Optical: systems and elements – Lens – Multiple component lenses
Reexamination Certificate
2008-12-12
2010-10-05
Choi, William C (Department: 2873)
Optical: systems and elements
Lens
Multiple component lenses
C359S716000, C359S787000, C359S788000
Reexamination Certificate
active
07808724
ABSTRACT:
A lens system with a first group having a positive meniscus lens and a sensor. The optical distance between the front surface of the first group and the sensor can be not greater than the height of the sensor times the image F-number, which may alternatively be referred to as the working F-number. A second group can be disposed adjacent to the front focal point of the first group, and a lens-stop can be disposed adjacent to the second group. A third group can be disposed midway between the lens-stop and the object field of the first and second groups. The image F-number can be 2.8 or greater. The first group can have a doublet formed by a first lens that is plano convex and a second lens that is plano concave. The second group can have a first, plano convex lens and a second, biconvex lens forming a doublet with a third, plano concave lens.
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Gregory Hallock Smith, Camera Lenses From Box Camera to Digital, 2006, pp. title page, copyright page, 134-136, 188-190, SPIE Press, Bellingham, Washington USA.
Warren J. Smith, Modern Lens Design, A Resource Manual, 1992, title page, copyright page, 221-236, McGraw-Hill, Inc., New York, NY USA.
Choi William C
O'Connell Law Firm
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