# US 2017/0288464 A1 · Power Transmission Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0288464 A1 - Document ID: US20170288464A1 - Status: Published application - Kind: A1 - Application number: 15/471,345 - Filed: 2017-03-28 - Published: 2017-10-05 - Earliest claimed: 2016-03-30 - Assignees: TDK Corporation - Applicants: TDK Corporation - Inventors: Kazuyoshi HANABUSA; Masayuki KOBAYASHI; Takeshi KAMONO - Web page: https://patentgrep.com/patent/US20170288464A1 ## CPC - H02J 50/12: of the resonant type - H01F 27/2885: {with shields or electrodes (shields or electrodes for pancake coils H01F27/2871; construction of electric or magnetic shields or screens H01F27/36)} - H01F 27/346: {Preventing or reducing leakage fields (using magnetic shields H01F27/36; using auxiliary windings H01F27/38)} - H01F 38/14: Inductive couplings - H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields - H02J 50/90: involving detection or optimisation of position, e.g. alignment - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A power transmission device, which is used for a contactless power transmission to a movable body moving on a travelling surface in a power transmission direction parallel to the travelling surface, including a power transmission coil and a shielding plate, wherein, the power transmission coil is installed so that a coil surface is approximately vertical to the travelling surface, and at least a part of the shielding plate is disposed inside the region on the travelling surface sandwiched between a plane surface defined by a coil surface of the power transmission coil and a plane surface defined by a coil surface of a power receiving coil mounted on the movable body. ## Claims ### Claim 1 A power transmission device, which is used for a contactless power transmission to a movable body moving on a travelling surface in a power transmission direction parallel to the travelling surface, comprising a power transmission coil and a shielding plate, wherein, the power transmission coil is installed so that a coil surface is approximately vertical to the travelling surface, and at least a part of the shielding plate is disposed inside the region on the travelling surface sandwiched between a plane surface defined by a coil surface of the power transmission coil and a plane surface defined by a coil surface of a power receiving coil mounted on the movable body. ### Claim 2 (depends on 1) The power transmission device of claim 1, wherein, the shielding plate is disposed to improve the power transmission efficiency from the power transmission coil to the power receiving coil. ### Claim 3 (depends on 1) The power transmission device of claim 1, wherein, the power transmission coil is disposed so that an installation height is shorter than a length of the coil outer shape in a direction approximately vertical to the travelling surface, wherein the installation height is a distance from a coil outer edge to the travelling surface. ### Claim 4 (depends on 2) The power transmission device of claim 2, wherein, the power transmission coil is disposed so that an installation height is shorter than a length of the coil outer shape in a direction approximately vertical to the travelling surface, wherein the installation height is a distance from a coil outer edge to the travelling surface. ### Claim 5 (depends on 3) The power transmission device of claim 3, wherein, a length from the plane surface defined by the coil surface of the power transmission coil to an end portion of the power receiving coil side of the shielding plate is set to be longer than the installation height. ### Claim 6 (depends on 4) The power transmission device of claim 4, wherein, a length from the plane surface defined by the coil surface of the power transmission coil to an end portion of the power receiving coil side of the shielding plate is set to be longer than the installation height. ### Claim 7 (depends on 1) The power transmission device of claim 1, wherein, an upper surface of the shielding plate is disposed to be approximately in the same plane as the travelling surface. ### Claim 8 (depends on 2) The power transmission device of claim 2, wherein, an upper surface of the shielding plate is disposed to be approximately in the same plane as the travelling surface. ### Claim 9 (depends on 3) The power transmission device of claim 3, wherein, an upper surface of the shielding plate is disposed to be approximately in the same plane as the travelling surface. ### Claim 10 (depends on 4) The power transmission device of claim 4, wherein, an upper surface of the shielding plate is disposed to be approximately in the same plane as the travelling surface. ### Claim 11 (depends on 5) The power transmission device of claim 5, wherein, an upper surface of the shielding plate is disposed to be approximately in the same plane as the travelling surface. ### Claim 12 (depends on 6) The power transmission device of claim 6, wherein, an upper surface of the shielding plate is disposed to be approximately in the same plane as the travelling surface. ### Claim 13 A power transmission device, which is used for a contactless power transmission in a horizontal direction, comprising a power transmission coil and a shielding plate, wherein, the power transmission coil is installed so that a winding axis direction is approximately parallel to the horizontal direction, the shielding plate has a main face extending along the horizontal direction, and at least a part of the shielding plate is disposed inside the region located in the vertical lower part of the space sandwiched between a plane surface defined by a coil surface of the power transmission coil and a plane surface defined by a coil surface of a power receiving coil opposite to the power transmission coil.