Patent ID: 8405922
Filing Date: 2013-03-26
Classification: G02B,G03B,H04N

Abstract:
1. A lens barrel including a plurality of lens groups which are shifted to be in a shooting state in which at least a part of the lens groups is moved in an optical axis direction and in a collapsed state in which the lens groups are accommodated in a camera body by collapsing at least a part of the lens groups, the lens barrel comprising: the plurality of lens groups including a first lens group and a second lens group positioned closer to an imaging plane than the first lens group; a plurality of lens group frames including first and second lens group frames holding the first and second lens groups, respectively; a rotary cylinder configured to engage with the first lens group frame via a cam groove and surround the first lens group frame and be rotated around an optical axis so as to move the first lens group in the optical axis direction; a rotation transmission system configured to transmit a rotary force of the rotary cylinder; and a second frame driver provided inside of the first lens group frame and configured to engage with the second lens group frame via a cam groove so as to move the second lens group in the optical axis direction relative to the first lens group frame by the rotary force of the rotary cylinder transmitted via the rotation transmission system, wherein: the second frame driver comprises a rotary frame configured to engage with the second lens group frame via a cam groove, and surround the second lens group frame and be rotated around the optical axis, and the rotation transmission system comprises an inner wall groove in an inner wall of the rotary cylinder, a gear engaging with the inner wall groove, and an outer wall groove in an outer wall of the rotary cylinder to engage with the gear.