Patents by Inventor Jiro Tanuma

Jiro Tanuma 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: 6498616
    Abstract: Adjustment of correction data for the respective LEDs at the end of manufacture of a print head is performed by transferring provisional correction data from a manufacturing device to an LED driver, directly, i.e., without once being stored in a storage circuit 10c in the print head, and measuring the amounts of light from the LEDs and varying the correction data, and repeating such an operation until the correction data is optimized. The optimized correction data as well as the strobe time data determined from the measured average power are written in the storage circuit 10c. During use of the printer, the data stored in the storage circuit 10c is used for correction of the data and determination of the strobe time.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: December 24, 2002
    Assignee: OKI Data Corporation
    Inventors: Akira Nagumo, Minoru Teshima, Jiro Tanuma
  • Patent number: 6373513
    Abstract: A non-impact printer has a print data correction circuit for providing a print data correction processing for video signals transmitted from a printing control unit to produce correction output data or patterns for printing on basic raster lines and other correction output data or patterns for printing on sub-raster lines. Those correction output data or patterns are supplied to the print head in the form of a real printing data signal.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: April 16, 2002
    Assignee: Oki Data Corporation
    Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Akira Nagumo
  • Patent number: 6285384
    Abstract: Bit data of a received video signal is partially converted into a first signal representing a data sequence corresponding to the resolution of an LED head. The first signal is transmitted to the LED head in the form of a real printing data signal that is to be printed on a basic raster line in synchronism with a line timing signal. The remaining bit data of the received video signal, which are not converted into the first signal, are converted into a second signal representing another data sequence, and then stored in a line buffer. The second signal stored in the line buffer is transmitted to the LED head in the form of a real printing data signal that is to be printed on an additional raster line in synchronism with an additional line timing signal. The LED head drive energy with which the basic raster lines are printed and another LED head drive energy with which the additional raster lines are printed are set independently of each other. The LED head may be provided with such a resolution function.
    Type: Grant
    Filed: July 20, 1998
    Date of Patent: September 4, 2001
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Nobuo Wakasugi, Kazuhiko Nagaoka, Toshikazu Ito
  • Patent number: 6049349
    Abstract: A non-impact printer has a print data correction circuit for providing a print data correction processing for video signals transmitted from a printing control unit to produce correction output data or pattern for printing on the basic raster line and other correction output data or patterns for printing on the sub-raster lines. Those correction output data or patterns are supplied to the print head in the form of a real printing data signal.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: April 11, 2000
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Akira Nagumo
  • Patent number: 5990920
    Abstract: A driving apparatus has driving circuits that supply driving energy to driven elements which form dots. The driving circuits are controlled by driving data indicating which driven elements are to be driven, and compensation data adjusting the amount of driving energy. The compensation data are stored in compensation memory circuits coupled to the driving circuits. A single data transfer means transfers the driving data to the driving circuits and the compensation data to the compensation memory circuits. If the driven elements are located on two or more different semiconductor chips, some of the compensation data preferably compensate for chip-to-chip differences, while other compensation data compensate for dot-to-dot differences within the same chip.
    Type: Grant
    Filed: August 8, 1996
    Date of Patent: November 23, 1999
    Assignee: Oki Data Corporation
    Inventors: Akira Nagumo, Minoru Teshima, Jiro Tanuma
  • Patent number: 5973709
    Abstract: An LED printer includes a printing control unit and an LED head. When a video signal received at the control unit has a higher resolution than the LED head, the control unit carries out the logical AND between successive bit data of the video signal to convert the video signal to a first signal. Corresponding to a line timing signal, this first signal is transferred as a head data signal to the LED head and is then printed on a basic raster scanning line. Further, the control unit also carries out the exclusive-OR between the successive bit data of the video signal so that the video signal is converted to a second signal and outputted to a line buffer. Corresponding to an additional line timing signal, the second signal is transferred as another head data signal to the LED head and is printed on an additional raster scanning line. The LED head drive energy for performing printing along the basic raster scanning line is set independently.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: October 26, 1999
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Norio Nakajima, Shinichi Katakura
  • Patent number: 5818488
    Abstract: Bit data of a received video signal is partially converted into a first signal representing a data sequence corresponding to the resolution of an LED head. The remaining bit data of the received video signal, which are not converted into the first signal are converted into a second signal representing another data sequence corresponding to the resolution of an LED head. The LED head includes a resolution conversion circuit which converts the video data into the first signal and the second signal. The signals are stored in a shift register having a plurality of line buffers. The first signal is printed on a basic raster line and the second signal is printed on an additional raster line. An LED head drive energy with which basic raster lines are printed and another LED head drive energy with which additional raster lines are printed are set independently of each other.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: October 6, 1998
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Nobuo Wakasugi, Kazuhiko Nagaoka, Toshikazu Ito
  • Patent number: 5751328
    Abstract: Bit data of a received video signal is partially converted into a first signal representing a data sequence corresponding to the resolution of an LED head. The first signal is transmitted to the LED head in the form of a real printing data signal that is to be printed on a basic raster line in synchronism with a line timing signal. The remaining bit data of the received video signal, which are not converted into the first signal, are converted into a second signal representing another data sequence, and then stored in a line buffer. The second signal stored in the line buffer is transmitted to the LED head in the form of a real printing data signal that is to be printed on an additional raster line in synchronism with an additional line timing signal. The LED head drive energy with which the basic raster lines are printed and another LED head drive energy with which the additional raster lines are printed are set independently of each other. The LED head may be provided with such a resolution function.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: May 12, 1998
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Nobuo Wakasugi, Kazuhiko Nagaoka, Toshikazu Ito
  • Patent number: 5648810
    Abstract: Bit data of a received video signal is partially converted into a first signal representing a data sequence corresponding to the resolution of an LED head. The first signal is transmitted to the LED head in the form of a real printing data signal that is to be printed on a basic raster line in synchronism with a line timing signal. The remaining bit data of the received video signal, which are not converted into the first signal, are converted into a second signal representing another data sequence, and then stored in a line buffer. The second signal stored in the line buffer is transmitted to the LED head in the form of a real printing data signal that is to be printed on an additional raster line in synchronism with an additional line timing signal. The LED head drive energy with which the basic raster lines are printed and another LED head drive energy with which the additional raster lines are printed are set independently of each other.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: July 15, 1997
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Nobuo Wakasugi, Kazuhiko Nagaoka, Toshikaru Ito
  • Patent number: 5539525
    Abstract: A method for printing an image including the step of generating a basic line timing signal and an additional line timing signal providing timings between respective timings of the basic line timing signal, producing a matrix by a video signal of a number of lines corresponding to a ratio of a resolution of the video signal to a resolution of a printing portion, producing one dot of a grayscale data signal having grayscale information of dots of the matrix, and driving a printing head by head drive energy determined according to the grayscale data signal, when an image is printed by using the printing head having a resolution in the raster direction less than the resolution of the video signal for forming the image to be printed. Although a number of dots for forming the image is reduced, amount of information is not reduced since dot information is converted into the grayscale information, so that high-quality printing is possible at a time of printing for grayscale.
    Type: Grant
    Filed: March 25, 1993
    Date of Patent: July 23, 1996
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura
  • Patent number: 5518323
    Abstract: According to a method of adjusting a head gap, a wire dot head is set to a predetermined position of a reference head gap; a printing pattern for detecting printing time is printed by a plurality of pins; reference printing times of respective pins are detected. Next, a test printing is performed with test printing dots previously selected from printing data, and printing time of the test printing is detected. Then, the thickness of the printing media is calculated based on the reference printing time and the printing time of the test printing. At that time, a rule of thumb in which the difference of the printing time corresponds to the difference of the head gap, is used. Then, a shift amount of the wire dot head is calculated for setting the head gap to an optimum value according to the thickness of the printing media, and gap shifting mechanism shifts the wire dot head by the shift amount. This leads to highly accurate detection of the head gap and improves printing quality thereof.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: May 21, 1996
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Hiroshi Sakaino, Hideaki Ishimizu, Mitsuru Kishimoto, Noboru Ooishi, Masayuki Ishikawa, Chihiro Komori, Naoji Akutsu, Jiro Tanuma, Tadashi Kasai
  • Patent number: 5482387
    Abstract: In a dot print head of an impact type moved in a direction of spacing movement relative to a printing medium, and having a plurality of printing elements each having a printing wire arranged substantially in an elongated circle centered at a line parallel with the direction in which the printing elements are driven, and which is provided with a wire guide having guide elements for the respective printing wires for guiding tips of the printing wires to predetermined positions on said printing medium, the guide elements are divided into at least four rows each extending in the direction orthogonal to said direction of the spacing movement and orthogonal to the direction in which the printing wires extend, and distances between said rows are multiples of 1/240 inches.
    Type: Grant
    Filed: August 18, 1994
    Date of Patent: January 9, 1996
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Hideaki Ishimizu, Akira Hagiwara, Tadashi Kasai
  • Patent number: 5478156
    Abstract: A printer includes a controller for providing a sequence control for the printer in its entirety in response to a control signal and a video signal from another controller. A printer head is adapted for latching and printing a printing data signal transmitted from the controller.
    Type: Grant
    Filed: August 13, 1993
    Date of Patent: December 26, 1995
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Hiroshi Kikuchi, Katsuyuki Ito, Shinichi Katakura, Jiro Tanuma, Hiroshi Okada, Kazuhiko Nagaoka, Akira Nagumo
  • Patent number: 5450288
    Abstract: A printed chip-on-board substrate is for mounting a high-power semiconductor chip. As a construction for efficiently releasing or dissipating heat to be generated in the semiconductor chip, the printed substrate has a printed interconnected substrate and a metal plate bonded on a back side of the substrate. The printed interconnected substrate is constructed by forming an interconnected layer on a surface of the substrate. At a mount area where the semiconductor chip is to be mounted, an opening is formed reaching the metal plate. The metal plate covers the opening on the side of the back side and is formed with a thickness capable of providing rigidity sufficient to support thereon at least the semiconductor chip to be mounted.
    Type: Grant
    Filed: September 14, 1993
    Date of Patent: September 12, 1995
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Naoji Akutsu, Chihiro Komori, Hideaki Ishimizu
  • Patent number: 5424934
    Abstract: A multivoltage power supply which can output a plurality of high voltages in parallel. The voltage values of the respective outputs are feedback to an A/D converter. Each feedback signal is converted to a digital signal and the difference between the digital signal and a corresponding predetermined output voltage is then calculated in the form of a digital value. This digital value is inputted to a corresponding auto-reload timer, whereby a pulse signal having a pulse width corresponding to the digital value is output at a predetermined frequency.
    Type: Grant
    Filed: November 8, 1993
    Date of Patent: June 13, 1995
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Takehiko Okubo
  • Patent number: 5330277
    Abstract: A drive system for a wire dot head is provided with sensors for detecting displacements of corresponding print wires. Each sensor outputs a movement initiation timing signal and an impact timing signal for the corresponding print wire. An electric current to be fed to an associated coil is normally controlled by these timing signals. It is detected whether these timing signals are obtained in a predetermined time period. If not, electric power is continuously fed to the coil or is forcedly cut off so that the timing signals are obtained within the predetermine time period.
    Type: Grant
    Filed: October 21, 1992
    Date of Patent: July 19, 1994
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Tadashi Kasai, Takao Uchida, Jiro Tanuma, Naoji Akutsu, Chihiro Komori
  • Patent number: 5326183
    Abstract: Printing control includes determining printing dot density of print data to be supplied to a printing head, averaging the printing dot density during a predetermined period of time based on the printing dot density determined, selecting a printing speed in response to the average value of printing dot density, and controlling printing to print at the selected printing speed.
    Type: Grant
    Filed: November 14, 1991
    Date of Patent: July 5, 1994
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Tadashi Kasai, Jiro Tanuma, Naoji Akutsu, Hideaki Ishimizu, Chihiro Komori
  • Patent number: 5311403
    Abstract: A printed chip-on-board substrate is for mounting a high-power semiconductor chip. As a construction for efficiently releasing or dissipating heat to be generated in the semiconductor chip, the printed substrate has a printed interconnected substrate and a metal plate bonded on a back side of the substrate. The printed interconnected substrate is constructed by forming an interconnected layer on a surface of the substrate. At a mount area where the semiconductor chip is to be mounted, an opening is formed reaching the metal plate. The metal plate covers the opening on the side of the back side and is formed with a thickness capable of providing rigidity sufficient to support thereon at least the semiconductor chip to be mounted.
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: May 10, 1994
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Naoji Akutsu, Chihiro Komori, Hideaki Ishimizu
  • Patent number: 5307049
    Abstract: A drive current for driving actuators is generated based on a first digital signal comprising n-bit binary data which is supplied from a microprocessor and it is applied to an excitation coil. The drive current is supplied to the exciting coil and is converted into a voltage which is then converted into a second digital signal comprising n-bit binary data. The binary data of the second digital signal is compared with the digital data of the first digital signal to detect an alarm condition. Furthermore, the second digital signal is compared with first and second reference value to set plural alarm conditions.
    Type: Grant
    Filed: April 28, 1992
    Date of Patent: April 26, 1994
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Takao Uchida, Naoji Akutsu, Jiro Tanuma
  • Patent number: 5295750
    Abstract: In a wire-dot impact printer having a capacitance detector for detecting a displacement of each armature by a sensor electrode arranged opposite the armature, a space is formed between each sensor electrode and its associated armature, and a shield pattern is formed with a small space left around each sensor electrode. The shield pattern is fed with a potential at least equal to the potential of each sensor electrode. This makes it possible to reduce the influence of noise upon detection of a capacitance by the capacitance detector. A noise canceling electrode is also disposed around each sensor electrode and is connected to the sensor electrode, whereby a noise canceling circuit is further provided to eliminate noise voltage. The noise canceling circuit can eliminate a noise voltage picked up by the sensor electrode and the noise canceling electrode.
    Type: Grant
    Filed: February 9, 1993
    Date of Patent: March 22, 1994
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Naoji Akutsu, Takao Uchida, Chihiro Komori, Masaru Ito