Optical system and optical device including the same

Details Optical system and optical device including the same Optical system and optical device including the same

2011-05-24

2011-05-24

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S745000

Reexamination Certificate

active

07948691

ABSTRACT:
Provided is a zoom lens system including: in order from an object side to an image side, a first lens unit having a positive refractive power; an aperture stop; and a second lens unit, in which the first lens unit includes a first-a lens unit having a positive refractive power and a first-b lens unit having a negative refractive power which moves along an optical axis in focusing, the first-b lens unit includes at least one negative lens and at least one positive lens, and the following conditional expression is satisfied: 0.020<θgF1−0.6438+0.001682×vd1<0.100, where θgF1 denotes a partial dispersion ratio of a material of the positive lens, and vd1 denotes Abbe number of the positive lens.

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“PgF Diagram” Schott Catalogue Jan. 1, 1981. Schott, Mainz, XP002612262. Cited in Extended European Search report issued in corresponding European Patent Application No. 10178308.2 dated Jan. 20, 2011.
Schott “Abbe Diagram” XP002612261, Aug. 1, 2010. URL:http://www.schott.com/advanced—optics/german/download/301576—diagramm-poster—d.pdf> Cited in Extended European Search report issued in corresponding European Patent Application No. 10178308.2 dated Jan. 20, 2011.
Sugita, Shigenobu. “Optical System and Optical Apparatus Having the Same,” Specification and Drawings of related copending U.S. Appl. No. 12/904,727, filed Oct. 14, 2010, pp. 1-34.
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