Zoom lens and imaging system

Details Zoom lens and imaging system Zoom lens and imaging system

2007-10-30

2007-10-30

Thompson, Tim (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S772000

Reexamination Certificate

active

11552541

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 having positive refractive power and is stationary during zooming, a second lens unit configured to move to perform zooming, a third lens unit configured to move to compensate for variation of an image plane caused by zooming, and a fourth lens unit having positive refractive power and is also stationary during zooming. The first lens unit includes, in order from the object side to an image side, a first lens subunit having positive refractive power and is stationary during focusing, a second lens subunit having positive refractive power, and a third lens subunit having negative refractive power and is also stationary during focusing. The second lens subunit moves along an optical axis during focusing.

REFERENCES:
patent: 6891680 (2005-05-01), Sato
patent: 7057827 (2006-06-01), Wakazono
patent: 2005-292524 (2005-10-01), None

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