| 摘要 |
A focal position adjusting device for a small variable-magnification type copying machine having a zoom lens. First and second mirrors are arranged below an original holding stand, the first mirror reflecting the image of an original on the holding stand, and the second mirror reflecting the image from the first mirror towards a photosensitive drum. A zoom lens is disposed between the first and second mirrors. The zoom lens includes at least two lens groups arranged along the optical axis. The positions of these two lens groups are adjusted during the assembly of the copying machine so that the focal position falls on the surface of the original for various magnification settings.
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