Single focus lens

Details Single focus lens Single focus lens

2005-08-16

2005-08-16

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S740000

Reexamination Certificate

active

06930841

ABSTRACT:
A single focus lens includes, in order from the object side: a glass first lens component of positive refractive power and with a convex surface on the object side; a diaphragm stop; a second lens component of plastic, a meniscus shape with its concave surface on the object side, and which includes at least one aspheric surface; and a third lens component of plastic, a meniscus shape with it convex surface on the object side, and which includes two aspheric surfaces. Each lens component may consist of a single lens element. Specified conditions are satisfied in order to reduce aberrations, to insure that the light rays at the image plane are substantially orthogonal to the image plane, and to insure that a sufficient back focus is provided so as to enable the insertion of other optical elements.

REFERENCES:
patent: 6414802 (2002-07-01), Betensky
patent: 6441971 (2002-08-01), Ning
patent: 10-48516 (1998-02-01), None
patent: 2002-221659 (2002-08-01), None

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