Patents by Inventor Koji Ejima
Koji Ejima 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: 10985128Abstract: An anisotropic conductive film has a structure in which high hardness conductive particles having a 20% compression elastic modulus of 8000 to 28000 N/mm2 and low hardness conductive particles having a lower 20% compression elastic modulus than that of the high hardness conductive particles are dispersed as conductive particles in an insulating resin layer. The number density of all the conductive particles is 6000 particles/mm2 or more, and the number density of the low hardness conductive particles is 10% or more of that of all the conductive particles.Type: GrantFiled: November 20, 2017Date of Patent: April 20, 2021Assignee: DEXERIALS CORPORATIONInventors: Koji Ejima, Kenichi Hirayama, Reiji Tsukao
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Publication number: 20190304943Abstract: An anisotropic conductive film has a structure in which high hardness conductive particles having a 20% compression elastic modulus of 8000 to 28000 N/mm2 and low hardness conductive particles having a lower 20% compression elastic modulus than that of the high hardness conductive particles are dispersed as conductive particles in an insulating resin layer. The number density of all the conductive particles is 6000 particles/mm2 or more, and the number density of the low hardness conductive particles is 10% or more of that of all the conductive particles.Type: ApplicationFiled: November 20, 2017Publication date: October 3, 2019Applicant: DEXERIALS CORPORATIONInventors: Koji EJIMA, Kenichi HIRAYAMA, Reiji TSUKAO
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Patent number: 10177465Abstract: An electrically conductive material with which excellent conduction reliability can be achieved for an oxide layer. The electrically conductive material contains electrically conductive particles including resin core particles, a plurality of electrically insulating particles being disposed on the surface of the resin core particles and forming protrusions, and an electrically conductive layer being disposed on the surface of the resin core particles and the electrically insulating particles, a Mohs' hardness of the electrically insulating particles being greater than 7. As a result, the electrically conductive particles pierce and sufficiently penetrate the oxide layer of the electrode surface so that excellent conduction reliability can be achieved.Type: GrantFiled: October 28, 2015Date of Patent: January 8, 2019Assignee: DEXERIALS CORPORATIONInventors: Kenichi Hirayama, Hiromi Kubode, Koji Ejima
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Patent number: 10109439Abstract: To spread flux evenly across the entire surface of a rectangular meltable conductor, a protective element includes: an insulating substrate; a heat-generating resistor disposed on the insulating substrate; a first and a second electrodes laminated onto the insulating substrate; a heat-generating element extracting electrode overlapping the heat-generating resistor in a state electrically insulated therefrom and electrically connected to the heat-generating resistor on a current path between the first and the second electrodes; a rectangular meltable conductor laminated between the heat-generating element extracting electrode and the first and the second electrodes for interrupting a current path between the first electrode and the second electrode by being melted by heat; and a plurality of flux bodies disposed on the meltable conductor; wherein the flux bodies are disposed along the heat-generating resistor.Type: GrantFiled: April 24, 2014Date of Patent: October 23, 2018Assignee: DEXERIALS CORPORATIONInventors: Chisato Komori, Koichi Mukai, Kazutaka Furuta, Toshiaki Araki, Koji Ejima, Takashi Fujihata
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Publication number: 20170310020Abstract: An electrically conductive material with which excellent conduction reliability can be achieved for an oxide layer. The electrically conductive material contains electrically conductive particles including resin core particles, a plurality of electrically insulating particles being disposed on the surface of the resin core particles and forming protrusions, and an electrically conductive layer being disposed on the surface of the resin core particles and the electrically insulating particles, a Mohs' hardness of the electrically insulating particles being greater than 7. As a result, the electrically conductive particles pierce and sufficiently penetrate the oxide layer of the electrode surface so that excellent conduction reliability can be achieved.Type: ApplicationFiled: October 28, 2015Publication date: October 26, 2017Applicant: DEXERIALS CORPORATIONInventors: Kenichi HIRAYAMA, Hiromi KUBODE, Koji EJIMA
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Patent number: 9337671Abstract: A protective element including a substrate having a first insulating member and a concave portion formed thereon, a heating body layered on the concave portion of the substrate, a second insulating member layered on the substrate so as to cover at least covering the heating body, first and second electrodes layered on a surface of the substrate on which the second insulating member is layered, a heating body electrode layered on the second insulating member so as to be superimposed with the heating body, and electrically connected to a current path between the first and the second electrodes as well as onto and the heating body, and a low-melting point metal layered from the heating body electrode toward the first and the second electrodes configured to cause a blowout of the current path between the first and the second electrodes by heating.Type: GrantFiled: December 17, 2012Date of Patent: May 10, 2016Assignee: Dexerials CorporationInventors: Chisato Komori, Yuji Furuuchi, Yoshihiro Yoneda, Koichi Mukai, Koji Ejima, Takashi Fujihata, Kazutaka Furuta, Toshiaki Araki
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Publication number: 20160049272Abstract: To spread flux evenly across the entire surface of a rectangular meltable conductor, a protective element includes: an insulating substrate; a heat-generating resistor disposed on the insulating substrate; a first and a second electrodes laminated onto the insulating substrate; a heat-generating element extracting electrode overlapping the heat-generating resistor in a state electrically insulated therefrom and electrically connected to the heat-generating resistor on a current path between the first and the second electrodes; a rectangular meltable conductor laminated between the heat-generating element extracting electrode and the first and the second electrodes for interrupting a current path between the first electrode and the second electrode by being melted by heat; and a plurality of flux bodies disposed on the meltable conductor; wherein the flux bodies are disposed along the heat-generating resistor.Type: ApplicationFiled: April 24, 2014Publication date: February 18, 2016Inventors: Chisato KOMORI, Koichi MUKAI, Kazutaka FURUTA, Toshiaki ARAKI, Koji EJIMA, Takashi FUJIHATA
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Patent number: 9130383Abstract: A charging/discharging control device that can protect a chargeable/dischargeable battery cell from an excess current state while preventing the device from being increased in scale and from being complex. The charging/discharging control device includes: switches that are connected in parallel on current paths between a battery and a positive terminal of a battery pack; a switching control unit that switches between a charging current path and a discharging current path; a protective element that fuses the charging current path when a current value of the charging current path flowing through the switch exceeds a first fusing current value; and a protective element that fuses the discharging current path when a current value of the discharging current path flowing through the switch exceeds a second fusing current value higher than the first fusing current value.Type: GrantFiled: April 19, 2012Date of Patent: September 8, 2015Assignee: DEXERIALS CORPORATIONInventors: Koichi Mukai, Yuji Furuuchi, Toshiaki Araki, Chisato Komori, Koji Ejima, Takashi Fujihata
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Publication number: 20150044514Abstract: To realize a protection member that makes a flux amount applied on a fusible conductor uniform, and improves variation of fusing characteristics. The protection member includes an insulating substrate, a heating body, an insulating member, two electrodes, a heating body internal electrode, a fusible conductor layered from the heating body internal electrode to the two electrodes, and configured to fuse a current path between the two electrodes by heating, flux applied on the fusible conductor to superimpose with the heating body, and a cover member covering at least the fusible conductor and attached to the insulating substrate. The cover member further includes a plurality of cylindrical projection portions facing the heating body and formed on an inner surface of the cover member to be in contact with the flux.Type: ApplicationFiled: March 14, 2013Publication date: February 12, 2015Inventors: Yuji Kimura, Kouichi Mukai, Yuji Furuuchi, Koji Ejima
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Publication number: 20140340046Abstract: A protective element including a substrate having a first insulating member and a concave portion formed thereon, a heating body layered on the concave portion of the substrate, a second insulating member layered on the substrate so as to cover at least covering the heating body, first and second electrodes layered on a surface of the substrate on which the second insulating member is layered, a heating body electrode layered on the second insulating member so as to be superimposed with the heating body, and electrically connected to a current path between the first and the second electrodes as well as onto and the heating body, and a low-melting point metal layered from the heating body electrode toward the first and the second electrodes configured to cause a blowout of the current path between the first and the second electrodes by heating.Type: ApplicationFiled: December 17, 2012Publication date: November 20, 2014Applicant: Dexerials CorporationInventors: Chisato Komori, Yuji Furuuchi, Yoshihiro Yoneda, Koichi Mukai, Koji Ejima, Takashi Fujihata, Kazutaka Furuta, Toshiaki Araki
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Publication number: 20130181681Abstract: A charging/discharging control device that can protect a chargeable/dischargeable battery cell from an excess current state while preventing the device from being increased in scale and from being complex. The charging/discharging control device includes: switches that are connected in parallel on current paths between a battery and a positive terminal of a battery pack; a switching control unit that switches between a charging current path and a discharging current path; a protective element that fuses the charging current path when a current value of the charging current path flowing through the switch exceeds a first fusing current value; and a protective element that fuses the discharging current path when a current value of the discharging current path flowing through the switch exceeds a second fusing current value higher than the first fusing current value.Type: ApplicationFiled: April 19, 2012Publication date: July 18, 2013Applicant: DEXERIALS CORPORATIONInventors: Koichi Mukai, Yuji Furuuchi, Toshiaki Araki, Chisato Komori, Koji Ejima, Takashi Fujihata