Imaging lens system, identification module and electronic device
AssigneeLargan Precision Co., Ltd.
InventorsKuan-Ting YEH, Hsin-Hsuan HUANG
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Abstract
An imaging 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, and 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. The first lens element has negative refractive power. The fourth lens element has positive refractive power, and the image-side surface of the fourth lens element is convex in a paraxial region thereof. At least one lens element of the imaging lens system has at least one lens surface having at least one inflection point.
Claims26
An imaging lens system comprising four lens elements, the four lens elements being, 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 having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
- wherein the object-side surface of the first lens element is convex in a paraxial region thereof, the second lens element has positive refractive power, the object-side surface of the second lens element is convex in a paraxial region thereof, the object-side surface of the third lens element is convex in a paraxial region thereof, at least one lens element of the imaging lens system is made of plastic material and has at least one aspheric surface, a central thickness of the first lens element is a maximum value among central thicknesses of all lens elements of the imaging lens system, and a central thickness of the third lens element is larger than an axial distance between the second lens element and the third lens element;
- wherein 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 lens system is ImgH, and the following condition is satisfied:
- 5.0<TL/ImgH<8.0.
An imaging lens system comprising four lens elements, the four lens elements being, 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 having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
- wherein the object-side surface of the first lens element is convex in a paraxial region thereof, the second lens element has positive refractive power, the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof, the object-side surface of the third lens element is convex in a paraxial region thereof, a central thickness of the first lens element is a maximum value among central thicknesses of all lens elements of the imaging lens system, a central thickness of the fourth lens element is larger than an axial distance between the second lens element and the third lens element, and a central thickness of the second lens element is larger than an axial distance between the third lens element and the fourth lens element;
- wherein 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 lens system is ImgH, and the following condition is satisfied:
- 5.0<TL/ImgH<10.0.
An imaging lens system comprising four lens elements, the four lens elements being, 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 having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
- wherein the object-side surface of the first lens element is convex in a paraxial region thereof, the second lens element has positive refractive power, the object-side surface of the third lens element is convex in a paraxial region thereof, at least one lens element of the imaging lens system has at least one lens surface having at least one inflection point, and a central thickness of the first lens element is a maximum value among central thicknesses of all lens elements of the imaging lens system;
- wherein 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 lens system is ImgH, a focal length of the first lens element is f1, a focal length of the third lens element is f3, and the following conditions are satisfied:
- 5.0<TL/ImgH<8.0;
- and
- |f1|<|f3|.
Dependencies are inferred from the claim text.