Patents by Inventor Takao Sakamoto

Takao Sakamoto 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: 7541646
    Abstract: A thin film transistor device according to an embodiment of the invention includes: a thin film transistor having a silicon layer including a source region, a drain region, and a channel region, a gate insulating layer, and a gate electrode formed on an insulating substrate; an interlayer insulating layer covering the thin film transistor; a line electrically connected with the source region, the drain region, and the gate electrode through a contact hole formed in the interlayer insulating layer; a first upper insulating layer covering the line and the interlayer insulating layer and smoothing out stepped portions of the line and irregularities of a surface of the interlayer insulating layer; and a second upper insulating layer covering the first upper insulating layer, the second upper insulating layer having a hydrogen diffusion coefficient smaller than a hydrogen diffusion coefficient of the first upper insulating layer.
    Type: Grant
    Filed: February 12, 2007
    Date of Patent: June 2, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hitoshi Nagata, Takao Sakamoto, Naoki Nakagawa
  • Patent number: 7514364
    Abstract: In a hydrophilicity treatment method including the step of rotating, on a polishing cloth, a mirror surface of a silicon wafer subjected to mirror-polishing followed by rinsing treatment while the mirror surface is pushed onto the cloth under the application of a small load with the contact of the mirror surface with a hydrophilicity treatment liquid, thereby making the mirror surface hydrophilic, the hydrophilicity treatment liquid is an aqueous liquid which comprises an organic compound having at least one hydrophilic group and having a molecular weight of 100 or more, a basic nitrogen-containing organic compound and a surfactant, and which has a pH of 9.5 to 10.5.
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: April 7, 2009
    Assignee: Covalent Materials Corporation
    Inventor: Takao Sakamoto
  • Patent number: 7396707
    Abstract: A silicon nitride film and a silicon oxide film are formed on a glass substrate. On the silicon oxide film is formed a thin film transistor T including a source region, a drain region, a channel region having a predetermined channel length, a first GOLD region having an impurity concentration lower than the impurity concentration of the source region, a second GOLD region having an impurity concentration lower than the impurity concentration of the drain region, a gate insulation film, and a gate electrode. The length of an overlapping portion in plane between the gate electrode and the second GOLD region in the direction of the channel length is set longer than the length in the direction of the channel region of an overlapping portion in plane between the gate electrode and the first GOLD region.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: July 8, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihiko Toyoda, Takao Sakamoto, Kazuyuki Sugahara
  • Patent number: 7388569
    Abstract: A reflective liquid crystal display device is integrated with a liquid crystal display panel (1), detects display surface illuminance by a plurality of light sensors (10) provided in the vicinity of the display surface, and in accordance with the detection result, controls luminous intensity of a front light (lighting means) (19) using a lighting control circuit (22) so that the display surface illuminance becomes a predetermined magnitude. Even if the use environment of the reflective liquid crystal display device changes, or more specifically, intensity of external light shone from outside of the device into the display surface varies, the configuration allows controlling automatically the amount of emission from the front light to automatically maintain an appropriate display luminance and to reduce electric power consumption.
    Type: Grant
    Filed: December 9, 2002
    Date of Patent: June 17, 2008
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masafumi Agari, Mitsuo Inoue, Takashi Yamamoto, Shigeyuki Yoshida, Takao Sakamoto
  • Publication number: 20070210353
    Abstract: A thin film transistor device according to an embodiment of the invention includes: a thin film transistor having a silicon layer including a source region, a drain region, and a channel region, a gate insulating layer, and a gate electrode formed on an insulating substrate; an interlayer insulating layer covering the thin film transistor; a line electrically connected with the source region, the drain region, and the gate electrode through a contact hole formed in the interlayer insulating layer; a first upper insulating layer covering the line and the interlayer insulating layer and smoothing out stepped portions of the line and irregularities of a surface of the interlayer insulating layer; and a second upper insulating layer covering the first upper insulating layer, the second upper insulating layer having a hydrogen diffusion coefficient smaller than a hydrogen diffusion coefficient of the first upper insulating layer.
    Type: Application
    Filed: February 12, 2007
    Publication date: September 13, 2007
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hitoshi NAGATA, Takao Sakamoto, Naoki Nakagawa
  • Publication number: 20070207615
    Abstract: In a hydrophilicity treatment method including the step of rotating, on a polishing cloth, a mirror surface of a silicon wafer subjected to mirror-polishing followed by rinsing treatment while the mirror surface is pushed onto the cloth under the application of a small load with the contact of the mirror surface with a hydrophilicity treatment liquid, thereby making the mirror surface hydrophilic, the hydrophilicity treatment liquid is an aqueous liquid which comprises an organic compound having at least one hydrophilic group and having a molecular weight of 100 or more, a basic nitrogen-containing organic compound and a surfactant, and which has a pH of 9.5 to 10.5.
    Type: Application
    Filed: February 23, 2007
    Publication date: September 6, 2007
    Inventor: Takao Sakamoto
  • Patent number: 7262433
    Abstract: A first thin film transistor including a gate electrode, a source region, a drain region, a GOLD region, and a channel region is formed at a first region at a TFT array substrate. A second thin film transistor including a gate electrode, a source region, drain region, a GOLD region, and a channel region is formed at a second region. The GOLD length (0.5 ?m) of the GOLD region of the second thin film transistor is set shorter than the GOLD length (1.5 ?m) of the GOLD region of the first thin film transistor. Accordingly, a semiconductor device directed to reducing the area occupied by semiconductor elements is obtained.
    Type: Grant
    Filed: May 26, 2005
    Date of Patent: August 28, 2007
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuyuki Sugahara, Naoki Nakagawa, Yoshihiko Toyoda, Takao Sakamoto
  • Publication number: 20070087535
    Abstract: A silicon nitride film and a silicon oxide film are formed on a glass substrate. On the silicon oxide film is formed a thin film transistor T including a source region, a drain region, a channel region having a predetermined channel length, a first GOLD region having an impurity concentration lower than the impurity concentration of the source region, a second GOLD region having an impurity concentration lower than the impurity concentration of the drain region, a gate insulation film, and a gate electrode. The length of an overlapping portion in plane between the gate electrode and the second GOLD region in the direction of the channel length is set longer than the length in the direction of the channel region of an overlapping portion in plane between the gate electrode and the first GOLD region.
    Type: Application
    Filed: November 30, 2006
    Publication date: April 19, 2007
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Yoshihiko Toyoda, Takao Sakamoto, Kazuyuki Sugahara
  • Patent number: 7176491
    Abstract: A silicon nitride film and a silicon oxide film are formed on a glass substrate. On the silicon oxide film is formed a thin film transistor T including a source region, a drain region, a channel region having a predetermined channel length, a first GOLD region having an impurity concentration lower than the impurity concentration of the source region, a second GOLD region having an impurity concentration lower than the impurity concentration of the drain region, a gate insulation film, and a gate electrode. The length of an overlapping portion in plane between the gate electrode and the second GOLD region in the direction of the channel length is set longer than the length in the direction of the channel region of an overlapping portion in plane between the gate electrode and the first GOLD region.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: February 13, 2007
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshihiko Toyoda, Takao Sakamoto, Kazuyuki Sugahara
  • Publication number: 20060182307
    Abstract: To keep sounds emitted from a speaker apparatus in high quality. According to one embodiment of the present invention, a top layer and a back layer in a diaphragm of a speaker unit built in a speaker apparatus, and a reinforcement board for reinforcement which is interposed between the top layer and the back layer, and is disposed from the center part of diaphragm to the outer circumference part of diaphragm of the speaker diaphragm are provided. Thereby, unnecessary vibration caused by lack of the rigidity of the diaphragm can be prevented, and a possibility that the reinforcement board comes off or falls off can be remarkably reduced.
    Type: Application
    Filed: January 31, 2006
    Publication date: August 17, 2006
    Applicant: Sony Corporation
    Inventor: Takao Sakamoto
  • Publication number: 20060046363
    Abstract: A semiconductor device fabricating method includes forming an amorphous silicon film on a substrate irradiating the amorphous silicon film with laser light to transform at least a part of the amorphous silicon film into a polycrystalline silicon film, and oxidizing the surface of the polycrystalline silicon film in an atmosphere including oxygen, after the irradiation. The laser light is a linear beam having an energy-density gradient of at least 3 (mJ/cm2)/?m in a widthwise direction, and the linear beam is generated by transforming pulsed laser light with a wavelength in a range between 350 nm and 800 nm. The oxidation is performed in a saturated water vapor ambient at a pressure of at least 10 atmospheres and at a temperature in a range between 500° C. and 650° C. With this method, a semiconductor device with excellent crystallinity can be easily fabricated.
    Type: Application
    Filed: August 31, 2004
    Publication date: March 2, 2006
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Mitsuo Inoue, Osamu Miyakawa, Takao Sakamoto
  • Publication number: 20050263770
    Abstract: A first thin film transistor including a gate electrode, a source region, a drain region, a GOLD region, and a channel region is formed at a first region at a TFT array substrate. A second thin film transistor including a gate electrode, a source region, drain region, a GOLD region, and a channel region is formed at a second region. The GOLD length (0.5 ?m) of the GOLD region of the second thin film transistor is set shorter than the GOLD length (1.5 ?m) of the GOLD region of the first thin film transistor. Accordingly, a semiconductor device directed to reducing the area occupied by semiconductor elements is obtained.
    Type: Application
    Filed: May 26, 2005
    Publication date: December 1, 2005
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazuyuki Sugahara, Naoki Nakagawa, Yoshihiko Toyoda, Takao Sakamoto
  • Publication number: 20050253195
    Abstract: A silicon nitride film and a silicon oxide film are formed on a glass substrate. On the silicon oxide film is formed a thin film transistor including a source region, a drain region, a channel region having a predetermined channel length, a GOLD region and an LDD region having an impurity concentration lower than the impurity concentration of the source region, a GOLD region and an LDD region having an impurity concentration lower than the impurity concentration of the drain region, a gate insulation film, and a gate electrode. The gate electrode is formed overlapping with and facing the channel region and the GOLD region. A semiconductor device is obtained, directed to improving source-drain breakdown voltage and AC stress resistance, and achieving desired current property.
    Type: Application
    Filed: April 20, 2005
    Publication date: November 17, 2005
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Yoshihiko Toyoda, Takao Sakamoto, Kazuyuki Sugahara, Naoki Nakagawa
  • Publication number: 20050236618
    Abstract: A silicon nitride film and a silicon oxide film are formed on a glass substrate. On the silicon oxide film is formed a thin film transistor T including a source region, a drain region, a channel region having a predetermined channel length, a first GOLD region having an impurity concentration lower than the impurity concentration of the source region, a second GOLD region having an impurity concentration lower than the impurity concentration of the drain region, a gate insulation film, and a gate electrode. The length of an overlapping portion in plane between the gate electrode and the second GOLD region in the direction of the channel length is set longer than the length in the direction of the channel region of an overlapping portion in plane between the gate electrode and the first GOLD region.
    Type: Application
    Filed: March 29, 2005
    Publication date: October 27, 2005
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Yoshihiko Toyoda, Takao Sakamoto, Kazuyuki Sugahara
  • Publication number: 20050067553
    Abstract: A reflective liquid crystal display device is integrated with a liquid crystal display panel (1), detects display surface illuminance by a plurality of light sensors (10) provided in the vicinity of the display surface, and in accordance with the detection result, controls luminous intensity of a front light (lighting means) (19) using a lighting control circuit (22) so that the display surface illuminance becomes a predetermined magnitude. Even if the use environment of the reflective liquid crystal display device changes, or more specifically, intensity of external light shone from outside of the device into the display surface varies, the configuration allows controlling automatically the amount of emission from the front light to automatically maintain an appropriate display luminance and to reduce electric power consumption.
    Type: Application
    Filed: December 9, 2002
    Publication date: March 31, 2005
    Inventors: Masafumi Agari, Mitsuo Inoue, Takashi Yamamoto, Shigeyuki Yoshida, Takao Sakamoto
  • Publication number: 20040034104
    Abstract: 2,2-Diphenylbutanamide derivatives represented by the following formula (1): 1
    Type: Application
    Filed: April 14, 2003
    Publication date: February 19, 2004
    Inventors: Susumu Sato, Tetsuo Oka, Takao Sakamoto, Yoshihiko Kanamaru, Kinichi Mogi, Shinichi Morimoto, Norimitsu Umehara, Junzo Kamei
  • Patent number: 6632749
    Abstract: The method for manufacturing a silicon oxide film is characterized in that the method includes the steps of forming the silicon oxide film by a vapor deposition method or the like and of irradiating infrared light onto this silicon oxide film. Thus, according to the present invention, a silicon oxide film of relatively low quality formed at relatively low temperature can be improved to be a silicon oxide film of high quality. When the present invention is applied to a thin-film semiconductor device, a semiconductor device of high operational reliability and high performance can be manufactured.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: October 14, 2003
    Assignees: Seiko Epson Corporation, Mitsubishi Denki Kabushiki Kaisya
    Inventors: Mitsutoshi Miyasaka, Takao Sakamoto
  • Patent number: 6517422
    Abstract: A polishing apparatus which attaches the semi-conductor wafers 5 to the polishing plate 4 for performing the polishing as applying pressure the polishing cloth with the semi-conductor wafers, is provided with a guide ring 7 disposed outside of the polishing plate for pressing the polishing cloth separately from the polishing plate, a retainer ring 8 provided at the lower end of the guide ring for contacting the polishing cloth, and a weight 9 detachably mounted on the upper surface of the guide ring for adjusting the pressure to the polishing cloth.
    Type: Grant
    Filed: March 6, 2001
    Date of Patent: February 11, 2003
    Assignee: Toshiba Ceramics Co., Ltd.
    Inventors: Takao Sakamoto, Shinya Kawamoto, Katsuaki Kotari, Katsuyoshi Kojima, Masayoshi Saitou, Yoshihiko Hoshi
  • Publication number: 20020119607
    Abstract: The method for manufacturing a silicon oxide film is characterized in that the method includes the steps of forming the silicon oxide film by a vapor deposition method or the like and of irradiating infrared light onto this silicon oxide film. Thus, according to the present invention, a silicon oxide film of relatively low quality formed at relatively low temperature can be improved to be a silicon oxide film of high quality. When the present invention is applied to a thin-film semiconductor device, a semiconductor device of high operational reliability and high performance can be manufactured.
    Type: Application
    Filed: April 29, 2002
    Publication date: August 29, 2002
    Applicant: Seiko Epson Corporation
    Inventors: Mitsutoshi Miyasaka, Takao Sakamoto
  • Patent number: 6407012
    Abstract: The method for manufacturing a silicon oxide film is characterized in that the method includes the steps of forming the silicon oxide film by a vapor deposition method or the like and of irradiating infrared light onto this silicon oxide film. Thus, according to the present invention, a silicon oxide film of relatively low quality formed at relatively low temperature can be improved to be a silicon oxide film of high quality. When the present invention is applied to a thin-film semiconductor device, a semiconductor device of high operational reliability and high performance can be manufactured.
    Type: Grant
    Filed: August 25, 1999
    Date of Patent: June 18, 2002
    Assignees: Seiko Epson Corporation, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Mitsutoshi Miyasaka, Takao Sakamoto