| 摘要 |
PURPOSE:To secure the automatic focusing of a lens barrel by fixing a focus helicoid and a focus ring by a focus adjusting dowel which has a 1st and a 2nd projections coupled mutually with a deformable coupling part. CONSTITUTION:The focus adjusting dowel 46 is inserted into the hole 48 of the focus ring 39, and the 1st projection 62 and the 2nd projection 63 of the focus adjusting dowel 46 are engaged with the 1st groove 60 and the 2nd groove 61 of the focus helicoid 36 respectively so as to rotate the focus helicoid 36 and focus ring 39 in one body. In this state a film tape 49 is wound to fix the focus adjusting dowel 46 and focus ring 39. Thus, the film tape 49 is wound to connect the 1st projection 62 and the 2nd projection 63 of the focus adjusting dowel 46 by the connection part 64 which easily deforms, so the 1st projection 62 and the 1st groove 60, and the 2nd projection 63 and the 2nd groove 61 are pressed securely against each other to engage each other. Consequently, automatic focusing is secured. |
