US 12,216,255 B2
Photographing optical lens assembly including eight lenses of +−+−−++−, +−++−++−, ++++−++− or +−+−+−+−refractive powers, imaging apparatus and electronic device
Yu-Tai Tseng, Taichung (TW); and Tzu-Chieh Kuo, Taichung (TW)
Assigned to LARGAN PRECISION CO., LTD., Taichung (TW)
Filed by LARGAN PRECISION CO., LTD., Taichung (TW)
Filed on Mar. 4, 2024, as Appl. No. 18/594,059.
Application 18/594,059 is a continuation of application No. 18/052,596, filed on Nov. 4, 2022, granted, now 11,953,657.
Application 18/052,596 is a continuation of application No. 16/942,922, filed on Jul. 30, 2020, granted, now 11,531,191, issued on Dec. 20, 2022.
Claims priority of application No. 109102020 (TW), filed on Jan. 20, 2020.
Prior Publication US 2024/0248285 A1, Jul. 25, 2024
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A photographing optical lens assembly comprising eight lens elements, the eight lens elements being, in order from an object side to an image side along an optical path:
a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element; each of the eight lens elements has an object-side surface towards the object side and an image-side surface towards the image side;
wherein the first lens element has positive refractive power; the image-side surface of the second lens element is concave in a paraxial region thereof; the third lens element has positive refractive power; the image-side surface of the fourth lens element is convex in a paraxial region thereof; the seventh lens element has positive refractive power, the object-side surface of the seventh lens element is convex in a paraxial region thereof, the image-side surface of the seventh lens element is concave in a paraxial region thereof; the eighth lens element has negative refractive power, the image-side surface of the eighth lens element is concave in a paraxial region thereof; at least one of the object-side surface and the image-side surface of at least one of the eight lens elements comprises at least one critical point in an off-axis region thereof;
wherein an Abbe number of the sixth lens element is V6, a curvature radius of the object-side surface of the eighth lens element is R15, a curvature radius of the image-side surface of the eighth lens element is R16, a focal length of the photographing optical lens assembly is f, a focal length of the third lens element is f3, a focal length of the seventh lens element is f7, a focal length of the eighth lens element is f8, and the following conditions are satisfied:
35.0<V6<60.0;
0.30<(R15+R16)/(R15−R16);
−1.8<f/f8<−1.0; and
0.50<f3/f7<5.0.