Patents by Inventor Haruo Fujii

Haruo Fujii 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: 6760051
    Abstract: An image forming apparatus is provided, with which it is possible to reduce the overall size of an apparatus. The image forming apparatus includes an image bearing member including a plurality of switching elements that are arranged in a moving direction and a generatrix direction of the image bearing member, and a latent image forming unit for forming a latent image on the image bearing member, the latent image forming unit including a voltage generating unit for generating a voltage in each switching element in accordance with an image signal.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: July 6, 2004
    Assignee: Canon Kabushiki Kaisha
    Inventors: Haruo Fujii, Fumihiko Arishima, Yujiro Ando, Hiroki Kisu, Shigeki Kondo, Masaaki Matsushima
  • Publication number: 20020126195
    Abstract: An image forming apparatus is provided, with which it is possible to reduce the overall size of an apparatus. The image forming apparatus includes an image bearing member including a plurality of switching elements that are arranged in a moving direction and a generatrix direction of the image bearing member, and a latent image forming unit for forming a latent image on the image bearing member, the latent image forming unit including a voltage generating unit for generating a voltage in each switching element in accordance with an image signal.
    Type: Application
    Filed: February 28, 2002
    Publication date: September 12, 2002
    Inventors: Haruo Fujii, Fumihiko Arishima, Yujiro Ando, Hiroki Kisu, Shigeki Kondo, Masaaki Matsushima
  • Patent number: 6101286
    Abstract: It is an object of this invention to provide an image processing apparatus which, when nonmagnetic mono-component development is performed, prevents the formation of white gaps in pattern boundaries between different colors and thereby prevents degradation in the image quality of the formed image. To achieve this object, in one embodiment of the invention, the density value VD(n) of the nth pixel on a certain line is applied to the A input terminal of a selector 207, and the density value VD(n-1) of the (n-1)th pixel is applied to the B input terminal of the selector 207. A subtracter 203 calculates the increase of VD(n) from VD(n-1). If a comparator 204 determines that the increase is a predetermined value C1 or less, a selection signal in the selector 207 is so set that the terminal B (the value of the immediately preceding pixel) is selected.
    Type: Grant
    Filed: July 2, 1996
    Date of Patent: August 8, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Shimizu, Haruo Fujii, Hiroshi Sasame, Tatsuya Kobayashi, Takashi Kawana, Tetsuya Kobayashi, Naoki Enomoto, Akihiko Uchiyama, Yoshiro Saito, Yoichiro Maebashi, Takaaki Tsuruya
  • Patent number: 5974281
    Abstract: The present invention provides an image forming apparatus for forming an image on a transfer material by using an intermediate transfer member, having a first transfer bias power supply for applying transfer bias to a first transfer unit to generate first transfer bias between a photosensitive member and an intermediate transfer member, when toner images are successively firstly-transferred onto the intermediate transfer member, and a second transfer bias power supply for providing constant current to generate second transfer bias between the intermediate transfer member and the secondary transfer electrode, and wherein the second transfer bias power supply applies, in an overlap fashion, transfer bias of current having a current value greater than a current value of the transfer bias to be applied to an upstream image area of the transfer material and having the same polarity as that of the latter transfer bias to at least a non-image area of the transfer material at an end portion thereof in a transfer mate
    Type: Grant
    Filed: June 24, 1998
    Date of Patent: October 26, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Haruo Fujii, Koichi Hiroshima, Hideyuki Yano
  • Patent number: 5873010
    Abstract: A color image forming apparatus having a plurality of developers is disclosed. The apparatus includes a photosensitive drum, a density sensor for detecting a developed control toner image, CPU and RAM. The apparatus performs a first control for image formation based on a density of a control toner image developed by a first developer, a second control for image formation based on a density of a control toner image developed by a second developer, and determining whether the second control is to be performed based on the density of the control toner image developed by the first developer.
    Type: Grant
    Filed: September 22, 1994
    Date of Patent: February 16, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naoki Enomoto, Takao Aoki, Haruo Fujii, Hiroshi Sasame, Tatsuhiko Hayakawa, Tatsuya Kobayashi, Tetsuya Kobayashi, Akihiko Uchiyama, Yoshiro Saito, Yoichiro Maebashi
  • Patent number: 5678130
    Abstract: A developing apparatus includes a developer carrying member, disposed opposed to an image bearing member, for carrying a developer; a developing bias voltage applying source for applying a developing bias voltage having an oscillating component to the developer carrying member to develop an electrostatic latent image formed on the image bearing member; wherein10.0.ltoreq.T11/(T11+T12).times.100.ltoreq.90.0,where T11 is a time period of a first step in which an electric field is formed in a direction for directing the developer from the developer carrying member toward the image bearing member in one cycle of the oscillating component of the developing bias voltage applied by the developing bias application source, and T12 is a time period of a third step between the first step and a second step in which an electric field is formed in a direction for directing the developer from the image bearing member to the developer carrying member, and T11/(T11+T12) is an inclination of the developing bias voltage.
    Type: Grant
    Filed: May 3, 1996
    Date of Patent: October 14, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Naoki Enomoto, Haruo Fujii, Hiroshi Sasame, Motoi Katoh, Tatsuya Kobayashi, Masao Nakano, Kazuhisa Kemmochi, Tetsuya Kobayashi, Toshiaki Miyashiro, Akihiko Uchiyama, Yoshiro Saito
  • Patent number: 5666588
    Abstract: By altering a developing bias, a plurality of patch images are formed on a photoconductor, and a density of each patch image is measured, thereby judging whether or not a target density value is within a range of the plurality of measured density values. If the target density value is outside the range, a developing bias which realizes the target density is obtained by an interpolation, in accordance with two measured density values that are closest to the target density value among a plurality of measured densities, and with a developing bias of two patch images that are related to these two measured density values.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: September 9, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akihiko Uchiyama, Haruo Fujii, Hiroshi Sasame, Tatsuya Kobayashi, Tetsuya Kobayashi, Naoki Enomoto, Yoshiro Saito, Yoichiro Maebashi, Takaaki Tsuruya
  • Patent number: 5666597
    Abstract: An image forming apparatus includes an image bearing member for bearing an image, the image bearing member being rotatable at a first speed and a second speed which is different from the first speed, wherein during image formation on the image bearing member, the first speed is selected, and after completion of image formation on the image bearing member, a speed of rotation of the image bearing member is switchable from the first speed to the second speed; a discharger for electrically discharging the image bearing member at a discharging position, the discharger discharging the image bearing member at least one turn after the trailing edge of the image on the image bearing member passes through the discharging position and before the speed of the image bearing member is switched from the first speed to the second speed.
    Type: Grant
    Filed: October 8, 1996
    Date of Patent: September 9, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroshi Sasame, Haruo Fujii, Tatsuhiko Hayakawa, Tatsuya Kobayashi, Tetsuya Kobayashi, Naoki Enomoto, Akihiko Uchiyama, Yoshiro Saito, Youichirou Maebashi
  • Patent number: 5559591
    Abstract: An image forming apparatus including image forming unit for forming an unfixed image on a recording medium, a pair of fixing rotary members for fixing the unfixed image on the recording medium, a cleaning member for cleaning surfaces of the fixing rotary members, the fixing rotary members and the cleaning member being an integral unit separable from the apparatus, detection unit for detecting remaining quantity of the cleaning member, and a unit for requesting the exchange of the integral unit of the fixing rotary member pair and the cleaning member in response to the output of the detection unit.
    Type: Grant
    Filed: June 2, 1995
    Date of Patent: September 24, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Motoi Kato, Haruo Fujii, Toshifumi Moritani, Tatsuya Kobayashi, Tetsuya Kobayashi, Toshiaki Miyashiro, Naoki Enomoto, Akihiko Uchiyama, Yoshiro Saito
  • Patent number: 5548381
    Abstract: A developing apparatus includes a toner carrying member, disposed opposite an image bearing member for bearing an electrostatic image, for carrying toner to the image bearing member; an electric field forming device for forming an alternating electric field between the image bearing member and the toner carrying member, wherein the alternating electric field includes a first phase in which a constant electric field for urging the toner from said image bearing member toward said toner carrying member continues for a predetermined period, a second phase in which a constant electric field for urging the toner from said toner carrying member toward said image bearing member continues for a predetermined period, and a third phase in which the electric field gradually changes from that in the first phase to that in the second phase within a predetermined period .DELTA.T, and a controller for changing a ratio (.DELTA.T/T), where T is one period of the alternating electric field.
    Type: Grant
    Filed: September 14, 1994
    Date of Patent: August 20, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshiro Saito, Haruo Fujii, Hiroshi Sasame, Tatsuhiko Hayakawa, Tatsuya Kobayashi, Tetsuya Kobayashi, Naoki Enomoto, Akihiko Uchiyama, Youichirou Maebashi
  • Patent number: 5543900
    Abstract: An image forming apparatus includes an image bearing member for bearing an image of toner and a charging member contactable to the image bearing member to charge the image bearing member. The charging member is adapted to receive a voltage and the toner has a melt index of not less than 0.5 g/10 min. In the apparatus,P/(V.times.L).ltoreq.50J/m.sup.2where v is a movement speed of the image bearing member when the image bearing member is charged by the charging member (m/sec), L is an effective charging length of the charging member, measured in a direction perpendicular to the movement direction of the image bearing member (m), and P is an amount of electric power consumed by the charging member (W).
    Type: Grant
    Filed: December 12, 1994
    Date of Patent: August 6, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Youichirou Maebashi, Haruo Fujii, Hiroshi Sasame, Hiroaki Kawakami, Tatsuya Kobayashi, Tetsuya Kobayashi, Naoki Enomoto, Akihiko Uchiyama, Yoshiro Saito
  • Patent number: 5523829
    Abstract: An image recording apparatus includes an image bearing member; a recording material carrying member for carrying a recording material to a transfer position for transfer of an image; a moving device for imparting relative movement between the image bearing member and the recording material carrying member; and a recess in the recording material carrying member for permitting the image bearing member and the recording material carrying member to face each other without contact therebetween. The recording material feeding speed is switched from a first speed different from the fixing speed to a second speed substantially the same so that when it imparts the approaching relative movement, the peripheral speeds of the recording material carrying member and image bearing member are substantially equal immediately before they contact.
    Type: Grant
    Filed: September 28, 1993
    Date of Patent: June 4, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiaki Miyashiro, Haruo Fujii, Motoi Katoh, Tatsuya Kobayashi, Tetsuya Kobayashi, Akira Ito, Naoki Enomoto, Akihiko Uchiyama, Yoshiro Saito
  • Patent number: 5508796
    Abstract: The present invention provides an image forming apparatus with an image bearing member capable of rotating while bearing a toner image thereon, a transfer device for transferring the toner image from the image bearing member to a recording material at a transfer position, recording material bearing member capable of rotating while bearing the recording material thereon and adapted to convey the recording material to the transfer position, a pair of rotary members arranged at an upstream side of the recording material bearing member in a recording material conveying direction and adapted to pinch and convey the recording material, and a separation device for separating the recording material from the recording material bearing member at a separation position.
    Type: Grant
    Filed: March 22, 1994
    Date of Patent: April 16, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroshi Sasame, Takao Aoki, Haruo Fujii, Toshihiko Ochiai, Motoi Kato, Tatsuya Kobayashi, Tetsuya Kobayashi, Toshiaki Miyashiro, Naoki Enomoto, Akihiko Uchiyama, Yoshiro Saito, Takehiko Suzuki, Yoichiro Maebashi
  • Patent number: 5471284
    Abstract: An image forming apparatus usable with a process cartridge for forming an image on a recording material. The process cartridge includes an image bearing member, and at least one developing device for developing a latent image formed on the image bearing member with a developer. Each of said at least one developing devices includes a developer accommodating device for accommodating a respective developer to be used in said at least one developing device.
    Type: Grant
    Filed: May 16, 1994
    Date of Patent: November 28, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Haruo Fujii, Tatsuya Kobayashi, Nobuhiro Imai, Hisayoshi Kojima, Masao Umezawa, Hideki Tada, Akira Ito, Kaoru Seto, Motoi Katoh, Daisuke Murata
  • Patent number: 5414493
    Abstract: An image forming apparatus includes a detachably mountable process cartridge, the process cartridge including an image bearing member and a color developing device actable on the image bearing member, the color developing device containing plural developing units having yellow developer, respectively; detachably mountable developing device actable on the image bearing member in the process cartridge, the detachably mountable developing device containing black developer and being detachably mountable independently of the process cartridge; and a device for forming a latent image on the image bearing member; a transfer device for transferring a developed image from the image bearing member to a recording material.
    Type: Grant
    Filed: August 25, 1994
    Date of Patent: May 9, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Haruo Fujii, Tatsuya Kobayashi, Nobuhiro Imai, Hisayoshi Kojima, Masao Umezawa, Hideki Tada, Akira Ito, Kaoru Seto, Motoi Katoh, Daisuke Murata
  • Patent number: 5390012
    Abstract: An image forming apparatus includes an image bearing member; an image forming device for forming a toner image on the image bearing member; a transfer material carrying member for carrying a transfer material, wherein the toner image is electrostatically transferred onto the transfer material carried on the transfer material carrying member, wherein the transfer material carrying member has a dielectric layer carrying the transfer material and a supporting member for supporting the transfer material through the dielectric layer, wherein a gap is provided between the dielectric layer and the supporting member. Alternatively disclosed is a transfer material carrying member formed of a support layer, an elastic layer on top of the support layer, an intermediate layer on top of the elastic layer, and a dielectric layer on top of the intermediate layer.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: February 14, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiaki Miyashiro, Haruo Fujii, Toshihiko Ochiai
  • Patent number: 5313064
    Abstract: The present invention is a scintillator which emits light in response to radiation. The scintillator is capable of being reversibly changed between solid and liquid phases, whichever is desired, by temperature control. The scintillator comprises a fluorescent substance for converting radiation energy into light energy; a solvent which transfers radiation energy to the fluorescent substance and dissolves and diffuses the fluorescent substance and a radioactive substance acting as an object of measurement to thereby homogenize them; and a fixing substance which enables the solvent, the fluorescent substance and the radioactive substance to be fixed in a solid state and also liquified upon heating, the fixing substance being capable of phase change reversibility.
    Type: Grant
    Filed: August 7, 1992
    Date of Patent: May 17, 1994
    Assignee: Packard Instrument B.V.
    Inventor: Haruo Fujii
  • Patent number: 5307127
    Abstract: A developing apparatus includes a developer carrying member for supplying a developer to an image bearing member, wherein the developer is a one component developer, and has a flowability index of 5-30%. A developing bias voltage application device applies a developing bias to the developer carrying member, wherein the developing bias application device applies an oscillating bias voltage, including a first peak voltage, for an application period T1, for forming an electric field for urging the developer from the developer carrying member to the image bearing member, and a second peak voltage, for an application period T2, for forming an electric field for urging the developer from the image bearing member to the developer carrying member, wherein T1:T2 satisfies 1:2-1:10.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: April 26, 1994
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tetsuya Kobayashi, Haruo Fujii, Motoi Katoh, Tatsuya Kobayashi, Toshiaki Miyashiro, Naoki Enomoto, Akihiko Uchiyama, Yoshiro Saito
  • Patent number: 5229821
    Abstract: An image forming apparatus is provided with a detachable process cartridge having an electrophotographic photoconductive drum and a plurality of developing units. Each of the developing units has a signal generating device for generating a signal corresponding to the amount of toner in the developing unit, and an output signal of the signal generating device is transmitted to a toner amount discriminating circuit mounted in the body of the image forming apparatus through a common line.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: July 20, 1993
    Assignee: Canon Kabushiki Kaisha
    Inventor: Haruo Fujii
  • Patent number: 5155364
    Abstract: The present invention is a scintillator which emits light in response to radiation. The scintillator is capable of being reversibly changed between solid and liquid phases, whichever is desired, by temperature control. The scintillator comprises a fluorescent substance for converting radiation energy into light energy; a solvent which transfers radiation energy to the fluorescent substance and dissolves and diffuses the fluorescent substance and a radioactive substance acting as an object of measurement to thereby homogenize them; and a fixing substance which enables the solvent, the fluorescent substance and the radioactive substance to be fixed in a solid state and also liquified upon heating, the fixing substance being capable of phase change reversibility.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: October 13, 1992
    Assignee: Packard Instrument B.V.
    Inventor: Haruo Fujii