OPTICAL SCANNER AND DEVICE FOR AUTOMATICALLY ADJUSTING INFLUENCE OF CHANGE IN FOCAL LENGTH OF SCANNING IMAGING OPTICAL SYSTEM OF OPTICAL SCANNER

摘要

PURPOSE: To automatically correct the influence of a change in focal length by a change in temp. of the scanning and imaging optical system having ≥1 plastic lenses. ;CONSTITUTION: The plastic lens 62 is freely slidable in an optical axis direction relative to a supporting member 70 and the material and length of a bar-shaped member 90 and the displacement expansion ratio of a lever member 100 are so determined that the influence of the change in the focal length of the scanning and imaging optical system by the temp. change is corrected by displacement of the plastic lens 62 displaced by the lever member 100 according to a change in the length of the bar-shaped member 90 by the temp. change.;COPYRIGHT: (C)1995,JPO