| 摘要 |
PURPOSE:To provide a lens barrel capable of accurately detecting a position and also surely capable of focusing. CONSTITUTION:A 2nd group frame 36, a front supporting frame 42 and a rear supporting frame 44 which are a least two barrel frames relatively moving in an optical direction are installed. A differential transformer for detecting the position is constituted of a primary coil 75 and secondary coils 76a and 76b installed in the 2nd group frame 36 and extending direction of a hollow part agrees with an optical axis, and a core member 74 installed in the other rear supporting frame 44 and inserted into the hollow part of the two coils. |
