Image forming lens and portable information terminal

Details Image forming lens and portable information terminal Image forming lens and portable information terminal

2007-02-08

2008-10-21

Mack, Ricky L (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S718000, C359S739000, C359S796000

Reexamination Certificate

active

07440197

ABSTRACT:
The image forming lens comprises a stop and a single lens placed in this order from the object side, wherein if the object-side surface of the single lens having paraxial curvature radii to form biconvex surfaces is referred to as the first surface while the image-side surface is referred to as the second surface, both the first surface and the second surface of said single lens have an aspherical shape, and the focal length f, the distance d0along the axis from the stop to the first surface of the single lens, the paraxial curvature radius R1of the first surface and the distance L0along the axis from the stop to the focal points satisfy the following conditional expressions:in-line-formulae description="In-line Formulae" end="lead"?0.18<d0/f<0.25   (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.60<R1/f<0.85   (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.40<L0/f<1.55.   (3)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 4964703 (1990-10-01), Suda et al.
patent: 2006-010990 (2006-01-01), None

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