Patents by Inventor Toshimitsu Danzuka

Toshimitsu Danzuka 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: 6655772
    Abstract: A printing apparatus in which a printhead and a print medium intermittently move relatively to each other, and the printhead performs printing on the print medium during the relative movement. The temperature of the printhead is detected, the detected temperature is compared with a predetermined threshold value, and start of new relative movement accompanied by printing is controlled in correspondence with the result of comparison. The threshold value is set in correspondence with information regarding the number of pixels for which the printhead can perform printing during one relative movement. By this arrangement, reduction of output speed can be suppressed as much as possible, and inconveniences due to temperature rise of the printhead can be prevented.
    Type: Grant
    Filed: March 19, 2002
    Date of Patent: December 2, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshimitsu Danzuka, Yoshihiro Takada, Kenshi Hata, Katsushi Hara, Yukimichi Someya
  • Patent number: 6644777
    Abstract: In the ejection performance maintaining and recovering processing performed to a plurality of liquid ejection openings to which liquid reserved in the same liquid reservoir is supplied, even if the number of liquid ejection openings for which the maintaining and recovering processing is to be simultaneously performed changes, the ejection performance is maintained and recovered by discharging a proper amount of liquid from each of the liquid ejection openings, and the amount of liquid consumed in the ejection performance maintaining and recovering processing is reduced. An amount of liquid discharged from each of liquid ejection openings is substantially equalized, regardless of the number of liquid ejection openings to be processed.
    Type: Grant
    Filed: March 27, 2001
    Date of Patent: November 11, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventor: Toshimitsu Danzuka
  • Publication number: 20020140753
    Abstract: A printing apparatus in which a printhead and a print medium intermittently move relatively to each other, and the printhead performs printing on the print medium during the relative movement. The temperature of the printhead is detected, the detected temperature is compared with a predetermined threshold value, and start of new relative movement accompanied by printing is controlled in correspondence with the result of comparison. The threshold value is set in correspondence with information regarding the number of pixels for which the printhead can perform printing during one relative movement. By this arrangement, reduction of output speed can be suppressed as much as possible, and inconveniences due to temperature rise of the printhead can be prevented.
    Type: Application
    Filed: March 19, 2002
    Publication date: October 3, 2002
    Applicant: Canon Kabushiki Kaisha
    Inventors: Toshimitsu Danzuka, Yoshihiro Takada, Kenshi Hata, Katsushi Hara, Yukimichi Someya
  • Publication number: 20020085052
    Abstract: The number of printing elements that perform printing with a plurality of types of printing agents is determined in accordance with a maximum multiple printing count with which dots of each one of the plurality of types of printing agents are printed in an overlaying manner at substantially one position on a printing medium.
    Type: Application
    Filed: December 18, 2001
    Publication date: July 4, 2002
    Inventor: Toshimitsu Danzuka
  • Patent number: 6412898
    Abstract: An image processing apparatus which includes an image signal input device for outputting a first image signal including at least three signals corresponding to cyan, magenta and yellow, respectively, an image signal converter for converting at least one of the signals included in the first image signal into N (N is an integer greater than one) second image signals corresponding to N inks of different concentrations of a same color family, a black abstraction device for performing black abstraction on each of N second image signals individually to produce a third signal, and a signal processor for performing a UCR processing and black inking processing on the second and third signals to produce fourth signals.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: July 2, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshimitsu Danzuka, Akio Suzuki, Hisashi Fukushima, Yasushi Miura
  • Publication number: 20010035888
    Abstract: In the ejection performance maintaining and recovering processing performed to a plurality of liquid ejection openings to which liquid reserved in the same liquid reservoir is supplied, even if the number of liquid ejection openings for which the maintaining and recovering processing is to be simultaneously performed changes, the ejection performance is maintained and recovered by discharging a proper amount of liquid from each of the liquid ejection openings, and the amount of liquid consumed in the ejection performance maintaining and recovering processing is reduced. An amount of liquid discharged from each of liquid ejection openings is substantially equalized, regardless of the number of liquid ejection openings to be processed.
    Type: Application
    Filed: March 27, 2001
    Publication date: November 1, 2001
    Inventor: Toshimitsu Danzuka
  • Patent number: 6234600
    Abstract: An image recording apparatus using a plurality of recording heads that can prevent black lines from occurring at boundaries of each scanning of the recording heads. The total recorded ink volume at the boundaries is positively reduced so that the black lines and the overflow of ink are prevented. The apparatus includes at least a pair of a dark head for discharging relatively dark ink and a light head for discharging relatively light ink, and separates an input image signal into image signals applied to the dark and light heads using at least two tables. The two tables, one for edge nozzles of each recording head and the other for the remaining nozzles, separate the input image signal independently so that the total ink volume discharged from the edge nozzles are limited to a relatively small amount.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: May 22, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshimitsu Danzuka, Akio Suzuki, Hisashi Fukushima, Yasushi Miura
  • Patent number: 6130686
    Abstract: A color image forming apparatus includes an image signal input portion which supplies three image signals C, M and Y associated with cyan, magenta and yellow; an image signal conversion processing portion which converts the image signals C, M and Y into six image signals associated with thick C and thin C, thick M and thin M, and thick Y and thin Y, respectively, by using a thick/thin sorting table; and a color masking processing portion which performs color masking process, and outputs converted six image signals associated with thick C to thin Y. The converted six image signals undergo a black generation process, a UCR process and a black printing process, and a binarization processing thereafter. This makes it possible to produce color images of high quality with high reproducibility even if the hues of N color materials, which belong to the same color family and have different densities, such as thin cyan and thick cyan, differ from each other to some extent.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: October 10, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshimitsu Danzuka, Akio Suzuki, Hisashi Fukushima, Haruhiko Moriguchi, Yasushi Miura
  • Patent number: 6000776
    Abstract: An image forming apparatus includes reading means for reading the density of a test pattern corresponding to each of plural recording elements of a recording head, the recording elements being arranged in an array, and the test pattern being recorded by the recording elements. An eliminating means eliminates error information, recorded from an area outside a test pattern are, from density information obtained by the reading means when the density of a test pattern end portion corresponding to an end portion of the array of plural of recording elements is determined. A means is provided for uniforming the image densities in correspondence with the plurality of recording elements based on density information from which the error information is eliminated by the eliminating means.
    Type: Grant
    Filed: January 28, 1998
    Date of Patent: December 14, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akio Suzuki, Toshimitsu Danzuka, Haruhiko Moriguchi, Yoshihiro Takada, Yasushi Miura, Hisashi Fukushima, Masami Izumizaki, Nobuhiko Takekoshi, Nobuyuki Watanabe, Eiichi Takagi, Haruhiko Takahashi
  • Patent number: 5997123
    Abstract: An image recording apparatus for recording an image by using a plurality of recording elements which are driven an accordance with an image signal includes a first correction unit for correcting driving conditions of the recording element, and a second correction unit for correcting a level of the image signal, wherein a variation in the recording elements is corrected by a combination of the first and second correction units. A driving voltage or a width of drive pulse which is applied to each recording element is controlled as a driving condition, thereby making uniform an uneven image density.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: December 7, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobuhiko Takekoshi, Yoshihiro Takada, Toshimitsu Danzuka, Yasushi Miura, Haruhiko Moriguchi
  • Patent number: 5777641
    Abstract: There are provided a dark head and a light head for ejecting a dark ink and a light ink, respectively. First, an image is recorded by using the light head, and shading correcting data is set on the basis of the image. Second, images recorded by using the dark and the light heads are superimposed on each other, at this time, the image by the light head is recorded on the basis of the shading correcting data. Thereafter, with respect to the dark head, the shading correcting data is set on the basis of the superimposed images. As a result, when images recorded by the light and the dark heads are superimposed, the images have no shading.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: July 7, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akio Suzuki, Toshimitsu Danzuka
  • Patent number: 5752140
    Abstract: An image forming apparatus having an image carrying member for carrying an electrostatic image, fluororesin has a surface layer containing a fluororesin, and a developing device for developing the electrostatic image on the image carrying member. The image carrying member has a surface layer containing a fluororesin. The developing device has a developer carrying member, which is arranged as opposed to the image carrying member and which carries a developer, and a bias applying device for applying a development bias voltage to the developer carrying member. A period of a waveform of the bias voltage applied by the bias applying device has an oscillating part and a quiescent part.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: May 12, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshimitsu Danzuka, Yuji Sakemi, Hisashi Fukushima, Takeshi Menjo
  • Patent number: 5736996
    Abstract: An image recording apparatus includes a recording head in which a plurality of recording elements are arranged so as to form an image on a recording medium, a device for causing the recording head to print a predetermined test pattern, an image density reading device for reading the density of the test pattern formed by the recording head, an uneven image density correction device for correcting conditions for driving the plurality of recording elements in accordance with the result of reading, so as to make even the density of the image, a recording stabilizing device for stabilizing a recording operation performed by the recording head, and a control device for operating the recording stabilizing device before the test pattern is printed and operating the test pattern printing device after the recording head has been stabilized by the recording stabilizing device.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: April 7, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshihiro Takada, Akio Suzuki, Toshimitsu Danzuka, Haruhiko Moriguchi, Hisashi Fukushima, Masami Izumizaki, Yasushi Miura
  • Patent number: 5731825
    Abstract: An image recording apparatus using a plurality of recording heads that can prevent black lines from occurring at scanning boundaries of the recording heads. The total recorded ink volume at the boundaries is positively reduced so that the black lines and the overflow of ink are prevented. The apparatus includes at least a pair of a dark head for discharging relatively dark ink and a light head for discharging relatively light ink. The apparatus separates an input image signal into image signals applied to the dark and light heads using at least two tables. The two tables, one for edge nozzles of each recording head and the other for the remaining nozzles, separate the input image signal independently so that the total ink volume discharged from the edge nozzles are limited to a relatively small amount.
    Type: Grant
    Filed: August 29, 1996
    Date of Patent: March 24, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshimitsu Danzuka, Akio Suzuki, Hisashi Fukushima, Yasushi Miura
  • Patent number: 5636010
    Abstract: An image forming apparatus has a movable image bearing member, a plurality of developing devices operable for development at different locations along the direction of movement of the image bearing member to develop the image bearing member with toners of plural colors, and a transfer medium carrying member for carrying a transfer medium thereon and conveying the transfer medium to a transfer position. The toner images of plural colors on the image bearing member are superposition-transferred onto the transfer medium carried on the transfer medium carrying member. The transfer medium carrying member is capable of carrying a plurality of transfer mediums at different locations thereon.
    Type: Grant
    Filed: December 26, 1995
    Date of Patent: June 3, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshimitsu Danzuka, Takeshi Menjo, Takao Ogata
  • Patent number: 5596353
    Abstract: An image recording apparatus includes a recording head in which a plurality of recording elements are arranged so as to form an image on a recording medium, a device for causing the recording head to print a predetermined test pattern, an image density reading device for reading the density of the test pattern formed by the recording head, an uneven image density correction device for correcting conditions for driving the plurality of recording elements in accordance with the result of reading, so as to make even the density of the image formed in accordance with the result of reading, a recording stabilizing device for stabilizing a recording operation performed by the recording head, and a control device for operating the recording stabilizing device before the test pattern is printed and operating the test pattern printing device after the recording head has been stabilized by the recording stabilizing device.
    Type: Grant
    Filed: January 11, 1995
    Date of Patent: January 21, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshihiro Takada, Akio Suzuki, Toshimitsu Danzuka, Haruhiko Moriguchi, Hisashi Fukushima, Masami Izumizaki, Yasushi Miura
  • Patent number: 5596392
    Abstract: A developing apparatus including a developer container for accommodating a developer having magnetic particles; a rotatable developer carrying member, provided in a opening of the the developer container for carrying the developer; a magnet in the developer carrying member; a magnetic member, provided at a end portion of the developer carrying member, being subjected to magnetic force of the the magnet; wherein the magnetic member is positioned with a gap relative to the developer carrying member, along a circumference of the developer carrying member; a regulating member for regulating the developer on the the developer carrying member; wherein magnetic confining force for the developer by the magnetic member is weaker toward a regulation portion of the regulating member in a circumferential direction of the developer carrying member.
    Type: Grant
    Filed: March 23, 1995
    Date of Patent: January 21, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventor: Toshimitsu Danzuka
  • Patent number: 5581336
    Abstract: A developing device is provided with a developing container for accommodating developing agent including toner, a rotating developing agent carrier is arranged to face an image carrier carrying an electrostatic image for carrying the developing agent, and a conductive member is arranged along a longitudinal direction of the developing agent carrier with a spacing from the developing agent carrier. The conductive member is provided over longer than the longitudinal area of the developing agent carrier, and a voltage application circuit is employed for applying a voltage of the same polarity to a charging polarity of the toner to the conductive member.
    Type: Grant
    Filed: December 13, 1994
    Date of Patent: December 3, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shigeru Matsuzaki, Yuji Sakemi, Masami Izumizaki, Toshimitsu Danzuka
  • Patent number: 5539526
    Abstract: An image recording apparatus comprises an interface for inputting a binary image signal, a binary-multi-value converter that converts the input binary image signal into a multi-value image signal, a corrector for correcting the converted multi-value image signal according to characteristic data of a recording element, and a driver for driving the recording element according to the corrected multi-value image signal, thereby performing image recording.
    Type: Grant
    Filed: March 7, 1995
    Date of Patent: July 23, 1996
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akio Suzuki, Hisashi Fukushima, Haruhiko Moriguchi, Yasushi Miura, Toshimitsu Danzuka
  • Patent number: 5416596
    Abstract: An apparatus for transmission, reception and recording of an image, such as a facsimile apparatus, capable of correcting the unevenness in density or improper density resulting from fluctuation in the performance of the recording head of the receiving unit, with a limited amount of data transfer. At the start of communication, correction data for uneven or improper density of the recording head are sent from the receiving unit to the transmitting unit. The transmitting unit corrects the multi-value image data to be transmitted, based on the received correction data, and sends the corrected image data after conversion into binary state. The receiving unit receives the binary image data and effects image recording. The time and cost for data transmission can be reduced, as the correction is conducted at the transmitting unit and the data transmission can be made in binary data.
    Type: Grant
    Filed: October 24, 1991
    Date of Patent: May 16, 1995
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akio Suzuki, Hisashi Fukushima, Haruhiko Moriguchi, Yasushi Miura, Toshimitsu Danzuka