Image pick-up lens system

Details Image pick-up lens system Image pick-up lens system

2008-03-04

2008-03-04

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Diffusing

C359S566000, C359S569000, C359S570000, C359S708000, C359S718000, C359S739000, C359S642000

Reexamination Certificate

active

11222182

ABSTRACT:
An image pick-up lens system from an object side to an image side includes an aperture stop (10), and a meniscus-shaped lens (20) having a concave surface on the object side and a convex surface on the image side. The lens has at least one aspheric surface and a diffraction grating provided on the convex surface thereof. The lens system satisfies the following condition: (1) 0.1<R2/R1<0.5, wherein, R1 is an absolute value of a radius of curvature of the concave surface of the lens, and R2 is an absolute value of a radius of curvature of the convex surface of the lens. Condition (1) governs a distribution of refracting power for the lens, in order to correct monochromatic aberrations. The lens system also satisfies other conditions (2)-(4) as disclosed, in order to provide compactness, cost-effectiveness and improved optical performance.

REFERENCES:
patent: 6055105 (2000-04-01), Boku et al.
patent: 2002/0041451 (2002-04-01), Harada
patent: 2003/0016454 (2003-01-01), Yamaguchi et al.
patent: 2003/0117723 (2003-06-01), Shinohara
patent: 2003/0193605 (2003-10-01), Yamaguchi
patent: 2004/0012861 (2004-01-01), Yamaguchi

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