For example, as illustrated in FIG. 12, the protrusion portion 62 protruding in both upper and lower directions in the first boundary portion P1a may form the matching structure P11 with the upper width W1 and the lower width W2 of the recessed holding portion RH. For example, a groove shape that is complementary with the shape of the protrusion portion 62 may be formed in each of the upper width W1 and the lower width W2 so as to bury the protrusion portion 62. Also, as illustrated in FIG. 13, the concave-convex pattern 63 upwardly formed in the first boundary portion P1a may form the matching structure P11 with the upper width W1 of the recessed holding portion RH. For example, a complementary wedge shape with respect to the concave-convex pattern 63 may be formed in the upper width W1 so as to form an inclined interface with the concave-convex pattern 63. As illustrated in FIG. 9, the hole 61 formed in the first boundary portion P1a may be filled with a bump shape extending from the upper width W1 and the lower width W2 of the recessed holding portion RH. The bump shape extending from the upper width W1 and the lower width W2 of the recessed holding portion RH may fill the hole 61 of the first boundary portion P1a and may form the matching structure P11.
Hereinafter, the matching structure P11 between the first plate P1 and the main housing H is described in more detail.
