RADIO WAVE LEAKAGE PREVENTIVE STRUCTURE FOR HIGH FREQUENCY HEATER

PURPOSE:To obtain a radio wave leakage preventing structure in which a radio wave leakage can be satisfactorily prevented and a door of a high frequency heater can be reduced in size. CONSTITUTION:A choke groove 30 has an inner wall 34, a bottom 36, an outer wall 35 and an opening 37. An upper part 38 of the wall 34 is connected to a door central plate 25. Slits 39 having periodicity are formed at the wall 35. A sealing plate 32 is provided in the opening 37 of the groove 30. The plate 32 has a step 40 raised from the wall 34 of the groove 30 inward of the door, an extended part 41 extended from an upper end of the step 40, and a bent part 42 bent in the groove 30 from the end of the extended part. An auxiliary groove 43 of a size to be decided by the step 40, the parts, 41, 42 and the part 38 is formed. The groove 43 is for varying a central frequency of a radio wave attenuating range of the groove 30 within a predetermined range.