Patents by Inventor Tokihiro Yoshikawa
Tokihiro Yoshikawa 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: 20240029976Abstract: A protective element includes: at least two electrode portions (main electrodes) supported by an insulating support (insulating substrate); a fuse element that connects the electrode portions; and an operating flux provided on the fuse element. The operating flux has, on a surface thereof, a coating layer that covers the operating flux to prevent the operating flux from flowing.Type: ApplicationFiled: September 26, 2023Publication date: January 25, 2024Inventors: Shintaro NAKAJIMA, Masayuki MATSUMOTO, Tokihiro YOSHIKAWA, Shuichi HORI
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Publication number: 20230197393Abstract: Problem To maintain a low internal resistance value and adjust spring characteristics by using a movable contact made of a multilayered material. Means for Solving Problem A thermosensitive pellet-type thermal fuse includes, in an interior of a cylindrical case having electrical conductivity, a thermosensitive pellet that melts or softens at a temperature, a strong compression spring configured to press the thermosensitive pellet, an insulating cover closing the cylindrical case, a weak compression spring abutting against the insulating cover, a first lead extending through the insulating cover and including an inner end as a fixed contact, a movable contact electrically connecting to the first lead and the cylindrical case, a sealing resin provided surrounding a portion of the first lead and covering an outer end portion of the insulating cover, and sealing an open end portion of the cylindrical case, and a second lead disposed at one end of the cylindrical case.Type: ApplicationFiled: December 16, 2022Publication date: June 22, 2023Inventor: Tokihiro YOSHIKAWA
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Publication number: 20230094205Abstract: Provided is a temperature-sensitive pellet-type thermal fuse having excellent reliability including an insulation property after having operated. The fuse includes, in a tubular case with high electrical conductivity and high thermal conductivity, at least a temperature-sensitive pellet being capable of melting and softening at a specific temperature, a strong compression spring pressing the temperature-sensitive pellet, an insulating lid body closing an end portion of an opening of the tubular case, a weak compression spring being in contact with the insulating lid body, a first lead having an inner end penetrating the insulating lid body as a stationary contact, and a movable contact electrically connected to the first lead and the tubular case, and further includes a second lead disposed at an end of the tubular case.Type: ApplicationFiled: April 8, 2021Publication date: March 30, 2023Applicant: SCHOTT JAPAN CORPORATIONInventors: Tokihiro YOSHIKAWA, Eigo KISHI, Tamotsu WAKABAYASHI
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Publication number: 20220293371Abstract: A protective element includes: at least two electrode portions (main electrodes) supported by an insulating support (insulating substrate); a fuse element that connects the electrode portions; and an operating flux provided on the fuse element. The operating flux has, on a surface thereof, a coating layer that covers the operating flux to prevent the operating flux from flowing.Type: ApplicationFiled: April 12, 2021Publication date: September 15, 2022Inventors: Shintaro NAKAJIMA, Masayuki MATSUMOTO, Tokihiro YOSHIKAWA, Shuichi HORI
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Patent number: 11062863Abstract: The temperature sensitive pellet type thermal fuse includes a cylindrical case which has a first end and a second end, a temperature sensitive pellet, an insulating tube, a first lead which is inserted into the insulating tube and has an inner end serving as a contact portion, a movable contact which is electrically connected to the cylindrical case, a weak compression spring, a strong compression spring, and a second lead which is disposed on the second end of the cylindrical case. The movable contact includes a projecting contact portion which is provided at a central part of the movable contact, and the projecting contact portion and the contact portion of the first lead are in contact with each other inside the insulating tube.Type: GrantFiled: September 13, 2018Date of Patent: July 13, 2021Assignee: SCHOTT Japan CorporationInventors: Tokihiro Yoshikawa, Toru Fujita, Noriyuki Maeda, Yuichi Nozaki, Ryota Sekioka
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Patent number: 11062869Abstract: The temperature sensitive pellet type thermal fuse includes: a conductive envelope having an opening at a first end; a temperature sensitive device housed inside the envelope; a first lead which is installed in the opening of the envelope and has a fixed contact; a second lead connected to a second end of the envelope; a movable contact housed in the envelope; and a weak compression spring housed in the envelope. The temperature sensitive device includes a cylindrical case having an open end which may be arranged at the side of the first lead, a temperature sensitive material housed in the cylindrical case, and a strong compression spring configured to press against the temperature sensitive material.Type: GrantFiled: December 11, 2018Date of Patent: July 13, 2021Assignee: SCHOTT Japan CorporationInventors: Eigo Kishi, Akira Nakanishi, Tamotsu Wakabayashi, Tokihiro Yoshikawa
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Publication number: 20210066008Abstract: The temperature sensitive pellet type thermal fuse includes a cylindrical case which has a first end and a second end, a temperature sensitive pellet, an insulating tube, a first lead which is inserted into the insulating tube and has an inner end serving as a contact portion, a movable contact which is electrically connected to the cylindrical case, a weak compression spring, a strong compression spring, and a second lead which is disposed on the second end of the cylindrical case. The movable contact includes a projecting contact portion which is provided at a central part of the movable contact, and the projecting contact portion and the contact portion of the first lead are in contact with each other inside the insulating tube.Type: ApplicationFiled: September 13, 2018Publication date: March 4, 2021Inventors: Tokihiro YOSHIKAWA, Toru FUJITA, Noriyuki MAEDA, Yuichi NOZAKI, Ryota SEKIOKA
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Publication number: 20200144013Abstract: The temperature sensitive pellet type thermal fuse includes: a conductive envelope having an opening at a first end; a temperature sensitive device housed inside the envelope; a first lead which is installed in the opening of the envelope and has a fixed contact; a second lead connected to a second end of the envelope; a movable contact housed in the envelope; and a weak compression spring housed in the envelope. The temperature sensitive device includes a cylindrical case having an open end which may be arranged at the side of the first lead, a temperature sensitive material housed in the cylindrical case, and a strong compression spring configured to press against the temperature sensitive material.Type: ApplicationFiled: December 11, 2018Publication date: May 7, 2020Inventors: Eigo KISHI, Akira NAKANISHI, Tamotsu WAKABAYASHI, Tokihiro YOSHIKAWA
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Patent number: 10340642Abstract: A fuse-equipped hermetic terminal includes: a housing provided with a hollow portion and a pair of through holes located with the hollow portion being interposed therebetween; a conductive pin extending through the housing via the pair of through holes and the hollow portion; and a pair of insulating sealing materials that each hermetically seal a gap between the conductive pin and a corresponding one of the pair of through holes. Each of the conductive pins includes an inner pin, an outer pin, and a fuse element that bridges between the inner pin and the outer pin and that is located in the hollow portion.Type: GrantFiled: July 1, 2016Date of Patent: July 2, 2019Assignee: SCHOTT Japan CorporationInventors: Hiroki Honda, Hidehiko Harada, Yusuke Maegawa, Tokihiro Yoshikawa
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Publication number: 20180198243Abstract: A fuse-equipped hermetic terminal includes: a housing provided with a hollow portion and a pair of through holes located with the hollow portion being interposed therebetween; a conductive pin extending through the housing via the pair of through holes and the hollow portion; and a pair of insulating sealing materials that each hermetically seal a gap between the conductive pin and a corresponding one of the pair of through holes. Each of the conductive pins includes an inner pin, an outer pin, and a fuse element that bridges between the inner pin and the outer pin and that is located in the hollow portion.Type: ApplicationFiled: July 1, 2016Publication date: July 12, 2018Inventors: Hiroki HONDA, Hidehiko HARADA, Yusuke MAEGAWA, Tokihiro YOSHIKAWA
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Patent number: 9460883Abstract: A temperature fuse includes a cylindrical metal case, a sliding electrode slidable over an inner surface of the metal case, and a terminal electrically connected to the metal case while the sliding electrode is in contact therewith, during activation, the sliding electrode moving away from the terminal so that electrical connection between the metal case and the terminal is cut off, the sliding electrode being formed by working a thin metal plate, the sliding electrode including at least a base material layer composed of copper or a copper alloy and a first surface layer composed of silver or a silver alloy, and a site of contact with the terminal being the first surface layer having a thickness not smaller than 5 ?m.Type: GrantFiled: November 19, 2012Date of Patent: October 4, 2016Assignee: NEC SCHOTT Components CorporationInventor: Tokihiro Yoshikawa
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Publication number: 20140306794Abstract: A temperature fuse includes a cylindrical metal case, a sliding electrode slidable over an inner surface of the metal case, and a terminal electrically connected to the metal case while the sliding electrode is in contact therewith, during activation, the sliding electrode moving away from the terminal so that electrical connection between the metal case and the terminal is cut off, the sliding electrode being formed by working a thin metal plate, the sliding electrode including at least a base material layer composed of copper or a copper alloy and a first surface layer composed of silver or a silver alloy, and a site of contact with the terminal being the first surface layer having a thickness not smaller than 5 ?m.Type: ApplicationFiled: November 19, 2012Publication date: October 16, 2014Applicant: NEC SCHOTT Components CorporationInventor: Tokihiro Yoshikawa
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Patent number: 7843307Abstract: A thermal fuse employing a thermosensitive pellet is provided, which exhibits stabilized characteristics in a low operating temperature region. The thermal fuse includes at least a switching movable member, a thermosensitive pellet member, a pair of leads having a first lead portion and a second lead portion, and a metal casing. The thermosensitive pellet member contains a polyolefin wax. The thermosensitive pellet member is housed in the metal casing to which the pair of leads are attached. The switching movable member is operated by deformation associated with softening or melting of the thermosensitive pellet member, to attain a cut-off state between the pair of leads. The thermal fuse employing a thermosensitive pellet is suitable for an operating temperature of 50 to 180° C.Type: GrantFiled: September 23, 2008Date of Patent: November 30, 2010Assignee: NEC SCHOTT Components CorporationInventor: Tokihiro Yoshikawa
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Publication number: 20090179729Abstract: A thermal fuse includes a metallic casing, a first lead member having a first electrode formed at an end thereof, a second lead member having a second electrode formed at an internal wall surface of the casing, a switching function member including a spring member pressing a thermosensitive pellet and a movable conductor. At an operating temperature as the thermosensitive pellet softens and melts, the thermal fuse switches an electrical circuit between the first and second electrodes. In order to respond and switch more quickly at the operating temperature, the thermosensitive pellet is produced to have a structure that facilitates activation thereof at the operating temperature. Such a structure may involve at least one cavity incorporated in the pellet, or may involve at least two different resin materials that are mixed together or provided in plural layers in the pellet.Type: ApplicationFiled: March 18, 2009Publication date: July 16, 2009Applicant: NEC SCHOTT Components CorporationInventor: Tokihiro Yoshikawa
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Publication number: 20090091417Abstract: A thermal fuse employing a thermosensitive pellet is provided which uses a new substance exhibiting stabilized characteristics as a thermosensitive material used in the case where the thermal fuse employing a thermosensitive pellet has an operating temperature in a low temperature region. The thermal fuse employing a thermosensitive pellet of the present invention includes at least a switching movable member, a thermosensitive pellet member, a pair of leads having a first lead portion and a second lead portion, and a metal casing, in which the thermosensitive pellet member contains a polyolefin wax, the thermosensitive pellet member is housed in the metal casing to which the pair of leads are attached, the switching movable member is operated by deformation associated with softening or melting of the thermosensitive pellet member, to attain a cut-off state between the pair of leads, and the thermal fuse employing a thermosensitive pellet is suitable for an operating temperature of 50 to 180° C.Type: ApplicationFiled: September 23, 2008Publication date: April 9, 2009Applicant: NEC SCHOTT Components CorporationInventor: Tokihiro Yoshikawa
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Patent number: 7362208Abstract: In order to prevent erroneous operation caused by shrinking of a thermal pellet due to sublimation or softening of the thermal pellet when current is applied, a thermal pellet type thermal fuse includes a metal casing, a first lead and a second lead leading out from the metal casing, a movable electrode, a thermal pellet, a strong compression spring, and a weak compression spring. Difference in temperature is achieved at the surface of the metal casing by selecting different diameters or wires for the first lead and the second lead, or by providing a heat-radiating plate.Type: GrantFiled: September 15, 2005Date of Patent: April 22, 2008Assignee: NEC SCHOTT Components CorporationInventors: Tokihiro Yoshikawa, Masahiro Nishikawa
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Patent number: 7330098Abstract: There is provided a thermal fuse employing a thermosensitive pellet that reacts to an operating temperature with limited variation, and operates with high precision and hence high reliability. To achieve this, the thermal fuse includes a switching function member including a thermosensitive pellet, a movable conductor, and a spring member. At a prescribed operating temperature the thermosensitive pellet softens or melts to liberate the spring member from a load to cause the spring member to move the movable conductor to switch an electrical circuit located between first and second lead members. The thermosensitive pellet is formed of a thermosensitive material selected depending on a characteristic in flowability presented as it softens or melts.Type: GrantFiled: August 12, 2005Date of Patent: February 12, 2008Assignee: NEC SCHOTT Components CorporationInventor: Tokihiro Yoshikawa
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Patent number: 7323966Abstract: A thermal fuse incorporating a thermal pellet has its operating temperature, or heat distortion temperature, adjusted and the thermosensitive material of the pellet avoids deformation, modification or similar deficiency if it is exposed to a severe external environment. The inexpensive thermal fuse provides a wider range from which an operating temperature can be selected, improved insulation resistance after operation, faster response speed in operation, and enhanced strength of the thermal pellet. The thermosensitive material is formed of a thermoplastic resin corresponding to a high molecular weight substance. The thermal pellet's heat distortion temperature is adjusted by a temperature setting method. An enclosure of the fuse has a metal casing with a spring member's strong and weak compression springs both accommodated therein and hermetically sealed.Type: GrantFiled: October 22, 2004Date of Patent: January 29, 2008Assignee: NEC SCHOTT Components CorporationInventor: Tokihiro Yoshikawa
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Patent number: 7323965Abstract: In the present invention, a physical and chemical property of thermosensitive material is noted in selecting and using thermosensitive material to provide a noble and improved thermal fuse using thermosensitive material. To achieve this object, the present thermal fuse includes: a thermosensitive material formed of thermoplastic resin fusing at a prescribed temperature; a cylindrical enclosure accommodating the thermosensitive material; a first lead member attached at one opening of the enclosure, forming a first electrode; a second lead member attached at the other opening of the enclosure, forming a second electrode; a movable conductive member accommodated in the enclosure and engaged with the thermosensitive material; and a spring member accommodated in the enclosure, and pressed against and thus acting on the movable conductive member. When the thermosensitive material fuses at an operating temperature an electrical circuit between the first and second electrodes is switched.Type: GrantFiled: April 22, 2003Date of Patent: January 29, 2008Assignee: NEC SCHOTT Components CorporationInventor: Tokihiro Yoshikawa
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Publication number: 20070236324Abstract: In order to prevent erroneous operation caused by shrinking of a thermal pellet due to sublimation or softening of the thermal pellet when current is applied, a thermal pellet type thermal fuse includes a metal casing, a first lead and a second lead leading out from the metal casing, a movable electrode, a thermal pellet, a strong compression spring, and a weak compression spring. Difference in temperature is achieved at the surface of the metal casing by selecting different diameters or wires for the first lead and the second lead, or by providing a heat-radiating plate.Type: ApplicationFiled: September 15, 2005Publication date: October 11, 2007Inventors: Tokihiro Yoshikawa, Masahiro Nishikawa