ATHERMALIZED DIFFRACTIVE LENS SYSTEM

ATHERMALIZED DIFFRACTIVE LENS SYSTEM

An objective lens system for a thermal image detection device includes a first lens group and a second lens group from the object side in order. The first lens group includes a first lens having negative refractive power and a second lens having positive refractive power and has positive refractive...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KIM, PYEONG HYEON, HWANG, BYEONG SEOL, YOON, BYEONG SEON
Format: Patent
Sprache:eng ; kor
Schlagworte:
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Beschreibung
Zusammenfassung:An objective lens system for a thermal image detection device includes a first lens group and a second lens group from the object side in order. The first lens group includes a first lens having negative refractive power and a second lens having positive refractive power and has positive refractive power in general. The second lens group includes a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having positive refractive power and has positive refractive power in general. At least one lens among lenses included in the first and second lens groups is a diffractive aspheric lens. The first lens has the greatest refractive index among the lenses.