Patents by Inventor Nobuaki Kaji

Nobuaki Kaji 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: 20220344897
    Abstract: In a semiconductor laser drive device, wiring inductance between a semiconductor laser and a laser driver is reduced. A substrate has a laser driver built inside. A semiconductor laser is mounted on one surface of a substrate of the semiconductor laser drive device and emits irradiation light from an irradiation surface. A connection wiring electrically connects the laser driver and the semiconductor laser with a wiring inductance of 0.5 nH or less. A passive component is disposed to face a side of the semiconductor laser having the least number of pads and connects to the semiconductor laser and the laser driver.
    Type: Application
    Filed: July 21, 2020
    Publication date: October 27, 2022
    Applicant: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Nobuaki KAJI, Tatsuya OIWA, Hirohisa YASUKAWA
  • Publication number: 20220294179
    Abstract: An object of the present technique is to improve safety in a semiconductor laser driving apparatus that diffuses laser light by a diffusion plate. A substrate incorporates a laser driver, and a semiconductor laser is mounted on one surface of the substrate. Connection wiring electrically connects the laser driver and the semiconductor laser to each other with a wiring inductance of 0.5 nanohenries or less. A diffusion plate diffuses laser light irradiated by the semiconductor laser. A transparent conductive film is formed on a predetermined surface of the diffusion plate. In addition, the laser driver drives the semiconductor laser to irradiate the laser light on the basis of an electric characteristic value of the conductive film.
    Type: Application
    Filed: July 20, 2020
    Publication date: September 15, 2022
    Applicant: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Kiyohisa SAKAI, Hirohisa YASUKAWA, Nobuaki KAJI
  • Publication number: 20220294181
    Abstract: To reduce the wiring inductance between a semiconductor laser and a laser driver in a semiconductor laser driving apparatus. A substrate incorporates a laser driver. A semiconductor laser is mounted on one surface of the substrate of a semiconductor laser driving apparatus to emit irradiation light from an irradiation surface. Connection wiring electrically connects the laser driver and the semiconductor laser to each other with a wiring inductance of 0.5 nanohenries or less. A first optical element is provided on the irradiation surface side of the semiconductor laser. A second optical element is provided outside the first optical element on the irradiation surface side of the semiconductor laser.
    Type: Application
    Filed: July 20, 2020
    Publication date: September 15, 2022
    Applicant: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Nobuaki KAJI, Hirohisa YASUKAWA
  • Publication number: 20220294182
    Abstract: An object of the present technique is to obtain excellent heat radiation characteristics with a simple structure in a semiconductor laser driving apparatus. A semiconductor laser driving apparatus includes a substrate, a laser driver, and a semiconductor laser. The substrate incorporates the laser driver. The semiconductor laser is mounted on one surface of the substrate. Connection wiring electrically connects the laser driver and the semiconductor laser to each other with a wiring inductance of 0.5 nanohenries or less. Side walls surround a region including the semiconductor laser on the surface of the substrate where the semiconductor laser is mounted. The side walls have a heat storage material therein.
    Type: Application
    Filed: June 8, 2020
    Publication date: September 15, 2022
    Applicant: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Hirohisa YASUKAWA, Nobuaki KAJI
  • Publication number: 20220285909
    Abstract: The present technique reduces the wiring inductance between a semiconductor laser and a laser driver in a semiconductor laser driving apparatus. A semiconductor laser driving apparatus includes a substrate, a laser driver, and a semiconductor laser. The substrate incorporates the laser driver. The semiconductor laser has at least one light emitting point. The semiconductor laser is mounted on one surface of the substrate in such a manner that an electrode of the light emitting point and a pattern of the substrate are connected to each other via a bump. Connection wiring electrically connects the laser driver and the semiconductor laser to each other with a wiring inductance of 0.5 nanohenries or less. A sealing portion seals a connection terminal portion of the semiconductor laser for the substrate.
    Type: Application
    Filed: July 2, 2020
    Publication date: September 8, 2022
    Applicant: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Motoi KIMURA, Hirohisa YASUKAWA, Nobuaki KAJI, Takashi KOBAYASHI
  • Publication number: 20220285908
    Abstract: To reduce the wiring inductance between a semiconductor laser and a laser driver in a semiconductor laser driving apparatus. A substrate incorporates a laser driver. A semiconductor laser is mounted on one surface of the substrate of a semiconductor laser driving apparatus to emit irradiation light from an irradiation surface. Connection wiring electrically connects the laser driver and the semiconductor laser to each other with a wiring inductance of 0.5 nanohenries or less. A temperature sensor measures a temperature relating to the semiconductor laser. A memory stores control data from the laser driver to the semiconductor laser in a manner corresponding to the temperature.
    Type: Application
    Filed: July 20, 2020
    Publication date: September 8, 2022
    Applicant: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Nobuaki KAJI, Hirohisa YASUKAWA
  • Patent number: 8757808
    Abstract: An aspect of the present embodiment, there is provided a projector, including a first optical source fixed on a first mount substrate, the first optical source emitting a first light, a second optical source fixed on the first mount substrate being apart from the first optical source for a first distance, the second optical source emitting a second light, a third optical source fixed on a second mount substrate, the third optical source emitting a third light, an emission period of the third light being set between an emission period of the first light and an emission period of the second light.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: June 24, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Nobuaki Kaji
  • Publication number: 20120044462
    Abstract: An aspect of the present embodiment, there is provided a projector, including a first optical source fixed on a first mount substrate, the first optical source emitting a first light, a second optical source fixed on the first mount substrate being apart from the first optical source for a first distance, the second optical source emitting a second light, a third optical source fixed on a second mount substrate, the third optical source emitting a third light, an emission period of the third light being set between an emission period of the first light and an emission period of the second light.
    Type: Application
    Filed: August 19, 2011
    Publication date: February 23, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Nobuaki KAJI
  • Patent number: 8077586
    Abstract: According to one embodiment, an optical recording head device includes a light source which outputs such a relaxation oscillation optical pulse that a full width at half maximum of a single pulse is 820 ps or less, a driving unit for driving the light source, an objective lens which converges emission light from the light source on a recording layer of a recording medium, and captures reflective light which is reflected by the recording layer of the recording medium, a distribution unit, placed between the light source and the objective lens, for distributing incident light, and a photodetection unit for receiving via the distribution unit the reflective light which is reflected by the recording layer of the recording medium, wherein a resonator length of the light source is 6560 ?m or less.
    Type: Grant
    Filed: October 23, 2008
    Date of Patent: December 13, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuo Watabe, Takashi Usui, Keiichiro Yusu, Chosaku Noda, Kazuto Kuroda, Nobuaki Kaji, Masahiro Saito
  • Patent number: 7688874
    Abstract: A semiconductor laser driving device includes a current supply unit supplying current to a semiconductor laser; a first control unit controlling the current supply unit to supply a first current which is half or less of a lasing threshold of the semiconductor laser; and a second control unit controlling the current supply unit to supply a second current which is larger than the lasing threshold after a first time is passed from an edge of a clock signal.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: March 30, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Nobuaki Kaji, Kazuo Watabe
  • Patent number: 7668064
    Abstract: According to one embodiment, an optical pickup unit which can record, reproduction and erase information in/from an information recording medium has tracks with different pitches, the dividing means has at least a part of a dividing boundary line placing between an end of a 1st order diffraction light with the largest diffraction angle and an end of a 1st order diffraction light with the smallest diffraction angle of the reflected laser beam.
    Type: Grant
    Filed: January 31, 2006
    Date of Patent: February 23, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Nobuaki Kaji, Sumitaka Maruyama, Akihito Ogawa, Kazuo Watabe
  • Publication number: 20090196148
    Abstract: According to one embodiment, the invention provides a master recording apparatus and method which can form a pit having a symmetrical pit shape with excellent reproducibility. An embodiment of the invention is a master recording apparatus where a resist film on a master for an optical disk is irradiated with irradiation light from a semiconductor laser to record information on the resist film, where the resist film is formed as an inorganic resist film, and means for outputting the irradiation light from the semiconductor laser as a short pulse laser with a pulse width between 200 ps and 1 ns is provided.
    Type: Application
    Filed: January 29, 2009
    Publication date: August 6, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Keiichiro YUSU, Masahiro SAITO, Kazuto KURODA, Takashi USUI, Kazuo WATABE, Chosaku NODA, Nobuaki KAJI, Masaaki MATSUMARU, Ryosuke YAMAMOTO
  • Publication number: 20090196142
    Abstract: According to one embodiment, in an information recording medium for which a phase change material is used and in which information is recorded on, reproduced from, and erased from a recording layer by light irradiation, a recrystallization width WR at a periphery of an amorphous recording mark formed on the recording layer by light irradiation, and a recording mark width WA and a track pitch TP satisfy 1.0<WR/WA<1.1 and 2/3<WA/TP<4/3.
    Type: Application
    Filed: January 29, 2009
    Publication date: August 6, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Keiichiro YUSU, Masahiro SAITO, Kazuto KURODA, Takashi USUI, Kazuo WATABE, Chosaku NODA, Nobuaki KAJI, Tsukasa NAKAI
  • Publication number: 20090196138
    Abstract: According to one embodiment, in one embodiment of the invention, a laser drive circuit is provided with a first current source, a second drive current source, and a third current source. The control section selectively obtains a plurality of laser light use mode of controlling the from first to third current sources to use pulse laser light accompanying relaxation oscillation, and a complex laser light use mode of using laser light where laser pulses are combined, whose starting end has an abrupt impulse change portion caused by relaxation oscillation and whose intermediate section is a flat portion with a fixed intensity.
    Type: Application
    Filed: January 9, 2009
    Publication date: August 6, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Nobuaki Kaji, Kazuo Watabe, Takashi Usui, Keiichiro Yusu, Chosaku Noda, Kazuto Kuroda, Masahiro Saito
  • Publication number: 20090141760
    Abstract: According to one embodiment, a drive control apparatus of a semiconductor laser includes a driving circuit which drives the semiconductor laser by applying pulses transiting from bias current to peak current to the semiconductor laser as laser driving current that causes relaxation oscillation of emission light intensity of the semiconductor laser, and a control circuit which controls the bias current such that the bias current has a predetermined ratio limiting fluctuation of a leading peak value of the relaxation oscillation occurring for each application of pulses relative to threshold current of the semiconductor laser. The control circuit changes the bias current to maintain the predetermined ratio relative to fluctuation of the threshold current.
    Type: Application
    Filed: October 29, 2008
    Publication date: June 4, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masahiro Saito, Takashi Usui, Kazuo Watabe, Keiichiro Yusu, Chosaku Noda, Nobuaki Kaji, Kazuto Kuroda
  • Publication number: 20090141615
    Abstract: According to one embodiment, an optical recording medium according to one embodiment of the invention is an optical recording medium to be processed using a light beam having a wavelength ? and a lens having a numerical aperture NA, which includes one of a track and a pit array, and in which a width TP of the track or pit satisfies a condition 0.480?TP×NA/?<1.026.
    Type: Application
    Filed: October 2, 2008
    Publication date: June 4, 2009
    Inventors: Tsukasa NAKAI, Yasuhiro Satoh, Nobuaki Kaji, Sumio Ashida
  • Publication number: 20090109815
    Abstract: According to one embodiment, an optical disc device includes a light source portion which applies laser light to an optical disc, a drive portion which supplies a drive current to the light source portion so as to cause the light source portion to apply laser light of light pulses having relaxation oscillation, and a controller which controls the drive portion to supply a drive current so as to cause the light source portion to emit laser light of (n?1)×N (N is an integral number) light pulses having relaxation oscillation with respect to a mark with recording mark length nT (n: integral number, T: channel clock) to be recorded on the optical disc.
    Type: Application
    Filed: October 29, 2008
    Publication date: April 30, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Takashi Usui, Kazuo Watabe, Keiichiro Yusu, Chosaku Noda, Kazuto Kuroda, Nobuaki Kaji, Masahiro Saito
  • Publication number: 20090109809
    Abstract: According to one embodiment, a laser drive circuit includes a photodetector which receives part of laser light emitted from a laser element to a recording medium independently of reflection laser light reflected by the recording medium, and outputs an output corresponding to the strength thereof, an integration circuit which integrates the output from the photodetector for a predetermined time, and a setting circuit which sets the intensity of a laser drive current supplied to the laser element on the basis of the output from the integration circuit.
    Type: Application
    Filed: October 24, 2008
    Publication date: April 30, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kazuto Kuroda, Kazuo Watabe, Keiichiro Yusu, Chosaku Noda, Nobuaki Kaji, Takashi Usui, Masahiro Saito
  • Publication number: 20090109816
    Abstract: According to one embodiment, a calibration section controls an LD driving section so as to carry out test writing on a recording layer of an optical disc using a light pulse having relaxation oscillation, irradiates the test-written area with a reproduction laser beam so as to detect reflected light, and determine write strategy based on the detected result. A recording process is executed on the optical disc by using the light pulse having relaxation oscillation based on the write strategy determined by the calibration section.
    Type: Application
    Filed: October 22, 2008
    Publication date: April 30, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Takashi Usui, Kazuo Watabe, Keiichiro Yusu, Chosaku Noda, Kazuto Kuroda, Nobuaki Kaji, Masahiro Saito
  • Publication number: 20090109808
    Abstract: According to one embodiment, a laser drive circuit which supplies a drive current to a laser element which outputs light at a predetermined wavelength, and a laser control circuit which supplies a predetermined timing pulse for generation of relaxation oscillation in a laser drive current supplied to the laser drive circuit, the laser control circuit supplying a laser drive current higher than a threshold value which is supplied from the laser drive circuit to the laser element to enable laser light to be output from the laser element, the laser control circuit setting the laser drive current to a level lower than the threshold value on the basis of the timing pulse.
    Type: Application
    Filed: September 11, 2008
    Publication date: April 30, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Nobuaki Kaji, Kazuo Watabe, Takashi Usui, Keiichiro Yasu, Chosaku Noda, Kazuto Kuroda, Masahiro Saito