Double-sided telecentric measurement objective
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United States of America Patent
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Jan 13, 1998
Grant Date -
N/A
app pub date -
Jun 3, 1996
filing date -
Jun 3, 1995
priority date (Note) -
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Abstract
A double sided telecentic measurement objective for contactless length measurement in two-dimensional and three-dimensional space. The objective has an image-side optical system consisting of three elements equivalent to those of an object-side optical system but in the reverse order, including a cemented positively refracting lens element turned toward the object of image respectively, a collecting lens spaced by an air gap from the cemented lens, and a dispersive meniscus spaced by an air gap from the collecting lens. The widths of the air gaps between the collecting lenses and the meniscus are substantially greater than the widths of air gaps between the cemented lens elements and the collecting lenses.
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