Imaging lens

Details Imaging lens Imaging lens

2006-04-25

2006-04-25

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S784000, C359S690000, C359S689000

Reexamination Certificate

active

07035024

ABSTRACT:
The present invention includes, from the object side to the image plane side, an aperture stop with a predetermined diameter, a first lens with a positive refractive power and a bi-convex shape with convex surfaces facing the object side and the image plane side, a second lens being formed as a meniscus shape with a concave surface facing the object side having a negative refractive power, and a third lens being formed as a meniscus shape with a convex surface facing the object side having a positive refractive power. By having a positive refractive power for the first lens and third lens and a negative refractive power for the second lens, a suitable back focus can be maintained while reducing the total length of the lens system. The imaging lens is thin and compact and has superior optical properties suited for mobile cameras mounted in portable telephones and PDAs.

REFERENCES:
patent: 5636065 (1997-06-01), Takato
patent: 2002/0012176 (2002-01-01), Ning
patent: 2003/0193605 (2003-10-01), Yamaguchi
patent: 2004/0212901 (2004-10-01), Nanba et al.
patent: 1 348 990 (2003-10-01), None
patent: 8-234097 (1996-09-01), None
patent: 08-234097 (1996-09-01), None
patent: 10-048516 (1998-02-01), None
patent: 11-052227 (1999-02-01), None
patent: 2004-4566 (2004-01-01), None
patent: WO-2005/026806 (2005-03-01), None
patent: WO-2005/026807 (2005-03-01), None
Patent Abstracts of Japan for JP11-052227 published Feb. 26, 1999.
Patent Abstracts of Japan for JP10-048516 published Feb. 20, 1998.
Patent Abstracts of Japan for JP08-234097 published Sep. 13, 1996.
European Search Report for EP 05 00 9108 completed on Ju. 19, 2005.
W. J. Smith, Modern Optical Engineering, Chapter 6, Stops and Apertures, pp 141-143, Mcgraw-hill Book Company, New York.

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