Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2007-11-13
2007-11-13
Sugarman, Scott J. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S691000
Reexamination Certificate
active
11559998
ABSTRACT:
At least one exemplary embodiment is directed to a zoom lens, which includes, in order from an object side to an image side, a first lens unit of negative refractive power, and a second lens unit of positive refractive power. An interval between the first and second lens units changes during zooming. The first lens unit includes a negative lens and a positive lens in order from the object side to the image side. A refractive index of a material of the negative lens, a refractive index of a material of the positive lens, a focal length of the first lens unit satisfy appropriate conditions.
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Canon Kabushiki Kaisha
Canon USA Inc. IP Division
Greece James R
Sugarman Scott J.
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