| 摘要 |
PURPOSE:To prevent electric trouble and conspicuous flaws from being generated by fitting a fixed plate with a lock claw which has a female screw part nearby the center in the fitting part between an internal lens barrel and an external lens barrel, engaging the male screws part of a lock bolt with the female screw part of the fixed plate, and coupling both the lens barrels. CONSTITUTION:When the internal lens barrel 1 is moved forward and backward for lens focusing, the lock bolt 9 engages cam holes 2a and 2b (3a and 3b) of the external lens barrel 2 (3), so the internal lens barrel 1 rotates along its cam hole and moves in the direction of the optical axis. At the end of the focusing, the lock bolt 9 is rotated to screw the male screw part at the tip in the female screw part of the fixing nut 10 fitted in the fitting groove 1a of the internal lens barrel 1. Then when the lock bolt 9 is rotated to the end, the fixing nut 10 and lock claw 11 move up and the internal lens barrel 1 and external lens barrel 2 (3) are fixed. Even if the fixed plate 10 flaws since it comes into contact in the external lens barrel, the flaw is not exposed to the human eye and the fixing nut 10 is fitted in the fitting groove 1a and never comes out of the lens barrel, so that trouble such as a short circuit is not caused. |
