Patents by Inventor Masashi Okabe

Masashi Okabe 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: 7452440
    Abstract: A polyolefin resin drawn sheet 4 is laminated on at least one face of a sheet-form core material 6 having a density of 30 to 300 kgf/m3. At this time, a sheet or film 5 made of a bonding synthetic resin or rubber having a flow starting temperature lower than the thermal deformation temperature of the core material 6 and the melting point of the drawn sheet 4 is interposed between the core material 6 and the drawn sheet 4. The resultant stack product is heated to not less than the flow starting temperature of the synthetic resin or the rubber and not more than the thermal deformation temperature of the core material 6 and the melting point of the drawn sheet 4. At the same time of or after the heating, the stack product is pressed to apply a compression strain of 0.01 to 10% to the core material 6.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: November 18, 2008
    Assignee: Sekisui Chemical Co., Ltd.
    Inventors: Michitaka Tsujimoto, Katsuo Matsuzaka, Koji Yamaguchi, Masashi Okabe, Masanori Hirata, Masafumi Ishiyama
  • Patent number: 7369125
    Abstract: A current supply circuit providing a data line with a current corresponding to a digital signal composed of data bits includes a current control circuit, a precharge switch and a precharge regulating circuit. The current control circuit responds to control signals reflecting respective data bits to control the amount of current along the data line. The precharge switch precharges the data line to a predetermined voltage prior to current supply. The precharge regulating circuit exchanges with the data line electric charge corresponding to the control signals to move the voltage on the data line closer to a steady voltage corresponding to the data bits. In this way, an analog current corresponding to digital data can be promptly produced.
    Type: Grant
    Filed: May 20, 2004
    Date of Patent: May 6, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hidetada Tokioka, Masafumi Agari, Ryuichi Hashido, Masashi Okabe
  • Patent number: 7242378
    Abstract: A current supply circuit includes a bit select circuit selectively providing even-numbered bits or odd-numbered bits of eight bit image data, and supplies a gray-scale current corresponding to the bits provided from the bit select circuit to a pixel. In a one-frame period, a time length for supplying a current corresponding to the even-numbered bits to the light-emitting element is set twice as large as a time length for supplying a current corresponding to the odd-numbered bits. By setting 16 levels of the gray-scale current for four bits, a current-time product of a current passing through the light-emitting element during the one-frame period can be controlled to 256 levels for eight bits. Thereby, an image display device provided at each of the pixels with the light-emitting element can reduce sizes of circuits generating the gray-scale current in accordance with a digital signal.
    Type: Grant
    Filed: May 5, 2004
    Date of Patent: July 10, 2007
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masashi Okabe, Masafumi Agari, Hidetada Tokioka, Ryuichi Hashido
  • Patent number: 7154454
    Abstract: In a driving circuit of a spontaneous light emitting display device driven as an active matrix, a noise current is prevented from flowing in a light emitting element when compensating for a threshold voltage of a transistor for controlling current flowing to the emitting element, enhancing precision in luminance. A switching element for short-circuiting electrodes of the spontaneous light emitting element for a period in which the noise current flows in the light emitting element bypasses the noise current.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: December 26, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masashi Okabe, Mitsuo Inoue, Shuji Iwata, Takashi Yamamoto
  • Patent number: 7079094
    Abstract: In a compensation mode executed before a supply mode, a current supply circuit for supplying a data current according to display luminance to a current-driven light emitting device allows a reference current to pass through a drive transistor for supplying the data current to a data line in the supply mode. The voltage of a node connected to the gate of the drive transistor at this time is held by a voltage holding capacitor. In the supply mode, the voltage of the node changes according to a data voltage. The data voltage is set according to the difference between the data current to be supplied and the reference current.
    Type: Grant
    Filed: June 24, 2003
    Date of Patent: July 18, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hidetada Tokioka, Ryuichi Hashido, Takahiro Urakabe, Masafumi Agari, Masashi Okabe, Mitsuo Inoue
  • Patent number: 7063768
    Abstract: A polyolefin resin drawn sheet 4 is laminated on at least one face of a sheet-form core material 6 having a density of 30 to 300 kgf/m3. At this time, a sheet or film 5 made of a bonding synthetic resin or rubber having a flow starting temperature lower than the thermal deformation temperature of the core material 6 and the melting point of the drawn sheet 4 is interposed between the core material 6 and the drawn sheet 4. The resultant stack product is heated to not less than the flow starting temperature of the synthetic resin or the rubber and not more than the thermal deformation temperature of the core material 6 and the melting point of the drawn sheet 4. At the same time of or after the heating, the stack product is pressed to apply a compression strain of 0.01 to 10% to the core material 6.
    Type: Grant
    Filed: April 23, 2002
    Date of Patent: June 20, 2006
    Assignee: Sekisui Chemical Co., Ltd.
    Inventors: Michitaka Tsujimoto, Katsuo Matsuzaka, Koji Yamaguchi, Masashi Okabe, Masanori Hirata, Masafumi Ishiyama
  • Patent number: 7061452
    Abstract: In a spontaneous light-emitting display device operating in an active matrix mode, variations in the threshold voltages of transistors controlling the current flowing to light-emitting elements and variations in the light emission threshold voltages of the light-emitting elements are suppressed, reducing variations in the luminance of the light-emitting elements. Light-detecting elements detect light emitted by the light-emitting elements, and threshold voltages of the transistors are detected by the voltages of nodes of resistors and the light-emitting elements. Further, transistors controlled by respective signals of the light-detecting elements also detect the light emission threshold voltages of the light-emitting elements.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: June 13, 2006
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Mitsuo Inoue, Masashi Okabe, Shuji Iwata, Takashi Yamamoto
  • Publication number: 20060038800
    Abstract: A current supply circuit providing a data line with a current corresponding to a digital signal composed of data bits includes a current control circuit, a precharge switch and a precharge regulating circuit. The current control circuit responds to control signal reflecting respective data bits to control the amount of current along the data line (DL). The precharge switch precharges the data line to a predetermined voltage prior to current supply. The precharge regulating circuit exchanges with the data line electric charge corresponding to the control signals to move the voltage on the data line closer to a steady voltage corresponding to the data bits. In this way, an analog current corresponding to digital data can be promptly produced.
    Type: Application
    Filed: May 20, 2004
    Publication date: February 23, 2006
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hidetada Tokioka, Masafumi Agari, Ryuichi Hashido, Masashi Okabe
  • Patent number: 6984445
    Abstract: A multi-layer sheet of the present invention comprises a thermoplastic resin foam sheet, a reinforcing sheet layered on integrated with at least one side of the thermoplastic resin foam sheet; the reinforcing sheet being formed by a non-woven fabric which comprises non-meltable fibers which are interwound with one another and which are bound together with a thermoplastic resin, the thermoplastic resin foam sheet having an aspect ratio Dz/Dxy of bubbles of 1.2 or more, and an expansion ratio of 5˜50 cc/g, and therefore the sheet is excellent in bending strength, compressive strength, thermo-forming property and dimensional stability as well as lightweight property, and so can ideally be used for an upholstery material for vehicles, a heat-insulation material, a buffer material and the like.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: January 10, 2006
    Assignee: Sekisui Kagaku Kogyo Kabushiki Kaisha
    Inventors: Kazuo Yamagata, Isao Higuchi, Takamasa Fukuoka, Michitaka Tsujimoto, Masashi Okabe, Yoshihiro Inui
  • Publication number: 20050224174
    Abstract: A polyolefin resin drawn sheet 4 is laminated on at least one face of a sheet-form core material 6 having a density of 30 to 300 kgf/m3. At this time, a sheet or film 5 made of a bonding synthetic resin or rubber having a flow starting temperature lower than the thermal deformation temperature of the core material 6 and the melting point of the drawn sheet 4 is interposed between the core material 6 and the drawn sheet 4. The resultant stack product is heated to not less than the flow starting temperature of the synthetic resin or the rubber and not more than the thermal deformation temperature of the core material 6 and the melting point of the drawn sheet 4. At the same time of or after the heating, the stack product is pressed to apply a compression strain of 0.01 to 10% to the core material 6.
    Type: Application
    Filed: June 10, 2005
    Publication date: October 13, 2005
    Inventors: Michitaka Tsujimoto, Katsuo Matsuzaka, Koji Yamaguchi, Masashi Okabe, Masanori Hirata, Masafumi Ishiyama
  • Publication number: 20050174306
    Abstract: Signal lines for supplying signal currents to respective pixel circuits having light emitting elements are arranged. A signal line driving circuit generates, on a signal line, a signal current corresponding to the image data, by switching bit weighting currents output from bit weighting current source circuits provided for respective bits of the image data, using a switch circuit turned on/off dependent on the corresponding bit. Each current source circuit has a function of correcting the level of the bit weighting current output from itself, based on a reference current of the bit weighting current supplied from a reference current line. Therefore, even when the characteristics of TFTs forming respective current source circuits vary widely, variation in signal currents among the signal lines can be suppressed, and unevenness in emission luminance can be suppressed.
    Type: Application
    Filed: June 17, 2003
    Publication date: August 11, 2005
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masafumi Agari, Hidetada Tokioka, Ryuichi Hashido, Takahiro Urakabe, Suehiro Gotoh, Masashi Okabe, Mitsuo Inoue
  • Publication number: 20040239696
    Abstract: A current supply circuit includes a bit select circuit selectively providing even-numbered bits or odd-numbered bits of eight bit image data, and supplies a gray-scale current corresponding to the bits provided from the bit select circuit to a pixel. In a one-frame period, a time length for supplying a current corresponding to the even-numbered bits to the light-emitting element is set twice as large as a time length for supplying a current corresponding to the odd-numbered bits. By setting 16 levels of the gray-scale current for four bits, a current-time product of a current passing through the light-emitting element during the one-frame period can be controlled to 256 levels for eight bits. Thereby, an image display device provided at each of the pixels with the light-emitting element can reduce sizes of circuits generating the gray-scale current in accordance with a digital signal.
    Type: Application
    Filed: May 5, 2004
    Publication date: December 2, 2004
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masashi Okabe, Masafumi Agari, Hidetada Tokioka, Ryuichi Hashido
  • Patent number: 6812651
    Abstract: A spontaneous light emitting display device with low power consumption suppresses fluctuation in characteristics of driving elements of light emitting pixels and has no fluctuation in light emitting luminance of a light emitting element. For each of light emitting pixels arranged in a matrix, a respective photoelectric converting portion detects light emitted from the corresponding light emitting pixels is provided, so that a current flowing to the light emitting pixels is controlled by using a voltage produced from the respective photoelectric converting portion. The device suppresses luminance variation of the light emitting pixel even when the conversion gain of the photoelectric portion varies.
    Type: Grant
    Filed: November 20, 2002
    Date of Patent: November 2, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shuji Iwata, Masashi Okabe, Mitsuo Inoue, Takashi Yamamoto
  • Publication number: 20040036457
    Abstract: In a compensation mode executed before a supply mode, a current supply circuit for supplying a data current according to display luminance to a current-driven light emitting device allows a reference current to pass through a drive transistor for supplying the data current to a data line in the supply mode. The voltage of a node connected to the gate of the drive transistor at this time is held by a voltage holding capacitor. In the supply mode, the voltage of the node changes according to a data voltage. The data voltage is set according to the difference between the data current to be supplied and the reference current.
    Type: Application
    Filed: June 24, 2003
    Publication date: February 26, 2004
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Hidetada Tokioka, Ryuichi Hashido, Takahiro Urakabe, Masafumi Agari, Masashi Okabe, Mitsuo Inoue
  • Publication number: 20030181226
    Abstract: The present invention relates to a battery pack for a personal digital assistance such as a mobile telephone, and to a personal digital assistance such as a mobile telephone on which the battery pack is mounted. The present invention incorporates non-telephone functions, for instance, data storing, and audio information reproduction, makes available at least of which even with the battery pack is not connected to the personal digital assistance body, and forms a simple pack by wrapping a storage cell and the protection circuit for the storage cell with an insulation material to form the battery pack by overlaying the simple pack with the upper lid.
    Type: Application
    Filed: December 11, 2002
    Publication date: September 25, 2003
    Inventors: Kaoru Kawata, Kunio Nakaoka, Masashi Okabe, Yutaka Ishihara
  • Patent number: 6613172
    Abstract: An object of the present invention is to provide a composite foam having a high compressive strength. A polyolefin resin is melted and kneaded with a modifying monomer to react them. A thermally decomposable chemical foaming agent is added to the obtained modified resin, and the mixture is kneaded. The obtained foamable resin composition is shaped into a sheet. A sheet-like facing material (3) having a strength sufficient to inhibit the foamable sheet from expanding in in-plane directions during thermal foaming is laminated on at least one side of the foamable sheet. The obtained foamable composite sheet is thermally foamed to produce a composite foam (1) having rugby-ball-shaped cells (2) oriented in the direction of the sheet thickness.
    Type: Grant
    Filed: February 10, 2000
    Date of Patent: September 2, 2003
    Assignee: Sekisui Kagaku Kogyo Kabushiki Kaisha
    Inventors: Michitaka Tsujimoto, Takamasa Fukuoka, Hiroyuki Kurio, Masashi Okabe
  • Publication number: 20030159777
    Abstract: A polyolefin resin drawn sheet 4 is laminated on at least one face of a sheet-form core material 6 having a density of 30 to 300 kgf/m3. At this time, a sheet or film 5 made of a bonding synthetic resin or rubber having a flow starting temperature lower than the thermal deformation temperature of the core material 6 and the melting point of the drawn sheet 4 is interposed between the core material 6 and the drawn sheet 4. The resultant stack product is heated to not less than the flow starting temperature of the synthetic resin or the rubber and not more than the thermal deformation temperature of the core material 6 and the melting point of the drawn sheet 4. At the same time of or after the heating, the stack product is pressed to apply a compression strain of 0.01 to 10% to the core material 6.
    Type: Application
    Filed: January 31, 2003
    Publication date: August 28, 2003
    Inventors: Michitaka Tsujimoto, Katsuo Matsuzaka, Koji Yamaguchi, Masashi Okabe, Masanori Hirata, Masafumi Ishiyama
  • Publication number: 20030155866
    Abstract: An object of the present invention is to provide a spontaneous light emitting type display device of a low power consumption, which suppresses fluctuation in characteristics of driving elements of light emitting pixels and has no fluctuation in light emitting luminance of a light emitting element. For each of a plurality of light emitting pixels arranged in a matrix state, a photoelectric converting portion serving to receive a light emitted from the light emitting pixels is provided, so that a current flowing to the light emitting pixels is controlled by using a voltage obtained from the photoelectric converting portion. The device further includes a means for suppressing luminance variation of the light emitting pixel even when the conversion gain of the photoelectric portion varies.
    Type: Application
    Filed: November 20, 2002
    Publication date: August 21, 2003
    Inventors: Shuji Iwata, Masashi Okabe, Mitsuo Inoue, Takashi Yamamoto
  • Publication number: 20030142047
    Abstract: An object of the present invention is to implement a spontaneous light emitting type display device, in a pixel driving circuit of a spontaneous light emitting type display device using an active matrix method, which can suppress a variation in the threshold voltage of a transistor for controlling the current of a light emitting element and a variation in the light emission threshold voltage of the light emitting element to thereby suppress a variation in the luminance of the light emitting element. A photo-detecting element for detecting light emission of light emitting element and a resistor is connected in series and a threshold voltage of the transistor is detected by the voltage of the node. Further, a transistor controlled by a signal of the photo-detecting element is provided to also detect the light emission threshold voltage of the light emitting element.
    Type: Application
    Filed: November 12, 2002
    Publication date: July 31, 2003
    Inventors: Mitsuo Inoue, Masashi Okabe, Shuji Iwata, Takashi Yamamoto
  • Publication number: 20030112208
    Abstract: An object of the present invention is to prevent, in a driving circuit of a spontaneous light emitting type display device using an active matrix method, a noise current from flowing in a light emitting element when compensating for a threshold voltage of a transistor for controlling current flowing to the emitting element to thereby enhance precision in a luminance. The device is so constituted that a switching element capable of short-circuiting electrodes of the spontaneous light emitting element to set the switching element in a conduction state for a period in which the noise current flows the light emitting element and to make the noise current bypass the switching element for flowing.
    Type: Application
    Filed: November 13, 2002
    Publication date: June 19, 2003
    Inventors: Masashi Okabe, Mitsuo Inoue, Shuji Iwata, Takashi Yamamoto