Patent ID: 11921260
Assignee: SINTAI OPTICAL (SHENZHEN) CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. The lens assembly as claimed in claim 1, wherein:
the second lens is a meniscus lens with negative refractive power and comprises a convex surface facing the object side and a concave surface facing the image side;
the third lens is with positive refractive power and comprises a convex surface facing the object side; and
the lens assembly satisfies at least one of following conditions:

1.2<f/D1<2.5;

−10<F×((f1−f6)/(T5+T6−R62+R52))<−3;

−5<(f1−f6)/(T5+T6−R62+R52)<−1;

1.3 mm<(f1−f6)/((T5+T6)/G5)<5 mm;

3<D1/T6<9

−3.5<(f1+f5+f6)/(T5+T6−R62+R52)<−1.5;

wherein G5 is the air interval from the convex surface of the fifth lens to the object side surface of the sixth lens along the optical axis, D1 is an effective optical diameter of the convex surface of the first lens, f is an effective focal length of the lens assembly, f1 is an effective focal length of the first lens, f6 is an effective focal length of the sixth lens, f5 is an effective focal length of the fifth lens, T5 is the thickness of the fifth lens along the optical axis, R52 is the radius of curvature of the convex surface of the fifth lens, R62 is the radius of curvature of the concave surface of the sixth lens, and F is a F-number of the lens assembly.