Wide converter lens and image pickup apparatus equipped with...

Details Wide converter lens and image pickup apparatus equipped with... Wide converter lens and image pickup apparatus equipped with...

2007-07-23

2008-12-09

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

C359S672000

Reexamination Certificate

active

07463424

ABSTRACT:
A compact wide converter lens having a small front-lens diameter. When attached to an object side of a main lens system, the wide converter lens provides reduced degradation of aberrations to achieve high optical performance. The wide converter lens includes a first negative lens element disposed most proximate to the object side and whose object-side surface is concave, a second positive lens element disposed at an image side of the first lens element, and a third negative lens element disposed at an image side of the second lens element. The following conditions are satisfied:in-line-formulae description="In-line Formulae" end="lead"?1.0<(r1−r2)/(r1+r2)<2.0in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−40<f1/D<−7,in-line-formulae description="In-line Formulae" end="tail"?wherein r1and r2respectively represent curvature radii of the object-side and image-side surfaces of the first lens element, f1represents a focal length of the first lens element, and D represents a spatial distance between the second and third lens elements.

REFERENCES:
patent: 2854891 (1958-10-01), Schade
patent: 6097547 (2000-08-01), Ogata et al.
patent: 6373638 (2002-04-01), Kohno
patent: 6400515 (2002-06-01), Kohno
patent: 6449100 (2002-09-01), Nakazawa et al.
patent: 6504655 (2003-01-01), Shibayama
patent: 6542310 (2003-04-01), Baba
patent: 6583939 (2003-06-01), Yoshikawa et al.
patent: 7170689 (2007-01-01), Miyazawa
patent: 2000-241700 (2000-09-01), None

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