CN219456617U - Short-focus low-distortion optical system - Google Patents
Short-focus low-distortion optical system Download PDFInfo
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- CN219456617U CN219456617U CN202320472306.1U CN202320472306U CN219456617U CN 219456617 U CN219456617 U CN 219456617U CN 202320472306 U CN202320472306 U CN 202320472306U CN 219456617 U CN219456617 U CN 219456617U
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Abstract
The utility model relates to a short-focus low-distortion optical system. The optical system is arranged in order along the optical axis from the object side to the image side: a first lens group Z1, a second lens group Z2, a third lens group Z3, an image plane (IMA); wherein the third lens group Z3 is fixed relative to an image plane (IMA), and the first lens group Z1 and the second lens group Z2 move along the optical axis. The optical system selects eight groups of twelve-piece spherical lens combinations, reasonably selects and matches each lens material, reasonably controls the focal power, focal length ratio and shape concave-convex of each lens, realizes the resolution of millions of pixels of the system, has low distortion, can realize high-quality imaging in a wide working distance range, and can provide a high-quality imaging system for the technical field of industrial machine vision.
Description
Technical Field
The utility model relates to a short-focus low-distortion optical system, and relates to the technical field of optical lenses.
Background
With the arrival of industry 4.0, machine vision is continuously advancing the development of industrial machine vision technology by virtue of high precision, high efficiency, flexibility and reliability of the machine vision beyond human eyes, and the machine vision is playing an irreplaceable role in industries of consumer electronics, new energy sources, semiconductors, automobiles, traffic, medicines and the like.
Secondly, with the improvement of the industrial detection level, the sensor technology is continuously updated, and the technical field of industrial machine vision provides higher quality requirements for the vision lens. The existing vision lens has the defects that the pixels are low, the distortion is large, the lens cannot be used for high-definition imaging in a full object distance range and other different degrees, so that the design of the lens with higher pixels, lower distortion and wider working distance range to be matched with the use of machine vision becomes significant.
Disclosure of Invention
In view of the shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a short-focus low-distortion optical system.
In order to solve the technical problems, the technical scheme of the utility model is as follows: a short-focus low-distortion optical system in which a first lens group Z1, a second lens group Z2, and a third lens group Z3 are arranged in order along an optical axis in a direction from an object side to an image side; the third lens group Z3 is fixed relative to the image plane, and the first lens group Z1 and the second lens group Z2 move along the optical axis; the first lens group Z1 is composed of a meniscus lens L1, a meniscus lens L2, a biconcave lens L3, a biconvex lens L4, a meniscus lens L5 and a biconvex lens L6 in sequence; the second lens group Z2 is composed of a meniscus lens L7, a biconvex lens L8 and a meniscus lens L9 in sequence; the third lens group Z3 is composed of a biconcave lens L10, and a biconvex lens L11 in this order.
Preferably, the biconvex lens L4 and the meniscus lens L5 are bonded into a first bonding group H1, the biconvex lens L8 and the meniscus lens L9 are bonded into a second bonding group H2, and the biconcave lens L10 and the biconvex lens L11 are bonded into a third bonding group H3.
Preferably, the meniscus lens L1, the biconvex lens L4, the biconvex lens L6, the biconvex lens L8, and the biconvex lens L11 have positive optical power; the meniscus lens L2, the biconcave lens L3, the meniscus lens L5, the meniscus lens L7, the meniscus lens L9 and the biconcave lens L10 have negative focal power.
Preferably, the first bonding group H1 optical power is positive, the second bonding group H2 optical power is positive, and the third bonding group H3 optical power is negative.
Preferably, the optical system further includes a diaphragm, the diaphragm being located between the first lens group Z1 and the second lens group Z2; the air distance from the first lens group Z1 to the diaphragm is 2.373mm; the air distance from the diaphragm to the second lens group Z2 is 2.414mm.
Preferably, the optical system further comprises a plate glass, and the plate glass is positioned between the third gluing group H3 and the image plane; the air distance from the third lens group Z3 to the plate glass is 11.443mm; the air distance from the plate glass to the image surface is 0.2mm.
Preferably, the air distance from the meniscus lens L1 to the meniscus lens L2 is 0.1mm; the air distance from the meniscus lens L2 to the biconcave lens L3 is 6.8mm; the air distance from the biconcave lens L3 to the first adhesive group H1 is 1.799mm; the air distance from the first gluing group H1 to the lenticular lens L6 is 9.354mm; the air distance of the meniscus lens L7 to the second glue group H2 is 0.99mm.
Preferably, when the object distance is at infinity, the air distance from the second lens group Z2 to the third lens group Z3 is 2.136mm; when the object distance is at 200mm, the air distance from the second lens group Z2 to the third lens group Z3 is 4.588mm.
Preferably, the focal length f of the second glue group H2 H2 The following relation is satisfied with the total focal length f of the lens: and f is more than or equal to 8.7 H2 /f|≤9.2。
Preferably, the abbe number Vd of the lenticular lens L4 satisfies: 29.35 Vd is less than 34.1.
Compared with the prior art, the utility model has the following beneficial effects: the short-focus optical system with high imaging quality and stable performance is provided, and the lens of the short-focus optical system has tens of millions of pixel resolution and low distortion, and can realize high-quality imaging in a wide working distance range.
The utility model will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a graph of 200mm object distance transfer function of an optical system according to an embodiment of the present utility model.
Fig. 2 is a graph of 700mm object distance transfer function of an optical system in accordance with an embodiment of the present utility model.
Fig. 3 is a graph of a 1200mm object distance transfer function of an optical system in accordance with an embodiment of the present utility model.
Fig. 4 is a graph of an infinite object distance transfer function of an optical system according to an embodiment of the present utility model.
Fig. 5 is a graph of 200mm object distance field curvature and distortion of an optical system according to an embodiment of the present utility model.
Fig. 6 is a graph of 700mm object distance field curvature and distortion for an optical system according to an embodiment of the present utility model.
Fig. 7 is a graph of 1200mm object distance field curvature and distortion for an optical system according to an embodiment of the present utility model.
Fig. 8 is a graph of infinity object distance field curvature and distortion for an optical system according to an embodiment of the present utility model.
Fig. 9 is a diagram of an optical system according to an embodiment of the present utility model.
In the figure:
z1-a first lens group Z1, Z2-a second lens group Z2, Z3-a third lens group Z3;
l1-meniscus lenses L1, L2-meniscus lenses L2, L3-biconcave lenses L3, L4-biconvex lenses L4, L5-meniscus lenses L5, L6-biconvex lenses L6, L7-meniscus lenses L7, L8-biconvex lenses L8, L9-meniscus lenses L9, L10-biconcave lenses L10, L11-biconvex lenses L11;
h1-first bonding group H1, H2-second bonding group H2, H3-third bonding group H3;
STO-diaphragm, PG-plate glass, IMA-image plane.
Detailed Description
The utility model will be further described with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As shown in fig. 1 to 9, the present embodiment provides a short-focal low-distortion optical system in which a first lens group Z1, a second lens group Z2, and a third lens group Z3 are arranged in order along an optical axis in a direction from an object side to an image side; wherein the third lens group Z3 is fixed with respect to an image plane (IMA), and the first lens group Z1 and the second lens group Z2 move along an optical axis; the first lens group Z1 is composed of a meniscus lens L1, a meniscus lens L2, a biconcave lens L3, a biconvex lens L4, a meniscus lens L5 and a biconvex lens L6 in sequence; the second lens group Z2 is composed of a meniscus lens L7, a biconvex lens L8 and a meniscus lens L9 in sequence; the third lens group Z3 is composed of a biconcave lens L10, and a biconvex lens L11 in this order.
In the embodiment of the utility model, the biconvex lens L4 and the meniscus lens L5 are bonded into the first bonding group H1, so that the light energy reflection loss is reduced, the imaging brightness is increased, and the spherical aberration and chromatic aberration of the system are effectively improved. The biconvex lens L8 and the meniscus lens L9 are bonded into a second bonding group H2, and the biconcave lens L10 and the biconvex lens L11 are bonded into a third bonding group H3, so that aberration and chromatic aberration of the lens can be corrected better, and imaging quality is improved.
In the embodiment of the utility model, the meniscus lens L1, the biconvex lens L4, the biconvex lens L6, the biconvex lens L8 and the biconvex lens L11 all have positive focal power; the meniscus lens L2, the biconcave lens L3, the meniscus lens L5, the meniscus lens L7, the meniscus lens L9 and the biconcave lens L10 have negative focal power.
In the embodiment of the utility model, the first bonding group H1 optical power is positive, the second bonding group H2 optical power is positive, and the third bonding group H3 optical power is negative.
In an embodiment of the utility model, the optical system further comprises a Stop (STO) located between the first lens group Z1 and the second lens group Z2; the air distance from the first lens group Z1 to the diaphragm (STO) is 2.373mm; the air distance from the Stop (STO) to the second lens group Z2 is 2.414mm.
In an embodiment of the utility model, the optical system further comprises a Plate Glass (PG) located between the third glue group H3 and the image plane (IMA); an air distance from the third lens group Z3 to a Plate Glass (PG) is 11.443mm; the air distance from the Plate Glass (PG) to the image plane (IMA) is 0.2mm.
In the embodiment of the utility model, the air distance from the meniscus lens L1 to the meniscus lens L2 is 0.1mm; the air distance from the meniscus lens L2 to the biconcave lens L3 is 6.8mm; the air distance from the biconcave lens L3 to the first adhesive group H1 is 1.799mm; the air distance from the first gluing group H1 to the lenticular lens L6 is 9.354mm; the air distance of the meniscus lens L7 to the second glue group H2 is 0.99mm.
In the embodiment of the present utility model, when the object distance is at infinity, the air distance from the second lens group Z2 to the third lens group Z3 is 2.136mm; when the object distance is at 200mm, the air distance from the second lens group Z2 to the third lens group Z3 is 4.588mm.
In the embodiment of the utility model, the focal length f of the second gluing group H2 H2 The following relation is satisfied with the total focal length f of the lens: and f is more than or equal to 8.7 H2 And the f is less than or equal to 9.2, so that the imaging quality of the lens in a high-low temperature environment can be effectively improved.
In the embodiment of the present utility model, the abbe number Vd of the lenticular lens L4 satisfies: 29.35 Vd is less than 34.1, so that tolerance sensitivity can be reduced, and the yield of the lens can be improved.
In the embodiment of the utility model, the optical system selects eight groups of twelve-piece spherical lens combinations, and optical aberration is effectively optimized by reasonably selecting and matching lens materials, configuring focal power, focal length ratio, concave-convex shape of the lenses and diaphragm position of each lens, so that tens of millions of pixel resolution and low distortion of the system are realized, and high-quality imaging can be realized in a wide working distance range.
In an embodiment of the present utility model, the optical system transfer function graph: when the object distance is 200mm as shown in FIG. 1, the total image height MTF is more than or equal to 0.25@200lp/mm in the figure; when the object distance is 700mm as shown in FIG. 2, the total image height MTF is more than or equal to 0.25@200lp/mm in the figure; as shown in FIG. 3, the object distance is 1200mm, and the total image height MTF is more than or equal to 0.25@200lp/mm; as shown in FIG. 4, the object distance is infinity, and the total image height MTF is more than or equal to 0.25@200lp/mm in the figure. The optical system thus enables high quality imaging over a wide range of working object distances.
In an embodiment of the present utility model, the optical system field curvature and distortion curve chart: as shown in figures 5, 6, 7 and 8, the field Qu plus or minus 0.05mm and the optical distortion are less than or equal to minus 0.6 percent at 200mm, 700mm, 1200mm and infinite object distances. The optical system thus achieves low distortion over a wide range of working object distances.
In the embodiment of the utility model, the optical system also realizes the following technical indexes: the imaging target surface is less than or equal to phi 17.6mm, f=16mm, and the relative aperture is as follows: d/f=1/2.8, operating wavelength: visible light.
In an embodiment of the present utility model, the parameters of each lens are shown in the following table:
the above description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present utility model still fall within the protection scope of the technical solution of the present utility model.
Claims (10)
1. A short-focus low-distortion optical system, characterized in that: a first lens group Z1, a second lens group Z2 and a third lens group Z3 are sequentially arranged in the optical system along the direction from the object side to the image side; the third lens group Z3 is fixed relative to the image plane, and the first lens group Z1 and the second lens group Z2 move along the optical axis; the first lens group Z1 is composed of a meniscus lens L1, a meniscus lens L2, a biconcave lens L3, a biconvex lens L4, a meniscus lens L5 and a biconvex lens L6 in sequence; the second lens group Z2 is composed of a meniscus lens L7, a biconvex lens L8 and a meniscus lens L9 in sequence; the third lens group Z3 is composed of a biconcave lens L10, and a biconvex lens L11 in this order.
2. The short-focal low-distortion optical system according to claim 1, characterized in that: the biconvex lens L4 and the meniscus lens L5 are bonded into a first bonding group H1, the biconvex lens L8 and the meniscus lens L9 are bonded into a second bonding group H2, and the biconcave lens L10 and the biconvex lens L11 are bonded into a third bonding group H3.
3. The short-focal low-distortion optical system according to claim 1, characterized in that: the meniscus lens L1, the biconvex lens L4, the biconvex lens L6, the biconvex lens L8 and the biconvex lens L11 all have positive focal power; the meniscus lens L2, the biconcave lens L3, the meniscus lens L5, the meniscus lens L7, the meniscus lens L9 and the biconcave lens L10 have negative focal power.
4. The short-focal low-distortion optical system according to claim 2, characterized in that: the first gluing group H1 optical power is positive, the second gluing group H2 optical power is positive, and the third gluing group H3 optical power is negative.
5. The short-focal low-distortion optical system according to claim 1, characterized in that: the optical system further comprises a diaphragm, wherein the diaphragm is positioned between the first lens group Z1 and the second lens group Z2; the air distance from the first lens group Z1 to the diaphragm is 2.373mm; the air distance from the diaphragm to the second lens group Z2 is 2.414mm.
6. The short-focal low-distortion optical system according to claim 2, characterized in that: the optical system further comprises a plate glass, wherein the plate glass is positioned between the third gluing group H3 and the image plane; the air distance from the third lens group Z3 to the plate glass is 11.443mm; the air distance from the plate glass to the image surface is 0.2mm.
7. The short-focal low-distortion optical system according to claim 2, characterized in that: the air distance from the meniscus lens L1 to the meniscus lens L2 is 0.1mm; the air distance from the meniscus lens L2 to the biconcave lens L3 is 6.8mm; the air distance from the biconcave lens L3 to the first adhesive group H1 is 1.799mm; the air distance from the first gluing group H1 to the lenticular lens L6 is 9.354mm; the air distance of the meniscus lens L7 to the second glue group H2 is 0.99mm.
8. The short-focal low-distortion optical system according to claim 1, characterized in that: when the object distance is at infinity, the air distance from the second lens group Z2 to the third lens group Z3 is 2.136mm; when the object distance is at 200mm, the air distance from the second lens group Z2 to the third lens group Z3 is 4.588mm.
9. The short-focal low-distortion optical system according to claim 2, characterized in that: focal length f of the second glue group H2 H2 The following relation is satisfied with the total focal length f of the lens: and f is more than or equal to 8.7 H2 /f|≤9.2。
10. The short-focal low-distortion optical system according to claim 1, characterized in that: the abbe number Vd of the lenticular lens L4 satisfies: 29.35 Vd is less than 34.1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320472306.1U CN219456617U (en) | 2023-03-14 | 2023-03-14 | Short-focus low-distortion optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320472306.1U CN219456617U (en) | 2023-03-14 | 2023-03-14 | Short-focus low-distortion optical system |
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| CN219456617U true CN219456617U (en) | 2023-08-01 |
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| CN202320472306.1U Active CN219456617U (en) | 2023-03-14 | 2023-03-14 | Short-focus low-distortion optical system |
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