Single focus wide-angle lens

Details Single focus wide-angle lens Single focus wide-angle lens

2007-02-20

2007-02-20

Spector, David (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S784000

Reexamination Certificate

active

11076060

ABSTRACT:
A single focus wide-angle lens includes, in order from the object side: a first lens component of positive refractive power, having a meniscus shape, and having a convex object-side surface; a stop; a second lens component of positive refractive power, having a meniscus shape, having at least one aspheric surface, having a concave object-side surface, and being made of plastic; and a third lens component of negative refractive power, having a meniscus shape, having both surfaces of aspheric shape, having an image-side surface that is concave on the optical axis, and being made of plastic. The single focus wide-angle lens may include only three lens elements. Specified on-axis conditions are satisfied in order to reduce aberrations and to make the single focus wide-angle lens compact. Additionally, satisfying a condition related to the half-field angle at the maximum image height helps reduce aberrations.

REFERENCES:
patent: 2004/0021957 (2004-02-01), Isono
patent: 2005/0231822 (2005-10-01), Sato
patent: 10-48516 (1998-02-01), None
patent: 2003-322792 (2003-11-01), None

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