Unified Optical Scanning Technology

Chapter 4.3.5 - Scanner Devices and Techniques: Design Considerations

4.3.5 Design Considerations

A significant architectural distinction between the two types of polygons (not charted in Table 4.1) is the relative freedom of orientation of objective optics with respect to the scanner. Comparing Figures 3.6 and 3.7, one sees that the input and output beams of Figure 3.6 are so separated that the objective lens may be placed arbitrarily close to the pyramidal polygon, whereas Figure 3.7 shows a need for strict observance of the pupil relief distance of the objective lens to avoid its truncation of the input beam. A larger pupil relief distance requires use of a larger-diameter objective lens and its attendant increase in size and cost. And, observing the monogon of Figure 1.10, and extending that to a (postobjective) pyramidal polygon, one can also appreciate the option of orienting the input objective lens arbitrarily close to the polygon. These factors relating to pupil relief distance are taken into account in the following discussion with regard to the popular case of the underfilled prismatic polygon.

 

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