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US-12625348-B2 - Optical lens, lens module, and terminal

US12625348B2US 12625348 B2US12625348 B2US 12625348B2US-12625348-B2

Abstract

An optical lens includes a first constituent element, a second constituent element, a third constituent element, and a fourth constituent element arranged from an object side to an image side, and each of the constituent elements includes at least one lens element. The optical lens satisfies the following relations: 9.08≤BFL≤11.745; and 0.6≤BFL/TTL≤0.67. In this way, the optical lens can obtain a long back focal length (BFL) and long-focus photographing of the optical lens is implemented. In addition, an axial thickness (TTL1) of a plurality of lenses of the optical lens is small to make a thickness of the terminal including the optical lens to be small.

Inventors

  • Yita CHIANG
  • Zhantao Li
  • Rongkai FENG

Assignees

  • HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date
20260512
Application Date
20221104
Priority Date
20200506

Claims (20)

  1. 1 . An optical lens comprising: an object side; an image side; and a plurality of constituent elements comprising: a first constituent element having a positive refractive power and comprising a first lens element; a second constituent element having a negative refractive power; a third constituent element; and a fourth constituent element, wherein the first constituent element, the second constituent element, the third constituent element, and the fourth constituent element are arranged from the object side to the image side, wherein each of the constituent elements comprises at least one lens element, wherein each of the at least one lens element comprises: an object side surface facing the object side; and an image side surface facing the image side, wherein the optical lens satisfies the following relations: 0.432≤ f S1 /f≤ 0.689, wherein f S1 is a first focal length of the first lens element, and wherein f is a total focal length of the optical lens; 9.08≤BFL≤11.745; and 0.6≤BFL/TTL≤0.67, wherein BFL is a back focal length of the optical lens, and wherein the TTL is a total track length of the optical lens.
  2. 2 . The optical lens of claim 1 , wherein the first lens element has a positive refractive power, and wherein the first lens element comprises: a first object side surface that is convex near an axis; and a first image side surface that is convex or concave near the axis.
  3. 3 . The optical lens of claim 2 , wherein the optical lens further satisfies the following relations: −0.345≤ R S11 /R S12 <0 or 0< R S11 /R S12 ≤0.348; and 0.2≤ d S1 /Σd≤ 0.4, wherein R S11 is a first curvature radius of the first object side surface, wherein R S12 is a second curvature radius of the first image side surface, wherein d S1 is a first axial thickness of the first lens element, and wherein Σd is a sum of axial thicknesses of all lens elements in the constituent elements.
  4. 4 . The optical lens of claim 1 , wherein the second constituent element comprises a second lens element having a negative refractive power, wherein the second lens element comprises: a second object side surface that is convex near an axis; and a second image side surface that is concave near the axis, wherein the optical lens further satisfies the following relation: −7.559≤ f S2 /f≤− 0.494, wherein f S2 is a second focal length of the second lens element.
  5. 5 . The optical lens of claim 4 , wherein the optical lens further satisfies the following relations: 1< R S21 /R S22 ≤3; and 0.1≤ d S2 /Σd≤ 0.2, wherein R S21 is a third curvature radius of the second object side surface, wherein R S22 is a fourth curvature radius of the second image side surface, wherein d S2 is a second axial thickness of the second lens element, and wherein Σd is a sum of axial thicknesses of all lens elements in the constituent elements.
  6. 6 . The optical lens of claim 1 , wherein the third constituent element comprises a third lens element having a positive refractive power or negative refractive power, wherein the third lens element comprises: a third object side surface that is convex or concave near the axis; and a third image side surface that is convex near the axis, wherein the optical lens further satisfies the following relation: −15.2≤ f S3 /f≤ 7.3, wherein f S3 is a third focal length of the third lens element.
  7. 7 . The optical lens of claim 6 , wherein the optical lens further satisfies the following relations: 0.66≤ R S31 /R S32 <1.0; and 0.1≤ d S3 /Σd≤ 0.3, wherein R S31 is a fifth curvature radius of the third object side surface, wherein R S32 is a sixth curvature radius of the third image side surface, wherein d S3 is a third axial thickness of the third lens element, and wherein Σd is a sum of axial thicknesses of all lens elements in the constituent elements.
  8. 8 . The optical lens of claim 1 , wherein the fourth constituent element comprises a fourth lens element having a positive refractive power or a negative refractive power, wherein the fourth lens element comprises: a fourth object side surface that is convex or concave near an axis; and a fourth image side surface that is convex or concave near the axis, wherein the optical lens further satisfies the following relation: −28≤ f S4 /f≤ 8, wherein f S4 is a fourth focal length of the fourth lens element.
  9. 9 . The optical lens of claim 8 , wherein the fourth lens element satisfies the following relations: 0.9≤ R S41 /R S42 ≤1.8; and 0.1≤ d S4 /Σd≤ 0.2, wherein R S41 is a seventh curvature radius of the fourth object side surface, wherein R S42 is an eighth curvature radius of the fourth image side surface, wherein d S4 is a third axial thickness of the fourth lens element, and wherein Σd is a sum of axial thicknesses of all lens elements in the constituent elements.
  10. 10 . The optical lens of claim 1 , wherein the first constituent element comprises a first lens element, wherein the second constituent element comprises a second lens element, wherein the third constituent element comprises a third lens element, wherein the fourth constituent element comprises a fourth lens element, wherein the optical lens further satisfies the following relations: 20.9≤ v S1 −v S2 ≤36.8; −2.7≤ v S1 −v S3 ≤33.7; and −2.7≤ v S1 −v S4 ≤27.2, wherein v S1 is a first Abbe number of the first lens element, wherein v S2 is a second Abbe number of the second lens element, wherein v S3 is a third Abbe number of the third lens element, and wherein v S4 is a fourth Abbe number of the fourth lens element.
  11. 11 . A lens system comprising: an optical lens comprising: an object side; an image side; and a plurality of constituent elements comprising: a first constituent element having a positive refractive power and comprising a first lens element; a second constituent element having a negative refractive power; a third constituent element; and a fourth constituent element, wherein the first constituent element, the second constituent element, the third constituent element, and the fourth constituent element are arranged from the object side to the image side, wherein each of the constituent elements comprises at least one lens element, wherein each of the at least one lens element comprises: an object side surface facing the object side; and an image side surface facing the image side, wherein the optical lens satisfies the following relations: 0.432≤ f S1 /f≤ 0.689, wherein f S1 is a first focal length of the first lens element, and wherein f is a total focal length of the optical lens; 9.08≤BFL≤11.745; and 0.6≤BFL/TTL≤0.67, wherein BFL is a back focal length of the optical lens, and wherein the TTL is a total track length of the optical lens; a photosensitive element located on the image side; and a driving part coupled to the optical lens and configured to drive the optical lens to move towards or away from the photosensitive element.
  12. 12 . The lens system of claim 11 , wherein the first lens element has a positive refractive power, and wherein the first lens element comprises: a first object side surface that is convex near an axis; and a first image side surface that is convex or concave near the axis.
  13. 13 . The lens system of claim 12 , wherein the optical lens further satisfies the following relation: −0.345≤ R S11 /R S12 <0 or 0< R S11 /R S12 ≤0.348; and 0.2≤ d S1 /Σd≤ 0.4, wherein R S11 is a first curvature radius of the first object side surface, wherein R S12 is a second curvature radius of the first image side surface, wherein d S1 is a first axial thickness of the first lens element, and wherein Σd is a sum of axial thicknesses of all lens elements in the constituent elements.
  14. 14 . The lens system of claim 11 , wherein the second constituent element comprises a second lens element having a negative refractive power, wherein the second lens element comprises: a second object side surface that is convex near an axis; and a second image side surface that is concave near the axis, wherein the optical lens further satisfies the following relation: −7.559≤ f S2 /f≤− 0.494, wherein f S2 is a second focal length of the second lens element.
  15. 15 . The lens system of claim 14 , wherein the optical lens further satisfies the following relation: 1< R S21 /R S22 ≤3; and 0.1≤ d S2 /d≤ 0.2, wherein R S21 is a third curvature radius of the second object side surface, wherein R S22 is a fourth curvature radius of the second image side surface, wherein d S2 is a second axial thickness of the second lens element, and wherein Σd is a sum of axial thicknesses of all lens elements in the constituent elements.
  16. 16 . A terminal comprising: a lens system comprising: an optical lens comprising: an object side; an image side; and a plurality of constituent elements comprising: a first constituent element having a positive refractive power and comprising a first lens element; a second constituent element having a negative refractive power; a third constituent element; and a fourth constituent element, wherein the first constituent element, the second constituent element, the third constituent element, and the fourth constituent element are arranged from the object side to the image side, wherein each of the constituent elements comprises at least one lens element, wherein each of the at least one lens element comprises: an object side surface facing the object side; and an image side surface facing the image side, wherein the optical lens satisfies the following relations: 0.432≤ f S1 /f≤ 0.689, wherein f S1 is a first focal length of the first lens element, and wherein f is a total focal length of the optical lens; 9.08≤BFL≤11.745; and 0.6≤BFL/TTL≤0.67, wherein BFL is a back focal length of the optical lens, and wherein the TTL is a total track length of the optical lens; a photosensitive element located on the image side; and a driving part coupled to the optical lens and configured to drive the optical lens to move towards or away from the photosensitive element; and an image processor communicatively coupled to the lens system and configured to: receive image data from the lens system; and process the image data.
  17. 17 . The terminal of claim 16 , wherein the first lens element has a positive refractive power, and wherein the first lens element comprises: a first object side surface that is convex near an axis; and a first image side surface that is convex or concave near the axis.
  18. 18 . The terminal of claim 17 , wherein the optical lens further satisfies the following relation: −0.345≤ R S11 /R S12 <0 or 0< R S11 /R S12 ≤0.348; and 0.2≤ d S1 /Σd≤ 0.4, wherein R S11 is a first curvature radius of the first object side surface, wherein R S12 is a second curvature radius of the first image side surface, wherein d S1 is a first axial thickness of the first lens element, and wherein Σd is a sum of axial thicknesses of all lens elements in the constituent elements.
  19. 19 . The terminal of claim 16 , wherein the second constituent element comprises a second lens element having a negative refractive power, wherein the second lens element comprises: a second object side surface that is convex near an axis; and a second image side surface that is concave near the axis, wherein the optical lens further satisfies the following relation: −7.559≤ f S2 /f≤− 0.494, wherein f S2 is a second focal length of the second lens element.
  20. 20 . The terminal of claim 19 , wherein the optical lens further satisfies the following relation: 1< R S21 /R S22 ≤3; and 0.1≤ d S2 /Σd≤ 0.2, wherein R S21 is a third curvature radius of the second object side surface, wherein R S22 is a fourth curvature radius of the second image side surface, wherein d S2 is a second axial thickness of the second lens element, and wherein Σd is a sum of axial thicknesses of all lens elements in the constituent elements.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation of International Patent Application No. PCT/CN2021/085857 filed on Apr. 8, 2021, which claims priority to Chinese Patent Application No. 202010380470.0 filed on May 6, 2020. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD Implementations of this disclosure relate to the lens field, and in particular, to an optical lens, a lens module, and a terminal. BACKGROUND Terminals are generally equipped with different optical lenses for use in different scenes, so that the terminals are applicable for photographing in various scenes. For example, some terminals are equipped with long-focus lenses for implementing long-focus photographing. However, to achieve a better effect of long-focus photographing, a quantity of lens elements in an optical lens increases and thicknesses of the lens elements also increase. As a result, a thickness of the optical lens increases. The thickness of the optical lens is often a main factor that hinders the terminal from thinning. Therefore, how to reduce the thickness of the optical lens while achieving the long-focus effect of the optical lens has become a hot topic of research. SUMMARY Implementations of this disclosure provide an optical lens, a lens module including the optical lens, and a terminal including the lens module, to obtain an optical lens and a lens module with thin lens elements and a thin terminal while achieving a long-focus effect. According to a first aspect, an optical lens is provided. The optical lens includes a plurality of constituent elements, the plurality of constituent elements include a first constituent element, a second constituent element, a third constituent element, and a fourth constituent element arranged from an object side to an image side, each of the constituent elements includes at least one lens element, the first constituent element has positive refractive power, the second constituent element has negative refractive power, each lens element includes an object side surface facing the object side and an image side surface facing the image side, and the optical lens satisfies the following relations: 9.08≤BFL≤11.745; and 0.6≤BFL/TTL≤0.67, where the BFL is a back focal length of the optical lens, that is, a distance from a lens element closest to the image side of the optical lens to an image plane of the optical lens, and the TTL is a TTL of the optical lens, that is, a total length from an object side surface of a lens element closest to the object side of the optical lens to the image plane. It should be noted that in this implementation of this disclosure, using a lens element as a boundary, one side on which a photographed object is located is the object side, and on the lens element, a surface facing the object side may be referred to as an object side surface, and using the lens element as the boundary, one side on which an image obtained after the photographed object is imaged by the lens is the image side, and on the lens element, a surface facing the image side may be referred to as an image side surface. In this implementation of this disclosure, when the BFL and the TTL of the optical lens satisfy the foregoing relations, the optical lens can have a relatively long BFL. A thickness of the optical lens is affected by an axial thickness (TTL1) of a plurality of lens elements of the optical lens. If the axial thickness of the plurality of lens elements of the optical lens is greater, the thickness of the optical lens is greater. The axial thickness of the plurality of lens elements is an axial distance from the object side surface of the lens element closest to the object side to an image side surface of the lens element closest to the image side in the plurality of lens elements. In other words, the axial thickness of the plurality of lens elements is a difference between the TTL of the optical lens and the BFL of the optical lens. In this disclosure, because the optical lens can have a relatively long BFL, the TTL1 of the plurality of lens elements of the optical lens is relatively small, and further, the optical lens can have a relatively small thickness. Because the thickness of the optical lens is often a main factor that hinders the terminal from thinning, in this disclosure, making the thickness of the optical lens relatively small also enables a terminal including the optical lens to have a relatively small thickness, so that thinning of the terminal including the optical lens is implemented. In some implementations, a first lens element of the first constituent element has positive refractive power, an object side surface of the first lens element of the first constituent element is convex near an axis, an image side surface of the first lens element of the first constituent element is convex or concave near the axis, and the optical lens satisfies the following relation: 0.432≤fS1/f≤0.