Pickup lens

Details Pickup lens Pickup lens

2006-03-07

2006-03-07

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S770000, C359S680000, C359S781000, C359S686000

Reexamination Certificate

active

07009783

ABSTRACT:
A pickup lens is provided in which various aberrations are satisfactorily corrected, which can be manufactured at low cost, and which has an optical length of 10 mm or less. This pickup lens is configured by arranging, in order from the object side, a first lens L1with a meniscus shape with concave surface on the object side and having negative refractive power, an aperture diaphragm S, a second lens L2with convex surfaces on both sides and having positive refractive power, a third lens L3with concave surfaces on both sides and having negative refractive power, and a fourth lens L4with convex surfaces on both sides and having positive refractive power; and with the following conditions satisfied.in-line-formulae description="In-line Formulae" end="lead"?+5.0<(r2+r1)/(r2−r1)<+7.0  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.15f<d1<0.3f  (2)in-line-formulae description="In-line Formulae" end="tail"?Here r1is the radius of curvature of the object-side surface of the first lens in the vicinity of the optical axis (axial radius of curvature), r2is the radius of curvature of the image-side surface of the first lens in the vicinity of the optical axis (axial radius of curvature), d1is the thickness of the first lens, and f is the focal length of the entire system.

REFERENCES:
patent: 5459615 (1995-10-01), Yahagi
patent: 05249372 (1993-09-01), None
patent: 11084234 (1999-03-01), None
patent: 11038316 (1999-12-01), None
patent: 2000171697 (2000-06-01), None
patent: 2002-098888 (2002-04-01), None
patent: 2002-517773 (2002-06-01), None
patent: WO 99 63379 (1999-12-01), None

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