Aspherical fiber coupling lens

Details Aspherical fiber coupling lens Aspherical fiber coupling lens

2011-08-30

2011-08-30

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S708000

Reexamination Certificate

active

08009368

ABSTRACT:
An aspherical fiber coupling lens applied to a photoelectric coupling module is disclosed. The spherical fiber coupling lens is a bi-convex lens with positive refraction power and having a first optical surface and a second optical surface, both are aspherical surfaces while optical features of the lens satisfy the following conditions:0.5<d2f<1.5;1.0<R1-R2R1+R2<2.0;1.2<(1R1-1R2)·f<2.2wherein f is the effective focal length of the lens, d2is thickness of the lens on optical axis, Ndis refraction index of the lens, R1, R2respectively are curvature radiuses of the first optical surface and the second optical surface of the lens. Thereby the lens has features of small focus, compact volume and high coupling efficiency so that applications of the photoelectric coupling module are improved.

REFERENCES:
patent: 6829105 (2004-12-01), Kubo

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