Imaging lens
AssigneeLG Innotek Co., Ltd.
InventorDuk Keun Kwon
Life of this patent
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Abstract
An imaging lens is provided. An imaging lens according to an aspect of the present invention comprises a first lens having negative (−) refractive power, a second lens having positive (+) refractive power, a third lens having positive (+) refractive power, a fourth lens having negative (−) refractive power, a fifth lens having positive (+) refractive power, and a sixth lens having negative (−) refractive power, which are arranged in the order from an object side to an image-side, wherein each of the lenses satisfies the equation tan θd×D>−0.2 (where θd is the maximum half-angle of field of view of an optical system, and D is the degree of distortion at the maximum image height).
Claims20
An imaging lens comprising:
- a first lens having negative (−) refractive power;
- a second lens having positive (+) refractive power;
- a third lens having positive (+) refractive power;
- a fourth lens having negative (−) refractive power;
- a fifth lens having positive (+) refractive power;
- and
- a sixth lens,
- wherein the first to sixth lenses are disposed in order from an object-side to an image-side,
- wherein the imaging lens satisfies an equation:
- tan θd×D>−0.2,
- wherein θd is a maximum half-angle of field of view of an optical system, and D is a degree of distortion at a maximum image height,
- wherein a radius of curvature of an object-side surface of the first lens is negative at an optical axis,
- wherein a radius of curvature of an object-side surface of the fourth lens is negative at the optical axis, and
- wherein a radius of curvature of an object-side surface of the fifth lens is negative at the optical axis.
An imaging lens comprising:
- a first lens having negative (−) refractive power;
- a second lens having positive (+) refractive power;
- a third lens having positive (+) refractive power;
- a fourth lens having negative (−) refractive power;
- a fifth lens having positive (+) refractive power;
- and
- a sixth lens having negative (−) refractive power,
- wherein the first to sixth lenses are disposed in order from an object-side to an image-side,
- wherein the first lens is disposed closest to the object-side, and the sixth lens is disposed closest to the image-side,
- wherein an image-side surface of the first lens is formed to be concave at an optical axis,
- wherein a radius of curvature of an object-side surface of the first lens is negative at the optical axis,
- wherein a radius of curvature of an object-side surface of the fourth lens is negative at the optical axis, and
- wherein a radius of curvature of an object-side surface of the fifth lens is negative at the optical axis.
An imaging lens comprising:
- a first lens having negative (−) refractive power;
- a second lens having positive (+) refractive power;
- a third lens having positive (+) refractive power;
- a fourth lens having negative (−) refractive power;
- a fifth lens having positive (+) refractive power;
- and
- a sixth lens having negative (−) refractive power,
- wherein the first to sixth lenses are disposed in order from an object-side to an image-side,
- wherein, at an optical axis, a distance between the third lens and the fourth lens is greater than a distance between the fifth lens and the sixth lens,
- wherein a radius of curvature of an object-side surface of the first lens is negative at the optical axis,
- wherein a radius of curvature of an object-side surface of the fourth lens is negative at the optical axis, and
- wherein a radius of curvature of an object-side surface of the fifth lens is negative at the optical axis.
Dependencies are inferred from the claim text.