| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a toothbrush which has a high cleaning effect even when a neck part is thinned. <P>SOLUTION: The toothbrush 1 includes a head part 2 having a bristle bundle implanted, the neck part 4 provided in extension from the head part 2 and a handle part 6 provided in extension from the neck part 4, and the cross-sectional contour of the neck part 4 varies from the head part 2 toward the handle part 6. Herein the cross-sectional contour of the neck part 4 to the head part 2 is made almost round. This almost round cross-sectional contour becomes an almost square one which has sides formed on the surface, the back and lateral sides respectively, toward the handle part 6, and moreover, the almost square cross-sectional contour becomes an almost polygonal one having top portions positioned on both of the lateral sides and being flat in the direction of thickness, toward the handle part 6. <P>COPYRIGHT: (C)2013,JPO&INPIT |
