| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a toothbrush having a handle formed of a primary molded portion and a secondary molded portion which are formed by two-color molding, and preventing the secondary molded portion from separating from the primary molded portion. <P>SOLUTION: The toothbrush includes a head, a neck extended to the head, a handle extended to the neck. The handle has the primary molded portion 30 formed of a first resin and having a polygonal pillar shape, and the secondary molded portion 32 formed of a second resin different from the first resin, and formed on at least one side surface of the primary molded portion 30 in a manner to be substantially flush with the side surface. In the primary molded portion 30, an interior angle θ between a first side surface 30a formed with the secondary molded portion 32 and a second side surface 30b adjacent to the first side surface 30a is not smaller than 90° and not larger than 150°, and the edge width L from the intersection point P of a tangential line T<SB POS="POST">1</SB>extending in a width direction of the first side surface 30a and a tangential line T<SB POS="POST">2</SB>extending in a width direction of the second side surface 30b to the secondary molded portion 32 is not shorter than 0.5 mm and not longer than 1.5 mm. <P>COPYRIGHT: (C)2013,JPO&INPIT |
