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CN-121995600-A - Lens group, optical system and electronic equipment

CN121995600ACN 121995600 ACN121995600 ACN 121995600ACN-121995600-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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, the second lens group comprises a seventh lens, an eighth lens and a ninth lens, the third lens group comprises a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens, the lens groups meet that F8/CT8 is more than or equal to 2.36 and less than or equal to 3.35, FG1/F123 is more than or equal to 2.65, FG2/FG3 is more than or equal to 2.55 and less than or equal to 3.33, F8 is the effective focal length of the eighth lens, CT8 is the center thickness of the eighth lens, FG1 is the combined focal length of the first lens group, F123 is the combined focal length of the first lens, the second lens and the third lens, FG2 is the combined focal length of the second lens group, and FG3 is the combined focal length of the eighth lens group. The optical system combines miniaturization and cooperative correction, ensures high-efficiency coupling with the imaging lens, and achieves high-quality telephoto imaging effect.

Inventors

  • Wu Xujiong

Assignees

  • 浙江舜宇光学有限公司

Dates

Publication Date
20260508
Application Date
20260212

Claims (19)

  1. 1. A lens group includes, in order from an object side to an image side in an optical axis direction, a first lens group, a second lens group, and a third lens group, The first lens group has positive optical power, and the first lens group includes: A first lens with positive or negative focal power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; A second lens element with positive refractive power, wherein the object-side surface of the second lens element is convex and the image-side surface of the second lens element is convex; a third lens element with negative refractive power, wherein the object-side surface of the third lens element is concave and the image-side surface of the third lens element is convex; A fourth lens element with positive refractive power, wherein an object-side surface of the fourth lens element is convex, and an image-side surface of the fourth lens element is convex; A fifth lens with negative focal power, wherein the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a concave surface; a sixth lens having positive optical power, wherein the sixth lens object-side surface is a plane, the sixth lens image-side surface is a plane, and the sixth lens object-side surface is a diffraction plane; the second lens group has positive optical power, and the second lens group includes: A seventh lens with positive optical power, wherein the object side surface of the seventh lens is a convex surface; An eighth lens element with positive refractive power, wherein the object-side surface of the eighth lens element is convex and the image-side surface of the eighth lens element is concave; A ninth lens element with negative refractive power, wherein the object-side surface of the ninth lens element is convex and the image-side surface of the ninth lens element is concave; The third lens group has positive optical power, the third lens group including: A tenth lens having negative optical power, wherein an object-side surface of the tenth lens is a concave surface, and an image-side surface of the tenth lens is a concave surface; an eleventh lens having positive optical power, wherein the object-side surface of the eleventh lens is convex, and the image-side surface of the eleventh lens is convex; a twelfth lens element with negative refractive power, wherein the object-side surface of the twelfth lens element is convex and the image-side surface of the twelfth lens element is concave; A thirteenth lens element having positive optical power, wherein the thirteenth lens element has a convex object-side surface and the thirteenth lens element has a convex image-side surface; A fourteenth lens having positive optical power, wherein an object-side surface of the fourteenth lens is a convex surface; wherein the first lens, the second lens, and the third lens are cemented, the fourth lens and the fifth lens are cemented, the eighth lens and the ninth lens are cemented, the tenth lens and the eleventh lens are cemented, and the twelfth lens and the thirteenth lens are cemented; The lens group satisfies: 2.36≤f8/CT8≤3.35;2.05<FG1/F123<2.65;2.55≤FG2/FG3≤3.33, Wherein F8 is an effective focal length of the eighth lens, CT8 is a center thickness of the eighth lens, FG1 is a combined focal length of the first lens group, F123 is a combined focal length of the first lens, the second lens, and the third lens, FG2 is a combined focal length of the second lens group, and FG3 is a combined focal length of the third lens group.
  2. 2. The lens group of claim 1, wherein the combined focal length F45 of the fourth lens and the fifth lens, the center thickness CT4 of the fourth lens, and the center thickness CT5 of the fifth lens satisfy-11.85 < F45/(CT4+CT5) < -9.40.
  3. 3. The lens group according to claim 1, wherein an on-axis distance TD from the first lens object-side surface to the fourteenth lens image-side surface, an air space T56 on the optical axis of the fifth lens element and the sixth lens element, and an air space T67 on the optical axis of the sixth lens element and the seventh lens element satisfy 2.15< TD/(t56+t67) <2.95.
  4. 4. The lens group according to claim 1, wherein the combined focal length F89 of the eighth lens and the ninth lens, the radius of curvature R15 of the object-side surface of the eighth lens and the radius of curvature R18 of the image-side surface of the ninth lens satisfy-3.15≤F89/(R15+R18) < -2.70.
  5. 5. The lens group of claim 1, wherein the effective focal length f4 of the fourth lens and the sum of center thicknesses Σctg1 of all lenses in the first to sixth lenses satisfy 2.75+.f4/Σctg1<3.25.
  6. 6. The lens group of claim 1, wherein the combined focal length F1213 of the twelfth and thirteenth lenses and the on-axis distance LG3 of the tenth lens object-side to the fourteenth lens image-side satisfy 1.20< F1213/LG3<2.05.
  7. 7. The lens group according to claim 1, wherein the radius of curvature R28 of the fourteenth lens image side and the center thickness CT14 of the fourteenth lens satisfy 6.65|R28|/CT 14| 15.67.
  8. 8. The lens group of claim 1, wherein the effective focal length f14 of the fourteenth lens, the effective focal length f12 of the twelfth lens and the effective focal length f13 of the thirteenth lens satisfy-2.95 < f 14/(f12+f13) < -1.15.
  9. 9. The lens group of claim 1, wherein the combined focal length F456 of the fourth, fifth and sixth lenses and the effective focal length F7 of the seventh lens satisfy-3.00 < F456/F7< -2.15.
  10. 10. The lens group according to claim 1, wherein an effective focal length f9 of the ninth lens, an effective focal length f10 of the tenth lens, and an air interval T910 of the ninth lens and the tenth lens on the optical axis satisfy-3.47≤f9+f10)/T910≤2.40.
  11. 11. The lens group of claim 1, wherein an on-axis distance LG1 from the first lens object-side surface to the sixth lens image-side surface and an effective focal length f2 of the second lens satisfy 0.40< lg1/f2<1.10.
  12. 12. The lens assembly of claim 1, wherein the radius of curvature R5 of the object-side surface of the third lens element, the radius of curvature R6 of the image-side surface of the third lens element and the effective focal length f3 of the third lens element satisfy 0.95 +.R5+R6)/f 3 +.1.86.
  13. 13. The lens group according to claim 1, wherein a sum of center thicknesses Σctg3 of all lenses in the tenth to fourteenth lenses and a sum of center thicknesses Σctg2 of all lenses in the seventh to ninth lenses satisfy 1.87 Σctg3/Σctg2≤2.65.
  14. 14. The lens group of claim 1, wherein a combined focal length F12345 of the first, second, third, fourth and fifth lenses and a combined focal length F121314 of the twelfth, thirteenth and fourteenth lenses satisfy 7.15< F12345/F121314<9.75.
  15. 15. The lens group of claim 1, wherein a combined focal length FG2 of the second lens group and an on-axis distance LG2 from the seventh lens object-side surface to the ninth lens image-side surface satisfy 1.75 ∈fg2/LG2 ∈2.92.
  16. 16. The lens group of claim 1, wherein the center thickness CT10 of the tenth lens, the refractive index N10 of the tenth lens, the center thickness CT11 of the eleventh lens, and the refractive index N11 of the eleventh lens satisfy 0.30< (CT 10 x N10)/(CT 11 x N11) <1.40.
  17. 17. An optical system comprising the lens set of any one of claims 1-16.
  18. 18. The optical system according to claim 17, wherein the optical system further comprises an imaging lens and an imaging plane on a mirror image side of the fourteenth lens, and an outgoing light beam of the lens group enters the imaging lens to be imaged on the imaging plane by the imaging lens.
  19. 19. An electronic device comprising the optical system of claim 18.

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 With the rapid development of mobile communication technology and intelligent terminals, mobile devices (such as smartphones and tablet computers) have become the most important photographic tools in daily life. The requirements of users on the shooting quality of mobile devices are increasing, so that not only are high pixels and high definition pursued, but also a higher desire is made for the long-distance shooting capability. In order to achieve long-distance shooting, current mobile devices generally employ a digital zoom or multi-camera module (such as periscope type tele lens). However, digital zooming is essentially cutting and interpolating images, which results in significant degradation of image quality and loss of details, while the built-in periscope type tele module is limited by the thickness and internal space of the mobile phone body, and physical bottlenecks exist in aperture size, photosensitive element size and focal length coverage range, so that professional tele requirements are difficult to meet. Thus, external or add-on imaging systems (e.g., range finder) have become an effective solution for improving the telephoto capabilities of mobile devices. Disclosure of Invention An aspect 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, a second lens group, and a third lens group, the first lens group including a first lens having positive power or negative power, wherein the first lens object side is a convex surface, the first lens image side is a concave surface, a second lens having positive power, wherein the second lens object side is a convex surface, the second lens image side is a convex surface, the third lens object side is a concave surface, the third lens image side is a convex surface, a fourth lens having positive power, wherein the fourth lens object side is a convex surface, a fifth lens having negative power, wherein the fifth lens object side is a concave surface, a sixth lens having positive power, wherein the sixth lens object side is a convex surface, the third lens object side is a concave surface, a third lens having negative power, the third lens object side is a concave surface, the third lens object side is a convex surface, the fourth lens having positive power, the fourth lens object side is a convex surface, the fourth lens object side is a fifth lens having negative power, the fifth lens object side is a concave surface, the fifth lens having negative power, the eighth lens is a plane, the eighth lens has a positive power, the eighth lens is a plane, the eighth lens has the eighth power, the eighth lens object side is a plane, and the eighth lens has the eighth power, the lens group comprises a tenth lens object side which is concave, a tenth lens group which is concave, an eleventh lens with positive focal power which is convex, a twelfth lens with negative focal power which is convex, a thirteenth lens with positive focal power which is concave, a fourteenth lens with positive focal power which is convex, wherein the fourteenth lens object side is convex, wherein the first lens, the second lens and the third lens are cemented, the fourth lens and the fifth lens are cemented, the eighth lens and the ninth lens are cemented, the tenth lens and the eleventh lens are cemented, the twelfth lens and the thirteenth lens are cemented, the lens group meets that F8/CT 8.35, FG 1/FG 2.FG 2/FG 3.5, FG2/FG3 is a combination of 2.35, FG 2.FG 2/FG3, and FG 3.3/FG 2 is a combination of 2.3.3.5, and FG 3.3.3.3.3.2, and the combination of FG 2.3.3.3.3, wherein the fourth lens and FG 2.3.3 are combined, and the combination of the fourth lens and FG 2.3.8, the combination. According to the embodiment of the application, the combined focal length F45 of the fourth lens and the fifth lens, the center thickness CT4 of the fourth lens and the center thickness CT5 of the fifth lens meet the condition that-11.85 < F45/(CT4+CT5) < -9.40. According to the embodiment of the application, the on-axis distance TD from the object side surface of the first lens element to the image side surface of the fourteenth lens element, the air interval T56 between the fifth lens element and the sixth lens element on the optical axis and the air interval T67 between the sixth lens element and the seventh lens element on the optical axis satisfy 2.15< TD/(T56+T67) <2.95. According to the embodiment of the application, the combined focal length F89 of the eighth lens and the ninth lens, the curvature radius R15 of the object side surface of the eighth lens and the curvature radius R18 of the image side surface of the ninth lens meet that F89/(R15+R18) < -2.70 i