Lens Assembly
AssigneesSintai Optical (Shenzhen) Co., Ltd., Asia Optical Co., Inc.
InventorsBo-Yan Chen, Hsi-Ling Chang
Life of this patent
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Abstract
A lens assembly comprises sequentially from an object side to an image side along an optical axis a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens is with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens is with refractive power. The third lens is a biconvex lens with positive refractive power. The fourth lens is with refractive power and includes a convex surface facing the image side. The fifth lens is a biconvex lens with positive refractive power. The sixth lens is with negative refractive power and includes a concave surface facing the object side. The seventh lens is a meniscus lens with refractive power.
Claims20
A lens assembly, in sequence from an object side to an image side along an optical axis, comprising:
- a first lens which is with negative refractive power and comprises a convex surface facing the object side and a concave surface facing the image side;
- a second lens which is with refractive power;
- a third lens which is a biconvex lens with positive refractive power;
- a fourth lens which is with refractive power and comprises a convex surface facing the image side;
- a fifth lens which is a biconvex lens with positive refractive power;
- a sixth lens which is with negative refractive power and comprises a concave surface facing the object side;
- and
- a seventh lens which is a meniscus lens with refractive power;
- wherein the lens assembly satisfies the following condition:
- 34<Vd5−Vd6<66,
- wherein Vd5 is an Abbe number of the fifth lens and Vd6 is an Abbe number of the sixth lens.
A lens assembly, in sequence from an object side to an image side along an optical axis, comprising:
- a first lens which is with negative refractive power and comprises a convex surface facing the object side and a concave surface facing the image side;
- a second lens which is with refractive power;
- a third lens which is a biconvex lens with positive refractive power;
- a fourth lens which is with refractive power and comprises a convex surface facing the image side;
- a sixth lens which is with negative refractive power and comprises a concave surface facing the object side;
- and
- a seventh lens which is a meniscus lens with refractive power;
- wherein the lens assembly satisfies the following condition:
- 20 mm2<f3×f5<30 mm2,
- wherein f3 is an effective focal length of the third lens and f5 is an effective focal length of the fifth lens.
A lens assembly, in sequence from an object side to an image side along an optical axis, comprising:
- a first lens which is with negative refractive power and comprises a convex surface facing the object side and a concave surface facing the image side;
- a second lens which is with refractive power;
- a third lens which is a biconvex lens with positive refractive power;
- a fourth lens which is with refractive power and comprises a convex surface facing the image side;
- a fifth lens which is a biconvex lens with positive refractive power;
- a sixth lens which is with negative refractive power and comprises a concave surface facing the object side;
- and
- a seventh lens which is a meniscus lens with refractive power;
- wherein the lens assembly satisfies the following condition:
- 2.5<Vd5/Vd6<4.5,
- wherein Vd5 is an Abbe number of the fifth lens and Vd6 is an Abbe number of the sixth lens.
Dependencies are inferred from the claim text.