US 12,169,265 B2
Photographing optical lens system, image capturing unit and electronic device including seven lenses of +−+−+−−, +−+−−+−, −+−+−+−, ++−+−+−, or ++−−−+− refractive powers
Tzu-Chieh Kuo, Taichung (TW); and Wei-Yu Chen, Taichung (TW)
Assigned to LARGAN PRECISION CO., LTD., Taichung (TW)
Filed by LARGAN PRECISION CO., LTD., Taichung (TW)
Filed on Oct. 23, 2020, as Appl. No. 17/079,068.
Application 17/079,068 is a continuation of application No. 16/133,001, filed on Sep. 17, 2018, granted, now 10,852,513.
Claims priority of application No. 107111127 (TW), filed on Mar. 30, 2018.
Prior Publication US 2021/0041674 A1, Feb. 11, 2021
Int. Cl. G02B 13/00 (2006.01); G02B 3/04 (2006.01); G02B 9/64 (2006.01); G02B 13/18 (2006.01); G02B 27/00 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 3/04 (2013.01); G02B 9/64 (2013.01); G02B 13/18 (2013.01); G02B 27/0025 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A photographing optical lens system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element; each of the seven lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the first lens element has positive refractive power, the image-side surface of the sixth lens element is concave in a paraxial region thereof, the object-side surface of the seventh lens element is concave in a paraxial region thereof, and at least one of object-side and image-side surfaces of the seven lens elements is aspheric and has at least one inflection point;
wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, a maximum image height of the photographing optical lens system is ImgH, a number of lens elements having an Abbe number smaller than 20 among the seven lens elements is V20, a focal length of the photographing optical lens system is f, a focal length of the fourth lens element is f4, and the following conditions are satisfied:
TL/ImgH<1.75;
2≤V20; and
−10.0<f4/f≤0.