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Greater variations in the placement of documents on a copier's document glass are tolerated if the copier's optics are focused in a plane above, rather than on, the document glass.
English (United States)
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Adjustment of a Copier's Focus
Greater variations in the placement of documents on a copier's document
glass are tolerated if the copier's optics are focused in a plane above, rather than
on, the document glass.
A document is normally placed on a glass positioned in the document plane
and the optical elements are adjusted for optimum focus on a target in that plane.
Here, the optimum focus is chosen to occur in a plane above the document glass
plane so that the lower plane of acceptable focus is at the document glass plane.
Thus, greater variations in targets (such as a curled document) remain within the
acceptable range of focus as long as the upper acceptable plane of focus is not
exceeded. The particular optics used determines the depth of focus (F) which, in
turn, fixes the acceptable limits of focus.
It is preferable to use an electronic scanner for quantifying the degree of
focus of the illuminated target and adjusting the optics, under logic control, until
focus on the optimum focal plane is obtained.
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