Power-generating element, encoder, and method for producing magnetic member

A power generation element comprising:

• a magnetic member that produces a large Barkhausen effect by a change in an external magnetic field formed by a magnetic field generation source;
• a ferrite member enclosing the magnetic member, the ferrite member having a tubular shape;
• and
• a coil wound around the ferrite member.

A power generation element comprising:

• a magnetic member that produces a large Barkhausen effect by a change in an external magnetic field formed by a magnetic field generation source;
• a coil wound around the magnetic member;
• and
• a ferrite member provided at an end of the magnetic member, the ferrite member being aligned with the coil along a winding axis direction of the coil,
• wherein the ferrite member is a resin molded body containing at least one of a soft magnetic powder and a hard magnetic powder, and a resin.

A power generation element comprising:

• a magnetic member that produces a large Barkhausen effect by a change in an external magnetic field formed by a magnetic field generation source;
• and
• a coil wound around the magnetic member,
• wherein the coil includes an end that has an outer peripheral diameter smaller than an outer peripheral diameter of a central part of the coil in a winding axis direction of the coil.

A power generation element comprising:

• a magnetic member that produces a large Barkhausen effect by a change in an external magnetic field formed by a magnetic field generation source;
• a first coil wound around the magnetic member;
• and
• a second coil disposed on a side opposite to a side of the magnetic field generation source of the first coil, the second coil facing the first coil and wound along an axis parallel to a winding axis of the first coil.

A power generation element comprising:

• a magnetic member that generates a large Barkhausen effect by a change in an external magnetic field formed by a magnetic field generation source, the magnetic member having a plate shape;
• and
• a coil wound around the magnetic member,
• wherein
• the magnetic member includes a plurality of first magnetic sensitive layers and a plurality of second magnetic sensitive layers having harder magnetism than the plurality of first magnetic sensitive layers,
• the plurality of first magnetic sensitive layers and the plurality of second magnetic sensitive layers are alternately stacked along a direction intersecting a winding axis direction of the coil, and
• the plurality of first magnetic sensitive layers has a total thickness larger than a total thickness of the plurality of second magnetic sensitive layers.

A power generation element comprising:

• a magnetic member that produces a large Barkhausen effect by a change in an external magnetic field formed by a magnetic field generation source;
• and
• a coil wound around the magnetic member,
• wherein the magnetic member includes a composite magnetic wire having different magnetic characteristics between a central part and an outer peripheral part, and a covering layer covering an outer periphery of the composite magnetic wire and configured of a soft magnetic material.