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CN-115657274-B - High-definition lens

CN115657274BCN 115657274 BCN115657274 BCN 115657274BCN-115657274-B

Abstract

The invention discloses a high-definition lens which comprises a first lens, a first cemented lens group, a diaphragm, a fourth lens and a fifth lens which are sequentially arranged from an object plane to an image plane, wherein the first lens and the fourth lens have negative focal power, the first cemented lens group and the fifth lens have positive focal power, the fifth lens is of a biconvex structure, the focal length of the lens is f, and the focal length of the first cemented lens group is f U1 ,f U1 and f meets the following relational expression that 0.35< |f U1 /f| <0.90. The lens formed by the invention has the characteristics of compactness and economy, can ensure high imaging resolution, small aperture and low distortion, can meet the requirements of industrial application, and has great market prospect and economic value.

Inventors

  • LIN JIAMIN

Assignees

  • 广东奥普特科技股份有限公司

Dates

Publication Date
20260505
Application Date
20221114

Claims (9)

  1. 1. A high-definition lens is characterized by comprising a first lens (G1), a first cemented lens group (U1), a diaphragm (S), a fourth lens (G4) and a fifth lens (G5) which are sequentially arranged from an object plane to an image plane, -The first lens (G1) and the fourth lens (G4) have negative optical power; the first cemented lens group (U1) and the fifth lens (G5) have positive optical power, and the fifth lens (G5) is of a biconvex structure; The focal length of the lens is f, the focal length of the first cemented lens group (U1) is f U1 , and the f U1 and the f satisfy the following relation: 0.35<|f U1 /f|<0.90; The focal length of the first lens (G1) is f G1 , and the f G1 and the f satisfy the following relation: 0.50<|f G1 /f|<1.00。
  2. 2. the high-definition lens according to claim 1, wherein the first cemented lens group (U1) includes a second lens (G2) and a third lens (G3); The second lens (G2) has a negative optical power and is of a meniscus configuration; the third lens (G3) has positive optical power and is of a biconvex structure.
  3. 3. The high-definition lens according to claim 2, wherein a distance L from a front surface vertex of the first lens (G1) to a rear surface vertex of the fifth lens (G5) satisfies the following relation with f: |L/f|>1.70。
  4. 4. a high definition lens according to claim 3, wherein the optical back intercept BFL from the back surface vertex to the image plane of the fifth lens (G5) and f satisfy the following relation: |BFL/f|<1.10。
  5. 5. the high definition lens of claim 4, wherein the half image height y' of the lens and the f satisfy the following relation: |y’/f|<0.45。
  6. 6. the high-definition lens as claimed in claim 5, wherein the fourth lens (G4) has a focal length f G4 , and the f G4 and the f satisfy the following relation: 0.60<|f G4 /f|<1.30。
  7. 7. The high-definition lens as claimed in claim 6, wherein a focal length f G5 of the fifth lens (G5) is f G5 , and the following relation is satisfied by the focal length f G5 : 0.65<|f G5 /f|<1.10。
  8. 8. the high-definition lens as claimed in claim 7, wherein the first lens (G1), the second lens (G2), the third lens (G3), the fourth lens (G4) and the fifth lens (G5) are spherical mirrors.
  9. 9. The high-definition lens according to claim 8, wherein the first lens (G1) has a biconcave structure, and the fourth lens (G4) has a meniscus structure; or, the first lens (G1) is in a meniscus structure, and the fourth lens (G4) is in a biconcave structure; or, the first lens (G1) is of a biconcave structure, and the fourth lens (G4) is of a biconcave structure; Or, the first lens (G1) has a meniscus structure, and the fourth lens (G4) has a meniscus structure.

Description

High-definition lens Technical Field The invention relates to the technical field of machine vision lenses, in particular to a high-definition lens. Background Along with continuous upgrade of modern industrial automation and intellectualization, requirements on a machine vision system are continuously improved, and particularly requirements on-line real-time detection, dynamic identification, application compatibility and the like are higher and higher, which means that under the condition of compact and small structure, the resolution of a machine vision optical lens is required to be improved as much as possible, the working distance is widened, and meanwhile, the depth of field is enlarged as much as possible to meet the detection requirement. However, most of the compact optical lenses in the market at present are monitoring lenses, and the performance indexes of the lenses are good, the distortion is large, the relative illumination is low, and the requirements of industrial application cannot be met. Therefore, development of small aperture, high resolution, low distortion, compact optical lenses is more urgent. The above information is presented as background information only to aid in the understanding of the present disclosure and is not intended or admitted to be prior art relative to the present disclosure. Disclosure of Invention The invention provides a high-definition lens which aims to overcome the defects in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: A high-definition lens comprises a first lens G1, a first cemented lens group U1, a diaphragm S, a fourth lens G4 and a fifth lens G5 which are sequentially arranged from an object plane to an image plane, The first lens G1 and the fourth lens G4 have negative optical power; the first cemented lens group U1 and the fifth lens G5 have positive optical power, and the fifth lens G5 is a biconvex structure; The focal length of the lens is f, the focal length of the first cemented lens group U1 is f U1, and the f U1 and the f satisfy the following relation: 0.35<|fU1/f|<0.90。 Further, in the high-definition lens, the first cemented lens group U1 includes a second lens G2 and a third lens G3; The second lens G2 has negative focal power and is of a meniscus structure; the third lens G3 has positive optical power and is of a biconvex structure. Further, in the high-definition lens, the distance L from the front surface vertex of the first lens G1 to the rear surface vertex of the fifth lens G5 satisfies the following relationship with f: |L/f|>1.70。 further, in the high-definition lens, the optical back intercept BFL from the vertex of the back surface of the fifth lens G5 to the image plane and the f satisfy the following relationship: |BFL/f|<1.10。 Further, in the high-definition lens, the half image height y' and f of the lens satisfy the following relation: |y’/f|<0.45。 further, in the high-definition lens, the focal length of the first lens G1 is f G1, and the f G1 and the f satisfy the following relation: 0.50<|fG1/f|<1.00。 Further, in the high-definition lens, the focal length of the fourth lens G4 is f G4, and the f G4 and the f satisfy the following relation: 0.60<|fG4/f|<1.30。 further, in the high-definition lens, the focal length of the fifth lens G5 is f G5, and the focal length f G5 and the f satisfy the following relationship: 0.65<|fG5/f|<1.10。 further, in the high-definition lens, the first lens G1, the second lens G2, the third lens G3, the fourth lens G4 and the fifth lens G5 are spherical mirrors. Further, in the high-definition lens, the first lens G1 is of a biconcave structure, and the fourth lens G4 is of a meniscus structure; or, the first lens G1 is in a meniscus structure, and the fourth lens G4 is in a biconcave structure; Or, the first lens G1 is of a biconcave structure, and the fourth lens G4 is of a biconcave structure; or, the first lens G1 is a meniscus structure, and the fourth lens G4 is a meniscus structure. Compared with the prior art, the embodiment of the invention has the following beneficial effects: According to the high-definition lens provided by the embodiment of the invention, the first lens, the first cemented lens group, the diaphragm, the fourth lens and the fifth lens are sequentially arranged from the object plane to the image plane, and the focal power of each lens and the focal length relation between the lens and the first cemented lens group are reasonably configured, so that the finally formed lens has the characteristics of compactness and economy, and the imaging resolution is high, the aperture is small and the distortion is low, so that the requirements of industrial application can be met, and the high-definition lens has great market prospect and economic value. Drawings In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in