Klose K
Appl Opt. 1978 Jan 15;17(2):203-10. doi: 10.1364/AO.17.000203.
If an inexpensive postobjective laser scanner is used for high-resolution scanning of wide formats, the focus either describes a curved scanning line or departs from the scanning plane. To eliminate these drawbacks, it is shown that the laser beam, if first deflected by a rotating polygon mirror, may be positioned by an additional mirror just in front of the scanning plane to rectify the curve. The shape of the additional mirror, which depends on the properties of the deflection unit, was determined in solving a differential equation. Unfortunately, the resulting mirror shape follows a complicated curve which is difficult to manufacture. Further calculations, however, showed that the deviation of the focus path from a straight scanning line can be made small, even for large scan widths, if circular and elliptical additional mirrors are utilized.
如果使用价格低廉的后置物镜激光扫描仪对大幅面进行高分辨率扫描，焦点要么描绘出一条弯曲的扫描线，要么偏离扫描平面。为消除这些缺点，研究表明，如果激光束首先由旋转多面镜偏转，那么可以通过位于扫描平面正前方的附加镜来定位，以修正曲线。附加镜的形状取决于偏转单元的特性，它是在求解一个微分方程时确定的。不幸的是，所得的镜形遵循一条复杂的曲线，难以制造。然而，进一步的计算表明，即使对于大扫描宽度，如果使用圆形和椭圆形附加镜，焦点路径与直线扫描线的偏差也可以变得很小。
