Patents by Inventor Nobuaki Sakurada

Nobuaki Sakurada 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: 20020037167
    Abstract: There is provided a camera with a printer, which can be configured to have a much more compact size than the conventional cameras. The camera with a printer comprises a flash light-emitting device, a printer having a recording head for adding ink to a print medium, and a pumping motor for supplying the ink, and a battery for supplying electric power at least to the flash light-emitting device. DC power supply control is carried out by using a common DC-to-DC converter which is supplied with the electric power from the battery, for providing a DC power supply for driving the flash light-emitting device and a DC power supply for at least one of the recording head and the pumping motor of the printer.
    Type: Application
    Filed: September 12, 2001
    Publication date: March 28, 2002
    Inventors: Nobuaki Sakurada, Akihiko Tojo
  • Patent number: 5905511
    Abstract: The driving frequency of a head is changed in conformity with temperature, and density data is converted into an optimum head driving voltage in conformity with temperature, whereby the discharge driving frequency and driving voltage of the recording head become optimum under any temperature condition, and thus recording of high quality is ensured since irregularities cause by the temperature variation of the recording head are eliminated. The driving voltage is set by a drive control circuit that includes a plurality of limiters, one of which is chosen in accordance with ambient temperature.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: May 18, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshitaka Watanabe, Nobuaki Sakurada, Makoto Aoki, Eiichi Sato
  • Patent number: 5172142
    Abstract: The driving frequency of a head is changed in conformity with temperature, and density data is converted into an optimum head driving voltage in conformity with temperature, whereby the discharge driving frequency and driving voltage of the recording head become optimum under any temperature condition, thus recording of high quality is ensured and since irregularities caused by the temperature variation of the recording head are eliminated. The driving voltage is set by a drive control circuit that includes a plurality of limiters, one of which is chosen in accordance with ambient temperature.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: December 15, 1992
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshitaka Watanabe, Nobuaki Sakurada, Makoto Aoki, Eiichi Sato
  • Patent number: 4959659
    Abstract: A method of and an apparatus for forming a color picture, which can provide sufficiently satisfactory picture quality and which can be made practicable in terms of cost and reliability utilizes colorants having a plurality of different densities with respect to at least one color among yellow, magenta and cyan provided to form a color picture. Assuming that the number of densities of each color of yellow, magenta and cyan is respectively N.sub.Y, N.sub.M and N.sub.C, the magnitude relation among them is set to be N.sub.M, N.sub.C >N.sub.Y.
    Type: Grant
    Filed: June 27, 1988
    Date of Patent: September 25, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Sasaki, Nobuaki Sakurada, Hideaki Kawamura
  • Patent number: 4931864
    Abstract: An image forming apparatus for forming an image of a partial area of an entire image frame includes an apparatus for designating a part of a frame and apparatus for selecting an image formation operation for the predetermined area designated by the designating means or an image formation operation for the entire area. The image data corresponding to the predetermined area is read out and a histogram, indicating intensity distribution, is produced corresponding thereto. A gamma conversion characteristic is determined based on a cumulative frequency distribution produced from the histogram. The image data read out is converted in accordance with the determined gamma conversion characteristic. An image is formed on the basis of the converted image data representing the predetermined part of the frame or the entire frame.
    Type: Grant
    Filed: September 27, 1989
    Date of Patent: June 5, 1990
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Kawamura, Nobuaki Sakurada, Takashi Sasaki
  • Patent number: 4860034
    Abstract: The driving frequency of a head is changed in conformity with temperature, and density data is converted into an optimum head driving voltage in conformity with temperature, whereby the discharge driving frequency and driving voltage of the recording head become optimum under any temperature condition, and thus recording of high quality is ensured the since irregularities caused by the temperature variation of the recording head are eliminated. The driving voltage is set by a drive control circuit that includes a plurality of limiters, one of which is chosen in accordance with ambient temperature.
    Type: Grant
    Filed: March 30, 1988
    Date of Patent: August 22, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshitaka Watanabe, Nobuaki Sakurada, Makoto Aoki, Eiichi Sato
  • Patent number: 4821056
    Abstract: A digital display system connected to an exposure indicator in a camera to provide a digital display representative of the exposure value in shutter speed by an array of numerical indicators of the block number eight type. When the numerical value of shutter speed is equal to or larger than one second, the indicator which is directly to the right of the least significant digit is utilized to display an indicium representing a "second" unit as is usual in digital stop watch art by driving a pair of upper-positioned parallel segments in the "FIG. eight" pattern to be lit serially from the least significant digit.
    Type: Grant
    Filed: April 18, 1980
    Date of Patent: April 11, 1989
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masaharu Kawamura, Nobuaki Sakurada, Hiroyasu Murakami, Nobuhiki Shinoda, Tadashi Ito
  • Patent number: 4772911
    Abstract: An image formation apparatus such as an ink-jet color printer has a head selection controller, a dither processor, and a selection switch for selecting the head selection controller or the dither processor. Dither processing or analog processing can be selected to reproduce any type of image with excellent quality.
    Type: Grant
    Filed: June 16, 1987
    Date of Patent: September 20, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Sasaki, Nobuaki Sakurada, Hideaki Kawamura
  • Patent number: 4727436
    Abstract: For reproducing a picture with a density gradient through printing, an overlapped region is provided in a high density dot reproduction range and a low density dot reproduction range. The switch-over between the high density dot at the overlapped region is conducted where the picture density sharply changes. This reduces the unfavorable perception of quality differences in a printed picture resulting from the switch-over between the high and low density dots.
    Type: Grant
    Filed: December 23, 1986
    Date of Patent: February 23, 1988
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Kawamura, Nobuaki Sakurada, Yuichi Sato, Yoshitaka Watanabe
  • Patent number: 4714935
    Abstract: An ink-jet head driver comprises: a pressure chamber filled with a recording liquid; a piezo-electric element as electrical/mechanical transducing means for enlarging the capacity of the pressure chamber at a first stage and contracting it in a second stage into the state before enlargement, thereby emitting the recording liquid; and a device for adjusting the time interval between the first and second stages to adjust the emitting velocity. The capacity of the pressure chamber is changed due to charge and discharge by a charging/discharging circuit, and charge/discharge time constants of this circuit are selectively controlled by a control unit. According to this driver, mixture of air into recording liquid in the ink-jet head when the piezo-electric element is expanded is prevented, and a variable range of a dot diameter of the recording liquid droplet can be extended, thereby improving recording quality.
    Type: Grant
    Filed: September 23, 1986
    Date of Patent: December 22, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Mitsuru Yamamoto, Nobuaki Sakurada, Yoshitaka Watanabe
  • Patent number: 4713746
    Abstract: A picture-forming method comprises the steps of providing picture forming elementary particles having different optical densities; controlling the areas occupied by the respective picture forming elementary particles; and representing gradient by said different picture forming elementary particles while limiting the percentage of the gradient level area represented by the highest density elementary particle to said picture forming elementary particles to under 70% of the total area repsesented by said respective different picture forming elementary particles, thereby giving a picture which does not feel "rough". Apparatus is also disclosed for performing the method.
    Type: Grant
    Filed: December 23, 1986
    Date of Patent: December 15, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshitaka Watanabe, Nobuaki Sakurada, Hideaki Kawamura, Yuichi Sato
  • Patent number: 4713701
    Abstract: A picture producing apparatus forms a picture comprising a plurality of picture elements with different light-reflecting properties providing different optical reflection densities using a plurality of dot forming units to provide dots of recording materials of different concentrations. The optical reflection density range of an entire original picture to be reproduced is determined and selecting circuitry responsive to that determination selects at least one of the dot forming units to form picture elements reproducing the original picture. The dot forming units vary the areas of the picture elements formed by the dots so as to represent in the reproduced picture the optical reflection density range of the original.
    Type: Grant
    Filed: March 24, 1986
    Date of Patent: December 15, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Kawamura, Nobuaki Sakurada, Yuichi Sato, Yoshitaka Watanabe
  • Patent number: 4706132
    Abstract: A video signal processing system including an A/D converting circuit for analog-to-digital converting an input video signal; a storing circuit for storing data produced from the A/D converting circuit; a coefficient multiplying circuit for multiplying the data stored at the storing circuit by coefficients; and a control circuit for controlling the coefficients for the coefficient multiplying circuit in obtaining a scanning line interpolation signal or a drop-out compensating signal.
    Type: Grant
    Filed: March 22, 1985
    Date of Patent: November 10, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Makoto Takayama, Nobuaki Sakurada
  • Patent number: 4682186
    Abstract: A method for forming a color image by using a plurality of coloring materials and controlling quantities of the coloring materials in each pixel to form different colors is disclosed. When a density to be reproduced for at least one of the coloring materials exceeds a density reproducible for that coloring material, the quantities of other coloring materials are reduced.
    Type: Grant
    Filed: October 25, 1984
    Date of Patent: July 21, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Sasaki, Nobuaki Sakurada, Hideaki Kawamura
  • Patent number: 4682216
    Abstract: Color image picture forming process and apparatus can provide a picture with smooth shadow portions without false contours. When a black component of a color picture data is smaller than a predetermined value, the black component is expressed by using the combination of cyan, magenta and yellow colorants. When the black component is larger than the predetermined value, it is expressed by alternately using the black colorant and the three colorant combination. In another embodiment, picture quality can be enhanced by using a black colorant having a higher density than the cyan, magenta and yellow colorants.
    Type: Grant
    Filed: March 1, 1984
    Date of Patent: July 21, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takashi Sasaki, Nobuaki Sakurada, Hideaki Kawamura, Jiro Moriyama
  • Patent number: 4672432
    Abstract: A method for reproducing a halftone color image is disclosed, in which each picture element comprises a plurality of cells and one dot is formed for each cell. At least two colorent densities are used for at least some of the colors. When there is more than one combination of colorants which can represent a given density in a picture element, the combination having the largest number of dots is selected. In a preferred embodiment, more colorants of different densities are used for cyan and magenta then are used for black and yellow.
    Type: Grant
    Filed: April 23, 1984
    Date of Patent: June 9, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobuaki Sakurada, Hideaki Kawamura, Takashi Sasaki
  • Patent number: 4667228
    Abstract: An image signal processing apparatus has a color decorder for preparing a histogram for the brightness level of each color signal of an input image signal such as an NTSC signal, and an image process circuit for calculating a cumulative brightness distribution curve of the histogram and for performing gamma-correction of the input image signal in accordance with the cumulative brightness distribution curve. A CPU in the image process circuit can calculate upper and/or lower extremities of each cumulative distribution curve and perform normalization of each color signal within the range defined by the calculated upper and/or lower extremity.
    Type: Grant
    Filed: October 11, 1984
    Date of Patent: May 19, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Kawamura, Takashi Sasaki, Nobuaki Sakurada
  • Patent number: 4664496
    Abstract: Most of the elements constituting this camera system consists of digital circuits, whereby a central processing unit is built in this camera system in such a manner that various kinds of photographic modes are possible without increasing the number of the elements.
    Type: Grant
    Filed: April 28, 1986
    Date of Patent: May 12, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobuhiko Shinoda, Nobuaki Sakurada, Masaharu Kawamura, Tadashi Ito, Fumio Ito, Hiroyashu Murakami
  • Patent number: 4658300
    Abstract: A video signal processing method and apparatus retrieves pixel signals by sampling an input video signal consisting of a plurality of horizontal scanning lines. In this method, the ratio of the number of vertical pixels to the number of horizontal scanning lines is set into for example 2 or less; in the vertical direction, the pixel signals of the vertical pixels are obtained by the interpolation on the basis of the pixel signals sampled from a plurality of horizontal scanning lines; while in the horizontal direction, the input video signal is sampled at the horizontal sampling frequency to be determined by that ratio. In the above interpolation processing, the ratio of the number of recording pixels to the number of original pixels in the direction of height or width of an image picture is set into ##EQU1## (where, n and M are positive integers).
    Type: Grant
    Filed: March 5, 1984
    Date of Patent: April 14, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Kawamura, Nobuaki Sakurada, Takashi Sasaki
  • Patent number: 4658284
    Abstract: There is disclosed an image forming apparatus for obtaining an image from a television image with 625 horizontal scanning lines with a circuitry substantially same as that for obtaining an image from a television image with 525 horizontal scanning lines. In this apparatus the samples from six scanning lines are converted to form five scanning lines by means of sampling circuit and converting circuit.
    Type: Grant
    Filed: January 2, 1985
    Date of Patent: April 14, 1987
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideaki Kawamura, Nobuaki Sakurada, Takashi Sasaki