PROBLEM TO BE SOLVED: To provide a waveform generator having efficacy for the deep muscle and reducing uncomfortable feeling of stimulation.SOLUTION: The waveform generator repetitively outputs a positive electrode pulse train group and an idle period continued from the positive pulse train group, and a negative electrode pulse train group and an idle period continued from the negative pulse train group alternately with time course. When an output time of the pulse train groups is defined as a pulse train group output time, and a total time of the pulse train group output time and the idle period is defined as a pulse slow/quick time, within a range where the pulse train group output time becomes shorter than the pulse slow/quick time, the waveform generator repetitively changes the pulse frequency of the pulse train group, with the time course, to a third frequency lower than the second frequency within a predetermined first frequency and a second frequency lower than the first frequency. Further, the wave generator changes the pulse train group output time with the time course in synchronization with the third frequency, with respect to the first time width, in a case of the first frequency, to a time width obtained by multiplying the first time width by a numerical value 1, and in a case of a second frequency, to a second time width obtained by multiplying the first time width by a second contraction rate.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2018,JPO&INPIT【課題】深層筋に効果があり、不快な刺激感を低減した波形発生装置を提供する。【解決手段】正極パルス列群と正極パルス列群に続く休止期間、および、負極パルス列群と負極パルス列群に続く休止期間、とを、時間経過に従って交互に繰り返し出力する波形発生装置において、パルス列群の出力時間をパルス列群出力時間、パルス列群出力時間と休止期間との合計時間をパルス緩急時間とし、パルス列群出力時間がパルス緩急時間より短くなる範囲で、パルス列群のパルス周波数を、あらかじめ定めた第1の周波数と第1の周波数より低い第2の周波数との範囲で時間経過に従って第2の周波数より低い第3の周波数で繰り返し変化させ、かつ、パルス列群出力時間を、あらかじめ定めた第1の時間幅に対し、第1の周波数のときに数値の1を乗じた時間幅とし、第2の周波数のときに第2の短縮率を乗じた第2の時間幅として、第3の周波数に同期して時間経過に従って変化させる。【選択図】図4
