Three element objective lens system using Germanium lens element

Three element objective lens system using Germanium lens element

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 astigmatis...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: NORRIE DAVID GORDON
Format: Patent
Sprache:eng
Schlagworte:
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Beschreibung
Zusammenfassung: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).