An optical imaging lens including a front lens element group, a minimum-aperture light-shielding sheet and a rear lens element group sequentially arranged along an optical axis from an object side to an image side is provided. The front lens element group includes a first lens element. The first lens element includes a first surface facing the object side and a second surface facing the image side. The first surface includes an object-side surface allowing imaging rays to pass through and a non-optical effective area. The second surface includes an image-side surface allowing imaging rays to pass through and a non-optical effective area. The optical imaging lens further includes a light-absorbing layer disposed on the non-optical effective area of the second surface and an optical film disposed on a first surface of the minimum-aperture light-shielding sheet. The optical imaging lens satisfies the conditions of 2.200≤RLavg/RS0avg and RLavg≤3.000%.

An electronic device includes at least one optical lens assembly. The optical lens assembly includes four lens elements, and the four lens elements are, in order from an outside to an inside, a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has an outside surface being convex in a paraxial region thereof. The second lens element has an inside surface being convex in a paraxial region thereof. The fourth lens element has an inside surface being concave in a paraxial region thereof, wherein at least one of an outside surface and the inside surface of the fourth lens element includes at least one critical point in an off-axis region thereof.

A zoom lens includes a negative first lens group, a positive second lens group, and a subsequent lens group in order from an object side. A focusing lens group closer to an image side than the first lens group moves during focusing. The first lens group consists of a first-a lens group and a first-b lens group in order from the object side. Assuming that an average of refractive indices of the negative lenses of the first-a lens group is Nd1ave, a focal length of the focusing lens group is ff, and a focal length of the first lens group is f1, Conditional Expression (1) of 1.73<Nd1ave<1.95 and Conditional Expression (2) of 1<|ff/f1|<3 are satisfied.

A lens system includes four lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element and a fourth lens element. Each of the four lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one of the object-side surface and the image-side surface of the first lens element has at least one inflection point. The fourth lens element has positive refractive power, the object-side surface of the fourth lens element is convex in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the fourth lens element has at least one inflection point.

A lens system includes four lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element and a fourth lens element. Each of the four lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. At least one of the object-side surface and the image-side surface of the first lens element has at least one inflection point. The fourth lens element has positive refractive power, the object-side surface of the fourth lens element is convex in a paraxial region thereof, and at least one of the object-side surface and the image-side surface of the fourth lens element has at least one inflection point.

An optical system includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power. During focusing, the first lens unit and the fourth lens unit are fixed, and the second lens unit and the third lens unit are moved. The first lens unit includes a positive lens disposed closest to an object. The fourth lens unit includes a negative lens disposed closest to an image plane.

An optical system includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive refractive power, and a fourth lens unit having positive refractive power. During focusing, the first lens unit and the fourth lens unit are fixed, and the second lens unit and the third lens unit are moved. The first lens unit includes a positive lens disposed closest to an object. The fourth lens unit includes a negative lens disposed closest to an image plane.

Provided is a camera optical lens including first to fourth lenses. The camera optical lens satisfies: 0.10≤R1/R2≤0.20; 1.10≤R3/R4≤1.50; 5.50≤R5/R6≤6.50; and −6.50≤f2/f≤−4.50, where f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R1 denotes a curvature radius of an object side surface of the first lens; R2 denotes a curvature radius of an image side surface of the first lens; R3 denotes a curvature radius of an object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; R5 denotes a curvature radius of an object side surface of the third lens; and R6 denotes a curvature radius of an image side surface of the third lens. The camera optical lens has good optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures.

Provided is a camera optical lens including first to fourth lenses. The camera optical lens satisfies: 0.10≤R1/R2≤0.20; 1.10≤R3/R4≤1.50; 5.50≤R5/R6≤6.50; and −6.50≤f2/f≤−4.50, where f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R1 denotes a curvature radius of an object side surface of the first lens; R2 denotes a curvature radius of an image side surface of the first lens; R3 denotes a curvature radius of an object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; R5 denotes a curvature radius of an object side surface of the third lens; and R6 denotes a curvature radius of an image side surface of the third lens. The camera optical lens has good optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having large apertures.

An optical imaging lens system includes four lens elements arranged along an optical axis. The optical imaging lens system satisfies the relations 2.13°≤HFOV/Fno≤8.75°; 3.85≤TTL/T1≤7.00; and 0.8≤AC34/T3, where a half field of view of the optical imaging lens system is defined as HFOV, an F number of the optical imaging lens system is defined as Fno, a distance measured from the object-side surface of the first lens element to an image plane along the optical axis is defined as TTL, a thickness of the first lens element along the optical axis is defined as T1, an air gap between the third and fourth lens elements along the optical axis is defined as AC34, a thickness of the third lens element along the optical axis is defined as T3.