| 摘要 |
PROBLEM TO BE SOLVED: To remove a backlash of an optical system member in a focusing area by displacing the optical system member to a position where it is depressed or not depressed to the guiding part of a cam member in accordance with the position at the guiding part of the cam member by the guiding part of the cam member and a biasing member. SOLUTION: A projecting part somewhat projecting in a 1st cam groove 6a in an optical axis OA direction is formed on the left end face side of a pressing ring 22. The projected part corresponds to a cam area (focusing area) where the focusing operation of photographing lens systems 1 and 3 is performed. When the pin 2a of a 1st lens holder 2 is within the cam area (focusing area), the projecting part abuts on the pin 2a and presses it on the left end face of the 1st cam groove 6a of the cam barrel 6. Thus, the projecting part acts so that the backlash between the 1st cam groove 6a and the pin 2a may be removed. Then, the projecting part acts so that driving load to rotate the cam barrel 6 may not become large. |
