Optical system and image pickup apparatus including the same

Details Optical system and image pickup apparatus including the same Optical system and image pickup apparatus including the same

2007-08-28

2007-08-28

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S665000, C359S653000, C359S796000

Reexamination Certificate

active

11466172

ABSTRACT:
At least one exemplary embodiment is directed to an optical system which includes a compound optical element including a lens element and a resin layer having different optical characteristics and having an aspherical interface therebetween. When Rref is a reference radius of curvature of the interface within an effective diameter, L is a distance from a diaphragm, ndg and νdg are a refractive index and an Abbe number, respectively, of a material of the lens element at the d-line, and ndj and νdj are a refractive index and an Abbe number, respectively, of a material of the resin layer at the d-line, the following expressions are satisfied:in-line-formulae description="In-line Formulae" end="lead"?−1.5<Rref/L<−0.3in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?one of 0.1<|ndg−ndj| and 5<|νdg−νdj|.in-line-formulae description="In-line Formulae" end="tail"?

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