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CN-121978824-A - Optical lens, camera module and terminal equipment

CN121978824ACN 121978824 ACN121978824 ACN 121978824ACN-121978824-A

Abstract

The application discloses an optical lens, an image capturing module and terminal equipment, which comprise a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, a seventh lens with positive refractive power, a convex object side, a eighth lens with positive refractive power, a convex object side and a concave image side, wherein the object side and the image side are both convex. The optical lens includes a variable aperture. Satisfying the relation that the FOV is more than or equal to 130deg and less than or equal to 160deg, the FOV is more than or equal to 80deg and less than or equal to 150 deg/(FNOv 1-FNOv 2), satisfying the large field angle and high imaging quality, and simultaneously having the characteristic of iris diaphragm.

Inventors

  • FENG KE
  • Qiu Yuanhuang
  • YUE GUOQIANG

Assignees

  • 江西欧菲光学有限公司

Dates

Publication Date
20260505
Application Date
20260122

Claims (10)

  1. 1. An optical lens, characterized in that eight lens elements with refractive power are provided in total, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element, which are disposed in order from an object side to an image side along an optical axis; The first lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region; the fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region; the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region; the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region; The seventh lens element with positive refractive power has a convex object-side surface at a paraxial region; The eighth lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the optical lens further comprises a variable aperture, wherein the variable aperture is provided with an adjustable light transmission aperture; The optical lens satisfies the following relation: 130deg≤FOV≤160deg、80deg≤FOV/(FNOv1-FNOv2)≤150deg; Wherein FOV is the maximum field angle of the optical lens, FNOv is the maximum value of f-number of the optical lens, FNOv is the minimum value of f-number of the optical lens.
  2. 2. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: TTL/F is more than or equal to 7.75 and less than or equal to 8.75, and/or F/IMGH is more than or equal to 0.92 and/or F/FNOv is more than or equal to 1.3mm and less than or equal to 1.76mm and/or F/FNOv is more than or equal to 2.8mm and less than or equal to 3.2mm; wherein TTL is the distance between the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis, F is the focal length of the optical lens element, IMGH is half of the image height corresponding to the maximum field angle of the optical lens element.
  3. 3. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: -5≤F2/F≤3, and/or 3≤F3/F≤3.6, and/or 0≤F4/F567≤0.32; Wherein F is a focal length of the optical lens, F2 is a focal length of the second lens, F3 is a focal length of the third lens, F4 is a focal length of the fourth lens, and F567 is a combined focal length of the fifth lens, the sixth lens, and the seventh lens.
  4. 4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: CT12/CT2 1.9, and/or TTL/CT34 14.5, and/or CT3/CT4 1.45, and/or CT3/CT2 1.6, and/or CT3/CT2 1.3, and/or CT3/CT4 1.45, and/or CT3/CT2 1.6, respectively; Wherein, CT12 is the distance between the image side surface of the first lens element and the object side surface of the second lens element on the optical axis, CT2 is the thickness of the second lens element on the optical axis, TTL is the distance between the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis, CT34 is the distance between the image side surface of the third lens element and the object side surface of the fourth lens element on the optical axis, CT3 is the thickness of the third lens element on the optical axis, and CT4 is the thickness of the fourth lens element on the optical axis.
  5. 5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: -1.1≤R5/R6≤0.3, and/or-0.6≤R7+R8)/(R7-R8). Ltoreq.0.25, and/or-1.4≤R16/R15≤4.5; Wherein R5 is a radius of curvature of the object-side surface of the third lens element at the optical axis, R6 is a radius of curvature of the image-side surface of the third lens element at the optical axis, R7 is a radius of curvature of the object-side surface of the fourth lens element at the optical axis, R8 is a radius of curvature of the image-side surface of the fourth lens element at the optical axis, R15 is a radius of curvature of the object-side surface of the eighth lens element at the optical axis, and R16 is a radius of curvature of the image-side surface of the eighth lens element at the optical axis.
  6. 6. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: SAGS1v2/CT1 1.3 and/or CT3/ET3v2 1.5 and/or CT5/ET5v2 and/or CT3/ET3v 21 and/or CT5/ET5v2 respectively; The distance from the intersection point of the object side surface of the first lens to the object side surface of the first lens is the distance from the maximum effective caliber of the object side surface of the first lens to the optical axis when the f-number of the optical lens is the minimum, the distance from the maximum effective semi-caliber of the object side surface of the third lens to the maximum effective semi-caliber of the image side surface of the third lens is the distance from the maximum effective semi-caliber of the object side surface of the corresponding third lens to the distance from the maximum effective semi-caliber of the image side surface of the third lens to the direction parallel to the optical axis when the f-number of the optical lens is the minimum, and the distance from the maximum effective semi-caliber of the object side surface of the corresponding fifth lens to the distance from the maximum effective semi-caliber of the object side surface of the fifth lens to the image side surface of the fifth lens is the distance from the maximum effective semi-caliber of the corresponding fifth lens to the direction parallel to the optical axis when the f-number of the optical lens is the minimum.
  7. 7. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 1.5≤SD 1v 2/IMGH≤1.8, and/or 1.35≤SD 1v 1/IMGH≤1.65, and/or (SD 1v2-SD1v 1)/SD 1v 2≤0.13; Wherein SD1v2 is the maximum effective half caliber of the object side surface of the first lens corresponding to the minimum f-number of the optical lens, IMGH is half of the image height corresponding to the maximum field angle of the optical lens, and SD1v1 is the maximum effective half caliber of the object side surface of the first lens corresponding to the maximum f-number of the optical lens.
  8. 8. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 118 deg≤FOV F/IMGH≤132 deg, and/or 2≤Sigma CT/. Sigma AT≤2.4, and/or 8≤TTL/BFL≤11; Wherein IMGH is half of an image height corresponding to a maximum field angle of the optical lens, F is a focal length of the optical lens, Σct is a sum of thicknesses of all lenses of the first lens to the eighth lens on an optical axis, Σat is a sum of air intervals between two adjacent lenses of the first lens to the eighth lens, TTL is a distance between an object side surface of the first lens and an imaging surface of the optical lens on the optical axis, and BFL is a distance between an image side surface of the eighth lens and the imaging surface of the optical lens on the optical axis.
  9. 9. An imaging module comprising an image sensor and the optical lens according to any one of claims 1 to 8, wherein the image sensor is disposed on an image side of the optical lens.
  10. 10. A terminal device, comprising a housing and the camera module of claim 9, wherein the camera module is disposed on the housing.

Description

Optical lens, camera module and terminal equipment Technical Field The present application relates to the field of optical imaging technologies, and in particular, to an optical lens, a camera module, and a terminal device. Background Along with the upgrade of the automobile intellectualization to a high-order automatic driving and panoramic looking-around system, the requirements of the vehicle-mounted vision system on the optical performance of the lens are comprehensively improved, and the performance short plates of the traditional fixed aperture, small image plane and low-resolution lens are difficult to adapt to the requirements. The existing optical lens applied to the automobile has a narrow field angle, imaging blurring is caused by overexposure under strong light, image noise is increased, target omission is easily caused by insufficient light entering under weak light, and a sensing blind area with delayed response can be formed when illumination is suddenly changed. Therefore, how to reasonably configure parameters such as the number of lenses, the surface shape and the like of the optical lens, so that the lens has a variable aperture and a large field angle, and can meet the requirement of good imaging quality, and the problem to be solved is urgent. Disclosure of Invention The embodiment of the application discloses an optical lens, an imaging module and terminal equipment, which can meet the requirements of large field angle and high imaging quality and have the characteristic of an iris diaphragm. In order to achieve the above object, a first aspect of the present application discloses an optical lens, in which eight lens elements having refractive power in total, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element, which are disposed in order from an object side to an image side along an optical axis; The first lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region; the fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region; the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface at a paraxial region; the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface at a paraxial region; The seventh lens element with positive refractive power has a convex object-side surface at a paraxial region; The eighth lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the optical lens further comprises a variable aperture, wherein the variable aperture is provided with an adjustable light transmission aperture; The optical lens satisfies the following relation: 130deg≤FOV≤160deg、80deg≤FOV/(FNOv1-FNOv2)≤150deg; Wherein FOV is the maximum field angle of the optical lens, FNOv is the maximum value of f-number of the optical lens, FNOv is the minimum value of f-number of the optical lens. The optical lens, the camera module and the terminal equipment disclosed by the application have the variable aperture, so that the aperture size of the optical lens can be adjusted, and the stable imaging with uniform exposure and clear details in a full illumination environment can be realized by dynamically adjusting the light inlet quantity in real time, thereby improving the imaging quality of the optical lens. By setting the first lens element with negative refractive power, the object-side surface and the image-side surface thereof are convex and concave at the paraxial region thereof, so that the incident light beam with a large angle enters the optical lens element, the viewing angle range of the optical lens element is enlarged, and the characteristic of a large viewing angle is satisfied. The second lens element with negative refractive power has a concave object-side surface and a convex image-side surface at a paraxial region, and is adapted to correct an aberration generated by the first lens element. The third lens element with positive refractive power has convex object-side and image-side surfaces at the paraxial region thereof, so as to enhance the light convergence of the optical lens element at the paraxial region thereof, delay the incident angle of the light, and allow the light to smoothly enter the rear lens element. The fourth lens element with positive refractive