US 12,066,606 B2
Image lens assembly, zoom image capturing unit and electronic device
Kuan-Ting Yeh, 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. 19, 2020, as Appl. No. 17/074,372.
Claims priority of provisional application 63/059,804, filed on Jul. 31, 2020.
Prior Publication US 2022/0035141 A1, Feb. 3, 2022
Int. Cl. G02B 15/14 (2006.01); G02B 13/18 (2006.01)
CPC G02B 15/144 (2019.08) [G02B 13/18 (2013.01)] 30 Claims
OG exemplary drawing
 
1. An image lens assembly comprising four lens groups, the four lens groups being, in order from an object side to an image side along an optical path, a first lens group, a second lens group, a third lens group and a fourth lens group; the four lens groups comprising a total number of nine lens elements, the nine lens elements being, in order from the object side to the image side along the 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, an eighth lens element and a ninth lens element; the first lens group comprising the first lens element and the second lens element, the second lens group comprising the third lens element, the fourth lens element and the fifth lens element, the third lens group comprising the sixth lens element and the seventh lens element, and the fourth lens group comprising the eighth lens element and the ninth lens element;
wherein the first lens element has positive refractive power, the second lens element has negative refractive power, at least one of an object-side surface and an image-side surface of at least one lens element of the image lens assembly has at least one inflection point in an off-axis region thereof, and at least five lens elements of the image lens assembly are made of plastic material;
wherein when the image lens assembly is focusing or zooming, an axial distance between the first lens group and the fourth lens group remains a constant, an axial distance between the fourth lens group and an image surface remains a constant, while the second lens group and the third lens group move along an optical axis;
wherein when the image lens assembly is focusing or zooming, the third lens element counted from the object side moves with respect to each of two fixed lens elements that are the first lens element counted from the object side and the ninth lens element counted from the object side;
wherein a maximum value among fields of view of the image lens assembly within a zoom range is FOV_max, a minimum value among fields of view of the image lens assembly within the zoom range is FOV_min, and the following conditions are satisfied:
FOV_max<50[deg.]; and
1.25<FOV_max/FOV_min<6.0.