Imaging lens

Details Imaging lens Imaging lens

2008-04-24

2009-12-29

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S717000

Reexamination Certificate

active

07639434

ABSTRACT:
An imaging lens has a compact shape and sufficiently compensates for various aberrations.The imaging lens includes a first lens, a second lens, and a third lens disposed sequentially, with the first lens toward an object. The conditions “0.5H<T0<0.7H,” “2<φr4/φ<2.5,” and “0.15<φr5/φ<0.3” are satisfied, where: H is the effective radius of the surface of the third lens facing an image surface; T0 is the distance between the optical axis and a point on a line parallel to the optical axis and normal to the surface of the third lens facing the image surface; φ is the combined refractive power of the imaging lens; φr4 is the refractive power of the surface of the second lens facing the image surface; and φr5 is the refractive power of the surface of the third lens facing the object.

REFERENCES:
patent: 6970306 (2005-11-01), Matsuo
patent: 7064905 (2006-06-01), Murakami et al.
patent: 7099092 (2006-08-01), Sato
patent: 7180687 (2007-02-01), Sato
patent: 2006-308789 (2006-11-01), None

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