoelectric surface toward the avalanche photodiode, and a casing including a stem provided with the avalanche photodiode. The stem is provided with a light incident hole through which the light is transmitted, and the periphery of the light incident hole is light-shielded by the stem. The focusing electrode part includes a first region provided with a light passage hole, and a second region provided with an electron passage hole that guides the electrons to the avalanche photodiode. The first region is formed on an axial line that connects the light incident hole and the photoelectric surface. The second region is formed on an axial line that connects the photoelectric surface and the avalanche photodiode.
    Type: Application
    Filed: June 15, 2018
    Publication date: May 14, 2020
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Atsuhito FUKASAWA, Yasuyuki EGAWA, Shigeru ICHIKAWA, Yasuharu NEGI
  • Patent number: 7692384
    Abstract: An envelope has a glass bulb body and a cylindrical glass bulb base. The glass bulb body includes an upper hemisphere and a lower hemisphere. The upper hemisphere is curved in a substantially spherical shape. The lower hemisphere is substantially curved in a spherical shape and connects the upper hemisphere and glass bulb base. A photocathode is formed on the inner surface of the glass bulb body. An avalanche photodiode is disposed on the glass bulb body side relative to an intersection between an imaginary extended curved surface of the lower hemisphere within the glass bulb base and an axis. When light enters the photocathode, electrons are emitted from the photocathode. The electrons are converged at the position above and in the vicinity of the APD by an electrical field in the electron tube, so that the electrons enter the APD in an efficient manner and are detected satisfactorily.
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: April 6, 2010
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Hiroyuki Kyushima, Motohiro Suyama, Suenori Kimura, Yasuharu Negi, Atsuhito Fukasawa, Yoshihiko Kawai, Atsushi Uchiyama, Yasuyuki Egawa
  • Patent number: 7525249
    Abstract: In an electron tube, an insulating tube protrudes inside an envelope. One end of the insulating tube is connected to the envelope. An avalanche photo diode (APD) is provided on the other end of the insulating tube. A ground voltage is applied to the envelope and a positive high voltage is applied to the APD. Photoelectrons which are emitted in response to an incident light on a photocathode are converged by an electrical field in the envelope and enter the APD. Thereafter, the incident photoelectrons are amplified and detected. Since a positive high voltage is not exposed to the envelope, the electron tube can easily be handled and is excellent in safety.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: April 28, 2009
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Motohiro Suyama, Hiroyuki Kyushima, Suenori Kimura, Yasuharu Negi, Atsuhito Fukasawa, Yoshihiko Kawai, Atsushi Uchiyama, Yasuyuki Egawa
  • Patent number: 7491918
    Abstract: An insulating tube has one end and another end. An avalanche photodiode (APD) is provided outside the one end of the insulating tube. The another end of the insulating tube is air-tightly connected to an outer flange through a stem inner wall. Capacitors electrically connected to the APD are provided in the insulating tube. The capacitors remove direct current components from signals that the APD generates when detecting electrons. By providing the capacitors in the insulating tube, response of output signals can be prevented from being impaired.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: February 17, 2009
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Hiroyuki Kyushima, Motohiro Suyama, Suenori Kimura, Yasuharu Negi, Yoshihiko Kawai, Atsuhito Fukasawa
  • Patent number: 7176429
    Abstract: In an electron tube, one end of an insulating tube is protruded toward the inside of an envelope, and an avalanche photodiode (APD) is provided on the one end of the insulating tube. Another end of the insulating tube is connected to an outer stem of the envelope. Alkali sources are provided inside the envelope. The alkali sources are disposed inside the envelope and generates alkali metal vapor to thereby form a photocathode on a predetermined part of the internal surface of the envelope. The alkali sources and insulating tube are isolated from each other by a separating member. When the electron tube is manufactured, the alkali metal vapor that is generated from the alkali sources is not deposited on the insulating tube due to existence of the separating member. This prevents voltage resistance between the envelope and APD from being decreased and the electrical field in the electron tube from being adversely affected, thereby preventing incident efficiency of electrons to the APD from being decreased.
    Type: Grant
    Filed: September 9, 2004
    Date of Patent: February 13, 2007
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Motohiro Suyama, Hiroyuki Kyushima, Yasuharu Negi, Atsuhito Fukasawa, Yoshihiko Kawai, Yasuyuki Egawa, Atsushi Uchiyama, Suenori Kimura
  • Publication number: 20070029930
    Abstract: In an electron tube, an insulating tube protrudes inside an envelope. One end of the insulating tube is connected to the envelope. An avalanche photo diode (APD) is provided on the other end of the insulating tube. A ground voltage is applied to the envelope and a positive high voltage is applied to the APD. Photoelectrons which are emitted in response to an incident light on a photocathode are converged by an electrical field in the envelope and enter the APD. Thereafter, the incident photoelectrons are amplified and detected. Since a positive high voltage is not exposed to the envelope, the electron tube can easily be handled and is excellent in safety.
    Type: Application
    Filed: September 9, 2004
    Publication date: February 8, 2007
    Applicant: Hamamatsu Photonics K.K.
    Inventors: Motohiro Suyama, Hiroyuki Kyushima, Suenori Kimura, Yasuharu Negi, Atsuhito Fukasawa, Yoshihiko Kawai, Atshushi Uchiyama, Yasuyuki Egawa
  • Publication number: 20070023652
    Abstract: An insulating tube has one end and another end. An An avalanche photodiode (APD) is provided outside the one end of the insulating tube. The another end of the insulating tube is air-tightly connected to an outer flange through a stem inner wall. Capacitors electrically connected to the APD are provided in the insulating tube. The capacitors remove direct current components from signals that the APD generates when detecting electrons. By providing the capacitors in the insulating tube, response of output signals can be prevented from being impaired.
    Type: Application
    Filed: September 9, 2004
    Publication date: February 1, 2007
    Applicant: Hamamatsu Photonics K.K.
    Inventors: Hiroyuki Kyushima, Motohiro Suyama, Suenori Kimura, Yasuharu Negi, Yoshihiko Kawai, Atsuhito Fukasawa
  • Publication number: 20070001093
    Abstract: In an electron tube, one end of an insulating tube is protruded toward the inside of an envelope, and an avalanche photodiode (APD) is provided on the one end of the insulating tube. Another end of the insulating tube is connected to an outer stem of the envelope. Alkali sources are provided inside the envelope. The alkali sources are disposed inside the envelope and generates alkali metal vapor to thereby form a photocathode on a predetermined part of the internal surface of the envelope. The alkali sources and insulating tube are isolated from each other by a separating member. When the electron tube is manufactured, the alkali metal vapor that is generated from the alkali sources is not deposited on the insulating tube due to existence of the separating member. This prevents voltage resistance between the envelope and APD from being decreased and the electrical field in the electron tube from being adversely affected, thereby preventing incident efficiency of electrons to the APD from being decreased.
    Type: Application
    Filed: September 9, 2004
    Publication date: January 4, 2007
    Applicant: Hamamatsu Photonics K.K
    Inventors: Motohiro Suyama, Hiroyuki Kyushima, Yasuharu Negi, Atsuhito Fukasawa, Yoshihiko Kawai, Yasuyuki Egawa, Atsushi Uchiyama, Suenori Kimura
  • Publication number: 20060267493
    Abstract: A photocathode is formed on a predetermined portion of the internal surface of an envelope of an electric tube. An avalanche photodiode (APD) is provided inside the envelope. The APD is surrounded by a cover and a tubular inner wall. A manganese bead and an antimony bead serving as evaporation sources are disposed in the vicinity outside the inner wall. The manganese bead and the antimony bead are surrounded by a tubular outer wall. The manganese bead and the antimony bead generate metal vapor to thereby form the photocathode. In forming the photocathode, the cover, inner wall, outer wall prevent the metal vapor from being deposited on the APD or an unintended portion inside the electron tube.
    Type: Application
    Filed: September 9, 2004
    Publication date: November 30, 2006
    Applicant: Hamamatsu Photonics K.K.
    Inventors: Yasuharu Negi, Atsushi Uchiyama, Yasuyuki Egawa, Hiroyuki Kyushima, Suenori Kimura, Motohiro Suyama
  • Patent number: 7002132
    Abstract: The invention relates to a photocathode and the like having such structure for holding a photocathode plate on a light transparent member with good reliability and workability. In the photocathode, claw portions of a holding member fixed to the light transparent member is pressed against the lower surface of a supporting plate so that a photocathode plate is sandwiched between the light transparent member and the supporting plate. Thus, the supporting plate is pressed against the photocathode plate, so that the photocathode plate is pressed against the light transparent plate by the supporting plate. This allows the photocathode plate to be held reliably by the light transparent member. This simple configuration further provides good workability in assembling.
    Type: Grant
    Filed: November 12, 2003
    Date of Patent: February 21, 2006
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Yasuharu Negi, Yasuyuki Egawa, Toru Hirohata, Minoru Niigaki
  • Patent number: 6818885
    Abstract: The invention relates to a photodetector capable of detecting even weak light with precision and having a structure permitting size reduction. In the photoelectric tube, a photoelectric tube is cooled down starting from a light receiving faceplate side via a supporting protrusion piece of a heat conductive supporting member fixed to the heat absorbing portion of a cooling device by the heat absorbing operation of the cooling device. At this time, the photoelectric tube is fixed only to the supporting protrusion piece, so that heat inflow through other members is prevented. Thus, the photoelectric surface is efficiently cooled down through the light receiving faceplate by the cooling device serving as a cooling source, so that a stable cooling temperature is obtained. This suppresses the emission of thermal electrons from the photoelectric surface, and hence sufficiently suppresses the occurrence of noise in the photoelectric tube.
    Type: Grant
    Filed: November 7, 2003
    Date of Patent: November 16, 2004
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Yasuharu Negi, Toru Hirohata
  • Publication number: 20040135071
    Abstract: The invention relates to a photodetector capable of detecting even weak light with precision and having a structure permitting size reduction. In the photoelectric tube, a photoelectric tube is cooled down starting from a light receiving faceplate side via a supporting protrusion piece of a heat conductive supporting member fixed to the heat absorbing portion of a cooling device by the heat absorbing operation of the cooling device. At this time, the photoelectric tube is fixed only to the supporting protrusion piece, so that heat inflow through other members is prevented. Thus, the photoelectric surface is efficiently cooled down through the light receiving faceplate by the cooling device serving as a cooling source, so that a stable cooling temperature is obtained. This suppresses the emission of thermal electrons from the photoelectric surface, and hence sufficiently suppresses the occurrence of noise in the photoelectric tube.
    Type: Application
    Filed: November 7, 2003
    Publication date: July 15, 2004
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Yasuharu Negi, Toru Hirohata
  • Publication number: 20040094694
    Abstract: The invention relates to a photocathode and the like having such structure for holding a photocathode plate on a light transparent member with good reliability and workability. In the photocathode, claw portions of a holding member fixed to the light transparent member is pressed against the lower surface of a supporting plate so that a photocathode plate is sandwiched between the light transparent member and the supporting plate. Thus, the supporting plate is pressed against the photocathode plate, so that the photocathode plate is pressed against the light transparent plate by the supporting plate. This allows the photocathode plate to be held reliably by the light transparent member. This simple configuration further provides good workability in assembling.
    Type: Application
    Filed: November 12, 2003
    Publication date: May 20, 2004
    Applicant: Hamamatsu PHOTONICS K.K.
    Inventors: Yasuharu Negi, Yasuyuki Egawa, Toru Hirohata, Minoru Niigaki
  • Patent number: 6020684
    Abstract: To provide an electron tube having good airtightness and being appropriate for mass production, indium affixed to the inner surface of a sealing metal support member is provided between a side tube and input faceplate. The input faceplate is pushed against the side tube. As a result, the indium is squeezed by a pressure receiving surface provided on the end face of the side tube. Since the pressure receiving surface is in a generally declining shape from the inside out, the force of the pressing surface causes the indium to flow outward toward the sealing metal support member. Therefore, the indium is firmly affixed to the pressure receiving surface, and the side tube and input faceplate can be reliably sealed by the indium.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: February 1, 2000
    Assignee: Hamamatsu Photonics K,K,
    Inventors: Yasuharu Negi, Toshimitsu Nagai, Atsushi Kibune, Yutaka Hasegawa, Shigeru Ichikawa, Hitoshi Kishita, Norio Asakura, Motohiro Suyama
  • Patent number: 6008579
    Abstract: An electron tube in which a side tube and a faceplate are sealed together using a malleable metal with a low melting point. The metal is made to spread out along the outer surface of the faceplate due to pressure from a first sealing portion of a sealing metal support member and along the peripheral surface of the electron tube due to pressure from a second sealing portion of the sealing metal support member. Accordingly, the outer side of the corner portion formed by the faceplate and the side tube is covered with the metal. This construction not only reliably secures the input faceplate to the side tube, but also is extremely effective in preserving the airtightness of the electron tube. Since the first sealing portion is pressed toward the faceplate, an appropriate pressure can be applied to the metal interposed between the first sealing portion and the faceplate, improving the sealability of the metal against the faceplate and the first sealing portion.
    Type: Grant
    Filed: February 20, 1998
    Date of Patent: December 28, 1999
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Yasuharu Negi, Norio Asakura, Motohiro Suyama, Toshimitsu Nagai
  • Patent number: 5471051
    Abstract: There is disclosed a photocathode comprising:a photoelectric conversion layer for internally exciting photoelectrons in response to incident photons; a semiconductor layer having a photoelectron emission surface for emitting the photoelectrons generated and accelerated in the photoelectric conversion layer from the photoelectron emission surface; an upper surface electrode formed on the photoelectron emission surface of the semiconductor layer; and a lower surface electrode formed on the semiconductor layer so that the lower surface electrode is opposite to the upper surface electrode through the semiconductor layer, the upper surface electrode being divided so as to provide a plurality of pixel electrodes which are electrically insulated from each other, the plurality of pixel electrodes being respectively connected to a plurarity of bias application wires.
    Type: Grant
    Filed: June 1, 1994
    Date of Patent: November 28, 1995
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Minoru Niigaki, Katsuyuki Kinoshita, Toru Hirohata, Tuneo Ihara, Masami Yamada, Norio Asakura, Yasuharu Negi, Tomoko Suzuki
  • Patent number: 5336902
    Abstract: This invention relates to a semiconductor photo-electron-emitting device for emitting photoelectrons excited from the valence band to the conduction band by incident photons on a semiconductor layer. The device includes a Schottky electrode formed on the emitting surface on a surface of the semiconductor layer, and a conductor layer formed on a surface opposite to the emitting surface. A set bias voltage is applied between the Schottky electrode and the conductor layer to accelerate photoelectrons generated by the excitation of incident photons to the emitting surface and to transfer the accelerated photoelectrons from an energy band of a smaller effective mass to an energy band of a larger effective mass.
    Type: Grant
    Filed: October 5, 1992
    Date of Patent: August 9, 1994
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Minoru Nigaki, Tuneo Ihara, Toru Hirohata, Tomoko Suzuki, Kimitsugu Nakamura, Norio Asakura, Masami Yamada, Yasuharu Negi, Tomihiko Kuroyanagi, Yoshihiko Mizushima