Relay lens and sample detection equipment

Abstract

The utility model discloses a relay lens and a sample detection device, the relay lens comprises a diaphragm and two lens modules, the two lens modules are oppositely arranged on two sides of the diaphragm, each lens module comprises a first lens, a second lens and a lens group, and the first lens, the second lens and the lens group are sequentially arranged along the direction facing the diaphragm. The first lens is a biconvex aspheric lens, and the abbe number of the second lens is larger than that of the first lens. According to the relay lens, the two lens modules are arranged on the two sides of the diaphragm respectively, and the first lens, the second lens and the lens group in each lens module are combined, so that the aperture is enlarged, the object distance, the image distance and the amplification factor are effectively controlled, and the fluorescence collection capability is greatly improved and the chromatic aberration is eliminated under the condition of ensuring the definition and the observation field of view.

Description

Technical Field

[0001] The utility model belongs to the technical field of sample detection, and in particular relates to a relay lens and sample detection equipment. Background Art

[0002] Currently, in the field of sample detection technology, there are sample detection devices that utilize fluorescence in situ hybridization (FISH) for microbial identification and drug sensitivity analysis. These devices use a fluorescein-labeled fluorescent probe to enter the sample microbial cell and hybridize with ribosomal RNA. An excitation light source illuminates the sample to stimulate fluorescence, which is then captured and photographed using a relay lens. Observation with a highly sensitive camera and combined with image analysis software allows the presence of target microorganisms in the sample, as well as their number and distribution, to be detected. However, to ensure clarity and field of view, relay lenses used in existing sample detection devices typically have a large aperture. A large aperture results in a small aperture, which is not conducive to fluorescence collection and rapid fluorescence imaging. It can also result in severe chromatic aberration, which in turn affects the accuracy of test results. Utility Model Content

[0003] In view of the above-mentioned defects or shortcomings, the present invention provides a relay lens and a sample detection device, aiming to solve the technical problem that the existing relay lens is not conducive to fluorescence collection and rapid fluorescence imaging.

[0004] In order to achieve the above object, the present invention provides a relay lens, which comprises:

[0005] Aperture;

[0006] Two lens modules are arranged opposite to each other on both sides of the aperture. Each lens module includes a first lens, a second lens and a lens group, and the first lens, the second lens and the lens group are arranged in sequence along the direction toward the aperture. The first lens is set as a biconvex aspheric lens, and the Abbe number of the second lens is greater than the Abbe number of the first lens.

[0007] In an embodiment of the present invention, the Abbe number of the second lens is set to be greater than or equal to 68.

[0008] In an embodiment of the present invention, the second lens is configured as a biconvex spherical lens, the lens group includes a third lens, a fourth lens and a fifth lens, and the third lens, the fourth lens and the fifth lens are arranged in sequence along the direction toward the aperture stop, and the third lens is configured as a biconcave spherical lens.

[0009] In an embodiment of the present invention, the fourth lens is configured as a biconvex spherical lens, and the fifth lens is configured as a biconcave spherical lens.

[0010] In an embodiment of the present invention, the side of the second lens facing the aperture is bonded to the side of the third lens facing away from the aperture;

[0011] And / or, a side of the fourth lens facing the aperture is bonded to a side of the fifth lens facing away from the aperture.

[0012] In the embodiment of the present invention, the first lens is made of plastic material, and the second lens, the third lens, the fourth lens and the fifth lens are all made of glass material.

[0013] In an embodiment of the present invention, the side of the first lens facing away from the aperture is set as a first aspheric surface, and the side of the first lens facing the aperture is set as a second aspheric surface. At least two of the aspheric coefficients α1, α2, α3, α4, α5, α6, α7, and α8 of the first aspheric surface and the second aspheric surface are not zero.

[0014] In the embodiment of the present invention, the aspheric coefficients α1, α4, α5, α6, α7, and α8 of the first aspheric surface and the second aspheric surface are set to 0.

[0015] In an embodiment of the present invention, the relay lens also includes a filter wheel, which is rotatably arranged on a side of one of the lens modules facing away from the aperture and close to the image side. A plurality of first filters are provided on the filter wheel, and the filter wheel is used to drive any one of the first filters to rotate to the position of the corresponding lens module.

[0016] In order to achieve the above object, the present invention further provides a sample detection device, which includes the relay lens described above.

[0017] Through the above technical solution, the relay lens and sample detection device provided by the embodiment of the present invention have the following beneficial effects:

[0018] In the technical solution of the present utility model, the fluorescence generated by the object is sequentially passed through the lens module on one side of the aperture of the relay lens, the aperture, and the lens module on the other side of the aperture. The lens modules on both sides of the aperture each include a first lens, a second lens, and a lens group arranged in sequence in a direction close to the aperture. Both optical surfaces of the first lens are convex and aspherical, and the Abbe number of the second lens is greater than that of the first lens. By arranging two lens modules on either side of the aperture and combining the first lens, second lens, and lens group in each lens module, the relay lens increases the aperture, effectively controls the object distance, image distance, and magnification, and significantly improves the fluorescence collection capability while ensuring clarity and observation field of view, and eliminates chromatic aberration.

[0019] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the drawings:

[0021] Figure 1 This is a schematic structural diagram of a relay lens according to one embodiment of the present utility model;

[0022] Figure 2 This is the MTF performance of the relay lens in the 500nm to 530nm band according to one embodiment of the present invention;

[0023] Figure 3 This is the MTF performance of the relay lens in the 554nm to 576nm band according to one embodiment of the present invention;

[0024] Figure 4 This is the MTF performance of the relay lens in the 592nm to 626nm band according to one embodiment of the present invention;

[0025] Figure 5 This is the MTF performance of the relay lens in the 660nm to 700nm band according to one embodiment of the present invention;

[0026] Figure 6 This is a spot diagram representation of the relay lens in the 500nm to 530nm band according to one embodiment of the present invention;

[0027] Figure 7 This is a spot diagram representation of the relay lens in the 554nm to 576nm band according to one embodiment of the present invention;

[0028] Figure 8 This is a spot diagram representation of the relay lens in the 592nm to 626nm band according to one embodiment of the present invention;

[0029] Figure 9 This is a spot diagram representation of the relay lens in the 660nm to 700nm band according to one embodiment of the present invention.

[0030] Description of Reference Numerals

[0031] 1 Aperture 233 Fifth lens

[0032] 2 Lens module 3 First filter

[0033] 21 First lens 4 Window

[0034] 22 Second lens 20 Consumables

[0035] 23 lens group 30 second filter

[0036] 231 Third lens 31 Photosensitive chip

[0037] 232 fourth lens 32 sealing sheet DETAILED DESCRIPTION

[0038] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0039] The relay lens of the present invention will be described below with reference to the accompanying drawings.

[0040] It should be noted that in the prior art, the lenses used for fluorescence collection in sample detection equipment generally include large aperture macro lenses, all-glass relay lenses and high-magnification microscope objectives with large numerical aperture. Among them, the large aperture macro lens has a large object distance and a small object-side numerical aperture, which is not conducive to collecting fluorescence. In addition, the large aperture macro lens has a small back focal length, and it is very difficult to install a filter wheel between the lens and the image sensor, which is not conducive to achieving multi-channel monochrome imaging. The all-glass relay lens has obvious chromatic aberration, and the object distance needs to be adjusted when switching from the narrow green light band to the narrow red light band for taking pictures. In addition, the imaging speed is slow and the fluorescence collection ability is poor. Although the high-magnification microscope objective with a large numerical aperture has a strong fluorescence collection ability, the object distance is small and the observation field of view is small, and image stitching is required to meet the observation needs of a large field of view.

[0041] like Figure 1 As shown, the utility model provides a relay lens, which includes an aperture 1 and two lens modules 2. The two lens modules 2 are relatively arranged on both sides of the aperture 1. Each lens module 2 includes a first lens 21, a second lens 22 and a lens group 23, and the first lens 21, the second lens 22 and the lens group 23 are arranged in sequence along the direction toward the aperture 1. The first lens 21 is set to be a biconvex aspheric lens, and the Abbe number of the second lens 22 is greater than the Abbe number of the first lens 21.

[0042] Specifically, the relay lens can be used in a sample detection device to collect fluorescence to perform fluorescence imaging on the sample. The sample is contained in the consumable 20. The side where the consumable 20 is located is the object side, which is the left side of the aperture 1. The excitation light source passes through the consumable 20 and shines on the sample to excite the sample to produce fluorescence. The fluorescence generated by the sample passes through the consumable 20 from the object side to the relay lens and shines on the camera through the relay lens. The side where the camera is located is the image side, which is the right side of the aperture 1. The fluorescence passes through the relay lens and passes through the lens module 2 on the left side of the aperture 1, the aperture 1, and the lens module 2 on the right side of the aperture 1 in sequence. Among them, the lens module 2 on the left side of the aperture 1 can gather fluorescence so that the fluorescence passes through the aperture 1 and illuminates the lens module 2 on the right side of the aperture 1. The lens module 2 on the right side of the aperture 1 conducts and converges the fluorescence so that the fluorescence illuminates the camera on the image side. In addition, the lens modules 2 on both sides of the aperture 1 include a first lens 21, a second lens 22 and a lens group 23 arranged in sequence along the direction close to the aperture 1. Both sides of the first lens 21 are convex surfaces, and both sides of the first lens 21 are aspherical surfaces, which is conducive to increasing the aperture. The Abbe number of the second lens 22 is greater than the Abbe number of the first lens 21, which is conducive to eliminating chromatic aberration.

[0043] The relay lens of the embodiment of the present invention increases the aperture by arranging two lens modules 2 on both sides of the aperture 1, and the combination of the first lens 21, the second lens 22 and the lens group 23 in each lens module 2, thereby effectively controlling the object distance, the image distance and the magnification. While ensuring the clarity and the observation field of view, the fluorescence collection capability is greatly improved, the chromatic aberration is eliminated, and the accuracy and reliability of the sample detection are thereby improved.

[0044] Furthermore, the two lens modules 2 of the present application are relatively arranged on both sides of the aperture 1, and the aperture 1 is located between the two lens modules 2. It is not limited to the two lens modules 2 being symmetrically arranged on both sides of the aperture 1. The two lens modules 2 can also be basically symmetrically arranged. As long as in each lens module 2, the first lens 21, the second lens 22 and the lens group 23 are arranged in sequence along the direction close to the aperture 1, they should fall within the protection scope of the present application. The relay lens of the present invention does not limit the distance between each lens module 2 and the aperture 1, the distance between the first lens 21 and the second lens 22, and the distance between the second lens 22 and the lens group 23 in each lens module 2.

[0045] In the embodiment of the present invention, the Abbe number of the second lens 22 is set to be greater than or equal to 68, so that the second lens 22 has the advantages of low dispersion and slight dispersion phenomenon. The refractive index difference of the second lens 22 for light of different wavelengths is small, which further eliminates chromatic aberration and improves imaging clarity.

[0046] In an embodiment of the present invention, the second lens 22 is configured as a biconvex spherical lens, the lens group 23 includes a third lens 231, a fourth lens 232 and a fifth lens 233, and the third lens 231, the fourth lens 232 and the fifth lens 233 are arranged in sequence along the direction toward the aperture 1, and the third lens 231 is configured as a biconcave spherical lens.

[0047] like Figure 1 As shown, each lens module 2 includes a first lens 21, a second lens 22, a third lens 231, a fourth lens 232 and a fifth lens 233. The two lens modules 2 are symmetrically or substantially symmetrically arranged on both sides of the aperture 1. The first lens 21, the second lens 22, the third lens 231, the fourth lens 232 and the fifth lens 233 are arranged in sequence along the direction close to the aperture 1. Both sides of the second lens 22 are convex, and both sides of the second lens 22 are spherical. Both sides of the third lens 231 are concave, and both sides of the third lens 231 are spherical. The relay lens is arranged on both sides of the aperture 1 by the two lens modules 2 and the optimized combination of the first lens 21, the second lens 22, the third lens 231, the fourth lens 232 and the fifth lens 233 in each lens module 2. This not only eliminates chromatic aberration and improves imaging clarity, but also effectively controls object distance, image distance and magnification, and has a strong fluorescence collection capability.

[0048] Furthermore, the fourth lens 232 is configured as a biconvex spherical lens, and the fifth lens 233 is configured as a biconcave spherical lens. Figure 1 As shown, the fourth lens 232 is arranged between the third lens 231 and the fifth lens 233. Both sides of the fourth lens 232 are convex, and both sides of the fourth lens 232 are spherical. Both sides of the fifth lens 233 are concave, and both sides of the fifth lens 233 are spherical. The combination of the fourth lens 232 and the fifth lens 233 can further reduce chromatic aberration and improve image clarity.

[0049] In the embodiment of the present invention, the side of the second lens 22 facing the aperture 1 is bonded to the side of the third lens 231 facing away from the aperture 1; the side of the fourth lens 232 facing the aperture 1 is bonded to the side of the fifth lens 233 facing away from the aperture 1. Figure 1 As shown, the side of the second lens 22 facing the aperture 1 is matched and fitted with the side of the third lens 231 facing away from the aperture 1, and the side of the fourth lens 232 facing the aperture 1 is matched and fitted with the side of the fifth lens 233 facing away from the aperture 1, which effectively reduces chromatic aberration and light loss and improves image clarity.

[0050] Moreover, in a preferred embodiment of the present invention, the side of the second lens 22 facing the aperture 1 is glued to the side of the third lens 231 facing away from the aperture 1 to form a doublet lens, and the side of the fourth lens 232 facing the aperture 1 is glued to the side of the fifth lens 233 facing away from the aperture 1 to form a doublet lens, which can effectively reduce chromatic aberration and light loss, improve imaging quality, simplify processing and assembly procedures, and reduce errors.

[0051] In an embodiment of the present invention, the first lens 21 is made of plastic, and the second lens 22, the third lens 231, the fourth lens 232, and the fifth lens 233 are all made of glass. Specifically, the first lens 21 is a biconvex plastic aspheric lens, the second lens 22 is a biconvex glass spherical lens with an Abbe number greater than or equal to 68, the third lens 231 is a biconcave glass spherical lens and is cemented with the second lens 22 to form a doublet, the fourth lens 232 is a biconvex glass spherical lens, and the fifth lens 233 is a biconcave glass spherical lens and is cemented with the fourth lens 232 to form a doublet. The first lens 21 is made of plastic and both of its optical surfaces are aspheric, which increases the aperture, improves the fluorescence collection capability, widens the field of view, and improves the imaging clarity. The third lens 231, the fourth lens 232, and the fifth lens 233 are made of glass, and the second lens 22 is made of low-dispersion glass, which eliminates overall chromatic aberration and improves imaging quality.

[0052] In the embodiment of the present invention, the relay lens further comprises a filter wheel, which is rotatably arranged on a side of one of the lens modules 2 facing away from the aperture 1 and close to the image side. The filter wheel is provided with a plurality of first filters 3, and the filter wheel is used to drive any one of the first filters 3 to rotate to the position corresponding to the lens module 2. Figure 1 As shown, the two lens modules 2 are symmetrically or substantially symmetrically arranged so that the back focal length of the relay lens is increased, which facilitates the arrangement of a filter wheel between the lens module 2 on the right side of the aperture 1 and the image side. The filter wheel rotates to switch the first filter 3 corresponding to the lens module 2, which is beneficial to the rapid acquisition of multi-channel and multi-sample images.

[0053] Furthermore, the filter wheel can be driven by a motor in the prior art, and the motor is connected to the filter wheel to drive the filter wheel to rotate, so that the filter wheel drives any first filter 3 to rotate into the imaging light path of the relay lens, further improving the imaging speed.

[0054] Further, if Figure 1As shown, the relay lens further includes a window 4, which is disposed between the lens module 2 and the object side on the left side of the aperture 1. The window 4 is used to protect the lens module 2 and allow fluorescence to pass through. The fluorescence passes through the relay lens from the object side and illuminates the camera. A second filter 30 is disposed at the camera window. The second filter 30 can be a long-bandpass filter. A photosensitive chip 31 is disposed within the camera. A sealing sheet 32 ​​is disposed on the photosensitive chip 31 for sealing the photosensitive chip 31. The sealing sheet 32 ​​can be sealing glass.

[0055] In one embodiment of the present invention, as shown in Table 1, Table 1 is a table of optical path parameters of a sample, consumables 20, a relay lens, and a camera. Serial number 1 is a sample. The excitation light source irradiates the sample so that the sample is stimulated to produce fluorescence. The fluorescence sequentially passes through the consumables 20, the window 4, the lens module 2 on the left side of the aperture 1, the aperture 1, the lens module 2 on the right side of the aperture 1, the first filter 3, the second filter 30, and the sealing sheet 32 ​​to irradiate the photosensitive chip 31. Among them, the side of the first lens 21 facing away from the aperture 1 is set as a first aspheric surface, and the second lens 21 is set as a second aspheric surface. The side of a lens 21 facing the aperture 1 is set as a second aspheric surface, serial number 6 is the first aspheric surface of the first lens 21 on the left side of the aperture 1, serial number 7 is the second aspheric surface of the first lens 21 on the left side of the aperture 1, serial number 9 is the bonding surface of the second lens 22 and the third lens 231 on the left side of the aperture 1, serial number 12 is the bonding surface of the fourth lens 232 and the fifth lens 233 on the left side of the aperture 1, serial number 14 is the aperture 1, and the lens module 2 on the right side of the aperture 1 is symmetrically or substantially symmetrically arranged with the lens module 2 on the left side of the aperture 1. The relay lens not only eliminates chromatic aberration but also controls the object distance within 50 mm through the two relatively arranged lens modules 2 and the optimized combination of the first lens 21, the second lens 22, the third lens 231, the fourth lens 232 and the fifth lens 233 in each lens module 2, and makes the object side numerical aperture as high as 0.166, the image space F / # (image space F number) as low as 1.4, the working F / # (working F number) as low as 3.0, and the target surface size reaches φ9.2 mm. While ensuring clarity and observation field of view, the fluorescence collection capability is greatly improved, and the back focal length is increased so that a filter wheel can be installed between the lens module 2 on the right side of the aperture 1 and the camera. The filter wheel is used to switch the first filter 3 corresponding to the lens module 2, which is conducive to the rapid acquisition of multi-channel images.

[0056] Table 1 Optical path parameters of samples, consumables 20, relay lens and camera

[0057]

[0058]

[0059] Furthermore, the even aspheric surface shape follows the following formula:

[0060]

[0061] Among them, z is the vector height, r is the radial coordinate, c is the curvature, the curvature is equal to the inverse of the curvature radius, k is the cone coefficient, α1, α2, α3, α4, α5, α6, α7, and α8 are all aspheric coefficients.

[0062] In an embodiment of the present invention, the side of the first lens 21 facing away from the aperture 1 is set as a first aspheric surface, and the side of the first lens 21 facing the aperture 1 is set as a second aspheric surface. At least two of the aspheric coefficients α1, α2, α3, α4, α5, α6, α7, and α8 of the first aspheric surface and the second aspheric surface are not zero, so as to increase the aperture of the relay lens and improve the fluorescence collection capability and imaging clarity.

[0063] In one embodiment of the present invention, the aspheric coefficients α1, α5, α6, α7, and α8 of the first aspheric surface and the second aspheric surface are set to 0, and the aspheric coefficients α2, α3, and α4 of the first aspheric surface and the second aspheric surface are not 0, so as to increase the aperture of the relay lens and improve the fluorescence collection capability and imaging clarity.

[0064] In another embodiment of the present invention, the aspheric coefficients α1, α4, α5, α6, α7, and α8 of the first aspheric surface and the second aspheric surface are set to 0, and the aspheric coefficients α2 and α3 of the first aspheric surface and the second aspheric surface are not 0, so as to increase the aperture of the relay lens, improve the fluorescence collection capability and imaging clarity, simplify the surface shapes of the first aspheric surface and the second aspheric surface, reduce the processing difficulty of the first lens 21, and thus save production costs.

[0065] Specifically, according to Table 1, number 6 is the first aspheric surface of the first lens 21 on the left side of the aperture 1, number 7 is the second aspheric surface of the first lens 21 on the left side of the aperture 1, number 21 is the second aspheric surface of the first lens 21 on the right side of the aperture 1, and number 22 is the first aspheric surface of the second lens 22 on the right side of the aperture 1. As shown in Table 2, Table 2 is a parameter table of the conic coefficient and aspheric coefficient of the aspheric surface.

[0066] Table 2 Conic coefficients and parameters of aspheric coefficients of aspheric surfaces

[0067] Serial number k <![CDATA[α1]]> <![CDATA[α2]]> <![CDATA[α3]]> <![CDATA[α4]]> <![CDATA[α5]]> <![CDATA[α6]]> <![CDATA[α7]]> <![CDATA[α8]]> 6 1.3329 0 3.2819E-6 8.2251E-9 0 0 0 0 0 7 -3.6285 0 9.1167E-6 1.9866E-8 0 0 0 0 0 21 -3.6285 0 -9.1167E-6 -1.9866E-8 0 0 0 0 0 22 1.3329 0 -3.2819E-6 -8.2251E-9 0 0 0 0 0

[0068] According to the parameters in Table 1 and Table 2, a relay lens was made and fluorescence imaging tests were carried out under different channel excitation light sources. The generated MTF (Modulation Transfer Function) is shown as follows: Figures 2 to 5 As shown, the spot diagram appears as Figures 6 to 9 As shown. Figures 2 to 5The MTF performance shown in the figure shows that the MTF values ​​at 183lp / mm (Nyquist spatial frequency of the photosensitive chip 31) in each field of view of the four narrow bands are all above 0.3, and the image clarity is high. Figures 6 to 9 The point diagram shown shows that the light spots in each field of view of the four narrow bands are all within the range of the Airy disk (the maximum radius of the Airy disk is 2.481μm), and are smaller than the pixel particle size of the camera (the pixel particle size is 2.74μm). This effectively controls aberrations and greatly improves the resolution. The resolution reaches 2.74μm, allowing clear fluorescent imaging of bacteria and other microorganisms. The object height is 9.232mm, the image height is 9.242mm, and the imaging is close to 1:1. The target surface size reaches φ9.2mm, which provides a wide field of view and allows objects within a large range to be captured without image stitching.

[0069] In addition, the present invention also provides a sample detection device, which includes the relay lens described above, and the specific structure of the relay lens refers to the above embodiment. Since the sample detection device adopts all the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0070] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0071] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0073] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A relay lens, characterized in that: The relay lens includes: Aperture (1); Two lens modules (2), the two lens modules (2) are arranged oppositely on both sides of the aperture (1), each lens module (2) comprises a first lens (21), a second lens (22) and a lens group (23), and the first lens (21), the second lens (22) and the lens group (23) are arranged in sequence in a direction toward the aperture (1), the first lens (21) is a biconvex aspheric lens, and the Abbe number of the second lens (22) is greater than the Abbe number of the first lens (21).

2. The relay lens according to claim 1, wherein: The Abbe number of the second lens (22) is set to be greater than or equal to 68.

3. The relay lens according to claim 1, wherein: The second lens (22) is configured as a biconvex spherical lens, the lens group (23) includes a third lens (231), a fourth lens (232) and a fifth lens (233), and the third lens (231), the fourth lens (232) and the fifth lens (233) are arranged in sequence in a direction toward the aperture (1), and the third lens (231) is configured as a biconcave spherical lens.

4. The relay lens according to claim 3, wherein: The fourth lens (232) is configured as a biconvex spherical lens, and the fifth lens (233) is configured as a biconcave spherical lens.

5. The relay lens according to claim 4, wherein: The side of the second lens (22) facing the aperture (1) is bonded to the side of the third lens (231) facing away from the aperture (1); And / or, the side of the fourth lens (232) facing the aperture (1) is bonded to the side of the fifth lens (233) facing away from the aperture (1).

6. The relay lens according to claim 3, wherein: The first lens (21) is made of plastic material, and the second lens (22), the third lens (231), the fourth lens (232) and the fifth lens (233) are all made of glass material.

7. The relay lens according to any one of claims 1 to 6, wherein: The side of the first lens (21) facing away from the aperture (1) is set as a first aspheric surface, and the side of the first lens (21) facing the aperture (1) is set as a second aspheric surface, and at least two of the aspheric coefficients α1, α2, α3, α4, α5, α6, α7, and α8 of the first aspheric surface and the second aspheric surface are not zero.

8. The relay lens according to claim 7, wherein: The aspheric coefficients α1, α4, α5, α6, α7, and α8 of the first aspheric surface and the second aspheric surface are set to 0.

9. The relay lens according to any one of claims 1 to 6, wherein: The relay lens further comprises a filter wheel, which is rotatably arranged on a side of one of the lens modules (2) facing away from the aperture (1) and close to the image side, and a plurality of first filters (3) are arranged on the filter wheel, and the filter wheel is used to drive any one of the first filters (3) to rotate to a position corresponding to the lens module (2).

10. A sample detection device, characterized in that: The sample detection device comprises the relay lens according to any one of claims 1 to 9.

Images