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CN-122018122-A - Lens group, optical system and electronic equipment

CN122018122ACN 122018122 ACN122018122 ACN 122018122ACN-122018122-A

Abstract

The application provides a lens group, an optical system and electronic equipment. The lens group comprises a first lens group, a second lens group and a third lens group, wherein the first lens group comprises a first lens to a fourth lens, the second lens group comprises a fifth lens to an eighth lens, the third lens group comprises a ninth lens to a thirteenth lens, F5/T45 is more than or equal to 0.86 and less than or equal to 4.55, F910/(CT 9+CT10) is more than or equal to 2.65 and less than or equal to 3.52, F11/F1213< -1.50, F5 is an effective focal length of the fifth lens, T45 is an air interval between the fourth lens and the fifth lens on an optical axis, F910 is a combined focal length of the ninth lens and the tenth lens, CT9 is a center thickness of the ninth lens, CT10 is a center thickness of the tenth lens, F11 is an effective focal length of the eleventh lens, and F1213 is a combined focal length of the twelfth lens and the thirteenth lens. The lens group can obtain high-quality tele imaging effect.

Inventors

  • ZHAO SHIYU
  • HUANG LIN
  • ZHANG XIAOBIN
  • ZHAO LIEFENG

Assignees

  • 浙江舜宇光学有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (18)

  1. 1. A lens group, which includes a first lens group, a second lens group and a third lens group in order from an object side to an image side along an optical axis direction, is characterized in that, The first lens group has positive optical power, and the first lens group includes: a first lens having positive optical power, wherein an object side surface of the first lens is a convex surface, and an image side surface of the first lens is a convex surface; A second lens having negative optical power, wherein an object side surface of the second lens is a concave surface; A third lens having positive optical power, wherein an object side surface of the third lens is a convex surface, and an image side surface of the third lens is a convex surface; a fourth lens with negative focal power, wherein an object side surface of the fourth lens is a concave surface, and an image side surface of the fourth lens is a concave surface; the second lens group has positive optical power, and the second lens group includes: a fifth lens having positive optical power; a sixth lens having positive optical power, wherein an object side surface of the sixth lens is a convex surface; a seventh lens having negative optical power, wherein an image side surface of the seventh lens is a concave surface; An eighth lens element with positive or negative refractive power, wherein the object-side surface of the eighth lens element is concave and the image-side surface of the eighth lens element is convex; The third lens group has positive optical power, the third lens group including: a ninth lens having negative optical power, wherein an image side surface of the ninth lens is a concave surface; a tenth lens having positive optical power, wherein an object-side surface of the tenth lens is a convex surface, and an image-side surface of the tenth lens is a convex surface; An eleventh lens having negative optical power, wherein an object-side surface of the eleventh lens is a concave surface and an image-side surface of the eleventh lens is a convex surface; A twelfth lens with positive focal power, wherein an object side surface of the twelfth lens is a concave surface, and an image side surface of the twelfth lens is a convex surface; A thirteenth lens with positive focal power, wherein the object side surface of the thirteenth lens is a convex surface, Wherein the first lens is cemented with the second lens, the third lens is cemented with the fourth lens, the sixth lens is cemented with the seventh lens, and the ninth lens is cemented with the tenth lens; the lens group satisfies: 0.86≤f5/T45≤4.55;2.65≤F910/(CT9+CT10)≤3.52;-2.75<f11/F1213<-1.50; wherein F5 is an effective focal length of the fifth lens, T45 is an air space between the fourth lens and the fifth lens on the optical axis, F910 is a combined focal length of the ninth lens and the tenth lens, CT9 is a center thickness of the ninth lens, CT10 is a center thickness of the tenth lens, F11 is an effective focal length of the eleventh lens, and F1213 is a combined focal length of the twelfth lens and the thirteenth lens.
  2. 2. The lens group of claim 1 wherein the lens group satisfies 1.90< FG2/LG2<2.45, where FG2 is the combined focal length of the second lens group and LG2 is the on-axis distance from the object-side surface of the fifth lens to the image-side surface of the eighth lens.
  3. 3. The lens assembly of claim 1, wherein the lens assembly satisfies 2.10< F12/R1<4.50, wherein F12 is a combined focal length of the first lens and the second lens and R1 is a radius of curvature of an object side of the first lens.
  4. 4. The lens group of claim 1, wherein the lens group satisfies-0.65 < (f3+f4)/(f1+f2) < 0.20, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.
  5. 5. The lens group of claim 1 wherein the lens group satisfies 2.95< Σctg2/CT8<3.50, wherein Σctg2 is the sum of the center thicknesses of all lenses in the fifth lens to the eighth lens, CT8 is the center thickness of the eighth lens.
  6. 6. The lens group according to claim 1, wherein the lens group satisfies 1.90< fg3/T89<2.55, where FG3 is a combined focal length of the third lens group, and T89 is an air gap of the eighth lens and the ninth lens on the optical axis.
  7. 7. The lens group of claim 1 wherein the lens group satisfies 0.75< FG1/TD <1.65, where FG1 is the combined focal length of the first lens group and TD is the on-axis distance from the object side of the first lens to the image side of the thirteenth lens.
  8. 8. The lens group of claim 1, wherein the lens group satisfies 0.55 +.f13xn13)/(f12xn12) <1.60, where f13 is the effective focal length of the thirteenth lens, N13 is the refractive index of the thirteenth lens, f12 is the effective focal length of the twelfth lens, and N12 is the refractive index of the twelfth lens.
  9. 9. The lens group of claim 1 wherein the lens group satisfies 1.20< R14/T78<2.00, where R14 is the radius of curvature of the image side of the seventh lens and T78 is the air separation of the seventh and eighth lenses on the optical axis.
  10. 10. The lens group of claim 1 wherein the lens group satisfies 2.00< LG3/f10<3.50, wherein LG3 is the on-axis distance from the object-side surface of the ninth lens to the image-side surface of the thirteenth lens and f10 is the effective focal length of the tenth lens.
  11. 11. The lens group of claim 1, wherein the lens group satisfies 1.60≤F 91011/|F67|≤4.05, wherein F91011 is a combined focal length of the ninth lens, the tenth lens, and the eleventh lens, and F67 is a combined focal length of the sixth lens and the seventh lens.
  12. 12. The lens assembly of claim 1, wherein the lens assembly satisfies 1.00< Σctg1/Σctg3<1.65, wherein Σctg1 is the sum of the center thicknesses of all lenses in the first to fourth lenses, Σctg3 is the sum of the center thicknesses of all lenses in the ninth to thirteenth lenses.
  13. 13. The lens group of claim 1, wherein the lens group satisfies-4.75 < (R23+R24)/R25 < -2.25, wherein R23 is the radius of curvature of the object side of the twelfth lens, R24 is the radius of curvature of the image side of the twelfth lens, and R25 is the radius of curvature of the object side of the thirteenth lens.
  14. 14. An optical system comprising a lens set according to any one of claims 1-13.
  15. 15. The optical system of claim 14, further comprising an imaging lens and an imaging surface on the thirteenth lens image side, wherein the outgoing beam of the lens group enters the imaging lens to be imaged on the imaging surface by the imaging lens.
  16. 16. The optical system of claim 15, wherein the optical system satisfies-4.10 < f/FG3< -3.60, where f is an effective focal length of the optical system and FG3 is a combined focal length of the third lens group.
  17. 17. The optical system of claim 15, wherein the optical system satisfies-1.45≤f/(LG1+LG2). Ltoreq.1.01, wherein f is an effective focal length of the optical system, LG1 is an on-axis distance from an object-side surface of the first lens to an image-side surface of the fourth lens, and LG2 is an on-axis distance from the object-side surface of the fifth lens to the image-side surface of the eighth lens.
  18. 18. An electronic device comprising an optical system according to any one of claims 14-17.

Description

Lens group, optical system and electronic equipment Technical Field The present application relates to the field of optics, and more particularly, to a lens group, an optical system, and an electronic device. Background Under the current rapid development of mobile photography technology, users have put higher and higher demands on the image quality of smart phones and the expansibility of shooting scenes. The existing external tele lens scheme mostly adopts a simple lens group structure, and serious chromatic aberration, field curvature and distortion are extremely easy to be introduced while the focal length is obviously changed, so that the edge image quality is degraded. Disclosure of Invention An aspect of an embodiment of the present application provides a lens group including, in order from an object side to an image side in an optical axis direction, a first lens group having positive power, the first lens group including a first lens having positive power, wherein an object side of the first lens is a convex surface, an image side of the first lens is a convex surface, a second lens having negative power, wherein an object side of the second lens is a concave surface, a third lens having positive power, wherein an object side of the third lens is a convex surface, an image side of the third lens is a convex surface, a fourth lens having negative power, wherein an object side of the fourth lens is a concave surface, an image side of the fourth lens is a concave surface, the second lens group having positive power, the second lens group including a fifth lens having positive power, a sixth lens having positive power, wherein an object side of the sixth lens is a convex surface, a seventh lens having negative power, a eighth lens having negative power, a tenth lens having positive power, a ninth lens having negative power, a eighth lens having negative power, a tenth lens having positive power, a eighth lens having negative power, the image side surface of the eleventh lens is a convex surface; a twelfth lens with positive focal power, wherein the object side surface of the twelfth lens is a concave surface, the image side surface of the twelfth lens is a convex surface, a thirteenth lens with positive focal power, wherein the object side surface of the thirteenth lens is a convex surface, a first lens is bonded with the second lens, a third lens is bonded with the fourth lens, a sixth lens is bonded with the seventh lens, a ninth lens is bonded with the tenth lens, the lens group satisfies that F5/T45 is more than or equal to 0.86 and less than or equal to 4.55, F910/(CT9+CT10) is more than or equal to 2.65 and less than or equal to 3.52, F11/F1213 is more than or equal to-1.50, wherein F5 is an effective focal length of the fifth lens, T45 is an air space between the fourth lens and the fifth lens on the optical axis, F910 is a combination of the ninth lens and the tenth lens, CT9 is a center thickness of the ninth lens and CT10 is a center of the tenth lens, and F11 is a thirteenth focal length of the thirteenth lens. According to the embodiment of the application, the lens group meets 1.90< FG2/LG2<2.45, wherein FG2 is the combined focal length of the second lens group, and LG2 is the axial distance from the object side surface of the fifth lens to the image side surface of the eighth lens. According to the embodiment of the application, the lens group meets 2.10< F12/R1<4.50, wherein F12 is the combined focal length of the first lens and the second lens, and R1 is the curvature radius of the object side surface of the first lens. According to the embodiment of the application, the lens group is less than or equal to-0.65 < (f3+f4)/(f1+f2) < 0.20, wherein f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. According to an embodiment of the application, the lens group satisfies 2.95< Σctg2/CT8<3.50, wherein Σctg2 is the sum of the center thicknesses of all lenses in the fifth to eighth lenses, CT8 is the center thickness of the eighth lens. According to an embodiment of the application, the lens group satisfies 1.90< FG3/T89<2.55, wherein FG3 is a combined focal length of the third lens group, and T89 is an air gap of the eighth lens and the ninth lens on the optical axis. According to the embodiment of the application, the lens group meets 0.75< FG1/TD <1.65, wherein FG1 is the combined focal length of the first lens group, and TD is the axial distance from the object side surface of the first lens to the image side surface of the thirteenth lens. According to the embodiment of the application, the lens group meets 0.55-less (f13×N13)/(f12×N12) <1.60, wherein f13 is the effective focal length of the thirteenth lens, N13 is the refractive index of the thirteenth lens, f12 is the effective focal length of the twelfth lens, and N12 is the re