Zoom lens and image pickup apparatus having same

Details Zoom lens and image pickup apparatus having same Zoom lens and image pickup apparatus having same

2007-03-21

2008-08-05

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07408720

ABSTRACT:
A zoom lens has a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, which is moved during zooming, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power, which is moved during zooming, arranged in the mentioned order from the object side to the image side. The zoom lens satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.15<|f2 |/√{square root over ((fw×ft))}<0.27 andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?5.4021 f3/fw<10.00,in-line-formulae description="In-line Formulae" end="tail"?where f2and f3are the focal lengths of the second and third lens units respectively, and fw and ft are the focal lengths of the zoom lens at the wide angle end and the telephoto end respectively.

REFERENCES:
patent: 6118593 (2000-09-01), Tochigi
patent: 7133214 (2006-11-01), Hoshi
patent: 7199942 (2007-04-01), Miyazawa
patent: 7245442 (2007-07-01), Ohtake
patent: 7277234 (2007-10-01), Hoshi
patent: 2000-089116 (2000-03-01), None
patent: 2000-227548 (2000-08-01), None
patent: 2002-182109 (2002-06-01), None
patent: 2002-287027 (2002-10-01), None

Affiliated with

Also associated with

Rating

Zoom lens and image pickup apparatus having same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom lens and image pickup apparatus having same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens and image pickup apparatus having same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4014527