| 摘要 |
PURPOSE:To widen the range of copy magnification greatly without varying the size of the copying machine frame by providing an attachment lens for increasing the reduction rate or enlargement rate of a zoom lens at the end position of the movement range of the zoom lens. CONSTITUTION:The attachment lens 10 is mounted on the zoom lens Z at the position 6' near the end of the reduction range of the zoom lens Z. The attachment lens 10 consists of a concave lens 12 and a convex lens 13, and an image of higher reduction magnification than when only the zoom system Z is used is formed on a drum 7. When the zoom lens Z is set at the opposite end position for enlargement, the addition of the attachment lens increases the enlargement magnification of copying. Consequently, the range of copy magnification is widened without increasing the movement range of the zoom lens and sometimes the size of the copying machine and a reduced and an enlarged copy are taken at a time although those copies need to be taken individually before. |
