Endoscopic objective optical system, and imaging system...

Details Endoscopic objective optical system, and imaging system... Endoscopic objective optical system, and imaging system...

2007-10-09

2007-10-09

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

Reexamination Certificate

active

11434793

ABSTRACT:
The invention provides a wide-angle, low-cost endoscopic objective optical system that is reduced in terms of distortion and field curvature and composed only of spherical lenses, especially a video endoscopic objective optical system. The optical system comprises a first group G1comprising a negative meniscus lens convex on an object side thereof, an aperture stop S, a second group G2comprising a positive lens having a plane directed toward an object point side, a third group G3including at least one concave refractive surface and having a positive refracting power as a whole, and a fourth group G4comprising a cemented lens comprising a negative meniscus lens and a double-convex lens and having positive refracting power, so that an image is formed at an imaging device I via the first group G1to the fourth group G4. A chief ray is reflected at the convex surface of the positive lens in the second group in a direction away from an optical axis.

REFERENCES:
patent: 6464631 (2002-10-01), Girke et al.
patent: 60-080816 (1985-05-01), None

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