Zoom lens

Details Zoom lens Zoom lens

2006-01-10

2006-01-10

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

06985301

ABSTRACT:
A zoom lens has, on the most object side, a first lens unit that has a prism with a reflecting surface for folding the path of rays, that has a negative refractive power in its entirety and that is fixed in a magnification change, and an aperture stop that is fixedly positioned in reference to the image pickup surface. The ray-entering surface of the prism has an aspherical surface concave toward the object side that exerts a weaker power for divergence at a position thereon farther from the optical axis. Whereby, a zoom lens with high optical specification performance and extremely thin size in depth direction is provided.

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