Small-diameter objective optical system

Details Small-diameter objective optical system Small-diameter objective optical system

2008-07-18

2010-06-08

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

Reexamination Certificate

active

07733583

ABSTRACT:
Reducing the outer diameter and effectively correcting various aberrations realizes a small-diameter objective optical system suitable for in vivo observation with a high numerical aperture. The invention provides a small-diameter objective optical system comprising, in order from an object plane a first lens group with positive refractive power, including at least one plano-convex lens whose convex surface faces an image plane; a second lens group with positive refractive power, including at least one concave lens; and a third lens group including a cemented lens of which a cemented surface has negative refractive power. The focal length of the third lens group is larger than the focal length of the first lens group.

REFERENCES:
patent: 2006/0215282 (2006-09-01), Hirata
patent: 10-260362 (1998-09-01), None
patent: 2006-119300 (2006-05-01), None
patent: 2006119300 (2006-05-01), None
European Search report for 08 012 390.4-1234.

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