High-frequency heating device

Claim 2

A high-frequency heating device comprising: a housing; a heating chamber housed in said housing, said heating chamber having an opening therein; a high-frequency generator; means for transmitting high-frequency energy from said generator to said opening in said heating chamber; a rotating disk guiding the energy mounted for rotation within said opening, said disk having a base plate made of a low dielectric loss material and a plurality of high-frequency screening pieces arranged on the base plate and defining high-frequency exciting slots between the screening pieces which extend radially from the central axis of the base plate to the outer circumference thereof so that a distribution of high frequency energy across said opening has a maximum value at a central axis of said opening and is supplied therethrough to said heating chamber; means for spacing said screening pieces a predetermined distance from said base plate; and driving means for rotating said rotating disk.

Claim 3

A high-frequency heating device according to claim 1 wherein the opening is provided in a roof portion of said heating chamber, the rotating disk is arranged to substantially cover the opening, and the high-frequency energy transmitting means is arranged on the roof portion of the heating chamber and has a waveguide structure opposite to the opening.

Claim 4

A high-frequency heating device according to claim 2 wherein the hole is circular and the rotating disk is concentrically arranged in the circle of the circular hole.

Claim 5

A high-frequency heating device according to claim 1 wherein the exciting slot has a plurality of slits extending radially from the center axis to the outer circumference of the base plate and through which the upper surface of the base plate is exposed.

Claim 6

A high-frequency heating device according to claim 1 wherein the high-frequency screening pieces are fan-shaped metal plates arranged symmetrically around the center axis of the base plate and each of the slits is defined by the adjacent sides of the metal plates.

Claim 7

A high-frequency heating device according to claim 1 wherein the corners of the screening piece are separated from the upper surface of the base plate by more than 0.5 mm.

Claim 8

A hgh-frequency heating device according to claim 1 or 6 wherein said separating means comprises projections located between said screening pieces and base plate.

Claim 9

A high-frequency heating device according to claim 7 wherein the projections are integrally formed with the base plate.

Claim 10

A high-frequency heating device according to claim 1 or 6 wherein the base plate has a plurality of holes thereon and the screening plate is positioned on the base plate with a corner facing a hole.

Claim 11

A high-frequency heating device comprising: a housing; a heating chamber housed in said housing, said heating chamber having an opening therein; a high-frequency generator; means for transmitting high-frequency energy from said generator to said opening in said heating chamber; a rotating disk guiding the energy mounted for rotation within said opening, said disk having a base plate made of a low dielectric loss material and a plurality of high-frequency screening pieces arranged on the base plate and defining high-frequency exciting slots between the screening pieces which extend radially from the central axis of the base plate to the outer circumference thereof so that a distribution of high frequency energy across said opening has a maximum value at a central axis of said opening and is supplied therethrough to said heating chamber; means for preventing a portion of the screening pieces from being excessively heated for the high-frequency energy; and driving means for rotating said rotating disk.

Claim 12

A high-frequency heating device comprising: a housing; a heating chamber housed in said housing, said heating chamber having an opening therein; a high-frequency generator; means for transmitting high-frequency energy from said generator to said opening in said heating chamber; a rotating disk guiding the energy mounted for rotation within said opening, said disk having a base plate made of a low dielectric loss material and a plurality of high-frequency screening pieces arranged on the base plate and defining high-frequency exciting slots between the screening pieces which extend radially from the central axis of the base plate to the outer circumference thereof so that a distribution of high frequency energy across said opening has a maximum value at a central axis of said opening and is supplied therethrough to said heating chamber; means for preventing a portion of the screening pieces from being excessively heated for the high-frequency energy; and driving means for rotating said rotating disk.