CYLINDRICAL MOLDED ARTICLE, LENS BARREL, CAMERA, AND INJECTION MOLD

摘要

A drive frame 34 serving as a cylindrical molded article includes a drive frame main body 34 a, three first cam grooves 34 c, three second cam grooves 34 d, three first gate portions 84 b, and three high-density regions H. The first gate portions are formed at the end of the cylindrical portion, and are vestiges of gates in injection molding. The high-density regions H are regions in which there is the highest proportion of the axial direction dimension accounted for by the first cam grooves 34 c and the second cam grooves 34 d with respect to the axial direction dimension of the drive frame main body 34 a. The first gate portions 84 b are disposed at a location closer to one of two adjacent high-density regions than the other in the circumferential direction of the two adjacent high-density regions H.