| 摘要 |
PURPOSE:To adjust an optical system rationally in a short time by fixing the 1st mirror and moving finely an end of a wire which moves the 2nd and the 3rd mirrors to adjust the positions of the 2nd and the 3rd mirrors. CONSTITUTION:The 1st mirror 5 and the 2nd and the 3rd mirrors 7 and 8 are set at specific positions by using an assembling jig, and driving wires 21 and 25 are extended on both front and rear sides of the 1st and the 2nd blocks 6 and 9. The fixed end 21a is moved to left for long focal length or moved to right for short focal length, thus performing focusing. Even when the fixed end 21a is moved, the path of the wire 21 from a movable pulley 22 to a fixed bead 24a is unchanged, so the 1st block 6 does not shift in position and the 1st mirror 5 is fixed in position. On the other hand, the fixed end 21a is moved to left to shift a movable pulley 26 in position to left and the 2nd and the 3rd mirrors 7 and 8 move to left to make a focus adjustment. |
