CPC G02B 13/004 (2013.01) [G02B 9/34 (2013.01)] | 20 Claims |
1. An optical imaging lens, from an object side to an image side in order along an optical axis comprising: four lens elements, the four lens elements include a first lens element, a second lens element, a third lens element and a fourth lens element, the first lens element to the fourth lens element each having an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through, wherein:
an optical axis region of the object-side surface of the second lens element is convex, or a periphery region of the object-side surface of the second lens element is convex;
a periphery region of the image-side surface of the second lens element is convex;
an optical axis region of the image-side surface of the fourth lens element is convex;
lens elements included by the optical imaging lens are only the four lens elements described above, wherein HFOV is a half field of view of the optical imaging lens, EFL is an effective focal length of the optical imaging lens, TL is a distance from the object-side surface of the first lens element to the image-side surface of the fourth lens element along the optical axis, and the optical imaging lens satisfies the relationship: HFOV/(EFL+TL)≥35.000 degrees/mm, wherein the lens element includes at least one transition point, the line tangent to the transition point is perpendicular to the optical axis, when a surface of the lens element has at least one transition point, the periphery region is defined as a region located radially outside of the farthest transition point from the optical axis to an optical boundary of the surface of the lens element, and when a surface of the lens element has no transition point, the periphery region is defined as a region of 50%-100% of the distance between the optical axis and the optical boundary of the surface of the lens element.
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