Subminiature optical system

Details Subminiature optical system Subminiature optical system

2007-10-30

2007-10-30

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S772000

Reexamination Certificate

active

11705537

ABSTRACT:
A subminiature imaging optical system suitable for a subminiature optical device such as a mobile phone camera. An aperture stop is provided. A first lens has a positive refractive power and is convex at an object side. A second lens has a negative refractive power. A third lens has a positive refractive power. Also, a fourth lens has a negative refractive power. The optical system has a total length along an optical axis direction according to following relation 1:in-line-formulae description="In-line Formulae" end="lead"?1.2<TL/f<1.5relation 1,in-line-formulae description="In-line Formulae" end="tail"?where TL is a distance from the aperture stop to an image plane, and f is an effective focal distance of an entire optical system.

REFERENCES:
patent: 2007/0070521 (2007-03-01), Hayakawa

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