US 11,947,088 B2
Imaging optical lens assembly including nine lenses of -++-++-, ++-++--+-, -+-++--+-, -+-++-++-, +--++--+- or +--++-++-++—refractive powers, image capturing unit and electronic device
Wei-Yu Chen, Taichung (TW)
Assigned to LARGAN PRECISION CO., LTD., Taichung (TW)
Filed by LARGAN PRECISION CO., LTD., Taichung (TW)
Filed on Jan. 24, 2023, as Appl. No. 18/101,029.
Application 18/101,029 is a continuation of application No. 16/991,973, filed on Aug. 12, 2020, granted, now 11,598,935.
Claims priority of application No. 109116712 (TW), filed on May 20, 2020.
Prior Publication US 2023/0161139 A1, May 25, 2023
Int. Cl. G02B 13/00 (2006.01); G02B 9/64 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/64 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An imaging optical lens assembly comprising nine lens elements, and the nine 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, an eighth lens element and a ninth lens element;
wherein the first lens element has an object-side surface being concave in a paraxial region thereof, the object-side surface of the first lens element has at least one convex critical point in an off-region thereof, and an absolute value of a focal length of the second lens element is larger than an absolute value of a focal length of the first lens element;
wherein an axial distance between the object-side surface of the first lens element and an image-side surface of the ninth lens element is Td, a sum of central thicknesses of all lens elements of the imaging optical lens assembly is ΣCT, a curvature radius of an object-side surface of the eighth lens element is R15, a curvature radius of an image-side surface of the eighth lens element is R16, 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 imaging optical lens assembly is ImgH, and the following conditions are satisfied:
Td/ΣCT<1.80;
−0.50<(R15+R16)/(R15−R16); and
TL/ImgH<3.0.