Photographic lens

Details Photographic lens Photographic lens

2008-01-22

2008-01-22

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S715000

Reexamination Certificate

active

11698331

ABSTRACT:
A small size photographic lens for the photographic unit of a device such as a camera or a camera phone. The photographic lens includes: a first lens having positive refractive power; a second lens having negative refractive power and a convex surface facing the object side; a third lens having positive refractive power; and a fourth lens having negative refractive power at the center portion, in which the negative refractive power becomes weaker from the center portion toward the peripheral portion of the fourth lens, and having a positive refractive power at the peripheral portion thereof, the lenses being numbered in order of location from the object.

REFERENCES:
patent: 7012765 (2006-03-01), Matsui et al.
patent: 7177098 (2007-02-01), Arai
patent: 2005/0105194 (2005-05-01), Matsui et al.
patent: 2006/0092528 (2006-05-01), Arai
patent: 2002-365529 (2002-12-01), None
patent: 2003-149547 (2003-05-01), None
patent: 2004-102234 (2004-04-01), None
patent: 2004-0060621 (2004-07-01), None

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