Dielectric heating device
A dielectric heating device includes a first electrode and a second electrode that face an object to be heated and to which an AC voltage is applied, and a coil that is electrically coupled in series to the first electrode. A linear distance between one end and the other end of the coil is equal to or smaller than a linear distance between the one end and a central portion of the coil in a magnetic path direction of the coil.
1 . A dielectric heating device comprising:
a first electrode and a second electrode that face an object to be heated and to which an AC voltage is applied; and
a coil that is electrically coupled in series to the first electrode, wherein
a linear distance between one end and another end of the coil is equal to or smaller than a linear distance between the one end and a central portion of the coil in a magnetic path direction of the coil,
the first electrode is in an oval shape and extends along a first direction in a plan view, and a bottom of the first electrode has a curved convex surface, and
the second electrode is in an oval-ring shape and surrounds the first electrode in the plan view.
2 . The dielectric heating device according to claim 1 , wherein
the coil is formed in an annular shape such that an annular magnetic path is formed in the coil.
3 . The dielectric heating device according to claim 1 , wherein
the coil is covered with the first electrode when projected onto a plane perpendicular to a direction in which the object to be heated and the first electrode face each other.
4 . The dielectric heating device according to claim 1 , wherein
a linear distance between the first electrode and the one end of the coil is equal to or smaller than a linear distance between the first electrode and the central portion of the coil.
5 . The dielectric heating device according to claim 1 , wherein
the coil includes a core.
6 . The dielectric heating device according to claim 5 , wherein
the core is made of resin or ceramics.
7 . The dielectric heating device according to claim 5 , wherein
the core has a hollow portion along the magnetic path direction.