Patents by Inventor Masaki Yoneda
Masaki Yoneda 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: 20140232515Abstract: A chip resistor includes first and second electrodes spaced apart from each other, a resistor element arranged on the first and the second electrodes, a bonding layer provided between the resistor element and the two electrodes, and a plating layer electrically connected to the resistor element. The first electrode includes a flat outer side surface, and the resistor element includes a side surface facing in the direction in which the thirst and the second electrodes are spaced. The outer side surface of the first electrode is flush with the side surface of the resistor element. The plating layer covers at least a part of the outer side surface of the first electrode in a manner such that the covering portion of the plating layer extends from one vertical edge of the outer side surface to the other vertical edge.Type: ApplicationFiled: February 19, 2014Publication date: August 21, 2014Applicant: ROHM CO., LTD.Inventors: Kenichi HARADA, Masaki YONEDA
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Patent number: 8514052Abstract: A surface-mounted resistor includes a flat-type base member having a first surface, a second surface, and a lateral surface. Each of the first and second surfaces has a rectangular shape. The surface-mounted resistor also includes a resistance element formed on the first surface; a pair of internal electrodes formed on both ends of the resistance element by being partially superposed with the resistance element; and a pair of external electrodes. Each of the external electrodes has a first bended portion having an L-shape formed by an internal electrode connection portion and a lateral portion, and a second bended portion having an L-shape formed by the lateral portion and a substrate connection portion. The internal electrode and the internal electrode connection portion are fixed to each other through a conductive fixation material, and a position of the base member is biased in a thickness direction toward the first bended portion.Type: GrantFiled: May 17, 2011Date of Patent: August 20, 2013Assignee: Rohm Co., Ltd.Inventors: Masaki Yoneda, Makoto Toyonaga
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Publication number: 20130104389Abstract: A method of manufacturing a chip resistor includes the following steps. A resistor layer is formed on an obverse surface of a material substrate. A plurality of substrate sections are defined in the material substrate by forming, in the obverse surface of the material substrate, a plurality of first grooves each of which is elongated in a first direction. A conductor layer is formed in each of the first grooves. The substrate sections are cut along lines extending in a second direction different from the first direction.Type: ApplicationFiled: December 18, 2012Publication date: May 2, 2013Applicant: ROHM CO., LTD.Inventor: Masaki YONEDA
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Patent number: 8354912Abstract: A method of manufacturing a chip resistor includes the following steps. A resistor layer is formed on an obverse surface of a material substrate. A plurality of substrate sections are defined in the material substrate by forming, in the obverse surface of the material substrate, a plurality of first grooves each of which is elongated in a first direction. A conductor layer is formed in each of the first grooves. The substrate sections are cut along lines extending in a second direction different from the first direction.Type: GrantFiled: July 20, 2010Date of Patent: January 15, 2013Assignee: Rohm Co., Ltd.Inventor: Masaki Yoneda
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Patent number: 8325006Abstract: A chip resistor includes a substrate, a pair of electrode elements, a resistive layer, and a protective layer. The substrate is insulating and includes a first surface, a second surface opposite the first surface and a thickness defined between the first and second surface. The electrode elements are formed on the first and spaced apart. The resistive layer is formed on the first surface and electrically connected to the electrode elements. The protective layer to covers the resistive layer. The first surface faces toward a mounting target, on which the chip resistor is mounted. Each of the electrode elements comprises an electrode layer and a conductive layer formed on the electrode layer. The boundary between the electrode layer and the conductive layer in each of the electrode elements is positioned closer to the substrate than the end surface of the protective layer in the thickness direction of the substrate.Type: GrantFiled: December 16, 2009Date of Patent: December 4, 2012Assignee: Rohm Co., Ltd.Inventor: Masaki Yoneda
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Publication number: 20110285498Abstract: A surface-mounted resistor includes a flat-type base member having a first surface, a second surface, and a lateral surface. Each of the first and second surfaces has a rectangular shape. The surface-mounted resistor also includes a resistance element faulted on the first surface; a pair of internal electrodes formed on both ends of the resistance element by being partially superposed with the resistance element; and a pair of external electrodes. Each of the external electrodes has a first bended portion having an L-shape formed by an internal electrode connection portion and a lateral portion, and a second bended portion having an L-shape formed by the lateral portion and a substrate connection portion. The internal electrode and the internal electrode connection portion are fixed to each other through a conductive fixation material, and a position of the base member is biased in a thickness direction toward the first bended portion.Type: ApplicationFiled: May 17, 2011Publication date: November 24, 2011Applicant: ROHM CO., LTD.Inventors: Masaki YONEDA, Makoto TOYONAGA
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Patent number: 7940158Abstract: A chip resistor (1) according to the present invention includes an insulating substrate (2) which is in the form of an elongated rectangle in plan view, a pair of upper electrodes (3, 4) in the form of a strip formed on the upper surface of the insulating substrate (2) at portions adjacent to the long side surfaces of the insulating substrate to extend along the side surfaces, a resistor film (5) formed on the upper surface of the insulating substrate (2) and electrically connected to the upper electrodes (3, 4), and a pair of terminal electrodes (6, 7) formed on the two long side surfaces of the insulating substrate and electrically connected to the upper electrodes (3, 4), respectively. One of two longitudinal ends of the resistor film (5) is connected to one of the upper electrodes (3), whereas the other one of the two longitudinal ends of the resistor film is connected to the other one of the upper electrodes (4).Type: GrantFiled: October 10, 2006Date of Patent: May 10, 2011Assignee: Rohm Co., Ltd.Inventor: Masaki Yoneda
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Publication number: 20110018677Abstract: A method of manufacturing a chip resistor includes the following steps. A resistor layer is formed on an obverse surface of a material substrate. A plurality of substrate sections are defined in the material substrate by forming, in the obverse surface of the material substrate, a plurality of first grooves each of which is elongated in a first direction. A conductor layer is formed in each of the first grooves. The substrate sections are cut along lines extending in a second direction different from the first direction.Type: ApplicationFiled: July 20, 2010Publication date: January 27, 2011Applicant: ROHM CO., LTD.Inventor: Masaki YONEDA
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Patent number: 7786842Abstract: The chip resistor (1) includes an insulating substrate (2) and a main upper electrode (4) formed on a main surface of the insulating substrate (2). On the main surface of the insulating substrate (2), a resistor film (5) including an end (5a) overlapping the upper surface of main upper electrode (4) is formed. The resistor film (5) is covered by a protective coat (7, 8). An auxiliary upper electrode (6) is formed on the upper surface of the main upper electrode (4). The auxiliary upper electrode (6) includes an inner end (6a) overlapping the upper surface of the end (5a) of the resistor film (5). The protective coat (7, 8) overlaps the inner end (6a) of the auxiliary upper electrode (6).Type: GrantFiled: February 28, 2006Date of Patent: August 31, 2010Assignee: Rohm Co., Ltd.Inventors: Torayuki Tsukada, Masaki Yoneda
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Publication number: 20100171584Abstract: A chip resistor of the present invention includes a substrate, a pair of electrode elements, a resistive layer, and a protective layer. The substrate is made of an insulating material and includes a first surface, a second surface opposite the first surface and a thickness defined between the first surface and the second surface. The electrode elements are formed on the first surface of the substrate and spaced apart from each other. The resistive layer is formed on the first surface of the substrate and electrically connected to the electrode elements. The protective layer is provided to cover the resistive layer. The first surface of the substrate is a mount side surface to face toward a mounting target, on which the chip resistor is mounted. Each of the electrode elements comprises an electrode layer and a conductive layer. The electrode layer is electrically connected directly to the resistive layer. The conductive layer is formed on the electrode layer.Type: ApplicationFiled: December 16, 2009Publication date: July 8, 2010Applicant: ROHM CO., LTD.Inventor: Masaki YONEDA
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Patent number: 7733211Abstract: A chip resistor (1) includes a chip substrate (2) a mutually separated terminal electrodes (3, 4) formed on the upper surface of the substrate (2), and a meandering resistor film (5) formed between the two terminal electrodes (3, 4). Each of the terminal electrodes (3, 4) includes an inner edge (3a, 4a) extending diagonally from one side surface (2a) toward the other side surface (2b) of the chip substrate (2). Each of the inner edges (3a, 4a) has a portion closer to the resistor film (5) that is electrically connected to a narrow portion (7, 8) formed integral with the resistor film (5). The narrow portion extends outward from an end (5a, 5b) of the resistor film (5).Type: GrantFiled: June 20, 2006Date of Patent: June 8, 2010Assignee: Rohm Co., Ltd.Inventor: Masaki Yoneda
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Publication number: 20090237200Abstract: A chip resistor (1) includes a chip substrate (2) a mutually separated terminal electrodes (3, 4) formed on the upper surface of the substrate (2), and a meandering resistor film (5) formed between the two terminal electrodes (3, 4). Each of the terminal electrodes (3, 4) includes an inner edge (3a, 4a) extending diagonally from one side surface (2a) toward the other side surface (2b) of the chip substrate (2). Each of the inner edges (3a, 4a) has a portion closer to the resistor film (5) that is electrically connected to a narrow portion (7, 8) formed integral with the resistor film (5). The narrow portion extends outward from an end (5a, 5b) of the resistor film (5).Type: ApplicationFiled: June 20, 2006Publication date: September 24, 2009Applicant: ROHM CO., LTD.Inventor: Masaki Yoneda
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Publication number: 20090040011Abstract: A chip resistor (1) according to the present invention includes an insulating substrate (2) which is in the form of an elongated rectangle in plan view, a pair of upper electrodes (3, 4) in the form of a strip formed on the upper surface of the insulating substrate (2) at portions adjacent to the long side surfaces of the insulating substrate to extend along the side surfaces, a resistor film (5) formed on the upper surface of the insulating substrate (2) and electrically connected to the upper electrodes (3, 4), and a pair of terminal electrodes (6, 7) formed on the two long side surfaces of the insulating substrate and electrically connected to the upper electrodes (3, 4), respectively. One of two longitudinal ends of the resistor film (5) is connected to one of the upper electrodes (3), whereas the other one of the two longitudinal ends of the resistor film is connected to the other one of the upper electrodes (4).Type: ApplicationFiled: October 10, 2006Publication date: February 12, 2009Applicant: ROHM CO., LTD.Inventor: Masaki Yoneda
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Patent number: 7394344Abstract: A chip resistor includes a chip substrate, a terminal electrode formed on an upper surface of the chip substrate in a region close to the respective end portions, and a resistant film formed in a zigzag-folded shape on the upper surface of the chip substrate between the terminal electrodes. An inner edge of at least one of the terminal electrodes includes a protrusion integrally formed so as to project from a portion close to a side edge of the chip substrate toward the resistant film, for achieving electrical connection between the resistant film and the protrusion. A side edge of the protrusion facing inward farther from the side edge of the chip substrate is inclined such that a front edge of the protrusion has a narrower width.Type: GrantFiled: February 28, 2005Date of Patent: July 1, 2008Assignee: Rohm Co., Ltd.Inventor: Masaki Yoneda
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Publication number: 20080129443Abstract: The chip resistor (1) includes an insulating substrate (2) and a main upper electrode (4) formed on a main surface of the insulating substrate (2). On the main surface of the insulating substrate (2) , a resistor film (5) including an end (5a) overlapping the upper surface of main upper electrode (4) is formed. The resistor film (5) is covered by a protective coat (7, 8). An auxiliary upper electrode (6) is formed on the upper surface of the main upper electrode (4). The auxiliary upper electrode (6) includes an inner end (6a) overlapping the upper surface of the end (5a) of the resistor film (5). The protective coat (7, 8) overlaps the inner end (6a) of the auxiliary upper electrode (6).Type: ApplicationFiled: February 28, 2006Publication date: June 5, 2008Applicant: ROHM CO., LTD.Inventors: Torayuki Tsukada, Masaki Yoneda
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Patent number: 7286039Abstract: A chip resistor is provided which includes a resistor film 5 formed between a pair of terminal electrodes 2 and 3 on an upper surface of an insulating substrate 2. The resistor film is formed with two inward grooves 7, 8 and two trimming grooves 9, 10 which are alternately provided for causing the current path in the resistor film to have a winding shape. The two inward grooves 7 and 8 are provided approximately at the midpoint between one end edge 5a and the other end edge 5b of the resistor film 5. The trimming groove 9 is provided between the inward groove 8 and the end edge 5a of the resistor film, whereas the other trimming groove 10 is provided between the inward groove 7 and the end edge 5b of the resistor film, whereby the time required for the trimming adjustment to adjust the resistance to a predetermined value is shortened, and the yield rate is reduced to reduce the cost.Type: GrantFiled: September 17, 2004Date of Patent: October 23, 2007Assignee: Rohm Co., Ltd.Inventor: Masaki Yoneda
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Publication number: 20070035379Abstract: A chip resistor is provided which includes a resistor film 5 formed between a pair of terminal electrodes 2 and 3 on an upper surface of an insulating substrate 2. The resistor film is formed with two inward grooves 7, 8 and two trimming grooves 9, 10 which are alternately provided for causing the current path in the resistor film to have a winding shape. The two inward grooves 7 and 8 are provided approximately at the midpoint between one end edge 5a and the other end edge 5b of the resistor film 5. The trimming groove 9 is provided between the inward groove 8 and the end edge 5a of the resistor film, whereas the other trimming groove 10 is provided between the inward groove 7 and the end edge 5b of the resistor film, whereby the time required for the trimming adjustment to adjust the resistance to a predetermined value is shortened, and the yield rate is reduced to reduce the cost.Type: ApplicationFiled: September 17, 2004Publication date: February 15, 2007Applicant: ROHM CO., LTD.Inventor: Masaki Yoneda
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Publication number: 20050275503Abstract: A chip resistor includes a chip substrate, a terminal electrode formed on an upper surface of the chip substrate in a region close to the respective end portions, and a resistant film formed in a zigzag-folded shape on the upper surface of the chip substrate between the terminal electrodes. An inner edge of at least one of the terminal electrodes includes a protrusion integrally formed so as to project from a portion close to a side edge of the chip substrate toward the resistant film, for achieving electrical connection between the resistant film and the protrusion. A side edge of the protrusion facing inward farther from the side edge of the chip substrate is inclined such that a front edge of the protrusion has a narrower width.Type: ApplicationFiled: February 28, 2005Publication date: December 15, 2005Applicant: ROHM CO., LTD.Inventor: Masaki Yoneda
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Patent number: 6492896Abstract: There are provided a pair of upper surface electrodes 21, 31 at both end sections, which are opposed to each other, of the insulating substrate 1 made of alumina. There is provided a resistor body 4 on the substrate 1 so that the upper surface electrode 21 and both the end sections can be electrically connected with each other. On the pair of upper surface electrodes 21, 31, there are provided a pair of upper surface auxiliary electrodes 24, 34 made of material, the heat-resistance with respect to solder of which is superior to that of the upper surface electrodes 21, 31, so that the exposed sections of the upper surface electrodes 21, 31 can be completely covered with the pair of upper surface auxiliary electrodes 24, 34, wherein the pair of upper surface auxiliary electrodes 24, 34 are not directly connected with the resistor body 4. On the surface of the resistor body 4, there is provided a protective film 5 (a first protective film 51 to a third protective film 53).Type: GrantFiled: July 9, 2001Date of Patent: December 10, 2002Assignee: Rohm Co., Ltd.Inventor: Masaki Yoneda
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Publication number: 20020003466Abstract: There are provided a pair of upper surface electrodes 21, 31 at both end sections, which are opposed to each other, of the insulating substrate 1 made of alumina. There is provided a resistor body 4 on the substrate 1 so that the upper surface electrode 21 and both the end sections can be electrically connected with each other. On the pair of upper surface electrodes 21, 31, there are provided a pair of upper surface auxiliary electrodes 24, 34 made of material, the heat-resistance with respect to solder of which is superior to that of the upper surface electrodes 21, 31, so that the exposed sections of the upper surface electrodes 21, 31 can be completely covered with the pair of upper surface auxiliary electrodes 24, 34, wherein the pair of upper surface auxiliary electrodes 24, 34 are not directly connected with the resistor body 4. On the surface of the resistor body 4, there is provided a protective film 5 (a first protective film 51 to a third protective film 53).Type: ApplicationFiled: July 9, 2001Publication date: January 10, 2002Applicant: ROHM CO., LTD.Inventor: Masaki Yoneda