# US 7,746,207 B2 · Coil device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,746,207 B2 - Document ID: US7746207B2 - Status: Granted - Kind: B2 - Application number: 10/571,771 - Filed: 2004-11-05 - Published: 2007-03-01 - Granted: 2010-06-29 - Earliest claimed: 2003-11-05 - Assignees: TDK Corporation - Inventors: Mitsuhiro Yamashita; Takashi Nagasaka; Hideki Miura; Yasuhiro Matsukawa; Kazuo Sato; Akira Sato; Hironori Sato; Takayuki Ito; Yasuhiko Kitajima - Web page: https://patentgrep.com/patent/US7746207B2 ## CPC - H01F 27/292: {Surface mounted devices} - H01F 17/045: {with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core} - H01F 41/082: Devices for guiding or positioning the winding material on the former - H01F 27/027: {specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards} - H01F 27/33: Arrangements for noise damping - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A coil apparatus having a divided winding conformation and a manufacturing method of the coil apparatus which can prevent a winding from collapsing while achieving a reduction in size of a core and simplification of a structure. A coil apparatus includes a ferrite core and a coil provided around the core. The coil includes at least a first coil portion and a second coil portion, and a boundary end surface of the first coil portion on the second coil portion side is inclined in such a manner that its inner peripheral side is closer to the second coil portion than its outer peripheral side. Further, a boundary end surface of the second coil portion on the first coil portion side is inclined in such a manner that its outer peripheral side is closer to the first coil portion than its inner peripheral side. ## Claims ### Claim 1 A coil apparatus comprising: a core; a coil provided around the core, the coil including at least a first coil portion and a second coil portion; and terminals, wherein a boundary end surface of the first coil portion on a second coil portion side is inclined in such a manner that an inner peripheral side of the boundary end surface of the first coil portion is closer to the second coil portion than an outer peripheral side of the boundary end surface of the first coil portion, the core has terminal attachment portions at opposing both ends thereof and has a winding portion in an intermediate portion thereof, the coil is formed of a winding wound around the winding portion, the terminal is a part to which an end of the winding is connected, formed of one metal sheet, and includes an attachment portion, an intermediate portion, and a bottom portion, one end of the attachment portion is fixed to the terminal attachment portion of the core, one end of the intermediate portion is continuous with the other end of the attachment portion at a bent portion, the bottom portion has one end which is continuous with the other end of the intermediate portion at a bent portion, faces the attachment portion, and has the other end as a free end, and the intermediate portion has a hole in a plane thereof, and both inner edges of the hole which face each other in at least one direction have an arc shape. ### Claim 2 (depends on 1) The coil apparatus according to claim 1, wherein the hole is arranged to be biased in a direction of the attachment portion. ### Claim 3 (depends on 1) The coil apparatus according to claim 1, wherein the terminal has en extended width portion in which a width is extended from the intermediate portion toward the bottom portion between the intermediate portion and the bottom portion. ### Claim 4 (depends on 1) The coil apparatus according to claim 1, wherein the hole has a circular shape. ### Claim 5 (depends on 1) The coil apparatus according to claim 1, wherein the hole has a short diameter and a long diameter, and a direction of the short diameter matches with a direction from the attachment portion to the bottom portion. ### Claim 6 (depends on 1) The coil apparatus according to claim 1, wherein the hole has a short diameter and a long diameter, and a direction of the long diameter matches with a direction from the attachment portion to the bottom portion. ### Claim 7 (depends on 5) The coil apparatus according to claim 5, wherein arc-shaped parts at both ends of the hole are continuous with each other through linear parts. ### Claim 8 (depends on 6) The coil apparatus according to claim 6, wherein arc-shaped parts at both ends of the hole are continuous with each other through linear parts. ### Claim 9 (depends on 5) The coil apparatus according to claim 5, wherein the hole has an elliptic shape. ### Claim 10 (depends on 6) The coil apparatus according to claim 6, wherein the hole has an elliptic shape. ### Claim 11 A coil apparatus comprising: a core; a coil provided around the core, the coil including at least a first coil portion and a second coil portion; and an insulating sheath body which covers the core and the coil, wherein a boundary end surface of the first coil portion on a second coil portion side is inclined in such a manner that an inner peripheral side of the boundary end surface of the first coil portion is closer to the second coil portion than an outer peripheral side of the boundary end surface of the first coil portion, the core includes a winding core portion around which the winding of the coil is wound and a pair of flange portions formed at both ends of the winding core portion, and a cross section of the winding core portion orthogonal to a coil winding axis direction has a shape which includes bulge portions on a pair of opposing surfaces in a square shape. ### Claim 12 (depends on 11) The coil apparatus according to claim 11, wherein the bulge portion of the winding core portion is formed of a curved line in the cross section orthogonal to the coil winding axis direction. ### Claim 13 (depends on 11) The coil apparatus according to claim 11, wherein at least one winding escape portion is formed in the winding core portion, the winding escape portion is formed by being inwardly depressed apart from an arc line which is in contact with the bulge portion and connects the square angular portions on both sides of the bulge portion as seen in a lateral cross section of the winding core portion. ### Claim 14 (depends on 12) The coil apparatus according to claim 12, wherein at least one winding escape portion is formed in the winding core portion, the winding escape portion is formed by being inwardly depressed apart from an arc line which is in contact with the bulge portion and connects the square angular portions on both sides of the bulge portion as seen in a lateral cross section of the winding core portion. ### Claim 15 (depends on 11) The coil apparatus according to claim 11, wherein the winding core portion has flat portions on both sides of each of the bulge portions, and the flat portions are formed between the other pair of opposing surfaces in the square shape and the bulge portions. ### Claim 16 (depends on 11) The coil apparatus according to claim 11, wherein a part between an outer peripheral surface of the winding core portion and a surface of the flange portion on the winding core portion side is subjected to R processing or taper machining. ### Claim 17 (depends on 11) The coil apparatus according to claim 11, wherein a part between a surface on the winding core portion side and an outer peripheral surface on a radial outer side in the flange portion is subjected to R processing.