| 摘要 |
PURPOSE:To position accurately a scanner lens, by shifting finely a lens mount by means of a cam means after roughly the scanner lens by positioning a carriage. CONSTITUTION:When a magnification ratio selection button is pushed, a stepper motor 40 starts its revolutions. Then a carriage 20 starts to move to the left from the 2nd reduction position II. When a roll 36 falls into a positioning hollow 53RI of the 1st reduction position RI, the revolution of the motor 40 stops to position the carriage 20. In this case, a roll 32 is fitted to a cam fringe 57a. Cam fringes 57a and 58a are set with distance (l) between them in direction Y. A roll 32a oscillates a fine control lever 31 clockwise round a shaft 30 and shifts an end 26a of the shaft toward X. This gives a fine shift to a lens mount which is substantially unified with the end 26a. |
