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CN-121995608-A - Zoom optical system and optical lens

CN121995608ACN 121995608 ACN121995608 ACN 121995608ACN-121995608-A

Abstract

The invention discloses a zoom optical system and an optical lens, and relates to the technical field of zoom optics, wherein the zoom optical system is provided with an object side and an image side which are oppositely arranged along the optical axis direction, the zoom optical system comprises a first lens group, a second lens group, a third lens group, a fourth lens group and an image plane which are sequentially arranged along the object side to the image side, the focal power of the first lens group is positive, the focal power of the second lens group is negative, the focal power of the third lens group is positive, the focal power of the fourth lens group is positive, the second lens group and the fourth lens group are movably arranged along the optical axis direction, and the second lens group is used for zooming and the fourth lens group is used for focusing. By the arrangement, the zoom optical system can have larger zoom ratio, so that imaging of the zoom optical system is clear, and the effects of large zoom, high image quality and low cost of the zoom optical system are finally achieved.

Inventors

  • YU CUNSHENG
  • WANG XIAO
  • OU JUNXING

Assignees

  • 中山联合光电科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260204

Claims (10)

  1. 1. The utility model provides a zoom optical system, its characterized in that, zoom optical system has the opposite thing side and the image side that sets up along the optical axis direction, zoom optical system includes along thing side to image side set gradually first lens group, second lens group, third lens group, fourth lens group and image plane, the focal power of first lens group is positive the focal power of second lens group is negative, the focal power of third lens group is positive, the focal power of fourth lens group is positive, second lens group with fourth lens group all is along the optical axis direction activity setting, second lens group is used for the varifocal, fourth lens group is used for focusing, zoom optical system satisfies following condition: fw/f1 is more than or equal to 0.1 and less than or equal to 0.6, fw/f2 is more than or equal to-1 and less than or equal to-0.2, fw/f3 is more than or equal to 0.1 and less than or equal to 0.5, fw/f4 is more than or equal to 0.1 and less than or equal to 0.4; The focal length of the zoom optical system at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the focal length of the fourth lens group is f4.
  2. 2. The zoom optical system according to claim 1, wherein the first lens group includes a first lens, a second lens, a third lens, and a fourth lens which are disposed in this order from an object side to an image side, the focal power of the first lens is negative, the focal power of the second lens is positive, the focal power of the third lens is positive, the focal power of the fourth lens is positive, and the first lens and the second lens are disposed in cemented connection, the focal length of the first lens is f11, the focal length of the second lens is f12, the focal length of the third lens is f13, and the focal length of the fourth lens is f14, wherein, -0.6≤f1/f11≤0.1, and 0.52≤f1/f12≤0.71, and 0.46≤f1/f13≤0.62, and 0.31≤f1/f14≤0.
  3. 3. The zoom optical system according to claim 2, wherein a distance between an object-side surface center of the first lens and the image plane is TTL, TTL being less than or equal to 81.5mm.
  4. 4. The zoom optical system according to claim 1, wherein the second lens group includes a fifth lens, a sixth lens, and a seventh lens which are disposed in this order from an object side to an image side, wherein an optical power of the fifth lens is negative, an optical power of the sixth lens is negative, an optical power of the seventh lens is positive, a focal length of the fifth lens is f21, a focal length of the sixth lens is f22, and a focal length of the seventh lens is f23, wherein 0.70≤f2/f21≤0.95, and 0.52≤f2/f22≤0.70, and-0.49≤f2/f23≤0.36.
  5. 5. The zoom optical system according to claim 1, wherein the third lens group includes an eighth lens, a ninth lens, and a tenth lens which are disposed in this order from the object side to the image side, the optical power of the eighth lens is positive, the optical power of the ninth lens is positive, the optical power of the tenth lens is negative, the focal length of the eighth lens is f31, the focal length of the ninth lens is f32, the focal length of the tenth lens is f33, 1.25≤f3/f31≤1.69, and 0.05≤f3/f32≤0.06, and-0.8≤f3/f33≤0.59.
  6. 6. The zoom optical system according to claim 1, wherein the fourth lens group includes an eleventh lens, a twelfth lens, and a thirteenth lens which are disposed in this order from the object side to the image side, the optical power of the eleventh lens is positive, the optical power of the twelfth lens is negative, the optical power of the thirteenth lens is positive, the focal length of the eleventh lens is f41, the focal length of the twelfth lens is f42, the focal length of the thirteenth lens is f43, 1.12≤f4/f41≤1.52, and-1.07≤f4/f42≤0.79, and 0.5≤f4/f43≤0.68.
  7. 7. The zoom optical system of claim 1, wherein the image plane has a diameter IC of 7mm or less.
  8. 8. The zoom optical system according to claim 1, wherein the first lens group includes a first lens, a second lens, a third lens, and a fourth lens that are disposed in order from an object side to an image side, the second lens group includes a fifth lens, a sixth lens, and a seventh lens that are disposed in order from the object side to the image side, the third lens group includes an eighth lens, a ninth lens, and a tenth lens that are disposed in order from the object side to the image side, the fourth lens group includes an eleventh lens, a twelfth lens, and a thirteenth lens that are disposed in order from the object side to the image side, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the eighth lens, the tenth lens, and the eleventh lens are disposed as glass spherical lenses, and the sixth lens, the seventh lens, the ninth lens, the twelfth lens, and the thirteenth lens are disposed as plastic aspherical lenses.
  9. 9. The zoom optical system according to claim 1, further comprising a diaphragm provided between the second lens group and the third lens group, the diaphragm being configured to adjust a light passing amount of the zoom optical system.
  10. 10. An optical lens comprising a zoom optical system including the zoom optical system according to any one of claims 1 to 9.

Description

Zoom optical system and optical lens Technical Field The present invention relates to the field of zoom optics, and in particular, to a zoom optical system and an optical lens. Background The current mainstream zoom lens of high-image quality monitoring system in the market has the defects of large volume and high cost, and cannot meet the market demand. Disclosure of Invention The invention mainly aims to provide a zoom optical system and an optical lens, and aims to solve the problems that the existing zoom lens has the defects of large volume and high cost and cannot meet the market demand. In order to achieve the above object, the zoom optical system according to the present invention has an object side and an image side that are oppositely disposed along an optical axis direction, the zoom optical system includes a first lens group, a second lens group, a third lens group, a fourth lens group, and an image plane that are sequentially disposed along the object side to the image side, the optical power of the first lens group is positive, the optical power of the second lens group is negative, the optical power of the third lens group is positive, the optical power of the fourth lens group is positive, the second lens group and the fourth lens group are movably disposed along the optical axis direction, the second lens group is used for zooming, the fourth lens group is used for focusing, and the zoom optical system satisfies the following conditions: fw/f1 is more than or equal to 0.1 and less than or equal to 0.6, fw/f2 is more than or equal to-1 and less than or equal to-0.2, fw/f3 is more than or equal to 0.1 and less than or equal to 0.5, fw/f4 is more than or equal to 0.1 and less than or equal to 0.4; The focal length of the zoom optical system at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the focal length of the fourth lens group is f4. In an embodiment, the first lens group includes a first lens, a second lens, a third lens and a fourth lens sequentially disposed from an object side to an image side, wherein focal power of the first lens is negative, focal power of the second lens is positive, focal power of the third lens is positive, focal power of the fourth lens is positive, the first lens and the second lens are in glued connection, focal length of the first lens is f11, focal length of the second lens is f12, focal length of the third lens is f13, and focal length of the fourth lens is f14, wherein, -0.6 is less than or equal to f1/f11 is less than or equal to-0.1, and 0.52 is less than or equal to f1/f12 is less than or equal to 0.71, and 0.46 is less than or equal to f1/f13 is less than or equal to 0.62, and 0.31 is less than or equal to f1/f14 is less than or equal to 0.41. In an embodiment, a distance between an object side surface center of the first lens and the image plane is TTL, and TTL is less than or equal to 81.5mm. In an embodiment, the second lens group includes a fifth lens, a sixth lens and a seventh lens sequentially disposed from an object side to an image side, wherein the focal power of the fifth lens is negative, the focal power of the sixth lens is negative, the focal power of the seventh lens is positive, the focal length of the fifth lens is f21, the focal length of the sixth lens is f22, and the focal length of the seventh lens is f23, wherein f2/f21 is more than or equal to 0.70 and less than or equal to 0.95, f2/f22 is more than or equal to 0.52 and less than or equal to 0.70, and f2/f23 is more than or equal to-0.49 and less than or equal to-0.36. In an embodiment, the third lens group includes an eighth lens, a ninth lens and a tenth lens sequentially disposed from an object side to an image side, wherein the optical power of the eighth lens is positive, the optical power of the ninth lens is positive, the optical power of the tenth lens is negative, the focal length of the eighth lens is f31, the focal length of the ninth lens is f32, the focal length of the tenth lens is f33,1.25 f3/f31 is 1.69, 0.05 f3/f32 is 0.06, and-0.8 f3/f33 is 0.59. In an embodiment, the fourth lens group includes an eleventh lens, a twelfth lens and a thirteenth lens sequentially disposed from an object side to an image side, wherein the optical power of the eleventh lens is positive, the optical power of the twelfth lens is negative, the optical power of the thirteenth lens is positive, the focal length of the eleventh lens is f41, the focal length of the twelfth lens is f42, the focal length of the thirteenth lens is f43,1.12 f4/f41 is 1.52, and-1.07 f4/f42 is 0.79, and 0.5 f4/f43 is 0.68. In one embodiment, the diameter of the image plane is IC, and IC is less than or equal to 7mm. In an embodiment, the first lens group includes a first lens, a second lens, a third lens and a fourth lens sequentially disposed from an object side to an image side, the s