Retrofocus type optical system

Details Retrofocus type optical system Retrofocus type optical system

2006-10-03

2006-10-03

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With diverse refracting element

C359S749000

Reexamination Certificate

active

07116497

ABSTRACT:
Provided is a retrofocus type optical system including a lens or a layer made of a material satisfying the following conditions of the Abbe constant νd and partial dispersion ratios θgd and θgF,in-line-formulae description="In-line Formulae" end="lead"?νd<30,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?θgd<−3.333×10−3·νd+1.40,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?θgF<−2.615−10−3·νd+0.67.in-line-formulae description="In-line Formulae" end="tail"?In the case that this layer is disposed on the front side of the aperture stop, the layer is designed to have a positive refractive power, and in the case that the layer is disposed on the rear side of the aperture stop, the layer is designed to have a negative refractive index.

REFERENCES:
patent: 4913535 (1990-04-01), Robb
patent: 5858898 (1999-01-01), Nakahara et al.
patent: 6452728 (2002-09-01), Shikama
patent: 1065531 (2002-01-01), None
patent: 2001-074901 (2001-03-01), None

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