Patents by Inventor Mitsushi TABATA

Mitsushi TABATA 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: 20240146290
    Abstract: A light source drive circuit according to an embodiment includes: a first delay circuit (10) that gives, based on a clock signal, a delay to an input signal with first time resolution and a second delay circuit (20) that is connected in series to the first delay circuit, gives, based on the clock signal, a delay to an input signal with a second time resolution having accuracy different from accuracy of the first time resolution, and outputs the signal as a signal for driving a light source.
    Type: Application
    Filed: March 2, 2022
    Publication date: May 2, 2024
    Inventors: TAKASHI MASUDA, DAISUKE SUZUKI, MITSUSHI TABATA, KOICHI OKAMOTO, KOUTA HIYAMA
  • Publication number: 20240128282
    Abstract: A semiconductor device (10) according to one aspect of the present disclosure includes: a driving section (40) that drives an object to be driven; an abnormality detecting circuit (30), which is one example of an instruction circuit that outputs an instruction signal to the driving section (40); and a light amount detecting section (20) that detects an amount of incident light and invalidates the instruction signal output from the abnormality detecting circuit (30) in accordance with the amount of incident light.
    Type: Application
    Filed: February 16, 2022
    Publication date: April 18, 2024
    Inventors: Koichi Okamoto, Hideaki Mogi, Takashi Masuda, Shinichirou Saeki, Mitsushi Tabata
  • Patent number: 11962124
    Abstract: A detection circuit (20) according to the present disclosure includes a multiple-input one-output operational amplifier (30). The operational amplifier (30) includes a first transistor group (31) and a second transistor (32). The first transistor group (31) includes plural transistors connected in parallel such that operating voltages for plural light emitting elements (5) are inputted individually to gates of the plural transistors, the gates being non-negated input terminals of the operational amplifier. The second transistor (32) cooperates with the first transistor group (31) to form a differential configuration and has a gate which is a negated input terminal of the operational amplifier and to which an output from an output terminal is negatively fed back.
    Type: Grant
    Filed: October 18, 2019
    Date of Patent: April 16, 2024
    Assignee: Sony Semiconductor Solutions Corporation
    Inventors: Takeshi Yuwaki, Mitsushi Tabata
  • Publication number: 20240072781
    Abstract: A delay adjustment circuit according to an embodiment includes: a plurality of delay adjustment units connected in series, each of the plurality of delay adjustment units including one or more first delay elements (102) connected in series that delay an input signal on the basis of a clock, and a first selector (120) that outputs one of the input signal and an output of the first delay element at a last stage among the one or more first delay elements; and an output unit (103, 104, 130a, 130b, 140) that outputs a clock according to an output of the first selector included in a delay adjustment unit at a last stage among the plurality of delay adjustment units, in which each of the plurality of delay adjustment units includes a different number of the first delay elements.
    Type: Application
    Filed: March 2, 2022
    Publication date: February 29, 2024
    Inventors: MITSUSHI TABATA, TAKASHI MASUDA, DAISUKE SUZUKI
  • Patent number: 11672059
    Abstract: A light source device that includes a first resistor that is connected to a given potential, a light emitting element that is connected in series to the first resistor, a second resistor that is connected to the given potential, and a first current source that is connected in series to the second resistor and that is configured to supply a freely-selected current within a given range are included. A first voltage is taken out from a first connection part where the first resistor and the light emitting element are connected to each other and a second voltage is taken out from a second connection part where the second resistor and the first current source are connected to each other.
    Type: Grant
    Filed: January 16, 2020
    Date of Patent: June 6, 2023
    Assignee: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
    Inventors: Takashi Masuda, Mitsushi Tabata, Koichi Okamoto, Yasuo Oba
  • Publication number: 20220291342
    Abstract: Proposed is a ranging system capable of improving the accuracy of ranging. A ranging system (70) includes: a drive unit (24) that causes a light emitting element to emit light and outputs a drive signal for irradiating a target with light; a sensor unit (302) that detects reflected light from the target; a measurement unit (23) that measures a delay time that is included in a time from timing at which a trigger signal for causing the light emitting element to emit light is output to timing at which the light emitting element actually emits light; and a ranging observation unit (52) which is a processing unit that performs a process of calculating a distance to the target on the basis of output timing of the trigger signal, light receiving timing of the reflected light obtained by the sensor unit, and the delay time.
    Type: Application
    Filed: August 27, 2020
    Publication date: September 15, 2022
    Inventors: Daisuke Suzuki, Takashi Masuda, Mitsushi Tabata, Kouta Hiyama, Koichi Okamoto, Akihiko Miyanohara
  • Publication number: 20220276381
    Abstract: The laser drive device (41) includes: a drive circuit (43) that drives a light emitting element (40) by a vertical cavity surface emitting laser to emit light on the basis of a drive control signal; an assist circuit (42) that short-circuits both ends of the light emitting element on the basis of an assist control signal to speed up a fall time of the light emitting element; a timing adjustment unit (20) that performs mutual timing adjustment between the drive control signal and the assist control signal on the basis of a timing adjustment signal; a phase detection unit (33) that detects a phase difference between the drive control signal and the assist control signal; and a timing control unit (34) that generates the timing adjustment signal on the basis of a phase difference detection result of the phase detection unit.
    Type: Application
    Filed: June 12, 2020
    Publication date: September 1, 2022
    Inventors: TAKASHI MASUDA, MITSUSHI TABATA, KOICHI OKAMOTO
  • Publication number: 20220271502
    Abstract: By eliminating the need to use a high-precision clock in pulse width detection for pulse width adjustment in a case where light-emitting elements as vertical-cavity surface-emitting lasers are pulse-driven, circuit configuration is simplified and cost is reduced. A laser drive apparatus according to the present technology includes a drive circuit unit that drives light-emitting elements as vertical-cavity surface-emitting lasers to emit light on the basis of a pulse signal, a pulse width detection unit that detects the pulse width of the pulse signal on the basis of the potential of a capacitor when the capacitor is charged on the basis of the pulse signal, and a control unit that performs control so that the pulse width is adjusted on the basis of a detection result of the pulse width.
    Type: Application
    Filed: May 24, 2020
    Publication date: August 25, 2022
    Inventors: TAKASHI MASUDA, MITSUSHI TABATA, KOICHI OKAMOTO
  • Publication number: 20220104322
    Abstract: A light source device according to an embodiment includes: a first resistor (101) that is connected to a given potential; a light emitting element (12) that is connected in series to the first resistor; a second resistor (102) that is connected to the given potential; and a first current source (104) that is connected in series to the second resistor and that is configured to supply a freely-selected current within a given range are included. A first voltage is taken out from a first connection part where the first resistor and the light emitting element are connected to each other and a second voltage is taken out from a second connection part where the second resistor and the first current source are connected to each other.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 31, 2022
    Inventors: TAKASHI MASUDA, MITSUSHI TABATA, KOICHI OKAMOTO, YASUO OBA
  • Publication number: 20220094139
    Abstract: A light source device according to an embodiment includes: a first resistor (101) that is connected to a given potential; a light emitting element (12) that is connected in series to the first resistor and that is configured to be supplied with a given current and thus emit a given amount of light; a second resistor (102) that is connected to the given potential; and a first current source (104) that is connected in series to the second resistor and that is configured to supply a current obtained by adding a current corresponding to an overcurrent to the given current are included, and a first voltage at a first connection part where the first resistor and the light emitting element are connected to each other and a second voltage at a second connection part where the second resistor and the first current source are connected to each other are taken out.
    Type: Application
    Filed: January 16, 2020
    Publication date: March 24, 2022
    Inventors: TAKASHI MASUDA, MITSUSHI TABATA, KOICHI OKAMOTO, YASUO OBA
  • Publication number: 20220006259
    Abstract: A detection circuit (20) according to the present disclosure includes a multiple-input one-output operational amplifier (30). The operational amplifier (30) includes a first transistor group (31) and a second transistor (32). The first transistor group (31) includes plural transistors connected in parallel such that operating voltages for plural light emitting elements (5) are inputted individually to gates of the plural transistors, the gates being non-negated input terminals of the operational amplifier. The second transistor (32) cooperates with the first transistor group (31) to form a differential configuration and has a gate which is a negated input terminal of the operational amplifier and to which an output from an output terminal is negatively fed back.
    Type: Application
    Filed: October 18, 2019
    Publication date: January 6, 2022
    Inventors: Takeshi Yuwaki, Mitsushi Tabata
  • Publication number: 20220006258
    Abstract: A drive device according to the present disclosure includes a drive circuit (10) and a detection circuit (20). The drive circuit (10) drives a plurality of channels on an individual basis. The plurality of channels includes a plurality of light emitting elements (5). The detection circuit (20) collectively detects abnormalities of all the channels. Further, the drive device (10) is electrically and mechanically connected, with a plurality of microbumps (4), to a light emitting element array that includes the plurality of light emitting elements (5).
    Type: Application
    Filed: October 18, 2019
    Publication date: January 6, 2022
    Inventors: Takeshi Yuwaki, Mitsushi Tabata
  • Publication number: 20210349188
    Abstract: A suppression of a rise in temperature is to be attained for a light source apparatus provided with an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed. A light source apparatus according to the present technology includes an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed, and a driving section configured to cause the plurality of light-emitting elements of the emission section to emit light, in which at least a portion of a region including driving elements in the driving section is disposed so as not to overlap with the emission section.
    Type: Application
    Filed: August 5, 2019
    Publication date: November 11, 2021
    Inventors: MITSUSHI TABATA, TAKASHI MASUDA, TAKESHI YUWAKI, YASUO OBA
  • Publication number: 20210325513
    Abstract: Attaining a more compact apparatus while also enabling the voltage to be detected for each light-emitting element in a light source apparatus provided with an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed. A light source apparatus according to the present technology includes an emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed, and a detection section configured to detect a voltage at an anode or a cathode of the plurality of light-emitting elements in the emission section individually by time division. With this arrangement, it is not necessary to provide a circuit for detecting voltage with respect to each light-emitting element, and it becomes possible to attain a more compact apparatus.
    Type: Application
    Filed: July 12, 2019
    Publication date: October 21, 2021
    Inventors: MITSUSHI TABATA, TAKASHI MASUDA
  • Publication number: 20210313777
    Abstract: A light source device including a light emitting unit in which multiple light emitting elements including vertical cavity surface emitting lasers are arranged is intended to curb temperature rise. A light source device according to the present technology includes a light emitting unit in which multiple light emitting elements including vertical cavity surface emitting lasers are arranged, and a driving unit that, regarding the light emitting element in the light emitting unit, causes multiple light emitting elements to be caused to emit light in a light emission target period to emit light in a time-divided manner in the light emission target period. By adopting time-division light emission, the number of light emitting elements that are caused to emit light simultaneously is reduced.
    Type: Application
    Filed: June 14, 2019
    Publication date: October 7, 2021
    Inventors: MITSUSHI TABATA, TAKASHI MASUDA
  • Publication number: 20210273404
    Abstract: A laser drive circuit is provided which includes: a first drive current unit (240) configured to adjust, by a first MOSFET (MN2) and a second MOSFET (MN3) being connected in series, an inflow of a current to a light-emitting element (LD11) that emits light in accordance with a current amount when the light-emitting element emits light and when the light-emitting element is extinguished; a voltage drop unit (MN4) configured to cause a gate-source voltage of the first MOSFET to drop when the light-emitting element is extinguished; and a timing generating unit (220) configured to generate a signal for controlling driving of the first drive current unit and the voltage drop unit.
    Type: Application
    Filed: June 17, 2019
    Publication date: September 2, 2021
    Inventors: MITSUSHI TABATA, TAKASHI MASUDA, TAKESHI YUWAKI, TOSHIYUKI KITAZAWA
  • Publication number: 20210167572
    Abstract: A light source apparatus is provided with the emission section in which a plurality of vertical-cavity surface-emitting laser light-emitting elements is arrayed, the driving circuit section that causes the plurality of light-emitting elements of the emission section to emit light, the temperature detection section that includes a plurality of temperature sensors arranged to detect the temperature of the emission section, and a control section. The control section is configured to, during an emission target period when the light-emitting elements of the emission section are driven by the driving circuit section, correct a detection value from each of the plurality of temperature sensors by using a correction value set for each of the temperature sensors.
    Type: Application
    Filed: July 10, 2019
    Publication date: June 3, 2021
    Inventors: MITSUSHI TABATA, TAKASHI MASUDA, TAKESHI YUWAKI
  • Patent number: 8415998
    Abstract: A PLL circuit, has a phase comparator for comparing phases of a reference clock and a feedback clock, and outputting a phase comparison signal indicating the phase difference; a charge pump circuit, which, during a time period corresponding to the phase difference, outputs a first charge pump current and a second charge pump current; a loop filter, having a capacitor storing electric charge based on the first and second charge pump currents, which generates a control voltage due to stored electric charge; an oscillator generating an output clock at a frequency according to the control voltage; a frequency divider frequency-dividing the output clock and outputs the feedback clock; and a charge pump adjustment circuit, which, when in a locked state, adjusts current quantity of the first or the second charge pump current such that the phase difference is suppressed, according to the phase difference indicated by the phase comparison signal.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: April 9, 2013
    Assignee: Fujitsu Semiconductor Limited
    Inventor: Mitsushi Tabata
  • Publication number: 20120154000
    Abstract: A PLL circuit, has a phase comparator for comparing phases of a reference clock and a feedback clock, and outputting a phase comparison signal indicating the phase difference; a charge pump circuit, which, during a time period corresponding to the phase difference, outputs a first charge pump current and a second charge pump current; a loop filter, having a capacitor storing electric charge based on the first and second charge pump currents, which generates a control voltage due to stored electric charge; an oscillator generating an output clock at a frequency according to the control voltage; a frequency divider frequency-dividing the output clock and outputs the feedback clock; and a charge pump adjustment circuit, which, when in a locked state, adjusts current quantity of the first or the second charge pump current such that the phase difference is suppressed, according to the phase difference indicated by the phase comparison signal.
    Type: Application
    Filed: September 23, 2011
    Publication date: June 21, 2012
    Applicant: FUJITSU SEMICONDUCTOR LIMITED
    Inventor: Mitsushi TABATA