| 摘要 |
PURPOSE:To absorb the tolerance of lens focal length by coupling a cam which rocks through the movement of a cam follower with a mirror moving means, and providing a means which adjusts the position shape of the cam. CONSTITUTION:A carriage 13 supporting mirrors 8 and 9 which receive light from an exposure lamp 6 and a mount 14 supporting a lens 11 move to right and left freely. The oscillatory cam 32 supported by the cam follower at the lower end of the mount 14 is supported pivotally on a shaft 33 while divided into a left and a right pieces 32a and 32b, and a wire 34 is coupled with the other end. The cam 32 rocks upward and downward through the movement of the mount 14, but when the wire 34 is drawn, the carriage 13 moves to left and an optical path varies in length. At this time, screws 42 and 41 of the cam 32 are adjusted to absorb the tolerance of the focal length of the lens 11. Therefore, the tolerance of the focal length is absorbed by adjusting the oscillatory cam 32 and only one cam is required, so the structure is simplified. |
