Patents by Inventor Kiyoto Sudo
Kiyoto Sudo 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: 9286860Abstract: An image display apparatus includes a light source device, a light source control unit which controls power supplied to the light source device and an image light emission unit which, utilizing a source light emitted from the light source device, emits an image light. A light quantity measurement unit measures a quantity of the source light. A power/light quantity characteristic derivation unit derives a power/light quantity characteristic. A light quantity adjustment unit, based on the power/light quantity characteristic, adjusts the quantity of the source light or the image light. The light source control unit controls the supplied power to gradually change the light quantity of the source light. The light quantity measurement unit measures the light quantity of the gradually changing source light and acquires light quantity data. The power/light quantity characteristic derivation unit, based on the light quantity data and the supplied power, derives the power/light quantity characteristic.Type: GrantFiled: April 16, 2014Date of Patent: March 15, 2016Assignee: SEIKO EPSON CORPORATIONInventor: Kiyoto Sudo
-
Publication number: 20140225937Abstract: An image display apparatus includes a light source device, a light source control unit which controls power supplied to the light source device and an image light emission unit which, utilizing a source light emitted from the light source device, emits an image light. A light quantity measurement unit measures a quantity of the source light. A power/light quantity characteristic derivation unit derives a power/light quantity characteristic. A light quantity adjustment unit, based on the power/light quantity characteristic, adjusts the quantity of the source light or the image light. The light source control unit controls the supplied power to gradually change the light quantity of the source light. The light quantity measurement unit measures the light quantity of the gradually changing source light and acquires light quantity data. The power/light quantity characteristic derivation unit, based on the light quantity data and the supplied power, derives the power/light quantity characteristic.Type: ApplicationFiled: April 16, 2014Publication date: August 14, 2014Applicant: SEIKO EPSON CORPORATIONInventor: Kiyoto SUDO
-
Patent number: 8733946Abstract: An image display apparatus includes a light source device, a light source control unit which controls power supplied to the light source device and an image light emission unit which, utilizing a source light emitted from the light source device, emits an image light. A light quantity measurement unit measures a quantity of the source light. A power/light quantity characteristic derivation unit derives a power/light quantity characteristic. A light quantity adjustment unit, based on the power/light quantity characteristic, adjusts the quantity of the source light or the image light. The light source control unit controls the supplied power to gradually change the light quantity of the source light. The light quantity measurement unit measures the light quantity of the gradually changing source light and acquires light quantity data. The power/light quantity characteristic derivation unit, based on the light quantity data and the supplied power, derives the power/light quantity characteristic.Type: GrantFiled: December 17, 2008Date of Patent: May 27, 2014Assignee: Seiko Epson CorporationInventor: Kiyoto Sudo
-
Patent number: 8198573Abstract: A light source device includes: a plurality of light emission units which emit light; a scattering unit which scatters at least a part of light received from the plural light emission units; a light detecting unit which detects a part of light emitted from the plural light emission units and scattered by the scattering unit; and a control unit which controls the plural light emission units based on detection result from the light detecting unit.Type: GrantFiled: February 9, 2009Date of Patent: June 12, 2012Assignee: Seiko Epson CorporationInventors: Shunji Kamijima, Kiyoto Sudo
-
Patent number: 8094100Abstract: A laser light source device which is used for a video display device displaying video by using plural image frame data inputted from an image generating device includes a laser light source emitting laser light, a drive circuit driving the laser light source, a target light amount acquisition unit that acquires a target light amount which is a light amount necessary for displaying the image frame data, an output light amount detecting unit that detects an output light amount of the laser light source device, a control unit that controls the drive circuit so that the output light amount will be the target light amount, and a determination unit that determinates deterioration of the laser light source by using drive conditions of the drive circuit with respect to at least two different target light amounts at the time of control.Type: GrantFiled: December 12, 2008Date of Patent: January 10, 2012Assignee: Seiko Epson CorporationInventors: Kazuhisa Mizusako, Kiyoto Sudo
-
Patent number: 8040930Abstract: A drive circuit for driving a semiconductor light emitting element includes a board, a first pattern formed in a first layer of the board so as to be electrically connected to an anode of the semiconductor light emitting element, and a second pattern formed in a second layer of the board so as to be electrically connected to a cathode of the semiconductor light emitting element, and the first pattern and the second pattern are formed so as to overlap with each other when viewed in a direction along a normal line of the board.Type: GrantFiled: August 12, 2008Date of Patent: October 18, 2011Assignee: Seiko Epson CorporationInventors: Kazuhisa Mizusako, Kiyoto Sudo
-
Patent number: 7848373Abstract: A drive circuit for a semiconductor light emitting element used for a light source device adapted to output a laser beam converted using a wavelength conversion element adapted to generate a second harmonic wave, includes a switching element connected to a power supply, an inductor having one end connected to the power supply via the switching element, and the other end connected to the ground, a first terminal disposed between the switching element and the inductor, to which a cathode terminal of the semiconductor light emitting element is connected, and a second terminal disposed between the other terminal of the inductor and the ground, to which an anode terminal of the semiconductor light emitting element is connected.Type: GrantFiled: February 9, 2009Date of Patent: December 7, 2010Assignee: Seiko Epson CorporationInventor: Kiyoto Sudo
-
Patent number: 7813393Abstract: A light source device includes a semiconductor laser, and a drive circuit supplying the semiconductor laser with a pulsed drive current, and in the semiconductor laser, a laser emitting element and a free wheel diode are formed on the same substrate, and a cathode of the free wheel diode is connected to a current input terminal of the laser emitting element, and an anode of the free wheel diode is connected to a current output terminal of the laser emitting element.Type: GrantFiled: July 9, 2008Date of Patent: October 12, 2010Assignee: Seiko Epson CorporationInventor: Kiyoto Sudo
-
Patent number: 7680165Abstract: A light source device includes: a plurality of laser light sources that emit laser light; and a light source driving section that drives at least one of the laser light sources by a first driving value that is a value less than a threshold level of at least one of the laser light sources, or by a second driving value that is a value greater than a threshold level of at least one of the laser light sources, and that varies at least one of the number of laser light sources that are driven by the first driving value and the number of laser light sources that are driven by the second driving value in the laser light sources, thereby controlling the total output of laser light emitted from the laser light sources.Type: GrantFiled: April 9, 2008Date of Patent: March 16, 2010Assignee: Seiko Epson CorporationInventors: Akira Egawa, Kiyoto Sudo, Kazuhisa Mizusako
-
Publication number: 20090243494Abstract: A light source device includes: a plurality of light emission units which emit light; a scattering unit which scatters at least a part of light received from the plural light emission units; a light detecting unit which detects a part of light emitted from the plural light emission units and scattered by the scattering unit; and a control unit which controls the plural light emission units based on detection result from the light detecting unit.Type: ApplicationFiled: February 9, 2009Publication date: October 1, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Shunji KAMIJIMA, Kiyoto SUDO
-
Patent number: 7593438Abstract: A driving method for laser light source device includes: providing a laser light source device including a laser light source, a wavelength conversion element converting the wavelength of the light emitted from the laser light source, and a resonator mirror constituting a resonator structure between the laser light source and the resonator mirror; and driving the laser light source so as to cause the amount of light to decrease depending on the passage of time, compared with the amount of light by the initial driving of the laser light source.Type: GrantFiled: November 27, 2007Date of Patent: September 22, 2009Assignee: Seiko Epson CorporationInventors: Kazuhisa Mizusako, Kiyoto Sudo
-
Publication number: 20090232175Abstract: A drive circuit for a semiconductor light emitting element used for a light source device adapted to output a laser beam converted using a wavelength conversion element adapted to generate a second harmonic wave, includes a switching element connected to a power supply, an inductor having one end connected to the power supply via the switching element, and the other end connected to the ground, a first terminal disposed between the switching element and the inductor, to which a cathode terminal of the semiconductor light emitting element is connected, and a second terminal disposed between the other terminal of the inductor and the ground, to which an anode terminal of the semiconductor light emitting element is connected.Type: ApplicationFiled: February 9, 2009Publication date: September 17, 2009Applicant: SEIKO EPSON CORPORATIONInventor: Kiyoto SUDO
-
Publication number: 20090153447Abstract: A laser light source device which is used for a video display device displaying video by using plural image frame data inputted from an image generating device includes a laser light source emitting laser light, a drive circuit driving the laser light source, a target light amount acquisition unit that acquires a target light amount which is a light amount necessary for displaying the image frame data, an output light amount detecting unit that detects an output light amount of the laser light source device, a control unit that controls the drive circuit so that the output light amount will be the target light amount, and a determination unit that determinates deterioration of the laser light source by using drive conditions of the drive circuit with respect to at least two different target light amounts at the time of control.Type: ApplicationFiled: December 12, 2008Publication date: June 18, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Kazuhisa MIZUSAKO, Kiyoto SUDO
-
Publication number: 20090153063Abstract: An image display apparatus includes a light source device, a light source control unit which controls power supplied to the light source device and an image light emission unit which, utilizing a source light emitted from the light source device, emits an image light. A light quantity measurement unit measures a quantity of the source light. A power/light quantity characteristic derivation unit derives a power/light quantity characteristic. A light quantity adjustment unit, based on the power/light quantity characteristic, adjusts the quantity of the source light or the image light. The light source control unit controls the supplied power to gradually change the light quantity of the source light. The light quantity measurement unit measures the light quantity of the gradually changing source light and acquires light quantity data. The power/light quantity characteristic derivation unit, based on the light quantity data and the supplied power, derives the power/light quantity characteristic.Type: ApplicationFiled: December 17, 2008Publication date: June 18, 2009Applicant: SEIKO EPSON CORPORATIONInventor: Kiyoto SUDO
-
Publication number: 20090059981Abstract: A drive circuit for driving a semiconductor light emitting element includes a board, a first pattern formed in a first layer of the board so as to be electrically connected to an anode of the semiconductor light emitting element, and a second pattern formed in a second layer of the board so as to be electrically connected to a cathode of the semiconductor light emitting element, and the first pattern and the second pattern are formed so as to overlap with each other when viewed in a direction along a normal line of the board.Type: ApplicationFiled: August 12, 2008Publication date: March 5, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Kazuhisa MIZUSAKO, Kiyoto SUDO
-
Publication number: 20090041069Abstract: A light source device includes a semiconductor laser, and a drive circuit supplying the semiconductor laser with a pulsed drive current, and in the semiconductor laser, a laser emitting element and a free wheel diode are formed on the same substrate, and a cathode of the free wheel diode is connected to a current input terminal of the laser emitting element, and an anode of the tree wheel diode is connected to a current output terminal of the laser emitting element.Type: ApplicationFiled: July 9, 2008Publication date: February 12, 2009Applicant: SEIKO EPSON CORPORATIONInventor: Kiyoto SUDO
-
Publication number: 20080253418Abstract: A light source device includes: a plurality of laser light sources that emit laser light; and a light source driving section that drives at least one of the laser light sources by a first driving value that is a value less than a threshold level of at least one of the laser light sources, or by a second driving value that is a value greater than a threshold level of at least one of the laser light sources, and that varies at least one of the number of laser light sources that are driven by the first driving value and the number of laser light sources that are driven by the second driving value in the laser light sources, thereby controlling the total output of laser light emitted from the laser light sources.Type: ApplicationFiled: April 9, 2008Publication date: October 16, 2008Applicant: SEIKO EPSON CORPORATIONInventors: Akira Egawa, Kiyoto Sudo, Kazuhisa Mizusako
-
Publication number: 20080130693Abstract: A driving method for laser light source device includes: providing a laser light source device including a laser light source, a wavelength conversion element converting the wavelength of the light emitted from the laser light source, and a resonator mirror constituting a resonator structure between the laser light source and the resonator mirror, and driving the laser light source so as to cause the amount of light to decrease depending on the passage of time, compared with the amount of light by the initial driving of the laser light source.Type: ApplicationFiled: November 27, 2007Publication date: June 5, 2008Applicant: SEIKO EPSON CORPORATIONInventors: Kazuhisa Mizusako, Kiyoto Sudo