| 摘要 |
PURPOSE:To adjust the rotary torque of an adjusting operation member for an elastic member finely and to maintain the state stably rotating a rotary torque adjusting member relatively to a fixed lens barrel and varying energizing force to the focus adjusting operation member. CONSTITUTION:When the focus adjusting operation member 3 fitted around the fixed lens barrel 1 is rotated, a moving cylinder 2 moves forth and back through a roller 8 to adjust the focus. A screw 6 is unclamped and the torque adjusting member 5 engaging the lens barrel 1 with a fine-pitch screw 1b is clamped gradually to left, and then the operation member 3 is applied with thrust-directional energizing force from the elastic member 7 with less friction set beyond the adjusting member 5, so that the rotary torque between the lens barrel 1 and operation member 3 increases gradually. Therefore, a user uses the adjusting member 5 to adjust finely the position where desired torque is obtained and then fixes the screw 6 to maintain the state stably. |
