Wide angle imaging lens

Details Wide angle imaging lens Wide angle imaging lens

2007-10-09

2007-10-09

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S753000, C359S715000

Reexamination Certificate

active

11356239

ABSTRACT:
A wide angle imaging lens is provided and includes, in order from an object side, four lenses of a first lens of a negative meniscus lens having a convex surface on the object side, a negative second lens having a concave surface on an image side and constituting at least one of both surfaces by an aspherical surface, a positive third lens having a convex surface on the object side and constituting at least one of both surfaces by an aspherical surface, and a fourth lens having a convex surface on the image side and constituting at least one of both surfaces by an aspherical surface. Further, Abbe numbers of the respective first to fourth lenses with respect to d line are respectively set to be equal to or larger than 40, equal to or larger than 50, equal to or smaller than 40 and equal to or larger than 50, and an aperture diaphragm is arranged between the third lens and the fourth lens.

REFERENCES:
patent: 2003-232998 (2003-08-01), None
patent: 2003-307674 (2003-10-01), None
patent: 2005-227426 (2005-08-01), None

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