Image lens assembly and image apparatus
AssigneeLargan Precision Co., Ltd.
InventorTzu-Chieh Kuo
Life of this patent
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Abstract
An image lens assembly includes six lens elements, and the six lens elements are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. Each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element with negative refractive power has the image-side surface being concave in a paraxial region thereof. The second lens element has negative refractive power. At least one surface of at least one of the six lens elements includes at least one inflection point.
Claims20
An image lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side along an optical path:
- a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element;
- each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side;
- wherein a total number of the lens elements in the image lens assembly is six, the first lens element with negative refractive power has the image-side surface being concave in a paraxial region thereof;
- the second lens element has negative refractive power;
- the fourth lens element has the image-side surface being convex in a paraxial region thereof;
- the fifth lens element has the object-side surface being convex in a paraxial region thereof;
- the sixth lens element has negative refractive power;
- wherein at least one surface of at least one of the six lens elements comprises at least one inflection point;
- wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, and the following conditions are satisfied:
- 0<f1/f2<2.0;
- 1.6<T12/(CT1+CT2);
- and
- 1.1<T23/T34<5.0.
An image lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side along an optical path:
- a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element;
- each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side;
- wherein a total number of the lens elements in the image lens assembly is six, the first lens element with negative refractive power has the image-side surface being concave in a paraxial region thereof;
- the second lens element with negative refractive power has the image-side surface being concave in a paraxial region thereof;
- the fourth lens element has positive refractive power;
- the sixth lens element has the object-side surface being concave in a paraxial region thereof;
- wherein at least one surface of at least one of the six lens elements comprises at least one inflection point;
- wherein a focal length of the first lens element is f1, a focal length of the second lens element is f2, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, and the following conditions are satisfied:
- 0<f1/f2<2.0;
- 1.9<T12/(CT1+CT2);
- and
- 1.1<T23/T34<5.0.
Dependencies are inferred from the claim text.