Patents by Inventor Shinji Takagi

Shinji Takagi 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: 6585363
    Abstract: In order to deposit a liquid for improving fixing ability and water resistance of an ink at an optimal position in an appropriate amount, to maximize an effect of the liquid, and to easily generate a driving data for ejecting the liquid, low resolution printing data for respective of four printing heads is read out from a frame memory. A logical sum of the printing data is calculated by an OR circuit. Then, the logical sum is processed by a look-up table to generate the driving data for the liquid ejecting head corresponding to high resolution.
    Type: Grant
    Filed: February 6, 1997
    Date of Patent: July 1, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Tanaka, Shinji Takagi, Hiroyuki Hyotani, Takehiko Kasamatsu
  • Publication number: 20030090537
    Abstract: Each of pixels of recorded image is formed by a plurality of dots composed with ink droplets ejected from a plurality of different orifices at individual different main-scannings. With this recording process, the variation of ink ejection characteristics between a plurality of orifices in a recording head can be reduced in forming pixels.
    Type: Application
    Filed: September 16, 2002
    Publication date: May 15, 2003
    Applicant: Canon Kabushiki Kaisha
    Inventors: Hideki Tanaka, Yasuyuki Tamura, Hiroto Takahashi, Shinji Takagi, Makoto Shioya, Masayoshi Tachihara, Tatsuo Kimura, Jun Ashiwa
  • Patent number: 6557984
    Abstract: An ink-jet printing head and an ink-jet printing apparatus can reduce fluctuation of density of an ink ejected from each nozzle by ejecting ink of different densities from the same nozzle without varying size of an ink droplet, or by controlling ejection of a mixture ink, in which a plurality of inks are mixed, for forming an image. The ink-jet printing head includes a plurality of ejection openings for ejecting ink, a plurality of ink passages communicated with the plurality of ejection openings, ink ejecting energy generating elements provided in the plurality of ink passages, a mixing liquid chamber connected to the plurality of ink passages in common, a plurality of individual liquid chambers supplying ink to the mixing liquid chamber, and a valve mechanism provided between the individual liquid chamber and the mixing liquid chamber and controlling supply amount of the inks supplied from the individual liquid chambers.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: May 6, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Sohei Tanaka, Shinji Takagi, Takeshi Ono, Masafumi Wataya, Noriyuki Suzuki, Masaaki Okada, Hiroyuki Hyotani, Midori Yasuda, Akira Ito
  • Patent number: 6547358
    Abstract: In an ink jet printer, formation time of processing for generating data for providing a treatment liquid for improving fixing or water resistance of an ink by insolubilizing or coagulating a color material in the ink is reduced. For this purpose, to perform HV conversion for raster data for image data related to printing, processing for temporarily storing image data and processing of rewriting the HV conversion result are performed in a same sequence. For example, a treatment liquid data formation register having the same structure as an HV conversion register is provided. This register is masked to a pattern according to a treatment liquid composition on a printing medium and is made corresponding to data bits of the HV conversion register. Print data accessed by the HV conversion register is located in relation to the access, thereby forming the treatment liquid data simultaneously.
    Type: Grant
    Filed: October 22, 2001
    Date of Patent: April 15, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Tanaka, Shinji Takagi, Hiroyuki Hyotani, Takehiko Kasamatsu
  • Publication number: 20030025766
    Abstract: An ink-jet printing head and an ink-jet printing apparatus can reduce fluctuation of density of an ink ejected from each nozzle by ejecting ink of different densities from the same nozzle without varying size of an ink droplet, or by controlling ejection of a mixture ink, in which a plurality of inks are mixed, for forming an image. The ink-jet printing head includes a plurality of ejection openings for ejecting ink, a plurality of ink passages communicated with the plurality of ejection openings, ink ejecting energy generating elements provided in the plurality of ink passages, a mixing liquid chamber connected to the plurality of ink passages in common, a plurality of individual liquid chambers supplying ink to the mixing liquid chamber, and a valve mechanism provided between the individual liquid chamber and the mixing liquid chamber and controlling supply amount of the inks supplied from the individual liquid chambers.
    Type: Application
    Filed: October 3, 2002
    Publication date: February 6, 2003
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Sohei Tanaka, Shinji Takagi, Takeshi Ono, Masafumi Wataya, Noriyuki Suzuki, Masaaki Okada, Hiroyuki Hyotani, Midori Yasuda, Akira Ito
  • Patent number: 6513906
    Abstract: Each of pixels of recorded image is formed by a plurality of dots composed with ink droplets ejected from a plurality of different orifices at individual different main-scannings. With this recording process, the variation of ink ejection characteristics between a plurality of orifices in a recording head can be reduced in forming pixels.
    Type: Grant
    Filed: June 3, 1992
    Date of Patent: February 4, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Tanaka, Yasuyuki Tamura, Hiroto Takahashi, Shinji Takagi, Makoto Shioya, Masayoshi Tachihara, Tatsuo Kimura, Jun Ashiwa
  • Publication number: 20020163562
    Abstract: An ink-jet printing head and an ink-jet printing apparatus can reduce fluctuation of density of an ink ejected from each nozzle by ejecting ink of different densities from the same nozzle without varying size of an ink droplet, or by controlling ejection of a mixture ink, in which a plurality of inks are mixed, for forming an image. The ink-jet printing head includes a plurality of ejection openings for ejecting ink, a plurality of ink passages communicated with the plurality of ejection openings, ink ejecting energy generating elements provided in the plurality of ink passages, a mixing liquid chamber connected to the plurality of ink passages in common, a plurality of individual liquid chambers supplying ink to the mixing liquid chamber, and a valve mechanism provided between the individual liquid chamber and the mixing liquid chamber and controlling supply amount of the inks supplied from the individual liquid chambers.
    Type: Application
    Filed: October 28, 1999
    Publication date: November 7, 2002
    Inventors: SOHEI TANAKA, SHINJI TAKAGI, TAKESHI ONO, MASAFUMI WATAYA, NORIYUKI SUZUKI, MASAAKI OKADA, HIROYUKI HYOTANI, MIDORI YASUDA, AKIRA ITO
  • Patent number: 6443546
    Abstract: A low-cost printing apparatus and printing control method through which the absence or presence of an ink tank and ink can be determined accurately regardless of the surrounding environment. The printing apparatus obtains the difference between a first signal, which is obtained from light received by a light-receiving element (16) in a case where a light reflecting surface (41) and an optical prism (42) are irradiated with light, and a second signal, which is obtained from light received by the light-receiving element (16) in a case where the light reflecting surface (41) and optical prism (42) are not irradiated with light, compares the difference with a predetermined threshold value and determines whether or not ink is present and/or whether or not the ink tank is present, based upon the result of the comparison.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: September 3, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventor: Shinji Takagi
  • Publication number: 20020070985
    Abstract: A low-cost printing apparatus and printing control method through which the absence or presence of an ink tank and ink can be determined accurately regardless of the surrounding environment. The printing apparatus obtains the difference between a first signal, which is obtained from light received by a light-receiving element (16) in a case where a light reflecting surface (41) and an optical prism (42) are irradiated with light, and a second signal, which is obtained from light received by the light-receiving element (16) in a case where the light reflecting surface (41) and optical prism (42) are not irradiated with light, compares the difference with a predetermined threshold value and determines whether or not ink is present and/or whether or not the ink tank is present, based upon the result of the comparison.
    Type: Application
    Filed: November 12, 1998
    Publication date: June 13, 2002
    Inventor: SHINJI TAKAGI
  • Patent number: 6361136
    Abstract: Precision of detecting existence/non-existence of a liquid container and a liquid level in the container is improved even if the detection is performed by a single sensor, or even if the S/N ratio of the detection is low, the detected results can be discriminated from one another. For this, a concave polyhedron is provided in the center of the bottom surface of an optical prism in order to reduce the amount of light reflected on the bottom surface of the optical prism and returned to a photoreceptor. Moreover, a reflection curved surface having a quadratic surface e.g. spherical surface or paraboloid, is provided on the bottom surface of an ink tank, for reflecting light emitted by an optical unit consisting of a light emission device and a photoreceptor.
    Type: Grant
    Filed: February 19, 1998
    Date of Patent: March 26, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Itaru Watanabe, Shinji Takagi, Soichi Hiramatsu, Osamu Sato, Kenta Udagawa
  • Publication number: 20020021315
    Abstract: An ink jet recording apparatus is provided which can detect ink in a print head highly precisely with a simple construction. The apparatus includes: a detection electrode to detect, through the ink on the ink jet print head board, a voltage change between print elements and drive elements which is produced as the print elements are driven; a periodical drive means to drive the print elements at a predetermined drive frequency; a voltage detection means to periodically detect an output voltage of the detection electrode at a timing corresponding to the drive frequency; and a state check means to check an ink ejection state of the ink jet print head according to a result of the detection by the voltage detection means.
    Type: Application
    Filed: May 15, 2001
    Publication date: February 21, 2002
    Inventors: Tomonori Sato, Shinji Takagi, Kentaro Yano, Tetsuhito Ikeda
  • Publication number: 20020018092
    Abstract: In the present invention, the minimum necessary consumption of ink can recover the channel miss state of the plurality of nozzles. The present invention provides a recovery processing method of an ink jet printing apparatus for forming images using a print head having a plurality of nozzles for ejecting ink droplets. The method comprises a first step for detecting channel miss state of said plurality of nozzles, and a second step for executing at least one of different recovery processes depending on the channel miss states of said plurality of nozzles detected in the first step.
    Type: Application
    Filed: May 1, 2001
    Publication date: February 14, 2002
    Inventors: Toshiharu Inui, Shinji Takagi, Kentaro Yano, Tetsuhito Ikeda, Masao Kato, Katsuhiko Takahashi, Kenichi Saito, Tomonori Sato
  • Publication number: 20010038396
    Abstract: The present inventions allow the detection of ink in the printing head by significantly simplified their configurations and on which various printing systems can be widely applied. There are a heater for supplying an energy to ejecting ink, a driver for driving heater, and a detection electrode capable of detecting a voltage variation between the heater and the driver to be occurred depending on the driving of the heater. Furthermore, an insulating film that covers the surface of the detection electrode prevents a chemical or physical change from the detection electrode. Furthermore, a reference element group or a reference unit that produces a signal as a reference of the detection signal avoids the influence of noise. Furthermore, an energy-generating element and another signal source improve the accuracy of ink-detection. A drive pulse which is insufficient to ejecting ink may be supplied to the heater to improve the accuracy of ink-detection.
    Type: Application
    Filed: February 14, 2001
    Publication date: November 8, 2001
    Inventors: Yoshiyuki Imanaka, Shinji Takagi, Ichiro Saito, Toshiharu Inui, Kentaro Yano, Tetsuhito Ikeda, Masao Kato, Katsuhiko Takahashi, Muga Mochizuki, Kenichi Saito, Tomonori Sato, Toru Kubokawa
  • Patent number: 6215971
    Abstract: An electrophotographic image-forming method has a contact charging step of charging the surface of an electrophotographic photosensitive member; an electrostatic latent image forming step of forming an electrostatic latent image on the surface of the electrophotographic photosensitive member charged; a developing step of developing the electrostatic latent image formed into a toner image; and a transfer step of transferring the toner image formed by the development from the electrophotographic photosensitive member to a transfer material, the developing step serving also as a cleaning step for collecting a toner remaining on the electrophotographic photosensitive member after transfer.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: April 10, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Harumi Sakoh, Haruyuki Tsuji, Shinji Takagi
  • Patent number: 6203133
    Abstract: A recording apparatus records at a higher resolution than the resolution of input image data. A half toning processor performs a halftoning process at each pixel of the input image to get multi level data from the input image data. A data producer produces pattern data corresponding to the pixel of the input image based on the multi level data. Data for a plurality of different patterns is produced for at least one value of the multi level data.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: March 20, 2001
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Tanaka, Shinji Takagi, Hiroyuki Hyotani
  • Patent number: 6123404
    Abstract: A recording head is provided with a plurality of recording elements. In the recording head, the number of record data can be counted accurately, following high-speed recording operation by counting only the number of drive data input via one signal line by means of a counter, from drive data input to two shift registers via signal lines according to a clock signal.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: September 26, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Tanaka, Shinji Takagi, Hiroyuki Hyotani, Takehiko Kasamatsu
  • Patent number: 6113290
    Abstract: An ink jet recording apparatus includes an edge detection unit that detects the positions of pixels in one pixel line in which data changes from 0 to 1 in accordance with the data serially converted from ORed data in a state where the data representing OR of each recording data on each ink color, and a discharge control data formation unit that forms fixing process driving data including data 1 at a given ratio to AND data obtainable by operating AND between the serially converted data from the ORed data and the detection output from the edge detection unit.
    Type: Grant
    Filed: February 19, 1997
    Date of Patent: September 5, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Tanaka, Shinji Takagi, Hiroyuki Hyotani, Takehiko Kasamatsu
  • Patent number: 6099102
    Abstract: An ink jet recording method comprises a pixel-recording step for forming each pixel by fewer droplets than the number of droplets to be required for obtaining a gradation of an image. Therefore all of the pixels required for the image are recorded without removing any pixel from them.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: August 8, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideki Tanaka, Shinji Takagi, Hiroyuki Hyotani
  • Patent number: 6095644
    Abstract: An ink-jet printing apparatus performs a printing process by discharging ink from color ink heads and treatment liquid from a liquid head for making the ink insoluble or coherent. The printing apparatus has the minimum amount of memory required to eject the treatment liquid as far as possible and performs excellent printing. For discharge data of one scanning performance of the color ink heads, the apparatus has only memories for each color ink head. Discharge data for the treatment liquid is formed by a treatment liquid discharge data creating portion based on the data stored in the memories upon switched by data-switching portion. Then the discharge data for the liquid head is supplied to the head after being stored in a buffer as much as the number of orifices of the head.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: August 1, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takehiko Kasamatsu, Shinji Takagi, Hideki Tanaka, Hiroyuki Hyotani
  • Patent number: 6085028
    Abstract: A data control apparatus is structured to execute complementary recording on one pixel array by dividing the scans of a recording head into four. In a nozzle context memory, the nozzle context data, which can be updated, are stored as control data to determine discharge or non-discharge of ink from discharge ports. In an operational circuit, the nozzle context data and image data are processed operationally, thus outputting drive data for the recording head. The data that indicates ink discharge in one pixel array are sequentially assigned to recording data per scan appropriately by use of the nozzle context data and the operational circuit. With the structure thus arranged, it is possible to implement making the capacity of memory smaller for use of data to control recording or non-recording, and also, to execute an intermittent recording by controlling recording or non-recording as required.
    Type: Grant
    Filed: March 26, 1997
    Date of Patent: July 4, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shinji Takagi, Hideki Tanaka, Hiroyuki Hyotani, Takehiko Kasamatsu