Subminiature imaging optical system
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorsJin Jong Kim, Young Gi Kim, Yong Joo Jo
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Abstract
There is provided a subminiature imaging optical system utilizing only three sheets of lenses having positive, negative and positive refractive powers, respectively. The subminiature imaging optical system comprising, sequentially from an object side: a first lens having a meniscus shape with a convex object-side surface, the first lens having at least one aspherical surface and positive refractive power; a second lens having a meniscus shape with a convex image-side surface, the second lens having at least one spherical surface and negative refractive power; and a third lens having both surfaces formed of an aspherical surface and having positive refractive power.
Claims7
A subminiature imaging optical system comprising, sequentially from an object side:
- a first lens having a meniscus shape with a convex object-side surface, the first lens having at least one aspherical surface and positive refractive power;
- a second lens having a meniscus shape with a convex image-side surface, the second lens having a spherical surface and negative refractive power;
- and
- a third lens having both surfaces formed of an aspherical surface and having positive refractive power,
- wherein the first lens satisfies following condition 1 and the third lens satisfies following conditions 2 and 3:
- 0.4<f1/f<0.8 condition 1,
- 1.4<Tmax/Tmin<3.0 condition 2,
- 1.5<f3/f<5.0 condition 3,
- where f is an effective focal length of the optical system, f1 is a focal length of the first lens, Tmax is a maximum thickness of the third lens within an effective aperture, Tmin is a minimum thickness of the third lens within an effective aperture and f3 is a focal length of the third lens.
Dependencies are inferred from the claim text.