Imaging lens unit

Details Imaging lens unit Imaging lens unit

2008-09-24

2009-11-17

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S793000, C369S112230

Reexamination Certificate

active

07619836

ABSTRACT:
An imaging lens unit comprising, in order from the object side, a first lens having a meniscus shape with its convex surface on the object side, an aperture stop and a second lens having a meniscus shape with its convex surface on the image side. A maximal value of a tangent angle within a range of a lens surface effective diameter of the surface on the object side of the first lens is 70 to 90 degrees. A maximal value of a tangent angle within a range of a lens surface effective diameter of the surface on the image side of the second lens is 70 to 90 degrees.

REFERENCES:
patent: 6888686 (2005-05-01), Do
patent: 6992841 (2006-01-01), Saito et al.
patent: 7206144 (2007-04-01), Tamura
patent: 7236315 (2007-06-01), Chen et al.
patent: 7446958 (2008-11-01), Minakawa et al.
patent: 2009/0153983 (2009-06-01), Nakanishi et al.
patent: A-2003-232990 (2003-08-01), None

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