Optical imaging arrangement comprising an opto-electronic focussing-error detection system
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United States of America Patent
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Sep 12, 1989
Issued Date -
N/A
app pub date -
Feb 9, 1988
filing date -
Feb 3, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical imaging arrangement is described which comprises an opto-electronic focussing-error detection system (1, 2, 3, 4, 5, 6, 12, 13, 14, 18, 19, 20, 21) for determining a deviation between the image plane (P.sub.L) of the imaging system (L) and a second plane (P.sub.S) in which the image is to be formed. The image plane (P.sub.F) of the focussing-error detection system is adjustable, for example by means of a pivotable plane-parallel plate (15), so that the zero point of the focussing-error signal (S.sub.f) is adjustable.
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