Metrologic Instruments MS700i - Manual (Page 34)

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Depth of Field for the MS720i Scanner
Through the glass at the front of the scanner, safe, low powered laser beams
are projected in a complex pattern that resembles a spider web. Each of the
five scan fields that generate the scan pattern extends to a range of 178mm
(7.0"). The range begins 178mm (7.0") from the face of the scanner window
and extends from the unit for a distance of 381mm (15.0") measured along the
scanning beam at the center of each scan segment. This 178mm - 381
mm
(7" - 15") range is the depth of field for the MS720i scanner. (Refer to Figure
12)
The scan pattern is projected at a slight angle downward from the front of the
scanner (approximately 10 degrees, overall). As the scan fields move outward,
they expand. Like an image expands from a film projector as it moves toward
the screen at a movie theater, the scan pattern projects out to a well-defined
region. Any label that is facing toward the scanner can be read at any point
within the scanning field.
Figure 12