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CN-116299984-B - Telephoto lens and electronic equipment

CN116299984BCN 116299984 BCN116299984 BCN 116299984BCN-116299984-B

Abstract

The invention discloses a telephoto lens and electronic equipment, which consists of a first lens and a sixth lens from an object side to an image side in sequence, wherein the first lens, the second lens and the fifth lens have positive refractive power, the fourth lens and the sixth lens have negative refractive power, in addition, the object side surface and the image side surface of the first lens are respectively a convex surface and a concave surface, the object side surface and the image side surface of the second lens are respectively a convex surface, the object side surface and the image side surface of the third lens and the fourth lens are respectively a concave surface, and the object side surface and the image side surface of the fifth lens and the sixth lens are respectively a concave surface and a convex surface. In the telephoto lens, the focal length f of the telephoto lens, the focal length f1 of the first lens, and the total focal length f13 of the optical system formed by the first lens to the third lens satisfy the following conditions that the maximum field angle FOV of the telephoto lens is 0.3< f1/f <1.2, 0.9< f1/f13<1.5, and FOV <40. The invention reasonably restricts the focal length and the angle of view of the lens, so that the lens is light, thin, short and small, can well correct aberration, has high pixels, high resolution and excellent imaging quality, and can meet application requirements.

Inventors

  • LIN XIAOYI
  • Chen Tianmou
  • SHEN SHUN

Assignees

  • 广东旭业光电科技股份有限公司

Dates

Publication Date
20260512
Application Date
20230511

Claims (8)

  1. 1. A telephoto lens is characterized by comprising six lenses, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side, wherein each surface from the object side of the first lens to the image side of the sixth lens is an aspheric surface; The first 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 second lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the third lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region; The fourth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the fifth lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; The sixth 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 telephoto lens satisfies the following conditional expression: 0.6209≤f1/f≤0.7263; 1.161≤f1/f13≤1.319; FOV≤32.4; Wherein f is the focal length of the telephoto lens, f1 is the focal length of the first lens, f13 is the total focal length of the optical system formed from the first lens to the third lens, and FOV is the maximum field angle of the telephoto lens; the telephoto lens satisfies the following conditional expression: 7.183≤(T12+T45)/CT3≤9.70; Wherein T12 is an air gap between the first lens and the second lens on the optical axis, T45 is an air gap between the fourth lens and the fifth lens on the optical axis, and CT3 is a thickness of the third lens on the optical axis.
  2. 2. The telephoto lens of claim 1, wherein the telephoto lens satisfies the following conditional expression: 0.315≤SAG41+CT4≤0.542; wherein SAG41 is a horizontal displacement distance from an intersection point of the object side surface of the fourth lens element on the optical axis to a position of a maximum effective radius of the object side surface of the fourth lens element on the optical axis, and CT4 is a thickness of the fourth lens element on the optical axis.
  3. 3. The telephoto lens of claim 1, wherein the telephoto lens satisfies the following conditional expression: 0.389≤R1/f1≤0.40; wherein R1 is a radius of curvature of an object side surface of the first lens, and f1 is a focal length of the first lens.
  4. 4. The telephoto lens of claim 1, wherein the telephoto lens satisfies the following conditional expression: 0.9453≤EPD/DM51≤1.0232; wherein EPD is the entrance pupil diameter of the telephoto lens and DM51 is the maximum effective diameter of the object side of the fifth lens.
  5. 5. The telephoto lens of claim 1, wherein the telephoto lens satisfies the following conditional expression: -0.7390≤(R3+R4)/(R3-R4) ≤-0.4430; Wherein R3 is a radius of curvature of an object side surface of the second lens, and R4 is a radius of curvature of an image side surface of the second lens.
  6. 6. The telephoto lens of claim 1, wherein the telephoto lens satisfies the following conditional expression: 0.902≤f1/f2≤1.024; Wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens.
  7. 7. The telephoto lens of claim 1, wherein the object side of the first lens is further provided with a stop.
  8. 8. An electronic device comprising a telephoto lens according to any one of claims 1 to 7 and an imaging element for converting an optical pattern formed by the telephoto lens into an electrical signal.

Description

Telephoto lens and electronic equipment Technical Field The invention relates to the technical field of optical imaging, in particular to a telephoto lens and electronic equipment. Background In order to meet the market demand for miniaturization of electronic devices, the volume of lenses mounted in electronic devices nowadays tends to be miniaturized, which requires further shortening of the overall length of the lenses. However, in this way, the tele characteristics of the lens may be reduced, which makes it difficult for the telephoto lens to meet the requirements of remote photography. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a telephoto lens and electronic equipment, and solves the problem that the length of the lens is shortened in the prior art, so that the telephoto lens is difficult to meet the requirement of remote photography. In order to achieve the above object, the present invention provides the following technical solutions: the telephoto lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from an object side to an image side, wherein each surface from the object side of the first lens to the image side of the sixth lens is an aspheric surface; The first 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 second lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the third lens element with refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region; The fourth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the fifth lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; The sixth 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 telephoto lens satisfies the following conditional expression: 0.3<f1/f<1.2; 0.9<f1/f13<1.5; FOV<40; Wherein f is the focal length of the telephoto lens, f1 is the focal length of the first lens, f13 is the total focal length of the optical system formed from the first lens to the third lens, and FOV is the maximum field angle of the telephoto lens. Optionally, the telephoto lens satisfies the following conditional expression: 0.15<SAG41+CT4<0.7; wherein SAG41 is a horizontal displacement distance from an intersection point of the object side surface of the fourth lens element on the optical axis to a position of a maximum effective radius of the object side surface of the fourth lens element on the optical axis, and CT4 is a thickness of the fourth lens element on the optical axis. Optionally, the telephoto lens satisfies the following conditional expression: 0.2<R1/f1<0.65; wherein R1 is a radius of curvature of an object side surface of the first lens, and f1 is a focal length of the first lens. Optionally, the telephoto lens satisfies the following conditional expression: 0.7<EPD/DM51<1.3; wherein EPD is the entrance pupil diameter of the telephoto lens and DM51 is the maximum effective diameter of the object side of the fifth lens. Optionally, the telephoto lens satisfies the following conditional expression: -1<(R3+R4)/(R3-R4) <-0.15; Wherein R3 is a radius of curvature of an object side surface of the second lens, and R4 is a radius of curvature of an image side surface of the second lens. Optionally, the telephoto lens satisfies the following conditional expression: 5<(T12+T45)/CT3<11; Wherein T12 is an air gap between the first lens and the second lens on the optical axis, T45 is an air gap between the fourth lens and the fifth lens on the optical axis, and CT3 is a thickness of the third lens on the optical axis. Optionally, the telephoto lens satisfies the following conditional expression: 0.6<f1/f2<1.5; Wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens. Optionally, an aperture is further disposed on the object side of the first lens. The invention also provides an electronic device comprising the telephoto lens and an imaging element for converting an optical pattern formed by the telephoto lens into an electrical signal. Compared with the prior art, the invention has the following beneficial effects: the invention provides a telephoto lens and electronic equipment, which can reasonably restrict the focal length and the field angle of the lens, so that the overall length of the lens is shortened, the long-focus characteristic of the lens is ensured, and meanwhile, the imaging quality is higher. The telephoto lens provided by the i