| 摘要 |
<p>The purpose of the present invention is to provide a lens barrel which is durable against an external force such as being dropped and can be made compact. A lens barrel (20) has a cylindrical first straight moving frame (110), a cylindrical first rotational frame (210) and a cylindrical second straight moving frame (120). The first rotational frame (210) has: a bayonet projection (E0) formed along the circumference on the outer peripheral surface (210T) thereof; and a cam groove (b2) that passes through a first rotational frame body (211) from an inner peripheral surface (210S) to an outer peripheral surface (210T) and intersects with the bayonet projection (E0). The cam groove (b2) has a groove section (b2st) formed along the circumference. A rear side surface (218) opposite the subject for a bayonet groove (e0) is substantially at the same position in front-back direction as the rear side surface (214) opposite the subject for the groove section (b2st).</p> |
