| 摘要 |
PURPOSE:To adjust the focus position of the lens barrel which incorporates a floating system by fixing a helicoid member adjustably in the optical-axis direction to a fixed frame member during focusing operation. CONSTITUTION:The 1st lens frame 35 united with the focus frame of the zoom lens barrel is coupled with the helicoid member 40 through a helicoid screw, and this helicoid member 40 is fixed to the frame member 33 with an adjusting screw 54 adjustably in the optical-axis direction. A floating frame 58 which supports a floating lens 57 is fitted movably in the 2nd lens frame 43, and a guide pin 59 implanted in the outer periphery of the floating frame 59 is fitted in the fork groove of a transmission arm 55 for floating fixed to the lens frame 35. The lens frame 35 does not rotate during the adjustment of the helicoid member 40, so the floating frame 58 is stationary to the lens frame 43 and the floating lens 57 does not move associatively. |
