Image pick-up lens system

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

2006-06-16

2008-10-07

Pritchett, Joshua L (Department: 2872)

Optical: systems and elements

Lens

Multiple component lenses

C359S715000, C359S569000

Reexamination Certificate

active

07433135

ABSTRACT:
A image pick-up lens system includes: a first lens with positive diffractive power, a second lens with negative diffractive power, a third lens with positive diffractive power, and a fourth lens with negative diffractive power. The first lens, the second lens, the third lens and the fourth lens are aligned in that order from an object side to an image side, and each of the four lenses is an aspheric lens made from a plastic material.

REFERENCES:
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patent: 5581405 (1996-12-01), Meyers et al.
patent: 6282033 (2001-08-01), Ning
patent: 2005/0105194 (2005-05-01), Matsui et al.
patent: 2006/0291061 (2006-12-01), Iyama et al.
patent: 2577302 (2003-10-01), None

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