Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-04-18
2006-04-18
Mack, Ricky L. (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S686000
Reexamination Certificate
active
07031072
ABSTRACT:
At least one exemplary embodiment provides a zoom lens system having multiple lens units (e.g. four) and variable optical power, which's configuration may reduce the size of a zoom lens system. In one exemplary embodiment the zoom lens system can include four lens units, a first lens unit, a second lens unit, a third lens unit, and a fourth lens unit. The lens units can be configured in accordance with at least one exemplary embodiment so that they have various positive and negative optical powers and where the distances between at least two of the lens units changes during a zooming process.
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Canon U.S.A., Inc.
Hasan M.
Mack Ricky L.
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