Image capturing optical system, imaging apparatus and electronic device
AssigneeLargan Precision Co., Ltd.
InventorsPo-Lun Hsu, Hsin-Hsuan Huang
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Abstract
An image capturing optical system includes seven lens elements, the seven 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, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. An image-side surface of the fifth lens element is convex in a paraxial region thereof. An image-side surface of the sixth lens element is concave in a paraxial region thereof. The seventh lens element has negative refractive power.
Claims30
An image capturing optical system comprising seven lens elements, the seven 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, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element;
- wherein each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side;
- wherein an image-side surface of the fifth lens element is convex in a paraxial region thereof;
- an image-side surface of the sixth lens element is concave in a paraxial region thereof;
- the seventh lens element has negative refractive power;
- an object-side surface of the seventh lens element is convex in a paraxial region thereof;
- wherein each of at least three of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has at least one surface being aspheric, and at least one surface of at least one of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element comprises at least one inflection point;
- wherein an axial distance between the first lens element and the second lens element is smaller than an axial distance between the second lens element and the third lens element;
- wherein an axial distance between an object-side surface of the first lens element and an image surface is TL, an entrance pupil diameter of the image capturing optical system is EPD, a focal length of the first lens element is f1, a focal length of the third lens element is f3, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, a curvature radius of the object-side surface of the seventh lens element is R13, a curvature radius of an image-side surface of the seventh lens element is R14, and the following conditions are satisfied:
- 1.05<TL/EPD<2.38;
- −1.50<f3/f1<1.55;
- −0.70<R14/R13<1.40;
- and
- |R5/R6|<4.50.
An image capturing optical system comprising seven lens elements, the seven 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, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element;
- wherein each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side;
- wherein the second lens element has negative refractive power;
- the fifth lens element has positive refractive power;
- an image-side surface of the sixth lens element is concave in a paraxial region thereof;
- the seventh lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof;
- wherein each of at least three of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has at least one surface being aspheric, and at least one surface of at least one of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element comprises at least one inflection point;
- wherein an axial distance between an object-side surface of the first lens element and an image surface is TL, a curvature radius of the image-side surface of the seventh lens element is R14, an entrance pupil diameter of the image capturing optical system is EPD, 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:
- 1.05<TL/EPD<2.38;
- 0.10<R14/EPD<1.0;
- and
- −7.0<f3/f1<1.55.
Dependencies are inferred from the claim text.