High frequency heating apparatus with temperature detection means

A high-frequency heating apparatus comprising:

• a mounting table on which to mount an object to be heated;
• rotation drive means to rotate said mounting table;
• temperature detection means to cover almost an entire area of said mounting table as a detection area by rotating said mounting table;
• radiation variation means to form variations in a high-frequency radiation intensity in a heating chamber;
• and
• control means to stop the rotation of said mounting table when a lowest temperature object comes to where the radiation is strong and heat the object while monitoring a surface temperature of the object by said temperature detection means,
• wherein said control means restarts to rotate said mounting table when present temperature data obtained from an object on heating shows a predetermined temperature rise from the lowest temperature,
• the predetermined temperature rise is determined based on temperature differentials between highest temperature and lowest temperature obtained from said temperature detection means before said mounting table stops to rotate,
• wherein said radiation means comprises a power feed portion for supplying a high-frequency power to said heating chamber accommodating the object and a rotating support on which to mount a mounting table, and wherein,
• a gap between a peripheral part of the rotating support and the power feed portion is equal to about ¼ a propagation wavelength of the high-frequency radiation in a waveguide that transmits the high-frequency radiation generated by a high-frequency radiation generation means to the power feed portion.

A high-frequency heating apparatus comprising:

• a power feed portion to supply a high-frequency power to a heating chamber;
• a mounting table to mount a plurality of objects to be heated thereon and apply more of the high-frequency power to the object located near the power feed portion than to objects located elsewhere;
• a temperature detection means to detect temperatures of the plurality of objects when said mounting table is rotating and, when said mounting table is stopped, monitor a temperature change of at least the object near the power feed portion;
• a decision means to determine a temperature difference between the objects being heated based on a detection result obtained from said temperature detection means when said mounting table is rotating;
• and
• a control means to stop the rotation of said mounting table when the lower-temperature object comes near the power feed portion according to a decision made by said decision means and to heat the object concentratedly and at the same time occasionally rotate said mounting table to check for a possible change of the lower-temperature object.

A high-frequency heating apparatus comprising:

• a heating chamber to accommodate objects to be heated;
• high-frequency radiation generation means to generate a high-frequency radiation;
• a power feed portion to supply the high-frequency radiation generated by said high-frequency radiation generation means to said heating chamber;
• a drive power supply to drive said high-frequency radiation generation means;
• a mounting table on which to mount the objects to be heated;
• a rotating support on which to mount said mounting table and to form variations in a high-frequency radiation intensity in said heating chamber in cooperation with the power feed portion;
• rotation drive means to drive said rotating support;
• temperature detection means to cover almost an entire area of said mounting table as a detection area as said mounting table rotates;
• and
• control means to control the operations of said drive power supply and said rotation drive means according to a temperature distribution of the objects as represented by a detection signal from said temperature detection means and utilize the variations in the high-frequency radiation intensity in heating a lower-temperature object with a strong high-frequency radiation and heating a higher-temperature object with a weak high-frequency radiation to heat the entire objects with high-frequency radiations to an appropriate temperature, wherein
• said control means controls said rotation drive means so that when the control means decides that a temperature difference between maximum and minimum temperatures in a temperature distribution of the objects as represented by the detection signal from said temperature detection means exceeds a predetermined value, the minimum temperature object is brought to a position facing the power feed portion where the high-frequency radiation is strong before stopping the rotation of said mounting table, and that when a predetermined stop reset condition is met, said mounting table is rotated again.

A high frequency heating apparatus comprising:

• a mounting table on which to mount an object to be heated;
• rotation drive means to rotate said mounting table;
• temperature detection means to cover almost an entire area of said mounting table as a detection area by rotating said mounting table;
• radiation variation means to form variations in a high frequency radiation intensity in a heating chamber;
• and
• control means to stop the rotation of said mounting table when a lowest temperature object comes to where the radiation is strong and heat the object while monitoring a surface temperature of the object by said temperature detection means,
• wherein said control means restarts to rotate said mounting table when present temperature data obtained from an object on heating shows a predetermined temperature rise from the lowest temperature,
• the predetermined temperature rise is determined based on highest temperature and lowest temperature obtained from said temperature detection means before said mounting table stops to rotate.