Three element objective lens system using Germanium lens element
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United States of America Patent
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May 22, 2001
Grant Date -
N/A
app pub date -
May 3, 1999
filing date -
May 8, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An objective lens system 10 uses Germanium lens elements including a positively-powered objective lens (A), a positively-powered intermediate lens (B) and a negatively-powered field lens (C). The field lens (C) flattens the Field curvature of the system. The intermediate lens (B) corrects astigmatism and has an aspheric surface (3).
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