Compact image pickup lens

Details Compact image pickup lens Compact image pickup lens

2007-03-26

2008-10-28

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S784000, C359S785000

Reexamination Certificate

active

07443614

ABSTRACT:
A compact image pickup lens includes, in order from an object side to an image side, a first lens element G1of positive refractive power, a second lens element G2of positive refractive power, and a third lens element G3of negative refractive power. The first lens element has a meniscus shape with its convex surface L1on the object side. The second lens element also has a meniscus shape but with its convex surface L4on the image side. Each of the first, second and third lens elements has at least one aspheric surface. An aperture STO is further positioned in front of the second lens element. The image pickup lens satisfies the following conditions: 0.85≦(v1/v2)≦1.15 and 0.85≦(v2/v3)≦1.25, where v1is the Abbe number at the d-line (587.5618 nm) of the first lens element, v2is the Abbe number at the d-line (587.5618 nm) of the second lens element, and v3is the Abbe number at the d-line (587.5618 nm) of the third lens element.

REFERENCES:
patent: 7286305 (2007-10-01), Nakamura

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