Patents by Inventor Hisao Okada

Hisao Okada 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: 20200335429
    Abstract: According to one aspect of the present disclosure, a flexible printed circuit board includes: an insulating base film; a first conductive pattern that is layered on the base film and that is coated with gold, nickel, or an anti-rust material; and a second conductive pattern that is layered on the base film and that is coated with tin or solder.
    Type: Application
    Filed: November 23, 2018
    Publication date: October 22, 2020
    Inventors: Junichi OKAUE, Hisao OKADA
  • Patent number: 8962866
    Abstract: Provided by the present invention is a surface-modified silica powder, characterized in that the said powder is obtained by surface treatment of a silica powder with one or two or more of a compound (A) and with an aminosilane (B), wherein the fixing rate of the compound (A) and the aminosilane (B) is a total of 50% or more, the hydrophobic rate is 80% or more, and the triboelectrostatic charge amount is 200 ?C/g or less in its absolute value. The surface-modified silica powder of the present invention can stabilize many properties including fluidity and electrostatic properties while can significantly reduce problems such as fogging and decrease in image quality without significantly deteriorating characteristics of a developing agent and so forth when this is used as an external additive.
    Type: Grant
    Filed: February 3, 2012
    Date of Patent: February 24, 2015
    Assignees: Nippon Aerosil Co., Ltd., Hodogaya Chemical Co., Ltd.
    Inventors: Yuki Amano, Naohiro Naito, Hisao Okada, Masaki Okubo, Yoshikazu Aoki, Hideyuki Otsuka
  • Publication number: 20130296578
    Abstract: Provided by the present invention is a surface-modified silica powder, characterized in that the said powder is obtained by surface treatment of a silica powder with one or two or more of a compound (A) and with an aminosilane (B), wherein the fixing rate of the compound (A) and the aminosilane (B) is a total of 50% or more, the hydrophobic rate is 80% or more, and the triboelectrostatic charge amount is 200 ?C/g or less in its absolute value. The surface-modified silica powder of the present invention can stabilize many properties including fluidity and electrostatic properties while can significantly reduce problems such as fogging and decrease in image quality without significantly deteriorating characteristics of a developing agent and so forth when this is used as an external additive.
    Type: Application
    Filed: February 3, 2012
    Publication date: November 7, 2013
    Applicants: HODOGAYA CHEMICAL CO., LTD., NIPPON AEROSIL CO., LTD.
    Inventors: Yuki Amano, Naohiro Naito, Hisao Okada, Masaki Okubo, Yoshikazu Aoki, Hideyuki Otsuka
  • Patent number: 8309288
    Abstract: A color toner is provided which has a dielectric strength equal to or lower than that of a black toner containing carbon black, and which has an improved charging rate and charge stability against changes in the environment.
    Type: Grant
    Filed: April 10, 2009
    Date of Patent: November 13, 2012
    Assignee: SAMSUNG Electronics Co., Ltd.
    Inventors: Hisao Okada, Mitsuru Oikawa
  • Patent number: 7702259
    Abstract: Provided are a multi-pass image forming apparatus and an image forming method using the same. The multi-pass image forming apparatus includes a plurality of developers for forming a plurality of electrostatic latent images using toners having different polarities and colors in one development process and for forming a multi-color image in at least two development processes; an exposure unit for forming the plurality of the electrostatic latent images on a photosensitive medium; and an intermediate transferring unit for having a toner images transferred thereon from the photosensitive medium that overlap to form the multi-color image, wherein the toner image may overlap another toner image on the intermediate transferring unit.
    Type: Grant
    Filed: May 26, 2006
    Date of Patent: April 20, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jong-moon Eun, Hisao Okada, Hyun-cheol Lee, Won Choe, Hyun-wook Bae, Won-wook Lee, So-won Sheen, In-cheol Jeon
  • Publication number: 20090317737
    Abstract: A color toner is provided which has a dielectric strength equal to or lower than that of a black toner containing carbon black, and which has an improved charging rate and charge stability against changes in the environment.
    Type: Application
    Filed: April 10, 2009
    Publication date: December 24, 2009
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Hisao Okada, Mitsuru Oikawa
  • Patent number: 7574164
    Abstract: An electrophotographic apparatus includes: a photoconductor; and two developing rollers facing the photoconductor. A developer fed out from between the two developing rollers is supplied to the photoconductor by the two developing rollers to form a toner image on the photoconductor. The developer includes a carrier having a volume-average particle size smaller than 70 ?m and a volume resistivity not lower than 106 ?·cm. A volume ratio of the carrier in a facing portion between the photoconductor and the developing rollers is not lower than 30% and not higher than 46%.
    Type: Grant
    Filed: September 23, 2005
    Date of Patent: August 11, 2009
    Assignee: Ricoh Company Ltd.
    Inventors: Hisao Okada, Hiroyuki Mabuchi, Teruaki Mitsuya, Tsuneaki Kawanishi, Akio Tsujita
  • Publication number: 20070172262
    Abstract: An electrophotographic apparatus includes: a photoconductor; and two developing rollers facing the photoconductor. A developer fed out from between the two developing rollers is supplied to the photoconductor by the two developing rollers to form a toner image on the photoconductor. The developer includes a carrier having a volume-average particle size smaller than 70 ?m and a volume resistivity not lower than 106 ?·cm. A volume ratio of the carrier in a facing portion between the photoconductor and the developing rollers is not lower than 30% and not higher than 46%.
    Type: Application
    Filed: September 23, 2005
    Publication date: July 26, 2007
    Applicant: Ricoh Printing Systems, Ltd.
    Inventors: Hisao Okada, Hiroyuki Mabuchi, Teruaki Mitsuya, Tsuneaki Kawanishi, Akio Tsujita
  • Publication number: 20070122209
    Abstract: A hybrid type image forming apparatus is provided. The apparatus uses a developer that contains a mixture of a toner and a carrier, and includes a photosensitive body and a development unit. An electrostatic latent image is formed on the photosensitive body. The development unit includes a magnetic roller and a developing roller. The magnetic roller forms a magnetic brush containing the toner and the carrier on the outer periphery of the magnetic roller, and the developing roller is installed such that the developing roller does not contact the magnetic roller and the photosensitive body to develop the electrostatic latent image using the toner supplied from the magnetic brush. A resistivity of the developer is no greater than 109 ?cm.
    Type: Application
    Filed: September 8, 2006
    Publication date: May 31, 2007
    Inventors: Hisao Okada, Won Choe, Hyun-Wook Bae
  • Publication number: 20060285883
    Abstract: Provided are a multi-pass image forming apparatus and an image forming method using the same. The multi-pass image forming apparatus includes a plurality of developers for forming a plurality of electrostatic latent images using toners having different polarities and colors in one development process and for forming a multi-color image in at least two development processes; an exposure unit for forming the plurality of the electrostatic latent images on a photosensitive medium; and an intermediate transferring unit for having a toner images transferred thereon from the photosensitive medium that overlap to form the multi-color image, wherein the toner image may overlap another toner image on the intermediate transferring unit.
    Type: Application
    Filed: May 26, 2006
    Publication date: December 21, 2006
    Inventors: Jong-moon Eun, Hisao Okada, Hyun-cheol Lee, Won Choe, Hyun-wook Bae, Won-wook Lee, So-won Sheen, In-cheol Jeon
  • Patent number: 7106983
    Abstract: A color image forming apparatus includes a developing unit to which a developing bias with an AC component superposed is applied, wherein the DC voltage of the developing bias is adjusted to set the detected density of a solid image at a specified value, the light amount of radiation for exposing an image area having a width of a few dots adjacent to the white paper is adjusted to set the detected density of an image developed under a peripheral electric field at a specified value, and the gradation density curve is regulated by alternately adjusting the DC voltage, the light amount of radiation for exposing the image area having a width of a few dots adjacent to the white paper, and the amplitude of the AC component until the detected density of a mesh point image having an area ratio from 60 to 80% falls within a specified range.
    Type: Grant
    Filed: August 12, 2004
    Date of Patent: September 12, 2006
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Masayoshi Nakayama, Teruaki Mitsuya, Hisao Okada, Keisuke Kubota, Takashi Rokutanda
  • Patent number: 7090956
    Abstract: In an image forming method, when viewed from the moving direction of a photosensitive body 1, there is disposed, on the upstream side, a first developing roller 61 opposed to and adjacent to the photosensitive body 1 and rotatable in the opposite direction to the photosensitive body 1, while the peripheral speed ratio of the roller 61 to the photosensitive body 1 ranges from 0.8 to 2.0; on the downstream side of the roller 61, there is disposed a second developing roller 62 rotatable in the same direction to the photosensitive body 1, while the peripheral speed ratio of the roller 62 to the photosensitive body 1 ranges from 1.05 to 2.0; and the shape coefficient SF1 of the toners of two-component developing agent ranges from 120 to 170, while the shape coefficient SF2 ranges from 110 to 130.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: August 15, 2006
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Katsuhiko Suzuki, Masami Ishikawa, Tsuneaki Kawanishi, Teruaki Mitsuya, Hisao Okada, Masayoshi Ishii
  • Publication number: 20060171729
    Abstract: A multicolor image forming apparatus includes a plurality of developing units and a development power supply unit. Each of the developing units includes a developing roller located at a development gap from a photosensitive body, deposits toner accommodated therein on a surface of the developing roller, and supplies the toner to the photosensitive body across the development gap. The development power supply unit applies a development bias voltage to developing rollers of the developing units, the developing bias voltage being a rectangular AC bias voltage in which a forward bias voltage and a reverse bias voltage alternate. A percentage of toner particles of the toner having diameter-charge amounts greater than a contamination limit diameter-charge amount of a toner particle is less than 5%.
    Type: Application
    Filed: January 24, 2006
    Publication date: August 3, 2006
    Inventors: Hisao Okada, So-Won Sheen, Jong-Moon Eun
  • Patent number: 6954604
    Abstract: The invention provides an electronic photographing apparatus using a two-component developer as a mixture of a toner and a carrier as well as a development unit including a developer roll having magnetic poles therein. The electronic photographing apparatus includes a development bias power source for applying to the developer roll a development bias voltage where an AC voltage is superimposed on a DC voltage. The electronic photographing apparatus develops a latent image on a photosensitive body by using toner to form an image, characterized in that the ratio of the volume of the carrier to a space sandwiched between the developer roll and the photosensitive body is set within a range from 32 percent to 46 percent and that that the resistivity of the carrier under a field strength of 2000 V/cm is set to 3×1010 ?cm or more.
    Type: Grant
    Filed: January 29, 2004
    Date of Patent: October 11, 2005
    Assignee: Ricoh Printing Systems, Ltd.
    Inventors: Hisao Okada, Masayoshi Nakayama
  • Publication number: 20050063721
    Abstract: A color image forming apparatus includes a developing unit to which a developing bias with an AC component superposed is applied, wherein the DC voltage of the developing bias is adjusted to set the detected density of a solid image at a specified value, the light amount of radiation for exposing an image area having a width of a few dots adjacent to the white paper is adjusted to set the detected density of an image developed under a peripheral electric field at a specified value, and the gradation density curve is regulated by alternately adjusting the DC voltage, the light amount of radiation for exposing the image area having a width of a few dots adjacent to the white paper, and the amplitude of the AC component until the detected density of a mesh point image having an area ratio from 60 to 80% falls within a specified range.
    Type: Application
    Filed: August 12, 2004
    Publication date: March 24, 2005
    Applicant: Hitachi Printing Solutions, Ltd.
    Inventors: Masayoshi Nakayama, Teruaki Mitsuya, Hisao Okada, Keisuke Kubota, Takashi Rokutanda
  • Patent number: 6829449
    Abstract: A transfer member transporting section is disposed so as to bring a tip end of a transfer member into contact with a peripheral face of a transfer rotary member before the tip end of the transfer member enters a nip area. A bias power supply has a polarity inverting function of, during a period from a timing when the tip end of the transfer member is brought into contact with the transfer rotary member by the transfer member transporting section, to that when the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is identical with that of a toner, to the transfer rotary member, and after the tip end of the transfer member enters the nip area, applying a voltage of a polarity which is opposite to that of the toner, to the transfer rotary member.
    Type: Grant
    Filed: May 30, 2003
    Date of Patent: December 7, 2004
    Assignee: Hitachi Printing Solutions, Ltd.
    Inventors: Hiroyoshi Matsumoto, Teruaki Mitsuya, Tsuneaki Kawanishi, Hisao Okada, Natsuki Kuribayashi, Masayoshi Ishii, Keisuke Kubota
  • Patent number: 6815658
    Abstract: A testing circuit 1, provided between an input terminal IN of an LSI 2 and the CSA 20, includes a switch NSW (a third switch), a capacitor CT which is connected in parallel to the switch NSW, and switches TC1 (a first switch) and TC2 (a second switch) which are connected in series across the capacitor CT. With this arrangement, the circuit including the capacitor CT and the CSA 20 can serve as a reverse amplifier circuit and can input a voltage waveform instead of the charges. Therefore, a conventional charge supply circuit is not necessary when the testing of a reading circuit 16 is carried out.
    Type: Grant
    Filed: September 24, 2002
    Date of Patent: November 9, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hisao Okada, Masayuki Takahashi, Hiroaki Ogawa
  • Patent number: 6813462
    Abstract: A developing unit in an electro-photographic apparatus such as a printer, a facsimile and a copier for actualizing an image employing colored particles such as toner, and more particularly to a developing unit for forming a toner image on the surface of a photosensitive body. The developing unit includes a plurality of developing rollers each having a core and a sleeve. The sleeve accommodates the core. The plurality of developing rollers include a first developing roller and a second developing roller. The sleeve for the first developing roller is rotated to move in the same direction as a moving direction of the surface of the photosensitive body. The sleeve for the second developing roller is rotated to move in an opposite direction to the moving direction of the surface of the photosensitive body. The core of only one of the plurality of developing rollers is driven in rotation while the other core is fixed.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: November 2, 2004
    Assignee: Hitachi Printing Solutions, Ltd.
    Inventors: Teruaki Mitsuya, Tsuneaki Kawanishi, Masayoshi Ishii, Hisao Okada, Hiroyoshi Matsumoto, Keisuke Kubota, Natsuki Kuribayashi
  • Patent number: 6797932
    Abstract: In a charge amount detection circuit, one part of circuit elements constituting a low pass filter circuit and one part of circuit elements constituting a voltage amplifier circuit are commonly use. A charge sensitive amplifier is followed by the low pass filter circuit and the voltage amplifier circuit, respectively, in this order. Since the low pass filter circuit is provided so as to share one part of circuit elements of the voltage amplifier circuit, it is possible to suppress the enlargement of the chip size due to the provision of LPF as much as possible so as to suppress the rise of the chip cost as much as possible.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: September 28, 2004
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Masayuki Takahashi, Hisao Okada
  • Publication number: 20040184842
    Abstract: The invention provides an electronic photographing apparatus using a two-component developer as a mixture of a toner and a carrier as well as a development unit including a developer roll having magnetic poles therein. The electronic photographing apparatus includes a development bias power source for applying to the developer roll a development bias voltage where an AC voltage is superimposed on a DC voltage. The electronic photographing apparatus develops a latent image on a photosensitive body by using toner to form an image, characterized in that the ratio of the volume of the carrier to a space sandwiched between the developer roll and the photosensitive body is set within a range from 32 percent to 46 percent and that that the resistivity of the carrier under a field strength of 2000 V/cm is set to 3×1010 &OHgr;cm or more.
    Type: Application
    Filed: January 29, 2004
    Publication date: September 23, 2004
    Applicant: Hitachi Printing Solutions, Ltd.
    Inventors: Hisao Okada, Masayoshi Nakayama