# US 10,483,013 B2 · Insulated wire excellent in bending resistance, as well as coil and electric or electronic equipment using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,483,013 B2 - Document ID: US10483013B2 - Status: Granted - Kind: B2 - Application number: 15/632,026 - Filed: 2017-06-23 - Published: 2017-10-12 - Granted: 2019-11-19 - Earliest claimed: 2014-12-26 - Assignees: Furukawa Electric Co., Ltd.; Furukawa Magnet Wire Co., Ltd. - Applicants: Furukawa Electric Co., Ltd.; Furukawa Magnet Wire Co., Ltd. - Inventors: Makoto Oya; Tsuneo Aoi - Web page: https://patentgrep.com/patent/US10483013B2 ## CPC - H01B 7/02: Disposition of insulation - H01B 3/307: {Other macromolecular compounds} - H01B 3/308: {Wires with resins} - H01B 3/427: {Polyethers} - H01B 7/00: Insulated conductors or cables characterised by their form - H01F 5/06: Insulation of windings - H02K 3/30: Windings characterised by the insulating material - H01B 3/30: plastics; resins; waxes - H01B 3/42: polyesters; polyethers; polyacetals - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract An insulated wire having an insulating coat layer on the conductor outer peripheral surface having a rectangular cross-sectional shape and also having a long side, a short side, and a corner portion with a curvature radius Rc, wherein a thickness t1 of the insulating coat layer covered on the surface, and which layer includes a long side, a thickness t2 of the insulating coat layer covered on the surface, and which layer includes a short side, and a corner portion thickness t3 of the insulating coat layer satisfy formula (1): t3/{(t1+t2)/2}≥1.2 Formula (1) wherein the t1 and t2 are each independently from 20 μm to 50 μm, and wherein a ratio of the conductor cross-sectional area Sc to the insulated wire cross-sectional area Sw satisfies formula (2) 1.0>Sc/Sw≥0.8; Formula (2) as well as a coil and an electric or electronic equipment using the same. ## Claims ### Claim 1 An insulated wire having an insulating coat layer comprising a thermoplastic resin on an outer peripheral surface of a conductor having a rectangular cross-sectional shape and also having a long side, a short side, and a corner portion having a curvature radius Rc, wherein a thickness t1 (μm) of the insulating coat layer covered on a surface which is continuing in an axial direction of the conductor, and which layer includes a long side of a transverse section of the conductor, a thickness t2 (μm) of the insulating coat layer covered on the surface which is continuing in the axial direction of the conductor, and which layer includes a short side of the transverse section of the conductor, and a corner portion thickness t3 (μm) of the insulating coat layer satisfy formula (1): t3/{(t1+t2)/2}≥1.2 Formula (1) wherein the t1 (μm) and t2 (μm) are each independently 20 μm or more and 50 μm or less, and wherein a ratio of a cross-sectional area Sc (mm2) of the conductor to a cross-sectional area Sw (mm2) of the insulated wire satisfies formula (2): 1.0>Sc/Sw≥0.8. Formula (2) ### Claim 2 (depends on 1) The insulated wire according to claim 1, wherein a long side length c1 (mm) of the transverse section of the conductor is 4.5 mm or less, a short side length c2 (mm) of the transverse section of the conductor is 3.5 mm or less, and a curvature radius Re (mm) of the transverse section of the conductor is 0.60 mm or less, and wherein a combination of t1 (μm) and c2 (mm) or a combination of t2 (μm) and c1 (mm) each satisfy formula (3a) or (3b): 0