Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-09-14
2008-10-21
Dang, Hung X (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S714000
Reexamination Certificate
active
07440196
ABSTRACT:
An image forming optical system comprising: a first positive lens unit disposed closest to the object side in the image forming optical system; an aperture stop; and a second positive lens unit disposed closest to an image side in the image forming optical system,the second lens unit comprising: a front lens unit whose surface closest to the image side is a concave surface which faces the image side; and a rear lens unit consisting of one positive meniscus lens whose convex surface faces the image side,the image forming optical system satisfying the following conditions:in-line-formulae description="In-line Formulae" end="lead"?−1.0<R2/R3<−0.01; and (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.3<ΣD2G/FL<1.2. (2)in-line-formulae description="In-line Formulae" end="tail"?
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Dang Hung X
Kenyon & Kenyon LLP
Olympus Imaging Corp.
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