A flexible circuit board includes a substrate and a circuit unit formed on the substrate. The substrate has two carrying segments and a connecting segment, and the two carrying segments are connected by the connecting segment. The circuit unit has a plurality of conductive lines and at least one connecting line, and each conductive line and the connecting line are separated from each other. The conductive lines are respectively formed on the two carrying segments, and the connecting line is formed on the connecting segment and the two carrying segments. Two opposite ends of each carrying segment are configured to connect with each other to form a tubular structure, and two opposite ends of the connecting line are configured to connect to two adjacent conductive lines respectively formed on the two tubular structures, thereby the circuit unit is formed as a coil.

An embedded device 105 is assembled within a flexible circuit assembly 30 with the embedded device mid-plane intentionally located in proximity to the flexible circuit assembly central plane 115 to minimize stress effects on the embedded device. The opening 18, for the embedded device, is enlarged in an intermediate layer 10 to enhance flexibility of the flexible circuit assembly.

An embedded device 105 is assembled within a flexible circuit assembly 30 with the embedded device mid-plane intentionally located in proximity to the flexible circuit assembly central plane 115 to minimize stress effects on the embedded device. The opening 18, for the embedded device, is enlarged in an intermediate layer 10 to enhance flexibility of the flexible circuit assembly.

A flexible printed circuit board according to an embodiment of the present invention includes at least one insulating layer having flexibility and containing a synthetic resin as a main component; and at least one conducting layer including a circuit pattern, wherein the circuit pattern includes a continuous spiral pattern, and the flexible printed circuit board includes a curved portion that curves such that one side and another side of the spiral pattern are disposed close to each other.

An inductor bridge is configured to bridge-connect a first circuit and a second circuit to each other, and includes a flexible flat plate base body, a first connector at a first end portion of the base body and connected to the first circuit, a second connector at a second end portion of the base body and connected to the second circuit, and an inductor section in the base body between the first connector and the second connector. The inductor section includes conductor patterns including a plurality of layers. The inductor bridge further includes a bending portion between the inductor section and the first connector, and a slot at an inner side of the bending portion that reduces a thickness of the base body.

An inductor bridge is provided with a flexible flat plate-shaped element body, a first connector, and a second connector. The element body includes therein an inductor portion. The inductor portion is configured by a spiral conductor pattern. The first connector is provided on the element body and is connected to a first circuit. The second connector is provided on the element body and is connected to a second circuit.

An inductor bridge is configured to bridge-connect a first circuit and a second circuit to each other, and includes a flexible flat plate base body, a first connector at a first end portion of the base body and connected to the first circuit, a second connector at a second end portion of the base body and connected to the second circuit, and an inductor section in the base body between the first connector and the second connector. The inductor section includes conductor patterns including a plurality of layers. The inductor bridge further includes a bending portion between the inductor section and the first connector, and a slot at an inner side of the bending portion that reduces a thickness of the base body.

A position sensor includes a flexible substrate formed into a three-dimensional (3D) shape. At least first and second field-sensing coils are formed in first and second respective layers of the flexible substrate, such that in the 3D shape the first and second field-sensing coils have first and second respective axes that are not parallel to one another.

A position sensor includes a flexible substrate formed into a three-dimensional (3D) shape. At least first and second field-sensing coils are formed in first and second respective layers of the flexible substrate, such that in the 3D shape the first and second field-sensing coils have first and second respective axes that are not parallel to one another.

A coil substrate includes a flexible substrate having a first surface and a second surface on the opposite side with respect to the first surface, a coil including a wiring and formed on the first surface and/or second surface of the flexible substrate, and a resin insulating layer covering the wiring of the coil formed on the first surface and/or second surface of the flexible substrate. The coil is formed such that the wiring has a first layer and a second layer covering an outer surface of the first layer and that the second layer has a first portion covering an upper surface of the first layer and a second portion covering a side surface of the first layer, and the wiring of the coil is formed such that the wiring has a width in a range of 60 m to 400 m and that a ratio T1/T2 of a thickness T1 of the first portion to a thickness T2 of the second portion satisfies 1.0<T1/T21.4.