LENS BARREL

To achieve a lens barrel that enables a simple configuration to suppress dew condensation in a short time without providing dedicated air ventilation means.SOLUTION: A lens barrel has: a plurality of lens groups; a driving mechanism that is equipped with a driving source; control means for controlling the driving mechanism; and detection means that detects a temperature or moisture in the vicinity of the plurality of lens groups. The driving mechanism is the mechanism that moves at least one lens group of the plurality of lens groups in an optical axis direction, and the control means has: a first driving pattern that is used for the purpose of driving of the driving mechanism; and a second driving pattern that, with respect to the first driving pattern, is wide in a driving range, and is fast in a driving velocity. The control means is configured to make the second driving pattern selectable on the basis of detection of the detection means.SELECTED DRAWING: Figure 1 【課題】 専用の換気手段を設けずに簡単な構成で短時間のうちに結露を抑えることができるレンズ鏡筒を実現する【解決手段】 複数のレンズ群と、駆動源を備えた駆動機構と、該駆動機構を制御するための制御手段と、該複数のレンズ群近傍の温度或いは湿度を検知する検知手段と、を有するレンズ鏡筒において、前記駆動機構は前記複数のレンズ群の内、少なくとも１つの群を光軸方向に移動させる機構であるとともに、前記制御手段は前記駆動機構の駆動に用いられる第１の駆動パターンと、該第１の駆動パターンに対して駆動範囲が広く、且つ駆動速度が速い第２の駆動パターンと、を有し、前記制御手段は前記検知手段による検知に基づいて第２の駆動パターンを選択可能にすることを特徴とする。【選択図】 図１