US 11,231,565 B2 · Optical lens comprising eight lenses of −−++−++− refractive powers

Abstract

An optical lens, in order from an object side to an image-forming side, includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, respectively having negative, negative, positive, positive, negative, positive, positive and negative refractive power. The curvature radius of the object-side surface of the first lens is greater than the curvature radius of the image-side surface of the first lens; the image-side surface of the eighth lens has an effective radius r and a vertex point, H is a distance between the vertex point and the optical axis, the image-side surface of the eighth lens intersects with the optical axis at an intersection point, d is a distance between a projected position of the vertex point on the optical axis and the intersection point, and |r/d|≤30 and/or |r/H|≤2.

Claims20

Dependent claims

An optical lens, in order from an object side to an image-forming side, comprising:

a first lens having negative refractive power;
a second lens having negative refractive power;
a third lens having positive refractive power;
a fourth lens having positive refractive power;
a fifth lens having negative refractive power;
a sixth lens having positive refractive power;
a seventh lens having positive refractive power;
and
an eighth lens having negative refractive power and comprising an image-side surface with a vertex point, wherein r is an effective radius of the image-side surface, the image-side surface intersects with an optical axis of the optical lens at an intersection point, H is a distance between the vertex point and the optical axis, the vertex point projects on the optical axis at a projection location, d is a distance between the projection location and the intersection point, and |r/d|≤30 and/or |r/H|≤2.

6 more elements

An optical lens, in order from an object side to an image-forming side, comprising:

a first lens having negative refractive power and comprising an object-side surface and an image-side surface, wherein R1 is a curvature radius of the object-side surface, R2 is a curvature radius of the image-side surface, and |R1/R2|≥1;
a second lens having negative refractive power;
a third lens having positive refractive power;
a fourth lens having positive refractive power;
a fifth lens having negative refractive power;
a sixth lens having positive refractive power;
a seventh lens having positive refractive power;
and
an eighth lens having refractive power and comprising an image-side surface with a vertex point, wherein r is an effective radius of the image-side surface of the eighth lens, the image-side surface of the eighth lens intersects with an optical axis of the optical lens at an intersection point, the vertex point projects on the optical axis at a projection location, d is a distance between the projection location and the intersection point, and |r/d|≤30.

6 more elements

An optical lens having an optical axis, the optical lens, in order from an object side to an image-forming side, comprising:

a first lens having negative refractive power;
a second lens having negative refractive power;
a third lens having positive refractive power;
a fourth lens having positive refractive power;
a fifth lens having negative refractive power;
a sixth lens having positive refractive power;
a seventh lens having positive refractive power;
and
an eighth lens comprising an image-side surface with a vertex point, wherein r is an effective radius of the image-side surface, the image-side surface intersects with the optical axis at an intersection point, H is a distance between the vertex point and the optical axis, the vertex point projects on the optical axis at a projection location, d is a distance between the projection location and the intersection point, and |r/d|≤30 and |r/H|≤2.

6 more elements

Dependencies are inferred from the claim text.

Optical lens comprising eight lenses of −−++−++− refractive powers

Life of this patent

Optical lens comprising eight lenses of −−++−++− refractive powers

Life of this patent

Abstract

Claims20