| 摘要 |
In a retractable lens barrel, during imaging, when a drive unit is driven accompanying the extension of the retractable lens barrel, a first lens and a second lens are moved along the optical axis to maintain a given interval between the first lens and the second lens, a rotating member rotates in a given direction and rotates centered about a line parallel to the optical axis, whereby a first optical element is inserted onto the optical axis. The second lens is moved such that a second optical element remains positioned on the optical axis. In this state, the entrance of outside light, which can cause image formation to be negatively affected, is prevented by the rotating member and a base member. Thus, light entering the inside of the retractable lens barrel is limited to the light transmitted by the first optical element and necessary for image formation. |
