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CN-120315129-B - Optical lens

CN120315129BCN 120315129 BCN120315129 BCN 120315129BCN-120315129-B

Abstract

The invention provides an optical lens, which comprises six lenses in total, a first lens with negative focal power, a second lens with negative focal power, a third lens and a fourth lens, wherein the first lens is provided with a concave object side surface and a convex image side surface in sequence from an object side to an imaging surface along an optical axis; the lens system comprises a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, wherein the object side curvature radius R3 of the second lens and the image side curvature radius R4 of the second lens meet the condition that I (R3 + R4)/(R3-R4) I <0.78. The optical lens provided by the invention has one or more advantages of large target surface, large aperture, small distortion and the like.

Inventors

  • Xiao Pulu
  • Li Zhaochenxi
  • LING BINGBING

Assignees

  • 江西联创电子有限公司

Dates

Publication Date
20260512
Application Date
20250427

Claims (10)

  1. 1. An optical lens comprising six lenses in order from an object side to an imaging surface along an optical axis, comprising: the first lens with negative focal power has a concave object side surface and a convex image side surface; A second lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface; A third lens having positive optical power; a fourth lens having positive optical power; a fifth lens having negative optical power, the image-side surface of which is concave; a sixth lens having positive optical power; wherein the object-side surface curvature radius R3 of the second lens and the image-side surface curvature radius R4 of the second lens satisfy | (R3+R4)/(R3-R4) | <0.78; the total optical length TTL of the optical lens and the effective focal length f of the optical lens are 4.6< TTL/f <5.3, and the real image height IH corresponding to the maximum field angle of the optical lens and the total optical length TTL of the optical lens are 4.6< TTL/IH <5; The focal length f1 of the first lens and the effective focal length f of the optical lens meet the conditions that-12.5 < f1/f < -6.3; The maximum field angle FOV of the optical lens and the aperture value Fno of the optical lens satisfy 37 ° < FOV/Fno <43 °.
  2. 2. The optical lens of claim 1, wherein the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy-0.64 < (R3+R4)/(R3-R4) <0.78; The total optical length TTL of the optical lens and the effective focal length f of the optical lens meet 4.68< TTL/f <5.23, and the real image height IH corresponding to the maximum field angle of the optical lens and the total optical length TTL of the optical lens meet 4.61< TTL/IH <4.92; the focal length f1 of the first lens and the effective focal length f of the optical lens meet the conditions of-12.47 < f1/f < -6.38.
  3. 3. The optical lens according to claim 1, wherein a maximum field angle FOV of the optical lens and an aperture value Fno of the optical lens satisfy 37.38 ° -FOV/Fno-42.50 °, and a real image height IH corresponding to the maximum field angle of the optical lens and an entrance pupil diameter EPD of the optical lens satisfy 1.6< IH/EPD <1.9.
  4. 4. The optical lens according to claim 1, wherein a real image height IH corresponding to a maximum field angle of the optical lens and an effective focal length f of the optical lens satisfy 1< IH/f <1.1, and a back focal length BFL of the optical lens and an effective focal length f of the optical lens satisfy 0.85< BFL/f <1.35.
  5. 5. The optical lens of claim 1, wherein the object-side light passing half-aperture d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy 2.3< d 1/(IH/2)/tan (FOV/2) <3, and the optical lens further comprises a diaphragm between the second lens and the third lens or between the third lens and the fourth lens, and the combined focal length f of all lenses after the diaphragm and the effective focal length f of the optical lens satisfy 1.3< f back/f <3.4.
  6. 6. The optical lens of claim 1, wherein the object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy-3.3 < (R1+R2)/(R1-R2) < -2.5.
  7. 7. The optical lens of claim 1, wherein a focal length f2 of the second lens and an effective focal length f of the optical lens satisfy-2.6 < f2/f < -1.5, an object-side surface radius of curvature R3 of the second lens and an effective focal length f of the optical lens satisfy-7 < R3/f < -1.5, and an image-side surface radius of curvature R4 of the second lens and an effective focal length f of the optical lens satisfy 0.8< R4/f <6.9.
  8. 8. The optical lens of claim 1, wherein a focal length f5 of the fifth lens and an effective focal length f of the optical lens satisfy-1.9 < f5/f < -0.6, and an image side curvature radius R10 of the fifth lens and an effective focal length f of the optical lens satisfy 0.85< R10/f <2.
  9. 9. The optical lens of claim 1, wherein an object-side light-transmitting half-caliber Sag3 of the second lens and an object-side light-transmitting half-caliber d3 of the second lens meet 0.13< Sag3/d3<0.01, and an image-side light-transmitting half-caliber Sag4 of the second lens and an image-side light-transmitting half-caliber d4 of the second lens meet 0.24< Sag4/d4<0.5.
  10. 10. The optical lens of claim 1, wherein the object-side radius of curvature R1 of the first lens, the image-side radius of curvature R2 of the first lens and the center thickness CT1 of the first lens satisfy 0.44< (R1-CT 1)/R2 <0.56, and the object-side radius of curvature R3 of the second lens, the image-side radius of curvature R4 of the second lens and the center thickness CT2 of the second lens satisfy-7.9 < (R3-CT 2)/R4 < -0.25.

Description

Optical lens Technical Field The invention relates to the technical field of imaging lenses, in particular to an optical lens. Background At the moment of the vigorous development of automobile auxiliary driving and automatic driving technologies, the vehicle-mounted camera has a very important position. The vehicle-mounted cameras are various in types, including inward vision, backward vision, forward vision, side vision, circular vision and the like. The functions of the two components are unique, and the two components have different application scenes. For example, the forward-looking wide-angle camera is mainly used for accurately identifying a close-range object, and can provide key information for driving in the scenes of urban road working conditions, low-speed running of vehicles and the like. And the front view camera is called as a core component of an ADAS (advanced driving assistance system). The method not only carries the heavy duty of ranging, but also can accurately identify objects and clearly distinguish road marks, and as a result, the required visual algorithm is extremely complex and the technical threshold is quite high. In order to fully exert the performance of the front-view camera, it is urgent to develop an optical lens with excellent imaging effect, and only then can ensure stable and efficient operation in a complex driving environment, thus building a firm foundation for further development of automatic driving technology. Disclosure of Invention In view of the foregoing, an object of the present invention is to provide an optical lens having an advantage of excellent imaging quality. The invention adopts the technical scheme that: An optical lens comprising six lenses in order from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a concave object side surface and a convex image side surface; A second lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface; A third lens having positive optical power; a fourth lens having positive optical power; a fifth lens having negative optical power, the image-side surface of which is concave; a sixth lens having positive optical power; Wherein the object-side surface curvature radius R3 of the second lens and the image-side surface curvature radius R4 of the second lens satisfy | (R3+R4)/(R3-R4) | <0.78. Further preferably, the optical total length TTL of the optical lens and the effective focal length f of the optical lens meet 4.6< TTL/f <5.3, and the real image height IH corresponding to the maximum field angle of the optical lens and the optical total length TTL of the optical lens meet 4.6< TTL/IH <5. Further preferably, the maximum field angle FOV of the optical lens and the aperture value FNo of the optical lens satisfy 37 DEG < FOV/FNo <43 DEG, and the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy 1.6< IH/EPD <1.9. Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens meet 1< IH/f <1.1, and the back focal length BFL of the optical lens and the effective focal length f of the optical lens meet 0.85< BFL/f <1.35. Further preferably, the light passing half aperture d1 of the object side surface of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy 2.3< d 1/(IH/2)/tan (FOV/2) <3, the optical lens further comprises a diaphragm positioned between the second lens and the third lens or between the third lens and the fourth lens, and the combined focal length f of all lenses after the diaphragm satisfies 1.3< f and the effective focal length f of the optical lens. Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens meet-12.5 < f1/f < -6.3, and the object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens meet-3.3 < - (R1+R2)/(R1-R2) < -2.5. Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens meet-2.6 < f2/f < -1.5, the object-side surface curvature radius R3 of the second lens and the effective focal length f of the optical lens meet-7 < R3/f < -1.5, and the image-side surface curvature radius R4 of the second lens and the effective focal length f of the optical lens meet-0.8 < R4/f <6.9. Further preferably, the focal length f5 of the fifth lens and the effective focal length f of the optical lens meet-1.9 < f5/f < -0.6, and the image side curvature radius R10 of the fifth lens and the effective focal length f of the optical lens meet-0.85 < R10/f <2. Further preferably, the object-side light-transmitting half-caliber rise Sag3 of t