| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration of optical performance occurred when a lens barrel is extended.SOLUTION: A lens barrel includes: a fixture barrel; an operation ring that is rotatively operated along a peripheral surface of the fixture barrel, and has one of a plurality of grooves and a plurality of protrusions arranged at an inner periphery thereof; a rectilinear advancing barrel that has a rotation restricted with respect to the fixture barrel, has the other of the plurality of grooves and the plurality of protrusions of the operation ring fit to the one thereof and rectilinearly advances with respect to the fixture barrel when the operation ring is rotatively operated; a rotary barrel that rotates integrally with the operation ring and rectilinearly advances integrally with the rectilinear advancing barrel; and a support part that has a rotation restricted to one of the rectilinear advancing barrel and the rotary barrel, rectilinearly advances to the rectilinear advancing barrel and the rotary barrel by receiving a driving force from the other of the rectilinear advancing barrel and the rotary barrel and supports an optical member. |
