Patents by Inventor Kazuhiko Nagaoka
Kazuhiko Nagaoka 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).
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Patent number: 7872805Abstract: A lenticular lens medium forms a lenticular lens which includes a plurality of semicylindrical-shaped or arc-shaped elongated convex parts. The lenticular lens medium has a volume resistivity of 1×107-1×1014 ?·cm and a surface resistivity of 1×108-1×1015?/?.Type: GrantFiled: March 11, 2009Date of Patent: January 18, 2011Assignees: Oki Data Corporation, Kureha CorporationInventors: Takao Mizutani, Hirokazu Ando, Takehiko Okajima, Kazuhiko Nagaoka, Nobuo Wakasugi
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Patent number: 7852563Abstract: A lenticular lens medium forms a lenticular lens which comprises a plurality of semicylindrical-shaped or arc-shaped elongated convex parts. The lenticular lens medium has a volume resistivity of 1×107-1×1014?·cm and a surface resistivity of 1×108-1×1015?/?. The lenticular lens medium including the convex parts has a thickness of 0.3-3 mm.Type: GrantFiled: March 12, 2009Date of Patent: December 14, 2010Assignee: Oki Data CorporationInventors: Takao Mizutani, Hirokazu Ando, Takehiko Okajima, Kazuhiko Nagaoka, Nobuo Wakasugi
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Publication number: 20090231716Abstract: A lenticular lens medium forms a lenticular lens which comprises a plurality of semicylindrical-shaped or arc-shaped elongated convex parts. The lenticular lens medium has a volume resistivity of 1×107-1×1014 ?·cm and a surface resistivity of 1×108-1×1015 ?/?. The lenticular lens medium including the convex parts has a thickness of 0.3-3 mm.Type: ApplicationFiled: March 12, 2009Publication date: September 17, 2009Applicant: OKI DATA CORPORATIONInventors: Takao MIZUTANI, Hirokazu ANDO, Takehiko OKAJIMA, Kazuhiko NAGAOKA, Nobuo WAKASUGI
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Publication number: 20090231717Abstract: A lenticular lens medium forms a lenticular lens which includes a plurality of semicylindrical-shaped or arc-shaped elongated convex parts. The lenticular lens medium has a volume resistivity of 1×107-1×1014?·cm and a surface resistivity of 1×108-1×1015?/?.Type: ApplicationFiled: March 11, 2009Publication date: September 17, 2009Applicants: Oki Data Corporation, Kureha CorporationInventors: Takao Mizutani, Hirokazu Ando, Takehiko Okajima, Kazuhiko Nagaoka, Nobuo Wakasugi
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Patent number: 7119802Abstract: A compact-size driving voltage controller is provided which can be driven with low power. The compact-size driving voltage controller which can be driven with low power includes a High output operational amplifier and a Low output operational amplifier for supplying driving voltages VcomH, VcomL to a load such as a liquid crystal display panel, an output switch for alternating between the outputs of the operational amplifiers, a Low voltage setting operational amplifier for generating a set voltage to be supplied to the non-inverted input terminal of the Low output operational amplifier, a set voltage generator including a current mirror circuit and a clamping circuit, a bias current controller for controlling the bias current flowing in each operational amplifier with a predetermined timing, and a timing controller for controlling the changeover timing of the output switch.Type: GrantFiled: January 24, 2003Date of Patent: October 10, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Tooru Suyama, Tsutomu Sakakibara, Tomokazu Kojima, Tetsuro Ohmori, Yoshito Date, Yasuyuki Doi, Masahiro Akabori, Kenji Miyake, Miki Fujino, Takahito Kushima, Tsukasa Kawahara, Kazuhiko Nagaoka, Shinji Miyamoto, Yoshiyuki Konishi
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Patent number: 7119521Abstract: A multi-output DC-DC converter comprising a plurality of converters configured so that an inductor 2 and a main switch 31 are used in common, wherein a first output voltage Vo1 is output from a circuit comprising a diode 41 and a first output capacitor 51, and a second output voltage Vo2 is output from a circuit comprising an auxiliary switch 32, a diode 42 and a second output capacitor 52. The control circuit 80 of the multi-output DC-DC converter has an output detection circuit 81, an oscillation circuit 82, a PWM circuit 83, a frequency divider circuit 84 and a drive circuit 85, and controls a plurality of outputs at high efficiency and reliability.Type: GrantFiled: March 29, 2004Date of Patent: October 10, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Takuya Ishii, Hiroshi Saito, Kazuhiko Nagaoka
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Patent number: 6998825Abstract: An inductor 6 accumulates an energy therein or releases the accumulated energy according to the state of a main switch element 10 being turned ON/OFF. When the inductor 6 releases an energy, if a sub-switch element 12 is in the ON state, a current is passed through a circuit downstream of the sub-switch element 12, thereby increasing an output voltage VO1. The sub-switch element 12 is a P-channel MOS transistor, and a sub-switch control circuit 18 outputs a control signal VCT1 for the sub-switch element 12. A level shift circuit 19 receives an output-side potential VP of the inductor 6, and outputs, as a control signal VG1 applied to the gate of the sub-switch element 12, the potential VP if the control signal VCT1 is at the L level or a potential (VP?VM) lower than the potential VP if the control signal VCT1 is at the H level. Thus, the output voltage of the DC-DC converter can be made precisely equal to the target voltage.Type: GrantFiled: November 12, 2004Date of Patent: February 14, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kazuhiko Nagaoka, Satoshi Wada, Tsukasa Kawahara
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Publication number: 20050104565Abstract: An inductor 6 accumulates an energy therein or releases the accumulated energy according to the state of a main switch element 10 being turned ON/OFF. When the inductor 6 releases an energy, if a sub-switch element 12 is in the ON state, a current is passed through a circuit downstream of the sub-switch element 12, thereby increasing an output voltage VO1. The sub-switch element 12 is a P-channel MOS transistor, and a sub-switch control circuit 18 outputs a control signal VCT1 for the sub-switch element 12. A level shift circuit 19 receives an output-side potential VP of the inductor 6, and outputs, as a control signal VG1 applied to the gate of the sub-switch element 12, the potential VP if the control signal VCT1 is at the L level or a potential (VP-VM) lower than the potential VP if the control signal VCT1 is at the H level. Thus, the output voltage of the DC-DC converter can be made precisely equal to the target voltage.Type: ApplicationFiled: November 12, 2004Publication date: May 19, 2005Inventors: Kazuhiko Nagaoka, Satoshi Wada, Tsukasa Kawahara
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Publication number: 20050088160Abstract: A multi output DC-DC converter is provided with a main switch which is turned ON and OFF at a predetermined cycle, and applies the input DC voltage of the DC power source to the inductor when turned ON; a plurality of diodes which rectify a voltage generated in the inductor when the main switch is off; an auxiliary switch connected in series to each of the plurality of diodes; and a plurality of capacitors connected to the respective series circuits of the plurality of diodes and the auxiliary switch, which respectively output a plurality of output voltages. And a control circuit performs a time-division control of turning the main switch ON and OFF in the predetermined cycle, and of selecting one of the plurality of auxiliary switches in the predetermined cycle, to thereby output an output voltage through the selected auxiliary switch, and, in the case where an enable signal is instructing to stop, forcefully turns OFF the auxiliary switch corresponding to the enable signal.Type: ApplicationFiled: September 17, 2004Publication date: April 28, 2005Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Jun Tanaka, Tsukasa Kawahara, Kazuhiko Nagaoka, Satoshi Wada, Shusaku Gotou
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Publication number: 20040196676Abstract: A multi-output DC-DC converter comprising a plurality of converters configured so that an inductor 2 and a main switch 31 are used in common, wherein a first output voltage Vo1 is output from a circuit comprising a diode 41 and a first output capacitor 51, and a second output voltage Vo2 is output from a circuit comprising an auxiliary switch 32, a diode 42 and a second output capacitor 52. The control circuit 80 of the multi-output DC-DC converter has an output detection circuit 81, an oscillation circuit 82, a PWM circuit 83, a frequency divider circuit 84 and a drive circuit 85, and controls a plurality of outputs at high efficiency and reliability.Type: ApplicationFiled: March 29, 2004Publication date: October 7, 2004Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Takuya Ishii, Hiroshi Saito, Kazuhiko Nagaoka
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Publication number: 20030151581Abstract: The present invention provides a compact-size driving voltage controller which can be driven with low power. The compact-size driving voltage controller which can be driven with low power includes a High output operational amplifier and a Low output operational amplifier for supplying driving voltages VcomH, VcomL to a load such as a liquid crystal display panel, an output switch for alternating between the outputs of the operational amplifiers, a Low voltage setting operational amplifier for generating a set voltage to be supplied to the non-inverted input terminal of the Low output operational amplifier, a set voltage generator including a current mirror circuit and a clamping circuit, a bias current controller for controlling the bias current flowing in each operational amplifier with a predetermined timing, and a timing controller for controlling the changeover timing of the output switch.Type: ApplicationFiled: January 24, 2003Publication date: August 14, 2003Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Tooru Suyama, Tsutomu Sakakibara, Tomokazu Kojima, Tetsuro Ohmori, Yoshito Date, Yasuyuki Doi, Masahiro Akabori, Kenji Miyake, Miki Fujino, Takahito Kushima, Tsukasa Kawahara, Kazuhiko Nagaoka, Shinji Miyamoto, Yoshiyuki Konishi
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Patent number: 6571079Abstract: An image-recording apparatus has a plurality of image-forming sections. Each image forming section has a transfer point where a corresponding toner image is transferred from a photoconductive drum onto a print medium when the print medium passes through the transfer point. Each of the image-forming sections includes a surface that opposes the print medium and an electrically conductive film to which a high concentration of carbon black is contained and which is provided on the surface. The surface is downstream of the photoconductive drum with respect to a direction of travel of the print medium. The surface and print medium are spaced apart by a distance in the range of 1 to 3 mm and the electrically conductive member has a sheet resistance value of 15 k&OHgr;/□ to 10 M&OHgr;/□.Type: GrantFiled: August 31, 2001Date of Patent: May 27, 2003Assignee: Oki Data CorporationInventors: Kazuhiko Nagaoka, Nobutoshi Chigira, Toyokazu Shiraishi
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Patent number: 6552402Abstract: A composite MOS transistor device for a semiconductor integrated circuit includes at least a pair of MOS transistors, or first and second MOS transistors, placed on the same board. The first and second MOS transistors are made up of first and second groups of equally divided transistors with an equal gate width, respectively. These divided transistors are arranged in parallel to each other in the gate longitudinal direction. The divided transistors of these groups are arranged such that the sum of coordinates of respective gates, measured from a centerline, is equalized between these groups along the gate longitudinal direction. Since the sum of errors of respective gates along the length thereof becomes zero in each group of divided transistors, the current difference between the two MOS transistors can be eliminated.Type: GrantFiled: April 7, 1999Date of Patent: April 22, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masayuki Ozasa, Tatsuo Okamoto, Hidehiko Kurimoto, Shiro Dosho, Kazuhiko Nagaoka
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Publication number: 20020051658Abstract: An image-recording apparatus has a plurality of image-forming sections. Each image forming section has a transfer point where a corresponding toner image is transferred from a photoconductive drum onto a print medium when the print medium passes through the transfer point. Each of the image-forming sections includes a surface that opposes the print medium and an electrically conductive film to which a high concentration of carbon black is contained and which is provided on the surface. The surface is downstream of the photoconductive drum with respect to a direction of travel of the print medium. The surface and print medium are spaced apart by a distance in the range of 1 to 3 mm and the electrically conductive member has a sheet resistance value of 15 k&OHgr;/□ to 10 M&OHgr;/□.Type: ApplicationFiled: August 31, 2001Publication date: May 2, 2002Inventors: Kazuhiko Nagaoka, Nobutoshi Chigira, Toyokazu Shiraishi
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Patent number: 6285384Abstract: 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: GrantFiled: July 20, 1998Date of Patent: September 4, 2001Assignee: Oki Electric Industry Co., Ltd.Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Nobuo Wakasugi, Kazuhiko Nagaoka, Toshikazu Ito
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Patent number: 6215162Abstract: A composite MOS transistor device for a semiconductor integrated circuit includes at least a pair of MOS transistors, or first and second MOS transistors, placed on the same board. The first and second MOS transistors are made up of first and second groups of equally divided transistors with an equal gate width, respectively. These divided transistors are arranged in parallel to each other in the gate longitudinal direction. The divided transistors of these groups are arranged such that the sum of coordinates of respective gates, measured from a centerline, is equalized between these groups along the gate longitudinal direction. Since the sum of errors of respective gates along the length thereof becomes zero in each group of divided transistors, the current difference between the two MOS transistors can be eliminated.Type: GrantFiled: April 7, 1999Date of Patent: April 10, 2001Assignee: Matsushita Electronics CorporationInventors: Masayuki Ozasa, Tatsuo Okamoto, Hidehiko Kurimoto, Shiro Dosho, Kazuhiko Nagaoka
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Patent number: 6097925Abstract: An electrophotographic printer includes a transfer roller which rotates in contact with a cylindrical photoconductive drum. When print paper passes through a transfer point where the transfer roller is in contact with the photoconductive drum, a toner image on the photoconductive drum is transferred from the photoconductive drum to the print paper. A paper guide is disposed upstream of the transfer point with respect to a transport path of the print paper. The paper guide changes the direction of travel of the print paper so that the leading end portion of the print paper enters the transfer point in a direction substantially tangent to a circumferential surface of the photoconductive drum.Type: GrantFiled: November 5, 1998Date of Patent: August 1, 2000Assignee: Oki Data CorporationInventors: Kazuhiko Nagaoka, Koji Ida
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Patent number: 5943533Abstract: A method of forming an electrostatic latent image includes printing operation and toner recovering operation. The printing operation includes charging, forming an electrostatic latent image, developing, and transferring operations. The toner recovering operation includes the step of charging the photosensitive drum in timed relation to the rotation of the photosensitive drum after printing operation so that reversely charged toner deposited on the charging roller migrates from the charging roller to the photosensitive drum. The toner migrated from the charging roller to the photosensitive drum is recovered into a developer. An apparatus for forming an image includes a charging roller, photosensitive drum, developing roller, and transfer roller.Type: GrantFiled: February 17, 1998Date of Patent: August 24, 1999Assignee: Oki Data CorporationInventors: Syuichiro Ogata, Yoshitatsu Okiyama, Kazuyoshi Yoshida, Toru Ishihara, Kuniharu Hayashi, Hiroyuki Yajima, Mikio Yamamoto, Takashi Itaya, Masanori Maekawa, Kazuhiko Nagaoka
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Patent number: 5887220Abstract: When an electrophotographic printer is manufactured, the initial electrical resistance of its transfer roller is measured and a corresponding value is stored in a memory device in the printer. During operation, the printer's control program estimates the resistance of the transfer roller from the stored value, taking aging into account, then measures the actual resistance of the transfer roller, and infers ambient conditions from the difference between the estimated and actual resistance values. The electrophotographic printer is controlled according to the inferred ambient conditions.Type: GrantFiled: April 16, 1998Date of Patent: March 23, 1999Assignee: Oki Data CorporationInventor: Kazuhiko Nagaoka
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Patent number: 5818488Abstract: 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: GrantFiled: May 31, 1995Date of Patent: October 6, 1998Assignee: Oki Electric Industry Co., Ltd.Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Nobuo Wakasugi, Kazuhiko Nagaoka, Toshikazu Ito