Patents by Inventor Atsumasa Kubota
Atsumasa Kubota 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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Patent number: 8643339Abstract: A battery pack includes a status detection unit for detecting a status of a battery; a switch unit for interrupting a discharging path of the battery; a notification unit for notifying a user of the status of the battery; an operation unit operable by the user; and control unit for opening and closing the switch unit. The control unit is configured to have the switch unit interrupt the discharging path of the battery when the status of the battery detected by the status detection unit is abnormal. Further, the control unit is configured to have the notification unit notify the user of the availability to restart a discharging operation and close the switch unit in response to an operation signal inputted from the operation unit to make the battery pack dischargeable when the status of the battery detected by the status detection unit is recovered from the abnormal status.Type: GrantFiled: March 19, 2009Date of Patent: February 4, 2014Assignee: Panasonic CorporationInventors: Norihiro Iwamura, Motoharu Muto, Masaki Ikeda, Naoki Shimizu, Atsumasa Kubota, Masaaki Okada, Tatsuya Miwa
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Patent number: 8633824Abstract: A charger for an electric power tool includes a charging unit for charging a secondary battery detachably attached to the charger; a notification unit for notifying an operation state of the charging unit by using a combination of a turn-on and turn-off of the notification unit; a brightness reducing unit for reducing a light brightness of the notification unit; and a controller for controlling the notification unit and the brightness reducing unit. If an operation state of the charging unit satisfies a specific condition, the controller controls the brightness reducing unit to reduce the light brightness of the notification unit.Type: GrantFiled: March 24, 2010Date of Patent: January 21, 2014Assignee: Panasonic CorporationInventors: Tatsuya Miwa, Atsumasa Kubota, Norihiro Iwamura, Masaaki Okada, Naoki Tsuruta, Masaki Ikeda
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Patent number: 8344675Abstract: A rechargeable electric power tool includes a motor driven by a secondary battery, a switching element for regulating power distribution to the motor, a motor control unit for controlling rotation of the motor through the switching element, a lead wire for supplying a drive current to the motor therethrough and a trigger switch changed over by a user for turning on or off the drive current supplied to the motor through the lead wire. In the rechargeable electric power tool, upon changeover of the trigger switch, a microcomputer determines a magnitude relation between a detected temperature outputted from a first thermistor and a first temperature threshold value. If the detected temperature is determined to be greater than the first temperature threshold value, the microcomputer is set in a limited operation mode in which a revolution number of the motor is limited to a predetermined value or less.Type: GrantFiled: November 10, 2009Date of Patent: January 1, 2013Assignee: Panasonic Electric Works Power Tools Co., LtdInventors: Tatsuya Miwa, Atsumasa Kubota, Masaki Ikeda, Kazuhiko Nishii
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Patent number: 8084981Abstract: In a rechargeable electric power tool, upon changeover of a trigger switch, a microcomputer determines the magnitude relation between the detected temperature outputted from the first thermistor and the first temperature threshold value, the second temperature threshold value and the third temperature threshold value, and the magnitude relation between the first calculated temperature increase rate and the first preset temperature increase rate. If the detected temperature is determined to be greater than the first temperature threshold value or if the first calculated temperature increase rate is determined to be greater than the first preset temperature increase rate after the detected temperature has been determined to be greater than the second temperature threshold value, the microcomputer is set in a limited operation mode in which the revolution number of the motor is limited to a predetermined value or less.Type: GrantFiled: November 10, 2009Date of Patent: December 27, 2011Assignee: Panasonic Electric Works Power Tools Co., Ltd.Inventors: Tatsuya Miwa, Kazuhiko Nishii, Atsumasa Kubota, Kazuto Toyama, Masaki Ikeda
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Patent number: 7986128Abstract: A battery charger includes an attachment portion capable of being connected to a plurality of battery packs; a connection unit for connecting one of the battery packs connected to the attachment portion to a charging path; a state detection unit for detecting a state of each of the battery packs; a remaining capacity detection unit; and a charging control unit. The remaining capacity detection unit detects a remaining capacity based on the state of the battery pack detected by the state detection unit after each of the battery pack is charged for a specified period of time. Further, the charging control unit assigns priorities to the battery packs such that one whose remaining capacity detected by the remaining capacity detection unit is closer to a fully charged state thereof has a higher priority, and controls the connection unit to charge the battery packs according to the assigned priorities.Type: GrantFiled: November 20, 2007Date of Patent: July 26, 2011Assignee: Panasonic Electric Works Co., Ltd.Inventors: Atsumasa Kubota, Masaki Ikeda, Tatsuya Miwa, Naoki Shimizu, Norihiro Iwamura
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Publication number: 20100245099Abstract: A charger for an electric power tool includes a charging unit for charging a secondary battery detachably attached to the charger; a notification unit for notifying an operation state of the charging unit by using a combination of a turn-on and turn-off of the notification unit; a brightness reducing unit for reducing a light brightness of the notification unit; and a controller for controlling the notification unit and the brightness reducing unit. If an operation state of the charging unit satisfies a specific condition, the controller controls the brightness reducing unit to reduce the light brightness of the notification unit.Type: ApplicationFiled: March 24, 2010Publication date: September 30, 2010Applicant: Panasonic Electric Works Power Tools Co., Ltd.Inventors: Tatsuya Miwa, Atsumasa Kubota, Norihiro Iwamura, Masaaki Okada, Naoki Tsuruta, Masaki Ikeda
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Patent number: 7784104Abstract: A power tool system with enhanced antitheft capability has a hand-held power tool and a wearable piece worn by the user. The wearable piece incorporates a certification unit which stores an identification code specifying the power tool and transmits the identification code to an authenticator incorporated in the power tool. The authenticator reads the identification code from the certification unit and to provide an authentication signal when the identification code is authenticated to be eligible for a privileged use of the power tool. The power tool is enabled only in response to the authentication signal, and otherwise disabled for avoiding unauthorized use. A communication is established between the certification unit and the authenticator for transmission of the identification code, while the user holds the power tool with the wearable piece carried on.Type: GrantFiled: February 9, 2006Date of Patent: August 24, 2010Assignee: Panasonic Electric Works Co., Ltd.Inventors: Teruhisa Innami, Masaki Ikeda, Naotake Tanaka, Atsumasa Kubota, Tatsuya Miwa
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Publication number: 20100117581Abstract: A rechargeable electric power tool includes a motor driven by a secondary battery, a switching element for regulating power distribution to the motor, a motor control unit for controlling rotation of the motor through the switching element, a lead wire for supplying a drive current to the motor therethrough and a trigger switch changed over by a user for turning on or off the drive current supplied to the motor through the lead wire. In the rechargeable electric power tool, upon changeover of the trigger switch, a microcomputer determines a magnitude relation between a detected temperature outputted from a first thermistor and a first temperature threshold value. If the detected temperature is determined to be greater than the first temperature threshold value, the microcomputer is set in a limited operation mode in which a revolution number of the motor is limited to a predetermined value or less.Type: ApplicationFiled: November 10, 2009Publication date: May 13, 2010Applicant: Panasonic Electric Works Power Tools Co., Ltd.Inventors: Tatsuya Miwa, Atsumasa Kubota, Masaki Ikeda, Kazuhiko Nishii
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Publication number: 20100117580Abstract: In a rechargeable electric power tool, upon changeover of a trigger switch, a microcomputer determines the magnitude relation between the detected temperature outputted from the first thermistor and the first temperature threshold value, the second temperature threshold value and the third temperature threshold value, and the magnitude relation between the first calculated temperature increase rate and the first preset temperature increase rate. If the detected temperature is determined to be greater than the first temperature threshold value or if the first calculated temperature increase rate is determined to be greater than the first preset temperature increase rate after the detected temperature has been determined to be greater than the second temperature threshold value, the microcomputer is set in a limited operation mode in which the revolution number of the motor is limited to a predetermined value or less.Type: ApplicationFiled: November 10, 2009Publication date: May 13, 2010Applicant: Panasonic Electric Works Power Tools Co., Ltd.Inventors: Tatsuya Miwa, Kazuhiko Nishii, Atsumasa Kubota, Kazuto Toyama, Masaki Ikeda
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Publication number: 20090243545Abstract: A battery pack includes a status detection unit for detecting a status of a battery; a switch unit for interrupting a discharging path of the battery; a notification unit for notifying a user of the status of the battery; an operation unit operable by the user; and control unit for opening and closing the switch unit. The control unit is configured to have the switch unit interrupt the discharging path of the battery when the status of the battery detected by the status detection unit is abnormal. Further, the control unit is configured to have the notification unit notify the user of the availability to restart a discharging operation and close the switch unit in response to an operation signal inputted from the operation unit to make the battery pack dischargeable when the status of the battery detected by the status detection unit is recovered from the abnormal status.Type: ApplicationFiled: March 19, 2009Publication date: October 1, 2009Applicant: Panasonic Electric Works Co., Ltd.Inventors: Norihiro Iwamura, Motoharu Muto, Masaki Ikeda, Naoki Shimizu, Atsumasa Kubota, Masaaki Okada, Tatsuya Miwa
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Patent number: 7592779Abstract: A charging device includes a charging unit; a detection unit for detecting a temperature and a temperature increasing rate of a rechargeable battery; a controller for controlling the charging unit to supply a charging current to the rechargeable battery; and a compensating unit for setting a value of the first threshold to be greater if the temperature of the rechargeable battery at the time of mounting the rechargeable battery on the charging device is equal to or smaller than a second threshold and smaller if otherwise. The charging unit stops supplying the charging current to the rechargeable battery if the temperature increasing rate is equal to or greater than a first threshold.Type: GrantFiled: March 24, 2006Date of Patent: September 22, 2009Assignee: Matsushita Electric Works, Ltd.Inventors: Tatsuya Miwa, Atsumasa Kubota, Naoki Shimizu, Masaki Ikeda
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Publication number: 20080122400Abstract: A battery charger includes an attachment portion capable of being connected to a plurality of battery packs; a connection unit for connecting one of the battery packs connected to the attachment portion to a charging path; a state detection unit for detecting a state of each of the battery packs; a remaining capacity detection unit; and a charging control unit. The remaining capacity detection unit detects a remaining capacity based on the state of the battery pack detected by the state detection unit after each of the battery pack is charged for a specified period of time. Further, the charging control unit assigns priorities to the battery packs such that one whose remaining capacity detected by the remaining capacity detection unit is closer to a fully charged state thereof has a higher priority, and controls the connection unit to charge the battery packs according to the assigned priorities.Type: ApplicationFiled: November 20, 2007Publication date: May 29, 2008Applicant: Matsushita Electric Works Ltd.Inventors: Atsumasa Kubota, Masaki Ikeda, Tatsuya Miwa, Naoki Shimizu, Norihiro Iwamura
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Patent number: 7208915Abstract: A constant-current battery charger includes a power supply for supplying a charge current to a secondary cell, and a current monitor for monitoring a charge current being supplied to the cell. A controller is included for varying the charge current in accordance with the monitored charge current. The controller calculates a current difference between a predetermined target current and the instant charge current, and generates a demand of varying the charge current at a first charge rate when the current difference is out of a predetermined range, and varying the charge current at a second charge rate when the current difference is within the predetermined range. The controller generates the demand repeatedly at regular or varying intervals for varying the charge current. The first charge rate is set to be higher than the second charge rate in order to make a rapid charging until it comes close to the target current.Type: GrantFiled: September 29, 2005Date of Patent: April 24, 2007Assignee: Matsushita Electric Works, Ltd.Inventors: Atsumasa Kubota, Tatsuya Miwa, Masaki Ikeda, Naoki Shimizu
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Patent number: 7161326Abstract: The battery pack used for the battery powered electrical device of the present invention comprises a case for accommodating at least two battery modules, a switching means provided on a side of the case, and an output terminal formed on the case. The switching means selectively closes and opens a series electrical connection of the at least two battery modules. The switching means cooperates with an actuator, which is provided on a side of a device's main body holding the battery pack detachably, to establish the series electrical connection when the case is attached to the device's main body, and to interrupt the series electrical connection when the case is detached from the device's main body.Type: GrantFiled: April 23, 2003Date of Patent: January 9, 2007Assignee: Matsushita Electric Works, Ltd.Inventors: Atsumasa Kubota, Toshiharu Ohashi
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Publication number: 20060214639Abstract: A charging device includes a charging unit; a detection unit for detecting a temperature and a temperature increasing rate of a rechargeable battery; a controller for controlling the charging unit to supply a charging current to the rechargeable battery; and a compensating unit for setting a value of the first threshold to be greater if the temperature of the rechargeable battery at the time of mounting the rechargeable battery on the charging device is equal to or smaller than a second threshold and smaller if otherwise. The charging unit stops supplying the charging current to the rechargeable battery if the temperature increasing rate is equal to or greater than a first threshold.Type: ApplicationFiled: March 24, 2006Publication date: September 28, 2006Applicant: Matsushita Electric Works, Ltd.Inventors: Tatsuya Miwa, Atsumasa Kubota, Naoki Shimizu, Masaki Ikeda
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Publication number: 20060179473Abstract: A power tool system with enhanced antitheft capability has a hand-held power tool and a wearable piece worn by the user. The wearable piece incorporates a certification unit which stores an identification code specifying the power tool and transmits the identification code to an authenticator incorporated in the power tool. The authenticator reads the identification code from the certification unit and to provide an authentication signal when the identification code is authenticated to be eligible for a privileged use of the power tool. The power tool is enabled only in response to the authentication signal, and otherwise disabled for avoiding unauthorized use. A communication is established between the certification unit and the authenticator for transmission of the identification code, while the user holds the power tool with the wearable piece carried on.Type: ApplicationFiled: February 9, 2006Publication date: August 10, 2006Applicant: MATSUSHITA ELECTRIC WORKS, LTD.Inventors: Teruhisa Innami, Masaki Ikeda, Naotake Tanaka, Atsumasa Kubota, Tatsuya Miwa
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Publication number: 20060076921Abstract: A constant-current battery charger includes a power supply for supplying a charge current to a secondary cell, and a current monitor for monitoring a charge current being supplied to the cell. A controller is included for varying the charge current in accordance with the monitored charge current. The controller calculates a current difference between a predetermined target current and the instant charge current, and generates a demand of varying the charge current at a first charge rate when the current difference is out of a predetermined range, and varying the charge current at a second charge rate when the current difference is within the predetermined range. The controller generates the demand repeatedly at regular or varying intervals for varying the charge current. The first charge rate is set to be higher than the second charge rate in order to make a rapid charging until it comes close to the target current.Type: ApplicationFiled: September 29, 2005Publication date: April 13, 2006Applicant: MATSUSHITA ELECTRIC WORKS, LTD.Inventors: Atsumasa Kubota, Tatsuya Miwa, Masaki Ikeda, Naoki Shimizu
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Publication number: 20050194935Abstract: A charging control system. The system has a function as a switch controller which includes a charge mode judging executor 66, a charging time monitoring executor 68 and a switch controlling executor 72. The executor 66 judges whether present control is a constant current control or a constant voltage control. The executor 68 monitors whether or not a constant current charging time exceeds a threshold time by utilizing a judging result of the executor 66. The executor 72 turns a switch 54 off when a monitoring result of the executor 68 indicates that the constant current charging time exceeds the threshold time.Type: ApplicationFiled: February 23, 2005Publication date: September 8, 2005Inventors: Atsumasa Kubota, Toshiharu Ohashi
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Publication number: 20040257033Abstract: The battery pack used for the battery powered electrical device of the present invention comprises a case for accommodating at least two battery modules, a switching means provided on a side of the case, and an output terminal formed on the case. The switching means selectively closes and opens a series electrical connection of the at least two battery modules. The switching means cooperates with an actuator, which is provided on a side of a device's main body holding the battery pack detachably, to establish the series electrical connection when the case is attached to the device's main body, and to interrupt the series electrical connection when the case is detached from the device's main body.Type: ApplicationFiled: March 8, 2004Publication date: December 23, 2004Inventors: Atsumasa Kubota, Toshiharu Ohashi
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Patent number: 6683396Abstract: A portable motor powered device capable of operating on a cordless battery pack as well as a corded power pack, yet enabling to reduce the size and weight of the corded power pack to be truly compatible with the corded battery pack in size and weight. The device has a housing accommodating therein a DC motor as a power source. The cordless battery pack is detachably connected to the housing and has a battery which supplies a low DC voltage for operating the DC motor. The corded power pack is detachably connected to the housing and supplies a high DC voltage for operating the DC motor. The corded power pack includes a power cord adapted to be connected to receive an AC source voltage and a converter for converting the AC source voltage into the high DC voltage. The DC motor has a rotor provided with first and second windings which are selectively connected to receive low and high DC voltages respectively from the cordless battery pack and the corded power pack.Type: GrantFiled: February 14, 2003Date of Patent: January 27, 2004Assignee: Matsushita Electric Works, Ltd.Inventors: Yosuke Ishida, Tomio Yamada, Toru Murakita, Kazuto Toyama, Koichi Hashimoto, Hiroshi Miyazaki, Atsumasa Kubota, Masao Yamamoto