Patent ID: 8564894

Claim:
A lens barrel, comprising: an imaging optical system, including: a moving lens group comprising one or more lenses that are fixed together by a holding frame, the moving lens group being movable in a direction of an optical axis, a first aperture in an aperture structure for limiting light admitted to the imaging optical system, the first aperture being disposed on an object side of the moving lens group and being a smallest opening in the aperture structure, and a second aperture disposed on an image plane side of the moving lens group; a first optical path regulating section being separated from the aperture structure and extending from a main barrel, the first optical path regulating section being formed on an image plane side of the first aperture, wherein a height between an inner edge in a radial direction of the first optical path regulating section and the optical axis is smaller than an aperture radius of the first aperture and is larger than a radius of an outermost imaging light flux of the imaging optical system at a same position as the first optical path regulating section in a direction of the optical axis; and a second optical path regulating section integrally formed with the holding frame, wherein a height between an outer edge in the radial direction of the second optical path regulating section and the optical axis is smaller than the aperture radius of the first aperture and is larger than the height between the inner edge of the first optical path regulating section and the optical axis.