CN-121995601-A - Lens and optical imaging system

Abstract

The present disclosure relates to a lens in which a first profile in a first direction intersecting an optical axis and a second profile in a second direction intersecting the optical axis are different from each other, and a length of the first profile in the first direction is different from a length of the second profile in the second direction, and an optical imaging system.

Inventors

• Xu Zaihe
• ZHAO YONGZHU
• Kang Yongxi
• Zheng Bigao

Assignees

• 三星电机株式会社

Dates

Publication Date

20260508

Application Date

20210727

Priority Date

20201228

Claims (15)

1. 1. An optical imaging system, comprising: a first lens having positive refractive power; A second lens having a negative refractive power, and A third lens having a positive refractive power, Wherein the first lens to the third lens are sequentially arranged from an object side toward an imaging surface of the optical imaging system, Wherein the optical imaging system includes three lenses having refractive power in total, and Wherein the third lens is an anamorphic lens, and a first profile of the anamorphic lens in a first direction intersecting an optical axis and a second profile of the anamorphic lens in a second direction intersecting the optical axis are different from each other.
2. 2. The optical imaging system of claim 1, wherein the first lens has a convex object side.
3. 3. The optical imaging system of claim 1, wherein the second lens has a convex object side.
4. 4. The optical imaging system of claim 1, wherein the third lens has a convex image side.
5. 5. An optical imaging system, comprising: a first lens having positive refractive power; a second lens having a negative refractive power; a third lens having positive refractive power, and A fourth lens having a negative refractive power, Wherein the first lens to the fourth lens are sequentially arranged from an object side toward an imaging surface of the optical imaging system, Wherein the optical imaging system includes four lenses having refractive power in total, and Wherein each of the second lens and the fourth lens is an anamorphic lens, a first profile of the anamorphic lens in a first direction intersecting an optical axis and a second profile of the anamorphic lens in a second direction intersecting the optical axis being different from each other.
6. 6. The optical imaging system of claim 5, wherein the first lens has a convex object side.
7. 7. The optical imaging system of claim 5, wherein the second lens has a concave object side.
8. 8. The optical imaging system of claim 5, wherein the third lens has a convex object side.
9. 9. The optical imaging system of claim 5, wherein the fourth lens has a concave image side.
10. 10. An optical imaging system, comprising: a first lens having positive refractive power; a second lens having a negative refractive power; a third lens having positive refractive power; A fourth lens having negative refractive power, and A fifth lens having a positive refractive power, Wherein the first lens to the fifth lens are sequentially arranged from an object side toward an imaging surface of the optical imaging system, Wherein the optical imaging system includes five lenses having refractive power in total, and Wherein the fourth lens is an anamorphic lens, and a first profile of the anamorphic lens in a first direction intersecting an optical axis and a second profile of the anamorphic lens in a second direction intersecting the optical axis are different from each other.
11. 11. The optical imaging system of claim 10, wherein the first lens has a convex object side.
12. 12. The optical imaging system of claim 10, wherein the second lens has a concave image side.
13. 13. The optical imaging system of claim 10, wherein the third lens has a convex object side.
14. 14. The optical imaging system of claim 10, wherein the fourth lens has a concave image side.
15. 15. The optical imaging system of claim 10, wherein the fifth lens has a concave image side.

Description

Lens and optical imaging system Cross Reference to Related Applications The present application claims the benefit of priority from korean patent application No. 10-2020-0184433 filed in korean intellectual property office on 12 months 28 of 2020, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field The present disclosure relates to a lens configured to improve resolution degradation and an optical imaging system including the lens. Background Portable electronic devices may generally include a camera module. For example, portable electronic devices such as smart phones and notebook computers include camera modules. The optical imaging system of the camera module may include a plurality of lenses to improve the resolution of the camera module. For example, the optical imaging system includes three or more lenses. The optical imaging system may include lenses that enable thinner or smaller camera modules. For example, the optical imaging system includes a lens in which the X-direction and the Y-direction are asymmetric. However, the above-described lens may have optical characteristics in the X direction and optical characteristics in the Y direction different from the initial design value due to the asymmetric shape. The above information is presented merely as background information to aid in the understanding of the present disclosure. No determination is made, nor an assertion is made, as to whether any of the above may be used as prior art with respect to the present disclosure. Disclosure of Invention This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. In one general aspect, a lens in which a first profile in a first direction intersecting an optical axis and a second profile in a second direction intersecting the optical axis are different from each other, and a length of the first profile in the first direction is different from a length of the second profile in the second direction. The radius of curvature Rx1 of the object side of the first profile and the radius of curvature Ry1 of the object side of the second profile may be different from each other. The | (Rx 1-Ry 1)/Ry1| can be greater than 0 and less than 0.5. The | (Rx 1-Ry 1)/Rx2| may be greater than 0.2 and less than 2.0, where Rx2 is the radius of curvature of the image side of the first profile. The i fx-fy i may be greater than 0 and less than 0.5mm, where fx is the focal length of the lens calculated based on the radius of curvature of the first profile and fy is the focal length of the lens calculated based on the radius of curvature of the second profile. The | (fx-fy)/fx| can be greater than 0 and less than 0.01. In another general aspect, an optical imaging system includes three or more lenses disposed on an optical axis, wherein one or more of the three or more lenses includes one or more anamorphic lenses, each anamorphic lens having a first profile in a first direction intersecting the optical axis and a second profile in a second direction intersecting the optical axis, the first profile and the second profile being different from each other, and a length of the first profile in the first direction being different from a length of the second profile in the second direction. The three or more lenses may include a first lens, a second lens, and a third lens arranged in order from the object side, and the third lens may be an anamorphic lens of the one or more anamorphic lenses, or the three or more lenses may include a first lens, a second lens, a third lens, and a fourth lens arranged in order from the object side, and the second lens and the fourth lens may be anamorphic lenses of the one or more anamorphic lenses, or the three or more lenses may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in order from the object side, and the fourth lens or the second lens and the fourth lens may be anamorphic lenses of the one or more anamorphic lenses. When the second lens and the fourth lens may be anamorphic lenses, the second lens has a shape in which a radius of curvature of the object side surface in the first direction is larger than a radius of curvature of the object side surface in the second direction, and the fourth lens has a shape in which a radius of curvature of the object side surface in the first direction is smaller than a radius of curvature of the object side surface in the second direction. The first lens may have a positive refractive power, the second lens may have a negative refractive power, and the third lens may have a positive refractive power. In another general aspect, an optical imaging system includes an anamorphic lens incl