Patent ID: 11860447
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An imaging optical lens assembly comprising five lens elements, the five 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 and a fifth lens element, each of the five lens elements having an object-side surface facing the object side and an image-side surface facing the image side:
wherein the first lens element has positive refractive power, the second lens element has negative refractive power, and the third lens element has negative refractive power;
wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the imaging optical lens assembly is f, an Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, an entrance pupil diameter of the imaging optical lens assembly is EPD, a central thickness of the first lens element is CT1, a central thickness of the fourth lens element is CT4, and the following conditions are satisfied:

0.50<TL/f<1.0;

10.0<V4+V5<45.0;

0.15<T23/(T12+T34+T45);

0.50<f/EPD<2.40; and

0.08<CT4/CT1<0.25.