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).

  • Patent number: 7635952
    Abstract: In a process in which a current is supplied from a switching regulator to multi-chip LEDs, the forward voltages of the LEDs are respectively detected in forward detecting circuits. The detected values are sent to a microcomputer. In the microcomputer, detected values when the multi-chip LEDs are initially turned on are stored as initial values. A first abnormality deciding value is set from the initial value. The detected values are sequentially stored as updated values. Second abnormality deciding values having conditions stricter than those of the first abnormality deciding value are sequentially set in accordance with the stored updated value. A read value is compared with the first abnormality deciding value or the read value is compared with the second abnormality deciding value to decide whether or not the abnormality of the LEDs is present. When it is decided that the LEDs are abnormal, an LED is turned on to inform a driver of the presence of the abnormality.
    Type: Grant
    Filed: October 16, 2006
    Date of Patent: December 22, 2009
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Hitoshi Takeda, Toru Nakayama, Masayasu Ito
  • Patent number: 7636037
    Abstract: A vehicle lighting apparatus includes a plurality of semiconductor light sources that are connected with each other in series, a switching regulator for supplying an electric power from a power source to each of said plurality of semiconductor light sources, forward voltage detection circuitry for detecting a forward voltage of each group by dividing said plurality of semiconductor light sources into groups; and failure detection circuitry for detecting the failure of the semiconductor light sources belonging to said each group based on the detected output of said each forward voltage detection circuitry.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: December 22, 2009
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Masayasu Ito, Hitoshi Takeda
  • Patent number: 7626275
    Abstract: A semiconductor device includes a semiconductor substrate, a first metal film on a back surface of the semiconductor substrate, a second metal film on the first metal film, and a third metal film on the second metal film. The first metal film forms an alloy with a solder. The second metal film causes isothermal solidification of the solder. The third metal film improves solder wetting properties or inhibits oxidation. Further, in a method for die-bonding a semiconductor device, a specific metal is diffused into a solder, when the solder melts, to transform the solder into a high melting point alloy, thereby causing isothermal solidification of the solder. The specific metal is different from the metal of the solder.
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: December 1, 2009
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masayasu Ito, Katsumi Miyawaki, Junji Fujino
  • Publication number: 20090223646
    Abstract: An apparatus for melting metals comprises a hearth for melting a metal raw material, a mold for forming an ingot by cooling the molten metal therein, the mold having a bottom, and a base unit for pulling down the ingot and provided at the bottom of the mold. The base unit has a surface provided with a concave portion at an optional location, and the surface of the base unit surrounding the concave portion is inclined toward the concave portion.
    Type: Application
    Filed: September 29, 2006
    Publication date: September 10, 2009
    Inventors: Norio Yamamoto, Masayasu Ito, Takeshi Shiraki
  • Publication number: 20090200963
    Abstract: A lighting controller has current driving means which include a shunt resistor connected in series to each of multiple LEDs to detect an LED driving current, a PMOS transistor connected to the positive electrode side of each of the LEDs, and an amplifier for sending an output according to the result of comparison between the respectively detected driving current values and a reference value, and which subject each of the PMOS transistors to ON/OFF operation. Control means includes a Zener diode ZD1 and a Zener diode ZD2 for detecting an abnormality occurring in the current driving means and for sending the abnormality detection result. The control means controls the PMOS transistor to be turned OFF after elapse of a predetermined time upon receipt of the abnormality detection result.
    Type: Application
    Filed: February 3, 2009
    Publication date: August 13, 2009
    Applicant: Koito Manufacturing Co., Ltd.
    Inventors: Takayoshi Kitagawa, Yasushi Noyori, Masayasu Ito
  • Publication number: 20090167187
    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: Application
    Filed: December 23, 2008
    Publication date: July 2, 2009
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Takayoshi Kitagawa, Noriyuki Nakamura, Masayasu Ito
  • Publication number: 20090153059
    Abstract: A lighting controller of a lighting device for a vehicle includes a switching regulator for supplying a driving current to first to Nth (N is an integer of one or more) semiconductor light sources; first to Nth current driving portions; and a control portion. The first to Nth current driving portions include first to Nth current detecting portions connected in series to the semiconductor light sources and serving to detect the driving current respectively, first to Nth switching portions connected to positive electrode sides of the semiconductor light sources respectively, and first to Nth comparing portions for transmitting a comparing output corresponding to a result of a comparison, which is obtained by comparing values of the driving currents detected by the current detecting portions with a predetermined threshold respectively. The first to Nth current driving portions serve to carry out operations of the switching portions corresponding to the comparing output respectively.
    Type: Application
    Filed: December 15, 2008
    Publication date: June 18, 2009
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Takayoshi Kitagawa, Masayasu Ito, Yasushi Noyori
  • Publication number: 20090154188
    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: Application
    Filed: December 8, 2008
    Publication date: June 18, 2009
    Applicant: Koito Manufacturing Co., Ltd.
    Inventors: Masayasu Ito, Fuminori Shiotsu
  • Publication number: 20090129111
    Abstract: A vehicular lamp is arranged to save power by not driving a cooling fan when an LED is unlit. The vehicular lamp is capable of reducing cost and stopping a supply of current to the LED even in the case of open wiring in a supply of current to the cooling fan. The vehicular lamp includes LEDs connected in series, a cooling fan connected in series with the LEDs and arranged to cool the LEDs. A current supply circuit receives power supplied from a power source and supplies current to the LEDs and the cooling fan.
    Type: Application
    Filed: November 13, 2008
    Publication date: May 21, 2009
    Applicant: Koito Manufacturing Co., Ltd.
    Inventors: Masayasu Ito, Fuminori Shiotsu
  • Patent number: 7528553
    Abstract: A lighting control apparatus and a method of lighting control for a vehicle lighting device includes a semiconductor light source including a semiconductor light emitting element; and a current supply controller coupled between a power supply and the semiconductor light source. Supply of a current from the power supply to the semiconductor light source is restricted by the current supply controller during a current restriction period to a value smaller than a prescribed current. A microcomputer compares a forward voltage generated from the semiconductor light source during the current restriction period with an abnormality determination value to determine whether or not an abnormality occurs due to a change of the forward voltage of the semiconductor light source.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: May 5, 2009
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Masayasu Ito, Takanori Namba
  • Publication number: 20090072764
    Abstract: A lighting controlling device of vehicle lighting equipment includes switching regulators for supplying a current to a plurality of semiconductor light sources respectively; a plurality of current driving portions, having switching elements connected to the semiconductor light sources for controlling ON/OFF of the semiconductor light sources, for current-driving the semiconductor light sources at a maximum current value or a current value smaller than the maximum current value in response to respective operating states of the switching elements; current setting portion for setting a maximum current value applied in current-driving the current driving portion or a maximum current value of currents fed from the switching regulators to the semiconductor light sources separately in plural stages in response to respective assignments; and a controlling portion for controlling the current driving portion and the current setting portion in response to a plurality of lighting modes based on communication information
    Type: Application
    Filed: July 30, 2008
    Publication date: March 19, 2009
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Takayoshi Kitagawa, Masayasu Ito
  • Publication number: 20090043002
    Abstract: A thermoplastic resin sheet which has both a high reflectance ratio and excellent shape-holding property suitable for backlights and illumination boxes for use in illumination signboards, illumination fixtures and displays and illumination boxes. The thermoplastic resin foam is manufactured by a manufacturing method including a process for containing inert gas by holding thermoplastic resin sheet containing metallic oxide in a pressurized inert gas atmosphere and a process for heating the thermoplastic resin sheet in which the inert gas is contained at a temperature higher than the softening temperature of the thermoplastic resin, under normal pressure, and foaming the resin.
    Type: Application
    Filed: August 31, 2005
    Publication date: February 12, 2009
    Applicant: The Furukawa Electric Co., Ltd.
    Inventors: Kohji Masuda, Masayasu Ito, Naoki Yoshida
  • Patent number: 7489601
    Abstract: There is provided a disk drive including a base chassis, a first optical pickup mechanism including a disk rotation drive disposed on the base chassis, first optical pickup unit to write and/or read data to and/or from a first optical disk and a first pickup moving mechanism to move the first optical pickup unit radially of the first optical disk, a second optical pickup mechanism disposed opposite to the first optical pickup mechanism and including a second optical pickup unit to write and/or read data to and/or from a second optical disk and a second pickup moving mechanism to move the second optical pickup unit radially of the second optical disk, and a controlling means for detecting the movement of one of the optical pickup units and moving the other optical pickup unit to make weight balancing of the base chassis. Thus, the base chassis weight is balanced while one of the two optical pickup units is being moved.
    Type: Grant
    Filed: October 6, 2004
    Date of Patent: February 10, 2009
    Assignees: Sony Computer Entertainment, Inc., Sony Corporation
    Inventors: Kiyoshi Omori, Masayasu Ito, Aki Yoguchi, Kouji Shinohara, Akio Ishiwata, Masaki Nagatsuka, Toshikazu Kobayashi, Satoshi Mimura, Satoshi Muto, Toshisada Takada
  • Patent number: 7482765
    Abstract: When a forward direction voltage of any of several LEDs 14 to 20 is lowered, a drain voltage of an NMOS transistor 70 employed in any of series regulators 24 to 30 becomes higher than a defined voltage. A zener diode ZD1, which is connected to the LED where the abnormal condition occurs, becomes conductive. A voltage, which is increased from the defined voltage, is applied to a negative input terminal of a comparing amplifier 72, and an output voltage of the comparing amplifier 72 is lowered by this increased voltage portion so that a gate voltage of the NMOS transistor 70 is lowered. A current flowing through the NMOS transistor 70 is decreased. Even if an abnormal condition caused by a voltage drop occurs in any of the LEDs 14 to 20, then the LEDs 14 to 20 can be protected.
    Type: Grant
    Filed: July 11, 2006
    Date of Patent: January 27, 2009
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Masayasu Ito, Fuminori Shiotsu, Takanori Namba
  • Patent number: 7479743
    Abstract: A vehicle lighting apparatus includes a plurality of semiconductor light sources that are connected with each other in series, a switching regulator for supplying an electric power from a power source to each of said plurality of semiconductor light sources, forward voltage detection circuitry for detecting a forward voltage of each of said plurality of semiconductor light sources, and failure detection circuitry for detecting the failure of each of said semiconductor light sources based on the detected value of said forward voltage detection means. A semiconductor light source having a lower forward voltage is connected closer to a reference potential side of said power source among said plurality of semiconductor light sources.
    Type: Grant
    Filed: December 11, 2006
    Date of Patent: January 20, 2009
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Takanori Namba, Masayasu Ito
  • Publication number: 20090009088
    Abstract: In a process in which a control signal having a low level is output from an ON/OFF control circuit to series regulators connected to LEDs serving as lighting targets to turn ON the LEDs in accordance with digital communication information, the ON/OFF control circuit calculates a specified current value to be supplied to the LEDs serving as the lighting targets and compares the specified current value with a detected current value which is detected by a current detecting circuit, and outputs a stop signal to a control circuit on the assumption that a current flows without the series regulators with grounding generated on a cathode side of any of LEDs when the detected current value is greater than the specified current value. When the control circuit turns OFF an NMOS transistor in response to the stop signal, an operation of a switching regulator is stopped.
    Type: Application
    Filed: July 3, 2008
    Publication date: January 8, 2009
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Masayasu Ito, Takanori Namba
  • Publication number: 20080304279
    Abstract: A discharge lamp lighting unit and vehicle headlamp are provided. The discharge lamp lighting unit includes a case body comprising a fitting portion and a projection portion, the fitting portion and the projection portion arranged in an L-shaped configuration, the discharge lamp being connected to the discharge lamp lighting unit at the fitting portion of the case body, and the projection portion projecting in the emergent light direction alongside of the discharge lamp; and a plurality of lighting circuit components, at least one of which is arranged in the projection portion. The vehicle headlamp includes a lamp unit which includes a discharge lamp which emits light, a reflector which reflects the light from the discharge lamp in an emergent light direction, and a holding projection which is provided at an end of the reflector at which the discharge lamp is mounted; and the discharge lamp lighting unit.
    Type: Application
    Filed: June 5, 2008
    Publication date: December 11, 2008
    Applicant: KOITO MANUFACTURING CO., LTD.
    Inventors: Naoki Sugiura, Masayasu Ito
  • Publication number: 20080300334
    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 affinyty 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: Application
    Filed: December 13, 2005
    Publication date: December 4, 2008
    Applicant: The Furukawa Electric Co., Ltd.
    Inventors: Kohji Masuda, Masayasu Ito, Kojiro Inamori, Naoki Yoshida, Michiaki Kawakami, Hiroyuki Yamazaki, Hidehumi Miyagi, Yong Hoon Kim
  • Patent number: 7456590
    Abstract: A vehicular lamp used in an automobile includes: semiconductor light emitting elements for emitting light; a time measurement unit for measuring time in which the semiconductor light emitting elements continues to emit light; and a current supplying unit for supplying a supply current that increases as the time measured by the time measurement unit increases, to the semiconductor light emitting elements.
    Type: Grant
    Filed: April 26, 2004
    Date of Patent: November 25, 2008
    Assignee: Koito Manufacturing Co., Ltd
    Inventors: Hitoshi Takeda, Masayasu Ito
  • Patent number: 7443050
    Abstract: To control individually a plurality of loads to be turned on by combining a switching regulator with a charge pump circuit using some of the components of the switching regulator. An LED is controlled to be turned on by a switching regulator having an NMOS transistor connected to a transformer and a control circuit for generating an on/off signal. An LED is controlled to be turned on by a charge pump circuit that shares the NMOS transistor and the control circuit with the switching regulator to charge a condenser with an electric charge during an operation for turning on the NMOS transistor and discharge the electric charge accumulated in the condenser during an operation for turning off the NMOS transistor. Thus, circuit structure is simplified.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: October 28, 2008
    Assignee: Koito Manufacturing Co., Ltd.
    Inventors: Masayasu Ito, Fuminori Shiotsu