Optical lens system for taking image

Details Optical lens system for taking image Optical lens system for taking image

2008-11-27

2010-10-12

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S773000, C359S774000

Reexamination Certificate

active

07813057

ABSTRACT:
An optical lens system for taking image comprises: a first lens element with positive refractive power, an Abbe Number of the first lens element being V1, and it satisfying the relation: 50<V1<60; a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a third lens element having a convex object-side surface and a concave image-side surface, at least one of the object-side and the image-side surfaces of the third lens element being aspheric; a fourth lens element having at least one aspheric surface; and an aperture stop being located in front of the second lens element.

REFERENCES:
patent: 2500046 (1950-03-01), Schade
patent: 6259508 (2001-07-01), Shigematsu
patent: 7515358 (2009-04-01), Noda

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