Imaging lens

Details Imaging lens Imaging lens

2005-12-27

2005-12-27

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S784000, C359S753000

Reexamination Certificate

active

06980372

ABSTRACT:
The present invention is an imaging lens in which various aberrations are favorably corrected, the optical length is short, and a sufficient back focus is secured. The imaging lens is constituted by arranging a first lens L1, an aperture diaphragm S1, a second lens L2, and a third lens L3in succession from the object side to the image side. The first lens L1is a lens having a positive refractive power and a meniscus shape in which the convex surface faces the object side, the second lens L2is a lens having a negative refractive power and a meniscus shape in which the convex surface faces the image side, and the third lens L3is a lens in which the convex surface faces the object side.

REFERENCES:
patent: 6795253 (2004-09-01), Shinohara
patent: 2004/0179274 (2004-09-01), Takahiro
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patent: 2003-322792 (2003-11-01), None
patent: WO 2004/038478 (2004-05-01), None

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