Image forming device

Details Image forming device Image forming device

2007-05-22

2007-05-22

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C348S240300

Reexamination Certificate

active

11187465

ABSTRACT:
An image forming device is provided with: a zoom lens system TL that performs magnification varying by changing the distance between the lens units; and an image sensor SR that converts an optical image formed by the zoom lens system TL into an electric signal. The zoom lens system TL includes at least a negative first lens unit GR1and a positive second lens unit GR2, and at least the first lens unit GR1and the second lens unit GR2move in zooming from the wide angle end (W) to the telephoto end (T). The second lens unit GR2includes three lens elements of, from the object side, a positive meniscus lens element L21convex to the object side, a negative lens element L22and a positive lens element L23, and the following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?−1.0<(CR1−CR2)/(CR1+CR2)<0.0in-line-formulae description="In-line Formulae" end="tail"?(CR1is the front radius of curvature of the most object side lens element L21in the second lens unit GR2, and CR2is the rear radius of curvature of the most object side lens element L21in the second lens unit GR2).

REFERENCES:
patent: 6038084 (2000-03-01), Okada et al.
patent: 7139129 (2006-11-01), Nose et al.
patent: 2003/0138245 (2003-07-01), Watanabe
patent: 2002-323654 (2002-11-01), None
patent: 2003-131132 (2003-05-01), None

Affiliated with

Also associated with

Rating

Image forming device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image forming device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image forming device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3764988