| 摘要 |
PURPOSE:To accurately transmit the operation of a nut to a moving frame for a focus lens and to put the moving frame for the focus lens in smooth operation following up the operation of the nut by engaging the engagement part of the nut with the moving frame for the focus lens by pressing them with an elastic member. CONSTITUTION:When a focus motor begins to rotate, a screw shaft 29 rotates and the nut 31 begins to slide in the direction of the optical axis, but the engagement part 31a and moving frame 33 for the focus lens are pressed by the elastic member 34 and engaged, so they do not rotate as shown by an arrow B when the nut 31 is actuated. The operation of the nut 31 is therefore accurately transmitted to the moving frame 33 for the focus lens, which operates smoothly following up the operation of the nut 31. |
