JPS6443207A - Toothbrush - Google Patents

Abstract

PURPOSE: To obtain a toothbrush in which the electromotive force produced is large without restricting the life by embedding a piezoelectric element ranging from the holding handle part to the brush-bristle part, and by exposedly arranging different electrodes on the piezoelectric element in the brush-brittle planting part and in the holding handle part. CONSTITUTION: A piezoelectric element 4 of a material having a piezoelectric effect is embedded in the center of the handle 3 part between the holding handle part 1 and the brush bristle part 2. Both an electrode 7 on the brush bristle side viewing from the piezoelectric element 4 that has been exposed in the vicinity of the brush-bristle planting part 6 of brush bristles 5, and an electrode 8 that has been exposed in the holding handle part 1 to be taken out from the other pole of the piezoelectric element 4 are arranged. When the part of the handle 3 is bent, an electromotive force is produced in accordance with the expansion or contraction of the piezoelectric element 4, and a potential difference is caused between the electrode 7 on the brush bristle part that is exposed in the vicinity of the brush-bristle planting part 6 of brush bristles 5, and the electrode 8 that is exposed in the vicinity of the holding handle part 1 for taking out from the other pole of the piezoelectric element.