Patents by Inventor Shoichi Uchiyama

Shoichi Uchiyama 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: 20050104527
    Abstract: The transmission secondary electron emitter according to the present invention comprises a secondary electron emitting layer 1 made of diamond or a material containing diamond as a main component, a supporting frame 21 reinforcing the mechanical strength of the secondary electron emitting layer 1, a first electrode 31 formed on the surface of incidence of the secondary electron emitting layer 1, and a second electrode 32 formed on the surface of emission of the secondary electron emitting layer 1. A voltage is applied between the surfaces of the incidence and the emission of the secondary electron emitting layer 1 to form an electric field in the secondary electron emitting layer 1.
    Type: Application
    Filed: February 24, 2003
    Publication date: May 19, 2005
    Inventors: Minoru Niigaki, Shoichi Uchiyama, Hirofumi Kan
  • Publication number: 20050045866
    Abstract: Ultraviolet light incident from the side of a surface layer 5 passes through the surface layer 5 to reach an optical absorption layer 4. Light which reaches the optical absorption layer 4 is absorbed within the optical absorption layer 4, and photoelectrons are generated within the optical absorption layer 4. Photoelectrons diffuse within the optical absorption layer 4, and reach the interface between the optical absorption layer 4 and the surface layer 5. Because the energy band is curved in the vicinity of the interface between the optical absorption layer 4 and surface layer 5, the energy of the photoelectrons is larger than the electron affinity in the surface layer 5, and so photoelectrons are easily ejected to the outside. Here, the optical absorption layer 4 is formed from an Al0.3Ga0.7N layer with an Mg content concentration of not less than 2×1019 cm?3 but not more than 1×1020 cm?3, so that a solar-blind type semiconductor photocathode 1 with high quantum efficiency is obtained.
    Type: Application
    Filed: October 12, 2004
    Publication date: March 3, 2005
    Inventors: Hirofumi Kan, Minoru Niigaki, Masashi Ohta, Yasufumi Takagi, Shoichi Uchiyama
  • Patent number: 6839178
    Abstract: The invention provides a method of producing a transmissive screen having a structure including light-absorption-material patterns that are formed on locations corresponding to locations of lens members, which are provided side by side on a light-transmissive substrate, and to locations of boundary portions between the corresponding lens members. In this method, lens compositions are discharged onto and are caused to land on the light transmissive substrate, and, by drops of the lens compositions, very small lens members or precursors thereof are formed. It is possible to provide a method of producing a transmissive screen, which makes it possible to realize, at a low cost, a bright transmissive screen which has high contrast ratio and which can display a high-quality image having reduced or no moiré and reduced or no speckles.
    Type: Grant
    Filed: July 16, 2003
    Date of Patent: January 4, 2005
    Assignee: Seiko Epson Corporation
    Inventors: Shoichi Uchiyama, Satoru Miyashita, Hiroshi Kiguchi, Hironori Hasei
  • Patent number: 6831341
    Abstract: Ultraviolet light incident from the side of a surface layer 5 passes through the surface layer 5 to reach an optical absorption layer 4. Light which reaches the optical absorption layer 4 is absorbed within the optical absorption layer 4, and photoelectrons are generated within the optical absorption layer 4. Photoelectrons diffuse within the optical absorption layer 4, and reach the interface between the optical absorption layer 4 and the surface layer 5. Because the energy band is curved in the vicinity of the interface between the optical absorption layer 4 and surface layer 5, the energy of the photoelectrons is larger than the electron affinity in the surface layer 5, and so photoelectrons are easily ejected to the outside. Here, the optical absorption layer 4 is formed from an Al0.3Ga0.
    Type: Grant
    Filed: May 14, 2003
    Date of Patent: December 14, 2004
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Hirofumi Kan, Minoru Niigaki, Masashi Ohta, Yasufumi Takagi, Shoichi Uchiyama
  • Publication number: 20040129891
    Abstract: The present invention relates to an illuminant, etc., having a high response speed and a high luminous intensity. The illuminant comprises a substrate and a nitride semiconductor layer provided on one surface of the substrate. The nitride semiconductor layer emits fluorescence in response to incidence of electrons. At least part of the emitted fluorescence passes through the substrate, and then exits from the other surface of the substrate. Generation of the fluorescence is caused by incidence of electrons onto a quantum well structure of the nitride semiconductor layer and recombination of pairs of electrons and holes generated due to electron incidence, and the response speed of fluorescence generation is on the order of nanoseconds or less. Also, the luminous intensity of the fluorescence becomes equivalent to that of a conventional P47 fluorescent substance.
    Type: Application
    Filed: October 7, 2003
    Publication date: July 8, 2004
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Yasufumi Takagi, Minoru Niigaki, Shoichi Uchiyama, Minoru Kondo, Itaru Mizuno
  • Publication number: 20040021417
    Abstract: Ultraviolet light incident from the side of a surface layer 5 passes through the surface layer 5 to reach an optical absorption layer 4. Light which reaches the optical absorption layer 4 is absorbed within the optical absorption layer 4, and photoelectrons are generated within the optical absorption layer 4. Photoelectrons diffuse within the optical absorption layer 4, and reach the interface between the optical absorption layer 4 and the surface layer 5. Because the energy band is curved in the vicinity of the interface between the optical absorption layer 4 and surface layer 5, the energy of the photoelectrons is larger than the electron affinity in the surface layer 5, and so photoelectrons are easily ejected to the outside. Here, the optical absorption layer 4 is formed from an Al0.3Ga0.
    Type: Application
    Filed: May 14, 2003
    Publication date: February 5, 2004
    Inventors: Hirofumi Kan, Minoru Niigaki, Masashi Ohta, Yasufumi Takagi, Shoichi Uchiyama
  • Publication number: 20040012857
    Abstract: The invention provides a method of producing a transmissive screen having a structure including light-absorption-material patterns that are formed on locations corresponding to locations of lens members, which are provided side by side on a light-transmissive substrate, and to locations of boundary portions between the corresponding lens members. In this method, lens compositions are discharged onto and are caused to land on the light transmissive substrate, and, by drops of the lens compositions, very small lens members or precursors thereof are formed. It is possible to provide a method of producing a transmissive screen, which makes it possible to realize, at a low cost, a bright transmissive screen which has high contrast ratio and which can display a high-quality image having reduced or no moiré and reduced or no speckles.
    Type: Application
    Filed: July 16, 2003
    Publication date: January 22, 2004
    Applicant: Seiko Epson Corporation
    Inventors: Shoichi Uchiyama, Satoru Miyashita, Hiroshi Kiguchi, Hironori Hasei
  • Patent number: 6621637
    Abstract: A method of producing a transmissive screen having a structure including light-absorption-material patterns formed on locations corresponding to locations of lens members, which are provided side by side on a light-transmissive substrate, and to locations of boundary portions between the corresponding lens members. In the method, lens compositions are discharged onto and are caused to land on the light transmissive substrate, and, by drops of the lens compositions, very small lens members or precursors thereof are formed. It is possible to provide a method of producing a transmissive screen, which makes it possible to realize at a low cost a bright transmissive screen which has high contrast ratio and which can display a high-quality image having no moiré and no speckles.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: September 16, 2003
    Assignee: Seiko Epson Corporation
    Inventors: Shoichi Uchiyama, Satoru Miyashita, Hiroshi Kiguchi, Hironori Hasei
  • Publication number: 20030086265
    Abstract: A lighting apparatus used for a projection type display is provided, which can change the incident ray volume to an optical modulation device without changing the optical output intensity of the lamp, and can exhibit excellent effects in expressive power of an image and adaptability to the use environment. The lighting apparatus of the present invention comprises; a light source, two fly-eye lenses constituting a uniform lighting device, and a shading plate arranged between these fly-eye lenses and constituting a dimming device for adjusting the amount of light of the outgoing light from the light source. The angle of inclination of the shading plate is controlled based on an image signal supplied to the optical modulation device, thereby enabling adjustment of the amount of light.
    Type: Application
    Filed: October 4, 2002
    Publication date: May 8, 2003
    Applicant: SEIKO EPSON CORPORATION
    Inventors: Hidehito Ilsaka, Shoichi Uchiyama
  • Patent number: 6538624
    Abstract: In a head-mounted image display apparatus (1) for viewing images on a liquid crystal display means virtually enlarged by an enlarging lens while worn on the head, main apparatus (10) comprises a front case (2), which is positioned at the frontal region side when said main apparatus is worn on the head, and a back case (3), which is positioned at the occipital region. In addition, an air bag (8), which inflates to cause the frontal region to contact a buffer pad affixed to the inside surface of the front case (2), is provided on the inside of the back case (3). The back case (3) is able to rotate on connecting member 5 to the front case (2). Adjustment mechanisms for moving the optical system in the pupil distance direction and in the direction of the optical axes is disposed inside main apparatus (10), and the knobs therefor are centrally disposed on the front of main apparatus (10).
    Type: Grant
    Filed: April 12, 2000
    Date of Patent: March 25, 2003
    Assignee: Seiko Epson Corporation
    Inventors: Joji Karasawa, Shoichi Ishizawa, Shoichi Uchiyama, Yoko Miyazawa
  • Publication number: 20030001498
    Abstract: In the polycrystal diamond thin film in accordance with the present invention, the average particle size is at least 1.5 &mgr;m and, in a Raman spectrum obtained by Raman spectroscopy, a peak intensity near a wave number of 1580 cm−1 has a ratio of 0.2 or less with respect to a peak intensity near a wave number of 1335 cm−1. The photocathode and electron tube in accordance with the present invention comprise the polycrystal diamond thin film as a light-absorbing layer.
    Type: Application
    Filed: August 20, 2002
    Publication date: January 2, 2003
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Minoru Niigaki, Shoichi Uchiyama, Hirofumi Kan
  • Publication number: 20020149709
    Abstract: A method of producing a transmissive screen having a structure including light-absorption-material patterns formed on locations corresponding to locations of lens members, which are provided side by side on a light-transmissive substrate, and to locations of boundary portions between the corresponding lens members. In the method, lens compositions are discharged onto and are caused to land on the light transmissive substrate, and, by drops of the lens compositions, very small lens members or precursors thereof are formed. It is possible to provide a method of producing a transmissive screen, which makes it possible to realize at a low cost a bright transmissive screen which has high contrast ratio and which can display a high-quality image having no moiré and no speckles.
    Type: Application
    Filed: February 28, 2002
    Publication date: October 17, 2002
    Inventors: Shoichi Uchiyama, Satoru Miyashita, Hiroshi Kiguchi, Hironori Hasei
  • Patent number: 5739797
    Abstract: A head-mounted display device for enlarging an image formed by an image display element as a virtual image. The head-mounted display device according to this invention comprises a virtual image forming optical system (3) including an image display element (9) and a lens (11) for enlarging an image formed by the image display element (9); a device main body (1) that houses the image forming optical means (3); and a switching means mounted in the device main body (1) for holding the virtual image forming optical system (3) in such a way that the system (3) can be moved in the direction of the width of the eye and placing the virtual image forming optical system (3) in front of one of the user's eyes. The image display element (9) and the lens (11) are disposed so that the optical axis of the virtual image forming optical system (3) approximately aligns with the user's line of sight taken while he or she is looking horizontally.
    Type: Grant
    Filed: January 22, 1996
    Date of Patent: April 14, 1998
    Assignee: Seiko Epson Corporation
    Inventors: Joji Karasawa, Hiroshi Kamakura, Shoichi Uchiyama, Hiroyuki Shindo, Takeshi Furihata, Masafumi Sakaguchi
  • Patent number: 5739893
    Abstract: In a head-mounted image display apparatus (1) for viewing images on a liquid crystal display means virtually enlarged by an enlarging lens while worn on the head, main apparatus (10) comprises a front case (2), which is positioned at the frontal region side when said main apparatus is worn on the head, and a back case (3), which is positioned at the occipital region. In addition, an air bag (8), which inflates to cause the frontal region to contact a buffer pad affixed to the inside surface of the front case (2), is provided on the inside of the back case (3). The back case (3) is able to rotate on connecting member 5 to the front case (2). Adjustment mechanisms for moving the optical system in the pupil distance direction and in the direction of the optical axes is disposed inside main apparatus (10), and the knobs therefor are centrally disposed on the front of main apparatus (10).
    Type: Grant
    Filed: June 22, 1995
    Date of Patent: April 14, 1998
    Assignee: Seiko Epson Corporation
    Inventors: Joji Karasawa, Shoichi Ishizawa, Shoichi Uchiyama, Yoko Miyazawa
  • Patent number: 5510588
    Abstract: An image intensifier apparatus of this invention comprises a photocathode for converting a first optical image to corresponding photoelectrons, a microchannel plate for multiplying the photoelectrons, impressed with a voltage at both ends thereof, and a fluorescent screen for converting the photoelectrons multiplied in the microchannel plate to a second optical image, emitting the second optical image to an image pickup device. Resistance of the microchannel plate is greater than or equal to 2.8.times.10.sup.15 G.OMEGA. and less than or equal to 2.8.times.10.sup.16 G.OMEGA. per channel.
    Type: Grant
    Filed: April 4, 1994
    Date of Patent: April 23, 1996
    Assignee: Hamamatsu Photonics K.K.
    Inventors: Hideki Suzuki, Shoichi Uchiyama
  • Patent number: 5440424
    Abstract: A polarizer optical device for receiving and transmitting light is provided. The polarizer optical device includes a light separating section for separating the light into two polarization components which are othogonal with respect to one another. Further, the optical device is provided with a polarization rotating section for rotating the two polarization components so that a phase difference between the two polarization components othogonal to each other is 1/2.lambda.. Finally, a light combining section is provided for combining the light into a outputted light beam. The light combining section may be formed with a combination of birefringent prisms and isotropic mediums interfacing one another. In these configurations, the refractive index of each prism or medium is selected so that an angle formed with two unparallel incident lights differs from an angle formed with two output or transmitted lights.
    Type: Grant
    Filed: February 18, 1993
    Date of Patent: August 8, 1995
    Assignee: Seiko Epson
    Inventors: Jin-Jei Wu, Shoichi Uchiyama, Yoshitaka Itoh, Tomio Sonehara
  • Patent number: 5161040
    Abstract: An optical system, that includes a light source having sufficient coherency to provide a predominate operating wavelength and a diffraction grating lens system to focus the light from the light source to an image point on the optical axis of the optical system, provides for change of position of the image point along the optical axis over a wide focusing range with suppression of generated aberration. In particular, the optical system comprises a light source both movable in the direction of the optical axis and capable of variation in wavelength and a diffraction grating lens system that condenses the beam from the light source onto an image point on and along the optical axis, which system is effective in cancelling out aberration generated due to movement of the light source.
    Type: Grant
    Filed: January 29, 1990
    Date of Patent: November 3, 1992
    Assignee: Seiko Epson Corporation
    Inventors: Osamu Yokoyama, Shoichi Uchiyama