US 12,259,529 B2
Lens assembly
An-Kai Chang, Taichung (TW)
Assigned to SINTAI OPTICAL (SHENZHEN) CO., LTD., Shenzhen (CN); and ASI OPTICAL CO., INC., Taichung (TW)
Filed by Sintai Optical (Shenzhen) Co., Ltd., ShenZhen (CN); and Asia Optical Co., Inc., Taichung (TW)
Filed on Dec. 20, 2021, as Appl. No. 17/555,966.
Claims priority of application No. 110102123 (TW), filed on Jan. 20, 2021.
Prior Publication US 2022/0229274 A1, Jul. 21, 2022
Int. Cl. G02B 9/64 (2006.01); G02B 13/00 (2006.01); G02B 27/00 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01); G02B 27/0025 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A lens assembly, comprising:
a first lens, a second lens, a third lens, a fourth lens, a sixth lens, a seventh lens and an eighth lens; wherein
the first lens is a meniscus lens with negative refractive power and comprises a convex surface facing an object side and a concave surface facing an image side;
the second lens is with negative refractive power;
the third lens is with refractive power;
the fourth lens is with positive refractive power;
the fifth lens with positive refractive power comprises a convex surface facing the image side;
the sixth lens is with positive refractive power;
the seventh lens is with positive refractive power;
the eighth lens with negative refractive power comprises a concave surface facing the object side; and
the first lens, the second lens, the third lens, the fourth lens, the sixth lens, the seventh lens and the eighth lens are arranged sequentially from the object side to the image side along an optical axis;
wherein the lens assembly satisfies at least one of the following conditions:
0.05<GAP5678/T5678<0.25,
−2.0<f1/f<−1.7,
1.0<D1/D7<1.1,
0.02<GAP5678/TTL<0.06,
wherein GAP5678 is a sum of an air interval from the fifth lens to the eighth lens along the optical axis, T5678 is a sum of a lens thickness of the fifth lens to the eighth lens along the optical axis, f1 is an effective focal length of the first lens, f is an effective focal length of the lens assembly, D1 is a larger one of optical effective diameter of the objective surface and the image surface of the first lens, D7 is a larger one of optical effective diameter of the objective surface and the image surface of the seventh lens, and TTL is an interval from the objective surface of the first lens to an image plane along the optical axis.