Patents by Inventor Yuji Nakayama

Yuji Nakayama 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: 20060202197
    Abstract: A platinum complex represented by the general formula 1, useful as a phosphorescence emission material, a tetradentate ligand useful for synthesizing the platinum complex, and a light-emitting device containing at least one of the platinum complex. In the general formula 1, two of the rings A, B, C, and D each independently represent an aromatic ring or an aromatic heterocyclic ring, while the other two rings each represent a nitrogen-containing heterocyclic ring; RA-D represent the substituents; each the rings A and B, the rings B and C, and the rings C and D may be bound to each other to form a fused ring independently via the substituent RA-D; XA-D each represent a carbon atom or nitrogen atom; Q represents a bivalent atom or atomic group; Y represents a carbon or nitrogen atom; and n is an integer of 0 to 3.
    Type: Application
    Filed: February 28, 2006
    Publication date: September 14, 2006
    Inventors: Yuji Nakayama, Hisanori Ito, Takeshi Iwata, Junji Nakamura, Yoshimasa Matsushima
  • Publication number: 20060094875
    Abstract: The invention aims at providing platinum complexes useful as materials for light emitting devices and extremely excellent in heat stability, luminous characteristics, and luminous efficiency, and a process for effective preparation thereof. The invention relates to platinum complexes represented by the general formula [1]: wherein any two of A, B and C are each independently an optionally substituted nitrogenous aromatic heterocyclic group and the other is optionally substituted aryl or optionally substituted heteroaryl; and Y is halogeno or an optionally substituted aryl or heteroaryl group which is bonded either directly or through oxygen (ā€”Oā€”) or sulfur (ā€”Sā€”) (with the proviso that when the adjacent two rings are nitrogenous aromatic heterocyclic groups, the cases wherein Y is chloro are excepted, while when the nonadjacent two rings are nitrogenous aromatic heterocyclic groups, the cases wherein Y is not halogeno are excepted).
    Type: Application
    Filed: October 17, 2003
    Publication date: May 4, 2006
    Inventors: Hisanori Itoh, Yuji Nakayama, Yoshimasa Matsushima, Yoji Hori
  • Publication number: 20050095809
    Abstract: A method and apparatus for forming a transparent electrode layer of a thin-film compound semiconductor solar cell by using only a direct-current sputtering system, wherein a preliminary layer is formed in a first process by direct-current sputtering from a target by supplying thereto a specified low electric power preset so as not to damage the substrate by sputters and a complete layer is deposited thereon in a second process by sputtering from the same target by supplying a high electric power. The same layer is also formed by direct-current sputtering from a pair of oppositely disposed targets of the same material. The method and apparatus are capable of easily forming a high quality transparent electrode layer at an increased speed.
    Type: Application
    Filed: July 12, 2002
    Publication date: May 5, 2005
    Inventors: Yuji Nakayama, Satoshi Shiozaki
  • Publication number: 20040240915
    Abstract: An image forming apparatus includes an image bearing member on which a toner image is formed and a blade retained so as to be capable of coming into contact with and separating from the image bearing member and adapted, when in contact with the image bearing member, to remove residual toner remaining on the image bearing member after image transfer, the blade being brought into contact with or separated from the image bearing member during movement of the image bearing member, wherein the blade includes an edge portion to be brought into contact with the image bearing member and a support portion causing the edge portion to come into contact with the image bearing member, and wherein the hardness of the edge portion is higher than the hardness of the support portion, the hardness of the edge portion being not less than 75 degrees but not more than 100 degrees (JIS-A), the hardness of the support portion being not less than 60 degrees but not more than 85 degrees (JIS-A).
    Type: Application
    Filed: May 24, 2004
    Publication date: December 2, 2004
    Applicant: Canon Kabushiki Kaisha
    Inventor: Yuji Nakayama
  • Patent number: 6805920
    Abstract: This invention provides a polymerizable liquid crystal compound having a large value of &Dgr;n/n, excellent in coating properties on an alignment film and easily aligned. Disclosed is a polymerizable liquid crystal compound having at least one polymerizable reactive group and showing nematic liquid crystal properties, having a &Dgr;n/n value of 0.14 or more wherein n is average refractive index and &Dgr;n is extraordinary light refractive index (ne) minus ordinary light refractive index (no), and being aligned by application onto an alignment film.
    Type: Grant
    Filed: April 11, 2002
    Date of Patent: October 19, 2004
    Assignees: Nitto Denko Corporation, Takasago International Corporation
    Inventors: Shusaku Nakano, Amane Mochizuki, Yukiharu Iwaya, Shinya Yamada, Tsutomu Hashimoto, Yuji Nakayama, Yoshiki Hasegawa, Ken Suzuki, Tohru Kobayashi
  • Publication number: 20040203967
    Abstract: A reception side radio station has a notification signal generator 108 which transmits a notification signal for notifying information of a frequency of a radio link being used at the radio station, and a transmitter 111 which transmits information indicating a reception power level and its frequency as radio signal data. On the other hand, a transmission side radio station has a notification signal measurer 106 which measures a reception power level of the notification signal and detects the frequency notified by the signal, and a frequency band controller 109 which determines an assignable frequency band for a radio link between the transmission side radio station and the reception side radio station based on the radio signal data and the notification signal.
    Type: Application
    Filed: March 5, 2003
    Publication date: October 14, 2004
    Applicant: NTT DoCoMo, Inc.
    Inventors: Koichiro Yamaguchi, Yuji Aburakawa, Yuji Nakayama, Toru Otsu
  • Patent number: 6704539
    Abstract: In a cleaning blade and an image-forming apparatus using a cleaning means having the cleaning blade, the cleaning blade is composed of an edge portion which is brought into contact with the image-bearing member and a support portion which brings the edge portion into contact with the image-bearing member, where the value at a peak temperature (t1) of a loss tangent of the edge portion, tan &dgr;1, is smaller than the value at a peak temperature (t2) of a loss tangent of the support portion, tan &dgr;2, and a curve which represents the temperature dependence of the loss tangent of the edge portion and a curve which represents the temperature dependence of the loss tangent of the support portion intersect at t1° C. or above to t1+40° C. or below.
    Type: Grant
    Filed: October 10, 2002
    Date of Patent: March 9, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuji Nakayama
  • Patent number: 6605405
    Abstract: Provided are an electrophotographic method and an electrophotographic apparatus that can reduce ghost memory latent in an a-Si photosensitive member, relieve potential unevenness, and provide image copies with high quality. In an electrophotographic process of forming a toner image at least through decharging of a photosensitive member as a recording element, charging, exposing, developing, and transferring, at least a light-receiving layer of the photosensitive member is comprised of an amorphous material; a latent image is formed by the exposing with a light; the light has such a peak wavelength in an emission spectrum as to make minimum a value of optical memory at a unit contrast potential; and the decharging is implemented by use of a light having a full width at half maximum of a peak in an emission spectrum of not more than 50 nm.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: August 12, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hironori Owaki, Toshiyuki Ehara, Yuji Nakayama, Masaya Kawada, Takaaki Kaya, Tetsuya Karaki
  • Patent number: 6560427
    Abstract: An image forming apparatus has a first image bearing body for bearing an image formed by a substantially spherical toner, transferring belt for transferring a toner image formed on the first image bearing body onto a second image bearing body, and a cleaning member, abutting on the first image forming body, for sweeping away the toner remaining on the first image bearing body after a transferring operation by the transferring belt, wherein the first image bearing body contains a fluororesin on its surface, a content ratio F (% by weight) of the fluororesin is in a range of 10≦F≦50, a surface roughness Rz (&mgr;m) of the first image bearing body is Rz<5.0, and a dynamic friction coefficient &mgr; between the first image bearing body and the cleaning member is in a range of 0.5≦&mgr;≦2.5.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: May 6, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Norihiko Kubo, Yuji Nakayama, Hisataka Hisakuni
  • Publication number: 20030081971
    Abstract: In a cleaning blade and an image-forming apparatus using a cleaning means having the cleaning blade, the cleaning blade is composed of an edge portion which is brought into contact with the image-bearing member and a support portion which brings the edge portion into contact with the image-bearing member, where the value at a peak temperature (t1) of a loss tangent of the edge portion, tan&dgr;1, is smaller than the value at a peak temperature (t2) of a loss tangent of the support portion, tan&dgr;2, and a curve which represents the temperature dependence of the loss tangent of the edge portion and a curve which represents the temperature dependence of the loss tangent of the support portion intersect at t1° C. or above to t1+40° C. or below.
    Type: Application
    Filed: October 10, 2002
    Publication date: May 1, 2003
    Applicant: Canon Kabushiki Kaisha
    Inventor: Yuji Nakayama
  • Patent number: 6556233
    Abstract: An electrophotographic apparatus has a light scanning device for guiding a light beam onto a rotary polygon mirror and deflecting the light beam; and a recording medium which the light beam deflected by the light scanning device scans to form an image. The recording medium is an a-Si base photosensitive member. The electrophotographic apparatus satisfies a relation represented by Eq. (I) below; 3.0≧D/W≧1.5  (I) where D is a diameter of the light beam at a reflecting surface of the rotary polygon mirror and W is a width in a main scanning direction of a deflecting surface of the rotary polygon mirror.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: April 29, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiyuki Ehara, Yuji Nakayama, Masaya Kawada, Hironori Owaki
  • Publication number: 20030072893
    Abstract: This invention provides a polymerizable liquid crystal compound having a large value of An/n, excellent in coating properties on an alignment film and easily aligned. Disclosed is a polymerizable liquid crystal compound having at least one polymerizable reactive group and showing nematic liquid crystal properties, having a &Dgr;n/n value of 0.14 or more wherein n is average refractive index and &Dgr;n is extraordinary light refractive index (ne) minus ordinary light refractive index (no), and being aligned by application onto an alignment film.
    Type: Application
    Filed: April 11, 2002
    Publication date: April 17, 2003
    Inventors: Shusaku Nakano, Amane Mochizuki, Yukiharu Iwaya, Shinya Yamada, Tsutomu Hashimoto, Yuji Nakayama, Yoshiki Hasegawa, Ken Suzuki, Tohru Kobayashi
  • Patent number: 6522856
    Abstract: An image forming apparatus provided with an image forming portion for forming an image by a developer, a bearing and conveying member capable of bearing thereon and conveying a transfer material on which the developer image is formed, or the developer image directly transferred thereto, and a cleaning portion for cleaning the bearing and conveying member, the cleaning portion has a cleaning blade abutting against the bearing and conveying member, and a holding member holding the cleaning blade and swingable about a rotary shaft, wherein the angle formed by a tangential line on the abutting portion of the cleaning blade against the bearing and conveying member with a line connecting the center of the rotary shaft and the abutting portion is designed to be equal to or greater than 0° and equal to or smaller than 15°, and the abrasion wear of the surface of the bearing and conveying member when in use of the apparatus, the bearing and conveying member has made 10,000 revolutions is designed to be equal t
    Type: Grant
    Filed: April 17, 2001
    Date of Patent: February 18, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuji Nakayama
  • Publication number: 20020051920
    Abstract: Provided are an electrophotographic method and an electrophotographic apparatus that can reduce ghost memory latent in an a-Si photosensitive member, relieve potential unevenness, and provide image copies with high quality. In an electrophotographic process of forming a toner image at least through decharging of a photosensitive member as a recording element, charging, exposing, developing, and transferring, at least a light-receiving layer of the photosensitive member is comprised of an amorphous material; a latent image is formed by the exposing with a light; the light has such a peak wavelength in an emission spectrum as to make minimum a value of optical memory at a unit contrast potential; and the decharging is implemented by use of a light having a full width at half maximum of a peak in an emission spectrum of not more than 50 nm.
    Type: Application
    Filed: July 25, 2001
    Publication date: May 2, 2002
    Inventors: Hironori Owaki, Toshiyuki Ehara, Yuji Nakayama, Masaya Kawada, Takaaki Kaya, Tetsuya Karaki
  • Publication number: 20020028100
    Abstract: An image forming apparatus is herein disclosed which comprises a first image bearing body for bearing an image formed by a substantially spherical toner, transferring means for transferring a toner image formed on the first image bearing body onto a second image bearing body, and a cleaning member, abutting on the first image forming body, for sweeping away the toner remaining on the first image bearing body after a transferring operation by the transferring means, wherein it is simultaneously satisfied that the first image forming body contains a fluororesin on its surface, a content ratio F (% by weight) of the fluororesin is in a range of 10≦F≦50, a surface roughness Rz (&mgr;m) of the first image bearing body is Rz<5.0, and a dynamic friction coefficient &mgr; between the first image bearing body and the cleaning member is in a range of 0.5≦&mgr;≦2.5.
    Type: Application
    Filed: August 30, 2001
    Publication date: March 7, 2002
    Inventors: Norihiko Kubo, Yuji Nakayama, Hisataka Hisakuni
  • Publication number: 20020009314
    Abstract: An image forming apparatus provided with an image forming portion for forming an image by a developer, a bearing and conveying member capable of bearing thereon and conveying a transfer material on which the developer image is formed, or the developer image directly transferred thereto, and a cleaning portion for cleaning the bearing and conveying member, the cleaning portion has a cleaning blade abutting against the bearing and conveying member, and a holding member holding the cleaning blade and swingable about a rotary shaft, wherein the angle formed by a tangential line on the abutting portion of the cleaning blade against the bearing and conveying member with a line connecting the center of the rotary shaft and the abutting portion is designed to be equal to or greater than 0° and equal to or smaller than 15°, and the abrasion wear of the surface of the bearing and conveying member when in use of the apparatus, the bearing and conveying member has made 10,000 revolutions is designed to be equal t
    Type: Application
    Filed: April 17, 2001
    Publication date: January 24, 2002
    Inventor: Yuji Nakayama
  • Patent number: 6330412
    Abstract: The present invention relates to an electrophotographic apparatus in which maximum potential difference &Dgr;VD (volt) in a potential of a dark portion of the electrostatic image in the longitudinal direction, maximum potential difference &Dgr;VL in a potential of a light portion of the electrostatic image in the longitudinal direction, a value a (1/volt) represented by (variation amount in density, in the longitudinal direction, in the image formed by developing the light portion with the developing means)/(the maximum potential difference &Dgr;VD) and a value b (1/volt) represented by (variation amount in density, in the longitudinal direction, in the image formed by developing the light portion with the developing means)/(the maximum potential difference &Dgr;VL) satisfy a relation: 0.3≦a×&Dgr;VD+b×&Dgr;VL≦0.3 in which 100≧|&Dgr;VD|≧20 and 100≧|&Dgr;VL|≧20.
    Type: Grant
    Filed: June 16, 2000
    Date of Patent: December 11, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji Yamazaki, Yuji Nakayama, Masaya Kawada, Hironori Ohwaki
  • Publication number: 20010040619
    Abstract: An electrophotographic apparatus has a light scanning device for guiding a light beam onto a rotary polygon mirror and deflecting the light beam; and a recording medium which the light beam deflected by the light scanning device scans to form an image. The recording medium is an a-Si base photosensitive member. The electrophotographic apparatus satisfies a relation represented by Eq.
    Type: Application
    Filed: September 13, 1999
    Publication date: November 15, 2001
    Inventors: TOSHIYUKI EHARA, YUJI NAKAYAMA, MASAYA KAWADA, HIRONORI OWAKI
  • Patent number: 6311037
    Abstract: An electrophotographic image forming apparatus includes an image-bearing member for bearing a toner image thereon, a transfer device for transferring the toner image from the image-bearing member to a recording medium at a transfer position, a drive mechanism for moving the image-bearing member, and a cleaning blade abutted against the image-bearing member for removing a transfer residual toner remaining on the image-bearing member after the transfer of the toner image to the recording medium in accordance with the movement of the image-bearing member. The image forming apparatus is operated effectively for a long period by cleaning the image-bearing member according to a method wherein cleaning aid particles having a volume-average particle size of 0.1-3 &mgr;m smaller than that of the toner are caused to be resident in a width of 50-100 &mgr;m along an upstream side of the cleaning blade with respect to the moving direction of the image-bearing member.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: October 30, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hisataka Hisakuni, Yuji Nakayama, Norihiko Kubo
  • Patent number: 6272335
    Abstract: In a wireless access system which uses the sector antenna of a radio base station to transmit an access channel to and receive an access channel from a radio terminal in each frame, and which switches the sector at each frame, the sector ID s is set in a specific functional relation to the access channel ID a, and a radio terminal which communicates with a radio base station transmits and receives in accordance with the access channel ID a without knowing the sector ID s.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: August 7, 2001
    Assignee: Nippon Telegraph and Telephone Corp.
    Inventors: Yuji Nakayama, Masahiko Itoh, Satoshi Kurosaki, Satoru Aikawa