Patents by Inventor Takashi Hasunuma
Takashi Hasunuma 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: 11594877Abstract: An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer comprises a polymer matrix and carbon black. The polymer matrix comprises a fluoropolymer having a melting point higher than 150° C. The carbon black is dispersed in the polymer matrix. A resistance jump Rjump_1000@16V/50A of the over-current protection device at 16V/50 A by 1000 cycles is 0.80-1.20. A resistance jump Rjump_1000@25V/50A of the over-current protection device at 25V/50 A by 1000 cycles is 0.90-1.30.Type: GrantFiled: August 25, 2021Date of Patent: February 28, 2023Assignee: POLYTRONICS TECHNOLOGY CORP.Inventors: Zhen Yu Dong, Yung Hsien Chang, Hsiu Che Yen, Yao Te Chang, Fu Hua Chu, Takashi Hasunuma
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Publication number: 20220399716Abstract: An over-current protection device comprises first and second electrode layers and a PTC material layer laminated therebetween. The PTC material layer comprises a polymer matrix and carbon black. The polymer matrix comprises a fluoropolymer having a melting point higher than 150° C. The carbon black is dispersed in the polymer matrix. A resistance jump Rjump_1000@16V/50A of the over-current protection device at 16V/50 A by 1000 cycles is 0.80-1.20. A resistance jump R1000@16V/50A of the over-current protection device at 25V/50 A by 1000 cycles is 0.90-1.30.Type: ApplicationFiled: August 25, 2021Publication date: December 15, 2022Inventors: ZHEN YU DONG, YUNG HSIEN CHANG, HSIU CHE YEN, YAO TE CHANG, Fu Hua Chu, TAKASHI HASUNUMA
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Publication number: 20220123515Abstract: A laser device includes at least one light source; a delivery fiber configured to propagate laser light launched from the light source; a monitor fiber optically coupled to the delivery fiber and configured to propagate a part of the light propagating in a direction opposite to a propagation direction of the laser light in the delivery fiber, and a light receiving unit configured to receive the light propagated by the monitor fiber. The light receiving unit is configured to detect first light included in a wavelength band of visible light.Type: ApplicationFiled: February 27, 2020Publication date: April 21, 2022Applicant: Fujikura Ltd.Inventors: Takashi Hasunuma, Shinichi Sakamoto, Yasuto Chiba, Wataru Kiyoyama, Yutaka Yamaguchi
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Publication number: 20220094132Abstract: A laser device includes at least one light source; a delivery fiber that is configured to propagate of laser light emitted from the light source; and a first light detection unit and a second light detection unit configured to detect a part of light propagating in a direction opposite to a propagation direction of the laser light through the delivery fiber. The first light detection unit detects first light included in a wavelength band of visible light. The second light detection unit detects second light included in a wavelength band of near-infrared light.Type: ApplicationFiled: February 27, 2020Publication date: March 24, 2022Applicant: Fujikura Ltd.Inventors: Shinichi Sakamoto, Yasuto Chiba, Wataru Kiyoyama, Yutaka Yamaguchi, Takashi Hasunuma
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Patent number: 9923362Abstract: The present invention provides a protection device which includes a PTC component and a first non-resettable contact component which is connected electrically in parallel to the PTC component. A second non-resettable contact component is connected electrically in series to the PTC component, and when the PTC component is tripped by a current which is diverted by opening the contact of the first non-resettable contact component, the contact of the second non-resettable contact component opens due to heat which is generated by the PTC component.Type: GrantFiled: December 17, 2012Date of Patent: March 20, 2018Assignee: Littelfuse, Inc.Inventors: Takashi Hasunuma, Arata Tanaka, Katsuaki Suzuki, Masayuki Oohira
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Publication number: 20160189897Abstract: An object of the present invention is to provide a protection device which is able to provide suitable protection against excessive current and the abnormal high temperature, has large holding current and does not have mechanical contact. The present invention provides a protection device including (i) at least one PTC component and (ii) a thermal fuse component, wherein each PTC component and the thermal fuse component are connected to each other electrically in parallel; the thermal fuse component is under the influence of heat of at least one PTC component; and in a normal state, a current flows substantially through each PTC component and the thermal fuse component.Type: ApplicationFiled: July 17, 2014Publication date: June 30, 2016Applicant: Tyco Electronics Japan G.K.Inventors: Takashi Hasunuma, Arata Tanaka, Toshikazu Yamaoka
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Publication number: 20150229118Abstract: The present invention provide a protection device which comprises a PTC component and a first non-resettable contact component which is connected electrically in parallel to the PTC component, characterized in that a second non-resettable contact component is connected electrically in series to the PTC component, and when the PTC component is tripped by a current which is diverted by opening the contact of the first non-resettable contact component, the contact of the second non-resettable contact component opens due to heat which is generated by the PTC component.Type: ApplicationFiled: December 17, 2012Publication date: August 13, 2015Applicant: Tyco Electronics Japan G.K.Inventors: Takashi Hasunuma, Arata Tanaka, Katsuaki Suzuki, Masayuki Oohira
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Patent number: 8174811Abstract: The present invention provides an overheat protection device which is capable of effectively preventing a secondary battery from overheating. In the overheat protection device (20), a variable resistive element(s) (11) of which resistance varies depending on a temperature is located on and thermally combined with a certain position(s) of an electrical system (1), and a switching element (15) for controlling a current depending on an applied voltage thereto is arranged so as to control the current flowing through the electrical system (1). When the certain position of the electrical system (1) comes to be under a high temperature condition, the variable resistive element (11) interrupts the current flowing through the electrical system (1) by changing the applied voltage to the switching element (15).Type: GrantFiled: November 2, 2004Date of Patent: May 8, 2012Assignee: Tyco Electronics Japan G.K.Inventors: Takashi Hasunuma, Takashi Sato
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Patent number: 8098067Abstract: The present invention provides a fluxgate magnetic sensor element which includes: a substrate; an exciting pattern which is disposed on the substrate to generate a magnetic field; a magnetic thin film pattern for detection which is disposed adjacent to the exciting pattern; and a detection coil pattern which is disposed adjacent to the magnetic thin film pattern for detection. In the magnetic sensor element, the exciting pattern, the magnetic thin film pattern for detection, and the detection coil pattern are formed on the substrate. Therefore, the magnetic sensor element can be formed into a flat shape. Moreover, since the length of the generated magnetic field is short in a long-axis direction, the size and thickness of the element itself can be reduced.Type: GrantFiled: March 29, 2007Date of Patent: January 17, 2012Assignee: Citizen Electronics Co., Ltd.Inventor: Takashi Hasunuma
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Publication number: 20100328832Abstract: An electric device that functions either as a reverting (resettable) type element or a non-reverting (non-resettable) type element depending on the conditions. Such an element includes a polymer PTC element and a temperature fuse member connected in series thereto, the temperature fuse member placed such that it is under the thermal influence of the polymer PTC element. A melting point of a metal composing the temperature fuse member is at least 5° C. higher than a melting point of a polymer composing the polymer PTC element.Type: ApplicationFiled: July 27, 2006Publication date: December 30, 2010Inventors: Takashi Hasunuma, Johnny Lam, Katsuaki Suzuki
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Publication number: 20100015522Abstract: There is provided a more compact battery pack which is characterized in that the battery pack includes a PTC device (120) and a secondary battery which comprises a canister (100) and a sealing piece (102) which seals an opening of the canister wherein the sealing piece includes the PTC device which is attached on top of the sealing piece.Type: ApplicationFiled: May 11, 2006Publication date: January 21, 2010Inventors: Takashi Hasunuma, Arata Tanaka, Hiroyuki Koyama
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Publication number: 20090243609Abstract: The present invention provides a fluxgate magnetic sensor element which includes: a substrate; an exciting pattern which is disposed on the substrate to generate a magnetic field; a magnetic thin film pattern for detection which is disposed adjacent to the exciting pattern; and a detection coil pattern which is disposed adjacent to the magnetic thin film pattern for detection. In the magnetic sensor element, the exciting pattern, the magnetic thin film pattern for detection, and the detection coil pattern are formed on the substrate. Therefore, the magnetic sensor element can be formed into a flat shape. Moreover, since the length of the generated magnetic field is short in a long-axis direction, the size and thickness of the element itself can be reduced.Type: ApplicationFiled: March 29, 2007Publication date: October 1, 2009Applicant: CITIZEN ELECTRONICS CO., LTDInventor: Takashi Hasunuma
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Publication number: 20070210893Abstract: The present invention provides an overheat protection device which is capable of effectively preventing a secondary battery from overheating. In the overheat protection device (20), a variable resistive element(s) (11) of which resistance varies depending on a temperature is located on and thermally combined with a certain position(s) of an electrical system (1), and a switching element (15) for controlling a current depending on an applied voltage thereto is arranged so as to control the current flowing through the electrical system (1). When the certain position of the electrical system (1) comes to be under a high temperature condition, the variable resistive element (11) interrupts the current flowing through the electrical system (1) by changing the applied voltage to the switching element (15).Type: ApplicationFiled: November 2, 2004Publication date: September 13, 2007Applicant: Tyco Electronics Raychem KKInventors: Takashi Hasunuma, Takashi Sato
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Patent number: 6862164Abstract: A circuit protection arrangement particularly useful in protecting battery assemblies. The arrangement contains a first PTC device which has a first switching temperature Ts1, has a resistance at 20° C. R1, has a hold current at a first specified temperature IH1, and is made from a first PTC resistive element composed of a first conductive polymer composition attached to first and second electrodes, and a second PTC device which is electrically connected in series with the first PTC device, has a second switching temperature Ts2 which is less than Ts1, has a resistance at 20° C. R2 which is less than R1, has a hold current at the first specified temperature IH2 which is greater than IH1, and is made from a second PTC resistive element composed of a second conductive polymer composition attached to third and fourth electrodes.Type: GrantFiled: May 7, 2002Date of Patent: March 1, 2005Assignee: Tyco Electronics Raychem K.K.Inventors: Takashi Hasunuma, Naofumi Miyasaka, Masatoshi Sakamoto, Takashi Sato
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Patent number: 6713210Abstract: A PTC device formed integrally on a PCB substrate, such a PCB substrate, a secondary battery protection circuit device comprising such PCB substrate provided with a circuit to control the voltage and current of secondary batteries, and a secondary battery assembly provided with said device. A PCB substrate 1 is provided with an electronic component 2 and a PTC device 3. The PTC device 3 has a construction having a PTC material 6 in the center, which is provided with foils 7, 7′ made of nickel foil on its top and bottom; an outlet electrode 4 is provided on the foil 7, and an outlet electrode 5, provided on the PCB substrate, is soldered below.Type: GrantFiled: March 21, 2001Date of Patent: March 30, 2004Assignee: Tyco Electronics Raychem K.K.Inventors: Takashi Sato, Naofumi Miyasaka, Takashi Hasunuma
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Publication number: 20030218529Abstract: An electrical device comprising a pair of electrodes, three substrates, and PTC elements inserted between the substrates, each PTC element having metal layers on both surfaces, in which each of the outer substrates has a metal layer on the inner surface, the two metal layers being electrically connected to one of the electrodes and in electrical contact with the respective metal layers of the PTC elements facing said metal layers of the outer substrates, and the center substrate has a metal layer on both surfaces, such metal layers being electrically connected to the other electrode and in electrical contact with the respective metal layers of the PTC elements facing said metal layers of the center substrate. This electrical device can increase the area of the PTC elements without increasing the projected area as a whole.Type: ApplicationFiled: April 1, 2003Publication date: November 27, 2003Inventors: Takashi Hasunuma, Mikio Iimura, Katsuaki Suzuki
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Patent number: 6542066Abstract: An electrical device comprising a pair of electrodes, three substrates, and PTC elements inserted between the substrates, each PTC element having metal layers on both surfaces, in which each of the outer substrates has a metal layer on the inner surface, the two metal layers being electrically connected to one of the electrodes and in electrical contact with the respective metal layers of the PTC elements facing said metal layers of the outer substrates, and the center substrate has a metal layer on both surfaces, such metal layers being electrically connected to the other electrode and in electrical contact with the respective metal layers of the PTC elements facing said metal layers of the center substrate. This electrical device can increase the area of the PTC elements without increasing the projected area as a whole.Type: GrantFiled: June 8, 2000Date of Patent: April 1, 2003Assignee: Tyco Electronics Raychem K.K.Inventors: Takashi Hasunuma, Mikio Iimura, Katsuaki Suzuki
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Patent number: 6538415Abstract: A temperature-sensing apparatus 11 which is placed in contact with a plurality of batteries, e.g. secondary batteries, connected in series. The temperature sensing apparatus can be connected to a power source 12 and a current measuring device 13 to detect increases in the temperature of the battery. Each temperature-sensing section in contact with individual secondary batteries comprises a PTC element and electrode sheets in contact with and sandwiching the PTC element on the top and bottom, the electrode sheets being in a staggered and overlapping relationship.Type: GrantFiled: April 7, 1999Date of Patent: March 25, 2003Inventors: Shou-Mean Fang, Takashi Hasunuma, Noriyuki Nagashima
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Publication number: 20020181182Abstract: A circuit protection arrangement particularly useful in protecting battery assemblies. The arrangement contains a first PTC device which has a first switching temperature Ts1 has a resistance at 20° C. R1, has a hold current at a first specified temperature IH1, and is made from a first PTC resistive element composed of a first conductive polymer composition attached to first and second electrodes, and a second PTC device which is electrically connected in series with the first PTC device, has a second switching temperature TS2 which is less than TS1, has a resistance at 20° C. R2 which is less than R1, has a hold current at the first specified temperature IH2 which is greater than IH1, and is made from a second PTC resistive element composed of a second conductive polymer composition attached to third and fourth electrodes.Type: ApplicationFiled: May 7, 2002Publication date: December 5, 2002Inventors: Takashi Hasunuma, Naofumi Miyasaka, Masatoshi Sakamoto, Takashi Sato
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Patent number: 6356051Abstract: A battery pack and a PTC device are provided that can be used safely under large current loads by increasing the area of the incorporated PTC layer so as to decrease its internal resistance. The battery pack has a plurality of unit cells (1) placed side by side in parallel and the PTC device P to protect the unit cells (1) from overcurrents. The PTC device P has a first electrode (3) and a second electrode (4) connected to the both surfaces of the PTC layer (2). The PTC layer is formed to an outer shape that covers almost the entirety of the end surfaces of the two unit cells (1) to which the first electrode (3) and the second electrode (4) are connected, and has through holes (2B) positioned against the end electrodes (1A) of the unit cells (1).Type: GrantFiled: August 18, 2000Date of Patent: March 12, 2002Assignees: Tyco Electronics Raychem K.K., Sanyo Electric Co., Ltd.Inventors: Takashi Hasunuma, Atsushi Watanabe, Kazuo Osaki, Fumiyoshi Yoshinari