Patents by Inventor Masayasu Ito

Masayasu Ito 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: 20140265890
    Abstract: Disclosed is a light source control device including a power conversion unit and a control unit. The power conversion unit includes a transfer capacitor provided between a primary side circuit and a secondary side circuit. The primary side circuit is configured such that a first inductor stores energy when a first switching element is ON. The secondary side circuit is configured such that the second inductor limits a changing speed of the driving current. The power conversion unit is configured such that the driving current is raised when the first switching element is ON. The control unit turns OFF when the magnitude of the driving current exceeds the first threshold value, and turns ON the first switching element when the magnitude of the driving current falls below the second threshold value smaller than the first threshold value.
    Type: Application
    Filed: February 28, 2014
    Publication date: September 18, 2014
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Masayasu ITO, Takao MURAMATSU
  • Publication number: 20140252950
    Abstract: A semiconductor light source lighting circuit includes a voltage step-down unit configured to generate a drive voltage lower than an input voltage by turning on or off a first switching element in a voltage step-down mode, a voltage step-up unit configured to generate the drive voltage higher than the input voltage by turning on or off a second switching element in a voltage step-up mode, and a controller. The controller includes a charge pump unit configured to repeat charging from the drive voltage to a second capacitor and discharging from the charged second capacitor to the first capacitor in the voltage step-up mode, and a switch drive unit configured to apply a voltage higher than the voltage at the other end of the first switching element to the control terminal of the first switching element by using a voltage of the charged first capacitor.
    Type: Application
    Filed: March 5, 2014
    Publication date: September 11, 2014
    Applicants: PANASONIC CORPORATION, KOITO MANUFACTURING CO., LTD.
    Inventors: Satoshi KIKUCHI, Takanori NAMBA, Masayasu ITO, Daijiro ARISAWA, Mikio MOTOMORI
  • Publication number: 20140139988
    Abstract: A portable electronic device 100 includes a horizontally long casing, both ends of which are gripped by a user's both hands, respectively. The device further includes a LCD fit into the front face of the casing 10. Outwardly projecting bulges are respectively formed at both sides of the rear face of the casing where fingers of the user gripping the casing 10 placed. Since the fingers and palms are naturally flexed to fit to the dome-like bulges 42L, 42R, the portable electronic device 100 fits comfortably in the user's hands. The operability is hard to be degraded even if the device is vibrated strongly during a game play with the device.
    Type: Application
    Filed: January 24, 2014
    Publication date: May 22, 2014
    Applicant: Sony Computer Entertainment Inc.
    Inventors: Shinichi Ogasawara, Masayasu Ito, Hajime Ishihara, Nobutoshi Hamada, Shuuichi Miyazaki
  • Patent number: 8710769
    Abstract: A discharge lamp lighting circuit includes a DC/DC converter which generates from an input voltage a drive voltage to be applied to a discharge lamp of a driven object. A first drive voltage generating path has one end to which the input voltage is applied, and at the other end of which is an output capacitor on an output side of the DC/DC converter. A second drive voltage generating path has one end to which the input voltage is applied, and at the other end of which is the output capacitor. The second drive voltage generating path is different from the first drive voltage generating path. A control circuit controls ON/OFF of the first drive voltage generating path. The discharge lamp lighting circuit is arranged so that the voltage of the output capacitor when the first drive voltage generating path is in an ON-state becomes higher than the voltage of the output capacitor when the first drive voltage generating path is not so.
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: April 29, 2014
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Takao Muramatsu, Masayasu Ito
  • Patent number: 8672767
    Abstract: A portable electronic device 100 includes a horizontally long casing, both ends of which are gripped by a user's both hands, respectively. The device further includes a LCD fit into the front face of the casing 10. Outwardly projecting bulges are respectively formed at both sides of the rear face of the casing where fingers of the user gripping the casing 10 placed. Since the fingers and palms are naturally flexed to fit to the dome-like bulges 42L, 42R, the portable electronic device 100 fits comfortably in the user's hands. The operability is hard to be degraded even if the device is vibrated strongly during a game play with the device.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: March 18, 2014
    Assignees: Sony Corporation, Sony Computer Entertainment Inc.
    Inventors: Shinichi Ogasawara, Masayasu Ito, Hajime Ishihara, Nobutoshi Hamada, Shuuichi Miyazaki
  • Patent number: 8580000
    Abstract: The present invention provides an indirect heat-drying apparatus that is resistant to adhesion of the substance to be dried on heating pipes and gives a product having a desired and stabilized liquid content. The present invention relates to an indirect heat-drying apparatus, comprising two indirect-heating rotary dryers, i.e., the first and second indirect-heating rotary dryers that are arranged in series so that the dried substance from the first indirect-heating rotary dryer is supplied to and dried in the second indirect-heating rotary dryer as the substance to be dried; and a carrier gas-supplying means of supplying the carrier gas co-currently in the first indirect-heating rotary dryer and counter-currently in the second indirect-heating rotary dryer, with respect to the flow direction from the substance to be dried.
    Type: Grant
    Filed: August 21, 2008
    Date of Patent: November 12, 2013
    Assignees: Kobe Steel, Ltd., Tsukishima Kikai Co., Ltd.
    Inventors: Tetsuya Deguchi, Takuo Shigehisa, Masayasu Ito, Zenji Kato, Yuko Sugita
  • Publication number: 20130278165
    Abstract: A semiconductor light source lighting circuit is provided with: a switching regulator that generates a drive current of a semiconductor light source using a switching element; and a control circuit that controls ON/OFF of the switching element. The control circuit is provided with: a comparator that compares the drive current and a target value; a counter that counts a digital value in a count direction determined by a comparison result of the comparator; a digital-analog converter that converts the digital value into an analog signal; and a drive circuit that controls the ON/OFF of the switching element based on the analog signal. The counter counts the digital value at a speed determined by an ON/OFF cycle of the switching element.
    Type: Application
    Filed: April 4, 2013
    Publication date: October 24, 2013
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Satoshi Kikuchi, Takanori Namba, Masayasu Ito
  • Publication number: 20130088172
    Abstract: A circuit for lighting a semiconductor light source is provided. The circuit includes: a switching regulator including a switching element and configured to generate a drive current for the semiconductor light source using the switching element; and a control circuit configured to control on-off of the switching element such that the magnitude of the drive current comes close to a targeted value. The control circuit includes: a comparator configured to compare the magnitude of the drive current with the targeted value; an up/down counter configured to count a digital value in a counting-up direction or counting-down direction, based on a comparison result of the comparator; a digital-to-analog converter configured to convert the counted digital value into an analog signal; and a drive circuit configured to control on/off of the switching element based on the analog signal.
    Type: Application
    Filed: October 4, 2012
    Publication date: April 11, 2013
    Inventors: Satoshi Kikuchi, Fuminori Shiotsu, Takanori Namba, Masayasu Ito
  • Patent number: 8373401
    Abstract: A step-up/step-down DC-DC converter includes a control section to compare an output value from voltage decrease or increase sections and a preset target value. A computation circuit provides a voltage value resulting from subtracting a difference between the voltage value of the comparison result and a first preset voltage value from a first voltage value. A drive pulse generation section generates a drive pulse for turning on and off a voltage decrease switch and a voltage increase switch in response to the result of a comparison between the computation output voltage and a ramp wave. When the voltage value of the computation output voltage exists between the first voltage value and the second voltage value, the drive pulse generation section provides control to selectively switch the on and off operation of the voltage decrease switch and the on and off operation of the voltage increase switch.
    Type: Grant
    Filed: February 10, 2011
    Date of Patent: February 12, 2013
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Yusuke Kasaba, Masayasu Ito
  • Patent number: 8339046
    Abstract: A lighting control device of a lighting device for a vehicle includes a switching regulator for supplying a driving current to a semiconductor light source. The lighting control device also includes control means having a current detecting portion for detecting the driving current and serving to control dimming of the semiconductor light source in order to reduce a mean current of the driving current by repeating driving and stopping operations of the switching regulator at a high speed upon receipt of a dimming control signal. The current detecting portion has a current holding portion for holding the driving current, detected for a driving period of the switching regulator, for a stopping period after a passage of the driving period.
    Type: Grant
    Filed: December 23, 2009
    Date of Patent: December 25, 2012
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Yusuke Kasaba, Masayasu Ito
  • Patent number: 8314573
    Abstract: A discharge lamp lighting circuit facilitates carrying out re-ignition and addresses a problem than can arise due to an influence of a capacitor in an auxiliary lighting circuit. A driving voltage generating portion supplies an AC driving voltage to a discharge lamp to be a driving target. An auxiliary lighting circuit is provided on a terminal side of the discharge lamp. An auxiliary lighting capacitor, an auxiliary lighting resistor and a switch are provided in series between the terminal of the discharge lamp and a fixed voltage terminal. A control circuit controls a conducting state of the switch. The switch is brought into an ON state before the discharge lamp is turned ON, and is brought into an OFF state after the discharge lamp is turned ON.
    Type: Grant
    Filed: October 29, 2009
    Date of Patent: November 20, 2012
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Tomoyuki Ichikawa, Kazuki Saito, Masayasu Ito
  • Patent number: 8314160
    Abstract: A thermoplastic resin foam which has both high reflectance and superior shape-retention properties, suitable for use in backlights and illumination boxes for illumination signboards, lighting fixtures, displays and the like. The thermoplastic resin foam is manufactured by a manufacturing method including a procedure for holding a resin sheet composed of thermoplastic resin (A) and thermoplastic resin (B), which has a functional group having an affinity with thermoplastic resin (A), within a pressurized inert gas atmosphere to enable the resin sheet to contain inert gas, and a procedure for foaming by heating the resin sheet containing inert gas at a temperature higher than the softening temperature of thermoplastic resin, under normal pressure.
    Type: Grant
    Filed: December 13, 2005
    Date of Patent: November 20, 2012
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Kohji Masuda, Masayasu Ito, Kojiro Inamori, Naoki Yoshida, Michiaki Kawakami, Hiroyuki Yamazaki, Hidehumi Miyagi, Yong Hoon Kim
  • Publication number: 20120286687
    Abstract: A semiconductor light source lighting circuit includes a switching regulator that produces a drive current ILED with a switching element, and a control circuit that controls turning on and off of the switching element so that the magnitude of the drive current ILED approaches a target value. The control circuit includes an error comparator that compares the drive current ILED and the target value, an up/down counter that performs a counting operation, in which the control digital value is incremented or decremented based on the result of the comparison, a D/A converter that converts the control digital value into an analog duty ratio setting signal S4, and a drive circuit that controls the turning on and off of the switching element based on the signal S4. The up/down counter stops the counting operation when the switching regulator is brought into the inactive state.
    Type: Application
    Filed: May 9, 2012
    Publication date: November 15, 2012
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Satoshi KIKUCHI, Fuminori SHIOTSU, Takanori NAMBA, Masayasu ITO
  • Patent number: 8222839
    Abstract: A dimming control system 1 includes: light source units each having a respective LED; and a control unit connected to the light source units via power supply lines. The control unit is connected to each of the light source units in series. The control unit includes: switch portions that control dimming of the LEDs by repeating an ON/OFF operation in a predetermined cycle; current detection circuits and voltage detection circuits that detect a current or a voltage supplied via the power supply lines; and a CPU that determines there is an abnormality in the power supply lines or the light source units when a value of the detected current or voltage exceeds a predetermined range while the switch portions are ON.
    Type: Grant
    Filed: August 6, 2009
    Date of Patent: July 17, 2012
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Kentarou Murakami, Masayasu Ito
  • Publication number: 20120163002
    Abstract: A discharge lamp lighting device includes a discharge lamp, a circuit module configured to supply a voltage to the discharge lamp so as to turn on the discharge lamp, a case member configured to accommodate the circuit module, and a connecting member, in which the discharge lamp is mounted, configured to connect the discharge lamp to the circuit module. The circuit module includes a substrate. The connecting member is integrated with the substrate of the circuit module.
    Type: Application
    Filed: December 19, 2011
    Publication date: June 28, 2012
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Shohei Yanagidu, Masayasu Ito, Naoki Sugiura
  • Patent number: 8207675
    Abstract: A vehicle lamp includes: N semiconductor light sources, wherein N is an integer of 1 or more; M fans configured to cool the N semiconductor light sources, wherein M is an integer of 1 or more; N current supply units configured to supply first current to the N semiconductor light sources, respectively; and a control unit configured to receive electric power supplied from an electric power source and supply second current to the N current supply units. The control unit includes: N switch elements that correspond to the N semiconductor light sources; M switch elements that correspond to the M fans; and a control circuit configured to control fan drive current supplied to the fans through the switch elements and the second current. The fans are coupled to the control unit.
    Type: Grant
    Filed: December 8, 2008
    Date of Patent: June 26, 2012
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Masayasu Ito, Fuminori Shiotsu
  • Publication number: 20120087073
    Abstract: A portable electronic device 100 includes a horizontally long casing, both ends of which are gripped by a user's both hands, respectively. The device further includes a LCD fit into the front face of the casing 10. Outwardly projecting bulges are respectively formed at both sides of the rear face of the casing where fingers of the user gripping the casing 10 placed. Since the fingers and palms are naturally flexed to fit to the dome-like bulges 42L, 42R, the portable electronic device 100 fits comfortably in the user's hands. The operability is hard to be degraded even if the device is vibrated strongly during a game play with the device.
    Type: Application
    Filed: December 16, 2011
    Publication date: April 12, 2012
    Applicant: SONY COMPUTER ENTERTAINMENT INC.
    Inventors: Shinichi OGASAWARA, Masayasu ITO, Hajime ISHIHARA, Nobutoshi HAMADA, Shuuichi MIYAZAKI
  • Publication number: 20120056549
    Abstract: A discharge lamp lighting circuit includes a DC/DC converter which generates from an input voltage a drive voltage to be applied to a discharge lamp of a driven object. A first drive voltage generating path has one end to which the input voltage is applied, and at the other end of which is an output capacitor on an output side of the DC/DC converter. A second drive voltage generating path has one end to which the input voltage is applied, and at the other end of which is the output capacitor. The second drive voltage generating path is different from the first drive voltage generating path. A control circuit controls ON/OFF of the first drive voltage generating path. The discharge lamp lighting circuit is arranged so that the voltage of the output capacitor when the first drive voltage generating path is in an ON-state becomes higher than the voltage of the output capacitor when the first drive voltage generating path is not so.
    Type: Application
    Filed: September 2, 2011
    Publication date: March 8, 2012
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Takao Muramatsu, Masayasu Ito
  • Patent number: 8110989
    Abstract: A lighting controller of a lighting device for a vehicle includes M (M is an integer of one or more) switching regulators for supplying driving currents to first to Nth (N is an integer of one or more) semiconductor light sources; first to Nth current driving portions; a temperature detector; and a control circuit. The first to Nth current driving portions include first to Nth current detecting portions connected to the semiconductor light sources and serving to detect the driving currents respectively; and first to Nth switching portions connected to the semiconductor light sources respectively. The first to Nth current driving portions operates the switching portions corresponding to magnitudes of the driving currents detected by the current detecting portions respectively. The temperature detector detects a temperature and sends a temperature detecting signal when the detected temperature is equal to or higher than a pre-specified temperature.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: February 7, 2012
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Takayoshi Kitagawa, Noriyuki Nakamura, Masayasu Ito
  • Patent number: D688636
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: August 27, 2013
    Assignee: SMK Corporation
    Inventors: Ryotaro Oishi, Masayasu Ito, Sota Kawashima, Haruo Yoshida