Patents by Inventor Ryoji Fujiwara

Ryoji 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).

  • Publication number: 20080278059
    Abstract: An electron-emitting device of the present invention has an electron-emitting film, and the electron-emitting film is composed of a first layer made of a first material, and a plurality of particles made of a second material whose electric resistivity is lower than that of the first material and provided into the first layer. The first material contains oxygen and nitrogen. A method for manufacturing the electron-emitting device according to the present invention has a step of forming the electron-emitting film, and the electron-emitting film forming step includes a step of forming the plurality of particles made of a second material whose electric resistivity is lower than that of a first material into the first layer made of the first material containing oxygen and nitrogen.
    Type: Application
    Filed: May 2, 2008
    Publication date: November 13, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Shunsuke Murakami, Ryoji Fujiwara, Noriaki Oguri, Yasushi Shimizu
  • Patent number: 7400099
    Abstract: A flat panel image display device includes a rear plate including plural electron emission elements, a face plate disposed opposed to the rear plate, fluorescent members being disposed on a surface of the face plate opposed to the rear plate, and the fluorescent members being covered with a metal back film, and a voltage applying unit to apply an acceleration voltage of 8 kV to 15 kV between the rear plate and the face plate. In addition, the metal back film has a getter material, and a current luminance characteristic of the fluorescent member satisfies ??0.9 if L=kl? , wherein L is luminance, l is an irradiation current, and k is a constant.
    Type: Grant
    Filed: May 11, 2007
    Date of Patent: July 15, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuji Kasanuki, Shoshiro Saruta, Daisuke Sasaguri, Ryoji Fujiwara
  • Publication number: 20080070468
    Abstract: There is provided an electron-emitting device of a field emission type, with which the spot size of an electron beam is small, an electron emission area is large, highly efficient electron emission is possible with a low voltage, and the manufacturing process is easy. The electron-emitting device includes a layer 2 which is electrically connected to a cathode electrode 5, and a plurality of particles 3 which contains a material having a resistivity lower than that of a material constituting the layer 2, and is wherein a density of particles 3 in the layer 2 is 1×1014/cm3 or more and 5×1018/cm3 or less.
    Type: Application
    Filed: November 9, 2007
    Publication date: March 20, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: TAKESHI ICHIKAWA, Ryoji Fujiwara, Daisuke Sasaguri
  • Publication number: 20080012463
    Abstract: An electron emission device is provided which has sufficient on/off characteristics and is capable of efficiently emitting electrons with a low voltage. An electron emission device includes a substrate, a cathode electrode, a gate electrode, which are arranged on the substrate, an insulation layer covering the surface of the cathode electrode, and a dipole layer formed by terminating the surface of the insulation layer with hydrogen.
    Type: Application
    Filed: July 18, 2007
    Publication date: January 17, 2008
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Ryoji Fujiwara, Yoji Teramoto
  • Publication number: 20070267657
    Abstract: A flat panel image display device comprises: a rear plate including plural electron emission elements; a face plate disposed opposed to the rear plate, fluorescent members being disposed on a surface of the face plate opposed to the rear plate, and the fluorescent members being covered with a metal back film; and a voltage applying unit to apply an acceleration voltage of 8 kV to 15 kV between the rear plate and the face plate, wherein the metal back film has a getter material, and a current luminance characteristic of the fluorescent member satisfies ??0.9 if L=kl? (L is luminance, l is an irradiation current, and k is a constant). Thus, a high contrast can be acquired even if electrons scattered backward again bombard and penetrate into the fluorescent member.
    Type: Application
    Filed: May 11, 2007
    Publication date: November 22, 2007
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yuji Kasanuki, Shoshiro Saruta, Daisuke Sasaguri, Ryoji Fujiwara
  • Patent number: 7259520
    Abstract: An electron emission device is provided which has sufficient on/off characteristics and is capable of efficiently emitting electrons with a low voltage. An electron emission device includes a substrate, a cathode electrode, a gate electrode, which are arranged on the substrate, an insulation layer covering the surface of the cathode electrode, and a dipole layer formed by terminating the surface of the insulation layer with hydrogen.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: August 21, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryoji Fujiwara, Yoji Teramoto
  • Patent number: 7109663
    Abstract: An electron emission device is provided which has sufficient on/off characteristics and is capable of efficiently emitting electrons with a low voltage. An electron emission device includes a substrate, a cathode electrode, a gate electrode, which are arranged on the substrate, an insulation layer covering the surface of the cathode electrode, and a dipole layer formed by terminating the surface of the insulation layer with hydrogen.
    Type: Grant
    Filed: May 26, 2004
    Date of Patent: September 19, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryoji Fujiwara, Yoji Teramoto
  • Publication number: 20060125370
    Abstract: The invention is to provide a producing method for an electron emitting device of field emission type, having sufficient on/off characteristics and capable of efficient electron emission at a low voltage. There is provided a producing method for an electron emitting device including steps of preparing a plurality of electroconductive particles each covered with an insulation material having a thickness of 10 nm or less at least on a part of a surface of the particle, and forming a dipole layer on a surface of the insulation material covering each of the plurality of electroconductive particles.
    Type: Application
    Filed: December 8, 2005
    Publication date: June 15, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Michiyo Nishimura, Yoji Teramoto, Ryoji Fujiwara
  • Publication number: 20060066199
    Abstract: There is provided an electron-emitting device of a field emission type, with which the spot size of an electron beam is small, an electron emission area is large, highly efficient electron emission is possible with a low voltage, and a manufacturing process is easy. The electron-emitting device includes a layer 2 which is electrically connected to a cathode electrode 5, and a plurality of particles 3 which contains a material having resistivity lower than that of a material constituting the layer 2, and is wherein a density of particles 3 in the layer 2 is 1×1014/cm3 or more and 5×1018/cm3 or less.
    Type: Application
    Filed: June 13, 2003
    Publication date: March 30, 2006
    Applicant: Canon Kabushiki Kaisha
    Inventors: Takeshi Ichikawa, Ryoji Fujiwara, Daisuke Sasaguri
  • Publication number: 20060061289
    Abstract: An electron emission device is provided which has sufficient on/off characteristics and is capable of efficiently emitting electrons with a low voltage. An electron emission device includes a substrate, a cathode electrode, a gate electrode, which are arranged on the substrate, an insulation layer covering the surface of the cathode electrode, and a dipole layer formed by terminating the surface of the insulation layer with hydrogen.
    Type: Application
    Filed: November 1, 2005
    Publication date: March 23, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Ryoji Fujiwara, Yoji Teramoto
  • Publication number: 20040251812
    Abstract: An electron emission device is provided which has sufficient on/off characteristics and is capable of efficiently emitting electrons with a low voltage. An electron emission device includes a substrate, a cathode electrode, a gate electrode, which are arranged on the substrate, an insulation layer covering the surface of the cathode electrode, and a dipole layer formed by terminating the surface of the insulation layer with hydrogen.
    Type: Application
    Filed: May 26, 2004
    Publication date: December 16, 2004
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Ryoji Fujiwara, Yoji Teramoto
  • Patent number: 6106906
    Abstract: A material for forming an electroconductive film on a substrate comprises a metal and hydrophobic and hydrophilic components. Preferably, the material comprises an organometallic complex expressed by general formula (R.sup.1 COO).sub.n M(NR.sup.2 R.sup.3 R.sup.4).sub.m wherein R.sup.1 represents an alkyl group, each of R.sup.2, R.sup.3 and R.sup.4 represents a hydrogen atom, an alkyl group or an alkenyl group, M represents a metal element and each of n and m represents an integer equal to or greater than 1. The material can be used for forming an electroconductive film of an electron-emitting device or forming a liquid crystal alignment film.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: August 22, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroshi Matsuda, Ryoji Fujiwara
  • Patent number: 5838410
    Abstract: An optical modulation element, in which a pixel surrounding a ferroelectric liquid crystal layer and an column shaped orientation layer is formed between a pair of electrodes. The orientation layer is formed by a high-molecular polymer in which an ultrafine granular conductive substance may be dispersed. External voltage applied across the electrodes in response to gradation signals performs gradation drivings.
    Type: Grant
    Filed: April 7, 1994
    Date of Patent: November 17, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryoji Fujiwara, Shuzo Kaneko, Akio Maruyama, Tomoko Maruyama, Tomoko Murakami
  • Patent number: 5675351
    Abstract: An active matrix liquid crystal device is driven by sequentially applying a first scanning pulse to reset each pixel on a first selected line, a second scanning pulse to write each pixel on a second selected line and a third scanning pulse to provide a voltage signal which is equal to or less than the optical threshold value of the liquid crystal to each pixel on a third selected line. According to the driving method, the first, second and third selected lines are spaced at a predetermined number of lines from each other, and a sum of time integrated values of the applied voltage signals is or approaches zero.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 7, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shuzo Kaneko, Akio Yoshida, Ryoji Fujiwara
  • Patent number: 5479283
    Abstract: A liquid crystal element includes a liquid crystal exhibiting spontaneous polarization, a pair of electrode substrates for sandwiching the liquid crystal therebetween, and insulating layers formed between the electrode substrates and the liquid crystal. A spontaneous polarization P.sub.s value, in nC/cm.sup.2, of the liquid crystal, an interelectrode composite capacitance Ci, in nF/cm.sup.
    Type: Grant
    Filed: October 11, 1994
    Date of Patent: December 26, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shuzo Kaneko, Ryoji Fujiwara, Akio Yoshida, Tomoko Maruyama
  • Patent number: 5475515
    Abstract: The liquid crystal device is constituted by disposing a display layer between a pair of electrode plates. The display layer comprises a stretched porous polymer film having open pores and a low-molecular weight mesomorphic compound impregnating the polymer film. The display layer further comprises a porous polymer film having a three dimensional network structure characterized by a fibril diameter of at most 0.3 micron, and a low-molecular weight mesomorphic compound impregnating the polymer film. The display layer still further comprises a first display layer comprising a porous film and a low-molecular weight mesomorphic compound impregnating the porous film, and a second display layer comprising the low-molecular weight mesomorphic compound.
    Type: Grant
    Filed: April 25, 1994
    Date of Patent: December 12, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kazuo Yoshinaga, Ryoji Fujiwara, Yomishi Toshida, Toshikazu Ohnishi, Koichi Sato, Takeo Eguchi, Tsuyoshi Shibata
  • Patent number: 5396352
    Abstract: Disclosed is a liquid crystal apparatus including a liquid crystal panel having a pair of electrodes and a liquid crystal exhibiting spontaneous polarization and arranged between the pair of electrodes, first means for applying a gradation voltage signal corresponding to gradation information to the pair of electrodes, and second means for applying, a DC component serving as a reverse bias of an internal electric field generated upon application of the gradation voltage signal, to the liquid crystal during one vertical scanning period.
    Type: Grant
    Filed: August 16, 1991
    Date of Patent: March 7, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shuzo Kaneko, Ryoji Fujiwara, Akio Yoshida, Tomoro Maruyama
  • Patent number: 5327272
    Abstract: An optical modulation element, in which a pixel surrounding a ferroelectric liquid crystal layer and an column shaped orientation layer is formed between a pair of electrodes. The orientation layer is formed by a high-molecular polymer in which an ultrafine granular conductive substance may be dispersed. External voltage applied across the electrodes in response to gradation signals performs gradation drivings.
    Type: Grant
    Filed: March 25, 1992
    Date of Patent: July 5, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryoji Fujiwara, Shuzo Kaneko, Akio Maruyama, Tomoko Maruyama, Tomoko Murakami
  • Patent number: 5321538
    Abstract: A liquid crystal optical element comprising a pair of electrode substrates having an electrode and a substrate and a chiral smectic liquid crystal disposed between said pair of electrode substrates, wherein an electrode on at least one of said pair of electrode substrates is provided regularly or randomly with minute insulation portions.
    Type: Grant
    Filed: September 1, 1993
    Date of Patent: June 14, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomoko Maruyama, Shuzo Kaneko, Ryoji Fujiwara, Tomoko Murakami
  • Patent number: 5270844
    Abstract: A liquid crystal optical element comprising a pair of electrode substrates having an electrode and a substrate and a chiral smectic liquid crystal disposed between said pair of electrode substrates, wherein an electrode on at least one of said pair of electrode substrates is provided regularly or randomly with minute insulation portions.
    Type: Grant
    Filed: December 3, 1992
    Date of Patent: December 14, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomoko Maruyama, Shuzo Kaneko, Ryoji Fujiwara, Tomoko Murakami