Image system lens assembly, imaging apparatus and electronic device
AssigneeLargan Precision Co., Ltd.
InventorsKuan-Ting Yeh, Tzu-Chieh Kuo
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Abstract
An image system lens assembly includes five lens elements, the five lens elements being, in order from an object side to an image side: a first lens element; a second lens element having an object side-surface being convex in a paraxial region thereof; a third lens element having negative refractive power; a fourth lens element with positive refractive power having an image-side surface being convex in a paraxial region thereof; and a fifth lens element having negative refractive power.
Claims28
An image system lens assembly, comprising five lens elements, the five lens elements being, in order from an object side to an image side:
- a first lens element;
- a second lens element having an object side-surface being convex in a paraxial region thereof;
- a third lens element having negative refractive power;
- a fourth lens element with positive refractive power having an image-side surface being convex in a paraxial region thereof;
- and
- a fifth lens element having negative refractive power,
- wherein an axial distance between an image-side surface of the fifth lens element and an image surface is BL, 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, an axial distance between an object-side surface of the first lens element and the image surface is TL, a focal length of the image system lens assembly is f, and the following conditions are satisfied:
- 0.10<BL/T23<1.20;
- 0.10<T23/T34<7.5;
- 0<TL/f<1.0.
An image system lens assembly, comprising five lens elements, the five lens elements being, in order from an object side to an image side:
- a first lens element having positive refractive power;
- a second lens element with negative refractive power having an object side-surface being convex in a paraxial region thereof;
- a third lens element;
- a fourth lens element having positive refractive power;
- and
- a fifth lens element,
- wherein an axial distance between an image-side surface of the fifth lens element and an image surface is BL, 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, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between an object-side surface of the first lens element and the image surface is TL, a focal length of the image system lens assembly is f, a central thickness of the fifth lens element is CT5, and the following conditions are satisfied:
- 0.10<BL/T23<1.20;
- 0.10<T23/T34<5.8;
- 0<TL/f<1.0;
- 0<T45/CT5<0.57.
An image system lens assembly, comprising five lens elements, the five lens elements being, in order from an object side to an image side:
- a first lens element having an object-side surface being convex in a paraxial region;
- a second lens element with negative refractive power having an object side-surface being convex in a paraxial region thereof;
- a third lens element;
- a fourth lens element having positive refractive power;
- and
- a fifth lens element,
- wherein an axial distance between an image-side surface of the fifth lens element and an image surface is BL, 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, an axial distance between the object-side surface of the first lens element and the image surface is TL, a focal length of the image system lens assembly is f, a central thickness of the first lens element is CT1, and the following conditions are satisfied:
- 0.10<BL/T23<1.20;
- 0.65<T23/T34<5.8;
- 0<TL/f<1.0;
- 0<T12/CT1<0.43.
Dependencies are inferred from the claim text.