Optical: systems and elements – Lens – With light limiting or controlling means
Reexamination Certificate
2007-12-11
2007-12-11
Schwartz, Jordan M. (Department: 2873)
Optical: systems and elements
Lens
With light limiting or controlling means
C359S784000, C359S716000
Reexamination Certificate
active
11121024
ABSTRACT:
An imaging optical system includes an aperture stop, a positive first lens group, and a positive or negative second lens group. The first lens group includes a positive first lens element and a negative second lens element. The first lens element is provided with an aspherical surface on the object-side surface thereof. The aspherical surface is formed so that the higher a height from the optical axis in a radial direction becomes the more an aspherical surface at the height is displaced toward the object, compared with a paraxial spherical surface. The second lens group includes a meniscus third lens element. The meniscus third lens element is provided with an aspherical surface on each lens surface thereof, and has the convex surface facing toward the object in the vicinity of the optical axis.
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English Language Abstract of JP 5-188284.
English Language Abstract of JP 2001-075006.
English Language Abstract of JP 2002-228922.
English Language Abstract of JP 2004-004566.
PENTAX Corporation
Schwartz Jordan M.
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