Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2007-12-21
2010-10-19
Harrington, Alicia M (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S773000
Reexamination Certificate
active
07817356
ABSTRACT:
An imaging lens comprises a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4), which are arranged in ascending sequence, starting from the lens nearest to the object. The first lens (L1) has a double-convex shape and positive refractive power. The second lens (L2) has a double-concave shape and negative refractive power. The third lens (L3) has a meniscus shape with its convex surface facing an image plane, and has positive refractive power. The fourth lens (L4) has a meniscus shape with its convex surface facing the object. A chromatic aberration occurred in the first lens (L1) is corrected by the second lens (L2). A chromatic aberration occurred in the third lens (L3) is corrected by the fourth lens (L4).
REFERENCES:
patent: 2002-365529 (2002-12-01), None
patent: 2002-365530 (2002-12-01), None
patent: 2005-292559 (2005-10-01), None
patent: 2007-017984 (2007-01-01), None
patent: 2007-219520 (2007-08-01), None
Harrington Alicia M
SEIKO Precision Inc.
Townsend and Townsend / and Crew LLP
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