Patent ID: 7212357
Filing Date: 2007-05-01
Classification: G02B

Abstract:
1. A positioning structure comprising two parts to be attached to each other, wherein one of the two parts has an attaching surface having a positioning projection, the other of the two parts has an attaching surface having a positioning hole, and the two parts are positioned by fitting the positioning projection and the positioning hole when the two parts are attached to each other, wherein one of the two parts comprises a resin material and is formed by means of metallic molding, and the attaching surface of the one of the two parts is inclined within an acute angle with respect to a direction orthogonal to an opening and closing direction of a mold for forming the attaching surface; the positioning projection or hole on the attaching surface is formed simultaneously by the metallic molding, and the positioning projection or hole has an outer or inner surface coming into contact with the positioning hole or projection of the other of the two parts, the outer or inner surface having a side surface with a rotationally symmetric trapezoid section having tapered side surfaces inclined within an acute angle with respect to a perpendicular to the attaching surface; and the positioning structure satisfies formula: wherein α represents an angle of inclination of the attaching surface with respect to the direction orthogonal to the opening and closing direction of the mold is defined, and β represents an angle of inclination of the tapered surface with respect to the direction orthogonal to the opening and closing direction of the mold.