Image capturing optical system, image capturing device and electronic device
AssigneeLargan Precision Co., Ltd.
InventorsKuan-Ming Chen, Wei-Yu Chen
Life of this patent
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Abstract
The present disclosure provides an image capturing optical system comprising: a positive first lens element having a convex object-side surface; a negative second lens element having a concave object-side surface; a third lens element; a fourth lens element having a convex object-side surface and a concave image-side surface, the object-side surface and the image-side surface thereof being aspheric; a fifth lens element having a concave image-side surface concave, both of the object-side surface and the image-side surface being aspheric, at least one of the object-side surface and the image-side surface having at least one convex shape in an off-axis region thereof.
Claims20
An image capturing optical system, comprising five lens elements, the five lens elements in order from an object side to an image side comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element:
- wherein the first lens element has an image-side surface being convex in a paraxial region thereof;
- the fourth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof;
- and the fifth lens element has an image-side surface being concave in a paraxial region thereof;
- wherein there is an air gap between each of adjacent lens elements of the image capturing optical system, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the fourth lens element is f4, a maximum among refractive indexes of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element is Nmax, and the following conditions are satisfied:
- −1.0<f2/f1<0;
- 1.50<Nmax<1.75;
- and
- |f2|<|f4|.
An image capturing optical system, comprising five lens elements, the five lens elements in order from an object side to an image side comprising a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element:
- wherein the first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof;
- the second lens element has negative refractive power;
- the fourth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof;
- and the fifth lens element has an image-side surface being concave in a paraxial region thereof;
- wherein there is an air gap between each of adjacent lens elements of the image capturing optical system, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the fifth lens element is f5, and the following conditions are satisfied:
- −1.0<f2/f1<0;
- and
- |f2|<|f5|.
Dependencies are inferred from the claim text.