Optical imaging system
AssigneeLargan Precision Co., Ltd.
InventorsChun-Shan CHEN, Tsung-Han TSAI, Hsin-Hsuan HUANG
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Abstract
An optical imaging system includes, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element, a third lens element, a fourth lens element, and a fifth lens element. Each of the fourth lens element and the fifth lens element includes at least one aspheric surface. The fourth lens element and the fifth lens element are made of plastic. The fifth lens element includes a concave image-side surface and at least one inflection point. An axial distance is formed between each of the first lens element, the second lens element, the third lens element, the fourth lens element, and the fifth lens element, and the optical imaging system further comprises a stop.
Claims24
An optical imaging system 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 with negative refractive power having an image-side surface being concave in a paraxial region thereof;
- a fourth lens element having positive refractive power;
- and
- a fifth lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fifth lens element is aspheric, and the image-side surface of the fifth lens element has at least one inflection point;
- wherein an Abbe number of the first lens element is V1, an Abbe number of the third lens element is V3, a radius of curvature of the image-side surface of the fifth lens element is R10, a focal length of the optical imaging system is f, and the following conditions are satisfied:
- 29<V1−V3<45;
- and
- 0.1<R10/f<0.5.
An optical imaging system 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;
- a third lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof;
- a fourth lens element having positive refractive power;
- and
- a fifth lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fifth lens element is aspheric, and the image-side surface of the fifth lens element has at least one inflection point;
- wherein the optical imaging system further comprises an aperture stop disposed between the first lens element and the second lens element, an Abbe number of the first lens element is V1, an Abbe number of the third lens element is V3, a radius of curvature of the image-side surface of the fifth lens element is R10, a focal length of the optical imaging system is f, and the following conditions are satisfied:
- 29<V1−V3<45;
- and
- 0.1<R10/f<0.5.
An optical imaging system 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 image-side surface being convex in a paraxial region thereof;
- a third lens element with negative refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof;
- a fourth lens element having positive refractive power;
- and
- a fifth lens element with negative refractive power having an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the fifth lens element is aspheric, and the image-side surface of the fifth lens element has at least one inflection point;
- wherein an Abbe number of the first lens element is V1, an Abbe number of the third lens element is V3, and the following condition is satisfied:
- 29<V1−V3<45.
Dependencies are inferred from the claim text.