Patents by Inventor Tadahiko Kobayakawa
Tadahiko Kobayakawa 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).
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Publication number: 20240106012Abstract: A battery pack in one aspect of the present disclosure includes a battery and a controller provided with a counter value. During discharge of the battery pack, the controller calculates an addition value in accordance with a total number of use of the battery pack under a specified condition. The controller updates the counter value by adding the addition value. The controller prohibits the discharge of the battery pack in response to the counter value reaching a protection threshold.Type: ApplicationFiled: December 5, 2023Publication date: March 28, 2024Applicant: MAKITA CORPORATIONInventors: Tadahiko KOBAYAKAWA, Hiroki UESUGI, Hayato KANO
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Patent number: 11925307Abstract: A rechargeable cleaner includes a body, a rechargeable battery, a charger, and a body controller. The body is configured to generate suction power capable of sucking dust together with air using a motor. The rechargeable battery is configured to supply electric power to the motor. The charger is configured to charge the battery. The body controller is disposed in the body. The body controller controls at least one of a charging current and a charging voltage based on cell voltage information indicating a cell voltage, cell temperature information indicating a cell temperature, and battery identification information for identifying the battery that are acquired from the battery, and based on charger identification information for identifying the charger acquired from the charger.Type: GrantFiled: May 23, 2019Date of Patent: March 12, 2024Assignee: MAKITA CORPORATIONInventors: Ryuji Mitsui, Tadahiko Kobayakawa, Takuya Umemura, Toru Yamada, Mamoru Sakai
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Patent number: 11876190Abstract: A battery pack in one aspect of the present disclosure includes a battery and a controller provided with a counter value. During discharge of the battery pack, the controller calculates an addition value in accordance with a total number of use of the battery pack under a specified condition. The controller updates the counter value by adding the addition value. The controller prohibits the discharge of the battery pack in response to the counter value reaching a protection threshold.Type: GrantFiled: September 16, 2020Date of Patent: January 16, 2024Assignee: MAKITA CORPORATIONInventors: Tadahiko Kobayakawa, Hiroki Uesugi, Hayato Kano
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Publication number: 20230318314Abstract: A system in one aspect of the present disclosure includes a battery pack and an electric work machine. The battery pack includes a battery, a first interface, a first memory and a first controller. The first controller is configured to transmit battery data identifying a type of the battery pack. The electric work machine includes a motor, a second interface, a switching element, a manual switch, a second memory and a second controller. The second controller is configured to transmit electric apparatus data identifying a type of the electric work machine.Type: ApplicationFiled: March 27, 2023Publication date: October 5, 2023Applicant: MAKITA CORPORATIONInventors: Tadahiko KOBAYAKAWA, Hayato KANO, Yoshitaka ICHIKAWA
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Publication number: 20220115892Abstract: An electric work machine (1), such as a power tool, comprises a motor (50), a manipulatable part (12) such as a trigger switch, and a control part (36). The motor is energized with electric current supplied by a battery pack (22). By manipulating the manipulatable part, the control part energizes the motor. The control part also acquires information concerning the state of the battery from the battery pack, and, if appropriate based on the information obtained from the battery pack, takes measures (such as limiting a discharge current) to restrain, delay and possibly avert the performance of a protection (discharge-prohibited) operation by the battery pack.Type: ApplicationFiled: September 11, 2019Publication date: April 14, 2022Inventors: Yoshitaka ICHIKAWA, Tadahiko KOBAYAKAWA
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Publication number: 20210274990Abstract: A rechargeable cleaner includes a body, a rechargeable battery, and a charger. The body is configured to generate suction power capable of sucking dust together with air using a motor. The rechargeable battery is configured to supply electric power to the motor. The charger is configured to charge the battery at a charging rate of 3 C or higher and lower than 10 C.Type: ApplicationFiled: May 23, 2019Publication date: September 9, 2021Applicant: MAKITA CORPORATIONInventors: Ryuji MITSUI, Tadahiko KOBAYAKAWA, Takuya UMEMURA, Toru YAMADA, Mamoru SAKAI
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Publication number: 20210228040Abstract: A rechargeable cleaner includes a body, a rechargeable battery, a charger, and a body controller. The body is configured to generate suction power capable of sucking dust together with air using a motor. The rechargeable battery is configured to supply electric power to the motor. The charger is configured to charge the battery. The body controller is disposed in the body. The body controller controls at least one of a charging current and a charging voltage based on cell voltage information indicating a cell voltage, cell temperature information indicating a cell temperature, and battery identification information for identifying the battery that are acquired from the battery, and based on charger identification information for identifying the charger acquired from the charger.Type: ApplicationFiled: May 23, 2019Publication date: July 29, 2021Applicant: MAKITA CORPORATIONInventors: Ryuji MITSUI, Tadahiko KOBAYAKAWA, Takuya UMEMURA, Toru YAMADA, Mamoru SAKAI
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Publication number: 20210098832Abstract: A battery pack in one aspect of the present disclosure includes a battery and a controller provided with a counter value. During discharge of the battery pack, the controller calculates an addition value in accordance with a total number of use of the battery pack under a specified condition. The controller updates the counter value by adding the addition value. The controller prohibits the discharge of the battery pack in response to the counter value reaching a protection threshold.Type: ApplicationFiled: September 16, 2020Publication date: April 1, 2021Applicant: MAKITA CORPORATIONInventors: Tadahiko KOBAYAKAWA, Hiroki UESUGI, Hayato KANO
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Patent number: 10855089Abstract: A charging control device includes a detector detecting a temperature of a battery; a controller causing the charger to stop charging the battery in response to the temperature of the battery falling outside a first range during the charging of the battery; an obtainer obtaining, from the charger, information that is capable of identifying a charging characteristic of the charger; a range setter setting the first range to be a temperature range that corresponds to the charging characteristic of the charger based on the information obtained in the obtainer.Type: GrantFiled: October 16, 2018Date of Patent: December 1, 2020Assignee: MAKITA CORPORATIONInventors: Tadahiko Kobayakawa, Junichi Katayama
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Patent number: 10418826Abstract: A battery device having a chargeable and dischargeable battery; a detection unit that detects a state of the battery; and a control unit. The control unit calculates a value of a maximum charging current that can be supplied to the battery during charging of the battery on the basis of the state of the battery detected by the detection unit, and notifies a result of such calculation to a charging device.Type: GrantFiled: November 25, 2016Date of Patent: September 17, 2019Assignee: MAKITA CORPORATIONInventors: Junichi Katayama, Masafumi Noda, Tadahiko Kobayakawa
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Publication number: 20190123569Abstract: A charging control device includes a detector detecting a temperature of a battery; a controller causing the charger to stop charging the battery in response to the temperature of the battery falling outside a first range during the charging of the battery; an obtainer obtaining, from the charger, information that is capable of identifying a charging characteristic of the charger; a range setter setting the first range to be a temperature range that corresponds to the charging characteristic of the charger based on the information obtained in the obtainer.Type: ApplicationFiled: October 16, 2018Publication date: April 25, 2019Applicant: MAKITA CORPORATIONInventors: Tadahiko KOBAYAKAWA, Junichi KATAYAMA
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Patent number: 10222424Abstract: A charge control device of one example of the present invention comprises a temperature detection unit, a storage unit, and an upper limit setting unit. The storage unit stores a reference current characteristic and at least one of a first current characteristic and a second current characteristic as a charging current characteristic, and stores a reference voltage characteristic and at least one of a first voltage characteristic and a second voltage characteristic as a charging voltage characteristic. The upper limit setting unit selects a characteristic used to set upper limits of a charging current and a charging voltage to the battery from among a plurality of the charging current characteristics and a plurality of the charging voltage characteristics stored in the storage unit.Type: GrantFiled: September 12, 2017Date of Patent: March 5, 2019Assignee: MAKITA CORPORATIONInventors: Takuya Umemura, Tadahiko Kobayakawa, Hitoshi Suzuki
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Publication number: 20180003773Abstract: A charge control device of one example of the present invention comprises a temperature detection unit, a storage unit, and an upper limit setting unit. The storage unit stores a reference current characteristic and at least one of a first current characteristic and a second current characteristic as a charging current characteristic, and stores a reference voltage characteristic and at least one of a first voltage characteristic and a second voltage characteristic as a charging voltage characteristic. The upper limit setting unit selects a characteristic used to set upper limits of a charging current and a charging voltage to the battery from among a plurality of the charging current characteristics and a plurality of the charging voltage characteristics stored in the storage unit.Type: ApplicationFiled: September 12, 2017Publication date: January 4, 2018Applicant: MAKITA CORPORATIONInventors: Takuya UMEMURA, Tadahiko KOBAYAKAWA, Hitoshi SUZUKI
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Patent number: 9784795Abstract: A charge control device of one example of the present invention comprises a temperature detection unit, a storage unit, and an upper limit setting unit. The storage unit stores a reference current characteristic and at least one of a first current characteristic and a second current characteristic as a charging current characteristic, and stores a reference voltage characteristic and at least one of a first voltage characteristic and a second voltage characteristic as a charging voltage characteristic. The upper limit setting unit selects a characteristic used to set upper limits of a charging current and a charging voltage to the battery from among a plurality of the charging current characteristics and a plurality of the charging voltage characteristics stored in the storage unit.Type: GrantFiled: June 17, 2015Date of Patent: October 10, 2017Assignee: MAKITA CORPORATIONInventors: Takuya Umemura, Tadahiko Kobayakawa, Hitoshi Suzuki
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Patent number: 9778321Abstract: A charge control device includes a voltage detector that detects a voltage of a battery, a temperature detector that detects a battery temperature, a voltage setting unit that sets at least one of a charge completion voltage and an abnormality determination voltage to a high temperature time voltage that is lower than a normal voltage when the battery temperature detected by the temperature detector is or is above a high temperature determination threshold set in advance, and a charging current limiting unit that reduces a charging current a charger supplies to the battery when the battery temperature is in a temperature range between a set temperature that is lower by a predetermined temperature than the high temperature determination threshold and the high temperature determination threshold and the battery voltage detected by the voltage detector is in a voltage range between the normal voltage and the high temperature time voltage.Type: GrantFiled: December 1, 2014Date of Patent: October 3, 2017Assignee: MAKITA CORPORATIONInventors: Takuya Umemura, Tadahiko Kobayakawa, Hiroki Uesugi, Hiroshi Hanai
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Publication number: 20170155254Abstract: A battery device of one aspect of the present disclosure comprises a chargeable and dischargeable battery; a detection unit that detects a state of the battery; and a control unit. The control unit calculates a value of a maximum charging current that can be supplied to the battery during charging of the battery on the basis of the state of the battery detected by the detection unit, and notifies a result of such calculation to a charging device.Type: ApplicationFiled: November 25, 2016Publication date: June 1, 2017Applicant: MAKITA CORPORATIONInventors: Junichi KATAYAMA, Masafumi NODA, Tadahiko KOBAYAKAWA
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Patent number: 9356464Abstract: A battery pack includes: a connecting portion connected to a battery charger; a battery chargeable by the battery charger connected to the connecting portion; an environment temperature detecting element detecting an environment temperature around the battery; and a control circuit. The control circuit periodically detects the environment temperature via the environment temperature detecting element and controls the battery charger to suspend starting of charging the battery or to temporarily discontinue charging the battery when a variation of the environment temperature detected exceeds a predetermined range, when the battery charger is connected to the connecting portion.Type: GrantFiled: February 27, 2014Date of Patent: May 31, 2016Assignee: MAKITA CORPORATIONInventors: Miki Tomiyasu, Tadahiko Kobayakawa, Hiroshi Hanai
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Patent number: 9341681Abstract: An electrical device system having a battery pack, an electrical device, and a charging device, includes: a current detecting unit that detects a battery current flowing through the battery during a charge to or a discharge from the battery; a battery state detecting unit that detects at least one of a battery voltage and a temperature of a heat generating unit; and a determining unit that estimates an amount of change in at least one of the battery voltage and the temperature of the heat generating unit, based on the battery current, and calculates an amount of actual change in at least one of the battery voltage and the temperature of the heat generating unit, wherein the determining unit determines that the current detecting unit is abnormal, when the difference between the calculated amount of actual change and the estimated amount of change is a default value or more.Type: GrantFiled: March 28, 2014Date of Patent: May 17, 2016Assignee: MAKITA CORPORATIONInventors: Tadahiko Kobayakawa, Hitoshi Suzuki, Masaaki Fukumoto
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Publication number: 20150372512Abstract: A charge control device of one example of the present invention comprises a temperature detection unit, a storage unit, and an upper limit setting unit. The storage unit stores a reference current characteristic and at least one of a first current characteristic and a second current characteristic as a charging current characteristic, and stores a reference voltage characteristic and at least one of a first voltage characteristic and a second voltage characteristic as a charging voltage characteristic. The upper limit setting unit selects a characteristic used to set upper limits of a charging current and a charging voltage to the battery from among a plurality of the charging current characteristics and a plurality of the charging voltage characteristics stored in the storage unit.Type: ApplicationFiled: June 17, 2015Publication date: December 24, 2015Applicant: MAKITA CORPORATIONInventors: Takuya UMEMURA, Tadahiko KOBAYAKAWA, Hitoshi SUZUKI
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Patent number: 9186787Abstract: An internal temperature estimation unit, which reads a detected temperature of a cell of a battery for an electric power tool to estimate an internal temperature of the battery based on the detected temperature, includes: an initial-value setting device which reads, when a discharge/charge of the battery is started, the detected temperature and sets the detected temperature as an initial value; and a temperature increase amount calculation device which calculates a temperature increase amount of the cell of the battery based on a latest value of the detected temperature and the initial value set by the initial-value setting device; the internal temperature estimation unit outputs the temperature increase amount as an estimated value representing the internal temperature of the battery.Type: GrantFiled: February 3, 2011Date of Patent: November 17, 2015Assignee: MAKITA CORPORATIONInventors: Masafumi Noda, Hisakazu Okabayashi, Tadahiko Kobayakawa