Subminiature optical system

Details Subminiature optical system Subminiature optical system

2006-12-26

2006-12-26

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S784000

Reexamination Certificate

active

07154681

ABSTRACT:
A subminiature optical system used in a subminiature image sensor module is provided. The subminiature optical system has a first lens group, a second lens group and a third lens group sequentially arranged from the object side. The first lens group has a first lens of plus refractive power and a second lens of minus refractive power, the second lens being cemented to the first lens. The second lens group has a third lens where at least one refraction surface is aspherical and has minus refractive power. The third lens group has a fourth lens where at least one refraction surface is aspherical and has minus refractive power. The subminiature optical system can have a high resolution and a compact-sized lens construction with a small number of lens combinations. Also, the subminiature optical system can have a small dimension of an axial direction in a whole construction.

REFERENCES:
patent: 6476982 (2002-11-01), Kawakami
patent: 2003/0184883 (2003-10-01), Sato et al.

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