CN117891049A - Large-caliber refraction type dispersion lens - Google Patents

Abstract

The invention provides a large-caliber refraction type dispersion lens, which consists of a plurality of lens groups, and sequentially comprises a first lens group, a second lens group and a third lens group along the transmission direction of light. The first lens group consists of a plano-convex lens and two meniscus lenses, the second lens group is an achromatic lens group and consists of a double cemented lens and a plano-convex lens, and the third lens group consists of three single lenses. On the premise of meeting the basic requirements of a spectrum confocal dispersion lens, the invention realizes the good focusing of light with different wavelengths at different positions in a visible light wave band, simultaneously achieves the resolution of 1 mu m, can display a target more clearly, and is very beneficial to the application of observing tiny details or high-resolution imaging. Compared with the existing dispersion lens, the dispersion lens provided by the invention can collect more light rays by increasing the caliber of the dispersion lens, provide higher light collection capacity and increase the brightness of an image.

Description

Large-caliber refraction type dispersion lens

Technical Field

The invention relates to the technical field of optics, in particular to a large-caliber refraction type dispersion lens for imaging and observation application in an optical system.

Background

The dispersive objective lens, which is the most central component of the spectral confocal sensor, can be divided into two basic types, refractive and diffractive, which use different principles to achieve the dispersive effect. Refractive dispersion objectives are based on the principle of refraction of light in a medium, and are typically represented by prisms, which are suitable for use in situations where the wavelength range is narrow. The diffraction type dispersion objective lens has wider wavelength adaptability and higher resolution based on diffraction phenomenon when light passes through elements such as a grating and the like, and is commonly used for scenes needing to process continuous spectrum and high-resolution spectrum analysis. The selection of a suitable dispersive objective lens depends on the requirements of the particular application, including wavelength range, resolution requirements, and the size of the optical system.

In prior art solutions, using a diffractive dispersive objective lens, it is often necessary to use a diaphragm to limit the size and angle of the incident light to ensure that the grating (or other diffractive element) is functioning properly and producing the desired diffractive effect, which makes it possible to manufacture and calibrate a high performance diffractive objective lens more complex and expensive than a refractive objective lens.

The resolution of a general dispersive objective lens is in the range of tens to thousands of micrometers, and with the push of scientific research, industrial application and technical progress, the requirement for the resolution of the dispersive objective lens is gradually increasing. This trend stems primarily from the urgent need for finer, more accurate optical analysis, and the increasing challenges of high resolution imaging and spectrometry.

Disclosure of Invention

In view of the above, the present invention is directed to a large-caliber refractive dispersion lens, which is suitable for imaging and observation applications in an optical system, and adopts a refractive dispersion lens, and has the advantages of simple structure, easy manufacturing, low cost, and improved resolution of the dispersion lens, so that the measurement result is finer.

In view of the above, the present invention provides a large-caliber refractive dispersion lens, which is composed of a plurality of lens groups, comprising the following components:

a first lens group: consists of a plano-convex lens and two meniscus lenses, is used for focusing light rays and eliminating spherical aberration and astigmatism;

a second lens group: consists of a double-cemented lens and a plano-convex lens, is used for achromatizing and correcting spherical aberration and astigmatism of points on an axis;

a third lens group: the lens consists of three single lenses, and is used for focusing and introducing different chromatic aberration to realize the adjustment of the focal positions of light rays with different wavelengths.

As a further scheme of the invention, the two meniscus lenses are a first meniscus lens and a second meniscus lens respectively, the convex surface of the plano-convex lens of the first lens group faces the image side along the light propagation direction, the first meniscus lens faces the image side, the second meniscus lens faces the object side, and the plano-convex lens, the first meniscus lens and the second meniscus lens form the first lens group together.

As a further aspect of the present invention, the focal length of the first lens group is-9.458 e+004mm.

As a further aspect of the present invention, the refractive index and the abbe number of each lens in the first lens group respectively range from:

plano-convex lens L1: the refractive index ND1 is 1.75< ND1<1.77, the Abbe number VD1 is 27.5< VD1<27.7, the thickness is 14mm, and the focal length is 160.6mm;

first meniscus lens L2: the refractive index ND2 is 1.75< ND2<1.77, the Abbe number VD2 is 27.5< VD2<27.7, the thickness is 12mm, and the focal length is-322.3 mm;

a second meniscus lens L3: the refractive index ND3 is 1.75< ND3<1.77, the Abbe number VD3 is 27.5< VD3<27.7, the thickness is 15mm, and the focal length is 72.5mm.

As a further aspect of the present invention, in the second lens group, a plane convex lens of the second lens group faces an image side along a light propagation direction, and the plane convex lens and the double cemented lens in the second lens group together form an achromatic lens group.

As a further aspect of the present invention, the achromatic lens group has a focal length of 98.047mm.

As a further aspect of the present invention, the bicontinuous lens in the second lens group is composed of a lens L4 and a lens L5, the plano-convex lens in the second lens group is composed of a lens L6, and the refractive index and the abbe number range of each lens in the second lens group are respectively:

lens L4: the refractive index ND4 satisfies 1.72< ND4<1.74, the Abbe number VD4 satisfies 37.8< VD4<38.0, the thickness is 24mm, and the focal length is 591.2mm.

Lens L5: the refractive index ND5 satisfies 1.75< ND5<1.77, the Abbe number VD5 satisfies 27.5< VD5<27.7, the thickness is 10mm, and the focal length is 250.0mm.

Lens L6: the refractive index ND6 satisfies 1.75< ND6<1.77, the Abbe number VD6 satisfies 27.5< VD6<27.7, the thickness is 12mm, and the focal length is 200.1mm.

As a further scheme of the present invention, the three single lenses of the third lens group are a first focusing lens, a second focusing lens and a third meniscus lens which are respectively arranged along the light propagation direction, and the three single lenses jointly form a focusing lens group with a focal length of 70.81mm.

As a further aspect of the present invention, the refractive index and abbe number ranges of the three single lenses in the third lens group are respectively:

third meniscus lens L7: the refractive index ND7 is 1.74< ND7<1.76, the Abbe number VD7 is 44.8< VD7<45.0, the thickness is 14mm, and the focal length is-192.7 mm;

first focus lens L8: the refractive index ND8 is 1.75< ND8<1.77, the Abbe number VD8 is 27.5< VD8<27.6, the thickness is 12mm, and the focal length is 97.4mm;

second focus lens L9: the refractive index ND9 satisfies 1.47< ND9<1.49, the Abbe number VD9 satisfies 70.3< VD9<70.5, the thickness is 12mm, and the focal length is 89.7mm.

As a further scheme of the invention, the resolution of the large-caliber refractive dispersion lens reaches 1 mu m, and the relative illuminance in the full-wave band range of 480nm-660nm is more than or equal to 99%.

Compared with the prior art, the large-caliber refraction type dispersion lens provided by the invention has the following beneficial effects:

1. uniform dispersion effect over a wide wavelength range: the lens can provide consistent dispersion effect in a wide wavelength range, and is suitable for processing light rays with different wavelengths.

2. The design is simple and the manufacturing is easy: the dispersive lens is relatively simple in design and easy to manufacture, thereby reducing cost. In addition, the method has higher tolerance on the wave front shape and wider applicability.

3. Good focusing effect and high resolution: the dispersion lens can realize good focusing of light rays with different wavelengths at different positions, has high resolution, and the minimum resolution can reach 1 mu m. This enables it to clearly display objects, suitable for viewing fine details or for high resolution imaging.

4. And (3) large-caliber design: the dispersion lens has a large caliber, the maximum caliber can reach 72.4mm, and the maximum caliber is increased by 57.4% compared with the existing dispersion lens. This allows it to collect more light, provide higher light acquisition capability, increase the brightness of the image, and help provide a wider field of view, reduce speckle, and be advantageous for applications requiring high focusing and reduced aberrations.

5. Adapting a large target surface CCD: the dispersion lens can be adapted to a large target surface CCD, and can be maximally adapted to a CCD target surface of 57.34 mm. This provides a higher image resolution suitable for applications requiring high image details. Meanwhile, the design adapting to the large target surface is beneficial to reducing distortion and improving imaging quality.

6. Good relative illuminance: the dispersion lens can achieve the effect that the relative illuminance is more than 99% in the whole wave band range of 480nm-660 nm. This is advantageous for improving the overall brightness uniformity of the image, reducing or eliminating shadow effects, and improving the image quality.

In summary, the invention provides a large-caliber refractive dispersion lens, which has the characteristics of consistent dispersion effect in a wide wavelength range, simple design, easy manufacture, good imaging quality and high light acquisition capability. The dispersion lens is suitable for processing light from different wavelengths and can realize good focusing and resolution at different wavelengths. The dispersion lens has larger caliber, can collect more light rays, and provides wider view field and higher image resolution.

The dispersion lens of the invention has the advantages of relatively simple design, easy manufacture, relatively low cost and suitability for mass production. The light source has certain tolerance to an optical system of a non-point source or a non-monochromatic light source, and can adapt to the requirements of different light sources and scenes. In addition, the dispersion lens has good relative illumination in the whole wave band range, ensures that the illumination distribution of the image is more uniform, and improves the consistency and quality of the overall brightness of the image. This is very important for scenes with high dispersion and imaging quality requirements in various applications, has a wide application prospect, and can be used in various fields, such as optical microscopes, photographic lenses, astronomical telescopes and the like, so as to provide high-quality imaging and dispersion effects.

These and other aspects of the present application will be more readily apparent from the following description of the embodiments. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art.

In the figure:

fig. 1 is a schematic diagram of a basic structure of a large-caliber refractive dispersion lens according to an embodiment of the present invention.

FIG. 2 is a graph showing the focal length of a large-caliber refractive dispersion lens in the wavelength band of 480nm to 660nm according to an embodiment of the present invention.

Fig. 3 is a point diagram of a large-caliber refractive dispersion lens according to an embodiment of the present invention at an operating wavelength of 550 nm.

Fig. 4 is a graph showing the relative illuminance of the dispersion attack of the large-caliber refractive dispersion lens according to the embodiment of the present invention.

Fig. 5 is a schematic diagram of the basic principle of a spectral confocal sensor in a 2D spectral confocal measurement technique.

Detailed Description

The present application will be further described with reference to the drawings and detailed description, which should be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.

Developments in 2D spectral confocal measurement technology benefit from advances in the fields of optics and spectroscopy. With the increasing demands of scientific and industrial research for more detailed and comprehensive analysis, modern spectroscopic instruments are increasingly able to acquire data with higher accuracy and resolution thanks to the continual innovations of laser technology, detector technology and data processing algorithms. The traditional one-dimensional spectrum can only provide sample information on one spectrum axis, and the 2D spectrum confocal measurement technology can acquire the spectrum information on two dimensions at the same time, so that the structure, dynamic process and the like of the sample are more clearly presented. This advanced technique provides a more accurate means for analyzing complex samples. With the progress of optical and spectroscopy fields, the development and application fields of the 2D spectrum confocal measurement technology cover a plurality of scientific fields including biomedical fields, material science, environmental monitoring and the like, and a stronger analysis tool is provided for scientific research and industrial application.

The spectral confocal sensor mainly comprises a dispersion objective lens, a light source, a receiving detector and the like, and the working principle of the spectral confocal sensor is shown in figure 5. When the object to be measured is located in the dispersive region, only light focused on the surface of the object can be returned in the primary path and enter the spectrometer through the pinhole, while light of other wavelengths (i.e. light focused at other heights) is blocked by the pinhole. Of the light entering the pinhole, the light energy corresponding to the peak wavelength is the strongest, while the light energy of other wavelengths is relatively weaker. By the calibration information, the specific position of the measured object can be judged according to the peak wavelength. It is worth noting that the spectral confocal sensor does not need to perform axial scanning, so that the sampling frequency is remarkably improved, and an advanced technical means is provided for efficient and accurate sample analysis.

The chromatic dispersion objective lens is the most core component of the spectral confocal sensor, and has the functions of focusing light rays with different wavelengths at different heights at axial positions, wherein the axial chromatic aberration influences the measurement range of the spectral confocal microscope, and the linearity degree of chromatic aberration and wavelength influences the measurement sensitivity or resolution. Unlike conventional achromatic microscopes, dispersive objectives strive to obtain a large axial chromatic aberration.

Potential customers of spectral confocal sensors mainly include scientific research institutions, life sciences and medical fields, pharmaceutical industry, chemical analysis laboratories, materials science research, environmental monitoring, food safety and quality control, and the like. These fields have demands for high-resolution optical and spectroscopic data, and spectral confocal sensors have wide application potential in biomedical research, material analysis, environmental monitoring, and the like.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

In designing a dispersive objective lens, first the choice of materials needs to be considered to ensure that it has the proper dispersive properties. The shape and curvature adjustments can be used to control the dispersion effect to achieve the desired optical performance. Wavelength range and resolution requirements are critical considerations, and appropriate design parameters should be selected for a particular application. For multi-wavelength systems, it is contemplated to implement a multi-channel design to efficiently process light of different wavelength ranges. The final design should be verified through experimentation and optimization to ensure that the dispersive objective is able to meet the specific requirements of the spectral confocal sensor. Compensation means to account for chromatic dispersion is also required during the design process to ensure good performance in the optical system.

Since dispersion lenses can be classified into two basic types of refractive and diffractive, they use different principles to achieve a dispersion effect. Refractive dispersion objectives are based on the principle of refraction of light in a medium, and are typically represented by prisms, which are suitable for use in situations where the wavelength range is narrow. The diffraction type dispersion objective lens has wider wavelength adaptability and higher resolution based on diffraction phenomenon when light passes through elements such as a grating and the like, and is commonly used for scenes needing to process continuous spectrum and high-resolution spectrum analysis. The selection of a suitable dispersive objective lens depends on the requirements of the particular application, including wavelength range, resolution requirements, and the size of the optical system.

In prior art solutions, using a diffractive dispersive objective lens, it is often necessary to use a diaphragm to limit the size and angle of the incident light to ensure that the grating (or other diffractive element) is functioning properly and producing the desired diffractive effect, which makes it possible to manufacture and calibrate a high performance diffractive objective lens more complex and expensive than a refractive objective lens.

The resolution of a general dispersive objective lens is in the range of tens to thousands of micrometers, and with the push of scientific research, industrial application and technical progress, the requirement for the resolution of the dispersive objective lens is gradually increasing. This trend stems primarily from the urgent need for finer, more accurate optical analysis, and the increasing challenges of high resolution imaging and spectrometry.

In view of this, the present invention provides a large-caliber refractive dispersion lens, which adopts a refractive dispersion lens, and has the advantages of simple structure, easy manufacturing and low cost. In addition, the resolution of the dispersion lens can reach 1 mu m, and the measurement result is finer.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that, in the embodiments of the present invention, all the expressions "first" and "second" are used to distinguish two non-identical entities with the same name or non-identical parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

Referring to fig. 1, an embodiment of the present invention provides a large-caliber refractive dispersion lens composed of a plurality of lens groups, in which a first lens group, a second lens group, and a third lens group are sequentially included in a light transmission direction. Wherein,

referring to fig. 1, the first lens group is composed of one plano-convex lens and two meniscus lenses, and serves to focus light and eliminate spherical aberration and astigmatism. In this embodiment, the two meniscus lenses are a first meniscus lens and a second meniscus lens, respectively, and the convex surface of the plano-convex lens of the first lens group faces the image side along the light propagation direction, the first meniscus lens faces the image side, the second meniscus lens faces the object side, and the plano-convex lens, the first meniscus lens and the second meniscus lens form a first lens group with a focal length of-9.458 e+004mm.

Wherein, the refractive index and the Abbe number range of each lens in the first lens group are respectively:

plano-convex lens L1: the refractive index ND1 is 1.75< ND1<1.77, the Abbe number VD1 is 27.5< VD1<27.7, the thickness is 14mm, and the focal length is 160.6mm;

first meniscus lens L2: the refractive index ND2 is 1.75< ND2<1.77, the Abbe number VD2 is 27.5< VD2<27.7, the thickness is 12mm, and the focal length is-322.3 mm;

a second meniscus lens L3: the refractive index ND3 is 1.75< ND3<1.77, the Abbe number VD3 is 27.5< VD3<27.7, the thickness is 15mm, and the focal length is 72.5mm.

Referring to fig. 1, the second lens group is composed of a cemented doublet and a plano-convex lens for achromatizing and correcting spherical aberration and astigmatism of the on-axis point. In this embodiment, the plane of the plano-convex lens of the second lens group faces the image side along the light propagation direction, and the plano-convex lens and the doublet lens in the second lens group together form an achromatic lens group with a focal length of 98.047mm.

Wherein, the lens L4 and the lens L5 are constituteed to the doublet lens in the second lens group, the plano-convex lens in the second lens group comprises lens L6, and the refractive index and the scope of Abbe number of each lens in the second lens group are respectively:

lens L4: the refractive index ND4 satisfies 1.72< ND4<1.74, the Abbe number VD4 satisfies 37.8< VD4<38.0, the thickness is 24mm, and the focal length is 591.2mm.

Lens L5: the refractive index ND5 satisfies 1.75< ND5<1.77, the Abbe number VD5 satisfies 27.5< VD5<27.7, the thickness is 10mm, and the focal length is 250.0mm.

Lens L6: the refractive index ND6 satisfies 1.75< ND6<1.77, the Abbe number VD6 satisfies 27.5< VD6<27.7, the thickness is 12mm, and the focal length is 200.1mm.

Referring to fig. 1, the third lens group is composed of three single lenses for focusing and introducing different chromatic aberration to realize adjustment of focal positions of light rays of different wavelengths. In this embodiment, the three single lenses of the third lens group are a first focusing lens, a second focusing lens, and a third meniscus lens, which are disposed along the light propagation direction, respectively, and together form a focusing lens group with a focal length of 70.81mm.

Wherein, the refractive index and Abbe number ranges of the three single lenses in the third lens group are respectively:

third meniscus lens L7: the refractive index ND7 is 1.74< ND7<1.76, the Abbe number VD7 is 44.8< VD7<45.0, the thickness is 14mm, and the focal length is-192.7 mm;

first focus lens L8: the refractive index ND8 is 1.75< ND8<1.77, the Abbe number VD8 is 27.5< VD8<27.6, the thickness is 12mm, and the focal length is 97.4mm;

second focus lens L9: the refractive index ND9 satisfies 1.47< ND9<1.49, the Abbe number VD9 satisfies 70.3< VD9<70.5, the thickness is 12mm, and the focal length is 89.7mm.

Referring to FIG. 2, the focal shift curve of the large-caliber refractive dispersion lens in the wave band of 480nm to 660nm is shown in FIG. 2, and the focal shift curve in the wave band of 480nm to 660nm in FIG. 2 shows the relation between the wavelength and the focal position in the working wave band of 480nm to 660 nm.

Referring to fig. 3, fig. 3 is a point chart of the dispersive lens at an operating wavelength of 550 nm. The RMS radius of each view field of the point column diagram is within 1um, and the focusing effect is good, which means that the resolution of the lens can reach 1 mu m, and more accurate optical analysis can be performed. Fig. 4 is a graph of relative illuminance for a dispersion attack graph, the relative illuminance reaches 1.0, and the relative illuminance for lens imaging is close to 100%. The resolution of the large-caliber refraction type dispersion lens provided by the invention reaches 1 mu m, the relative illuminance in the full-wave band range of 480nm-660nm is more than or equal to 99%, and the dispersion lens provided by the invention has uniform illuminance at each field point of the system, thereby being beneficial to keeping consistent image quality in the whole view field.

Compared with the prior art, the large-caliber refraction type dispersion lens has various advantages as a refraction type dispersion objective lens, so that the refraction type dispersion lens can be widely applied to an optical system, and the main advantages comprise providing a uniform dispersion effect in a wide wavelength range, so that the dispersion lens is suitable for a system for processing light from different wavelengths; the refraction type dispersion lens uses optical elements such as a prism, has simple design, is easy to manufacture, has relatively low cost, and is easier to realize large-scale production; meanwhile, the refractive dispersion lens is relatively tolerant to the wave front shape of incident light. The optical system is more tolerant to non-point sources or non-monochromatic sources than some other dispersive elements, enhancing applicability under non-point sources or non-monochromatic sources.

Moreover, the large-caliber refraction type dispersion lens has good focusing effect and high resolution. On the premise of meeting the basic requirements of a spectrum confocal dispersion lens, the good focusing of light with different wavelengths at different positions is realized in a visible light wave band, meanwhile, the resolution of 1 mu m is achieved, the target can be displayed more clearly, and the method is very beneficial to the application of observing tiny details or high-resolution imaging. Compared with the existing dispersive lens, the large-caliber dispersive lens provided by the invention, such as Chinese patent No. CN115469433A, discloses a dispersive lens (see literature: suzhou university. A spectral confocal displacement sensor dispersive lens: CN202211168615.6.2022-12-13.) with a maximum caliber of 46mm. The large-caliber dispersion lens provided by the invention has the maximum caliber of 72.4mm and is increased by 57.4%. By increasing the aperture of the dispersive lens, more light can be collected.

Therefore, the dispersive lens proposed by the present invention has a light collection capacity 2.48 times that of the lens disclosed in patent CN115469433a, which can provide higher light collection capacity for optical systems, especially in low light conditions, increase the brightness of images, and at the same time help to provide a wider field of view, form smaller spots, and be advantageous for some applications requiring high focusing and reduced aberrations.

In addition, the dispersion lens provided by the invention is suitable for a large target surface CCD, and can be maximally adapted to a CCD target surface of 57.34mm, and the lens is adapted to the large target surface CCD, so that the following advantages can be brought: first, the larger field of view enables the camera system to capture a wider view, suitable for applications requiring a wide angle of view or covering a wide range. Secondly, the large target surface CCD provides higher image resolution, which is important for the application with high requirement on image details; the design of the adaptation large target surface is favorable for reducing the distortion of the lens and improving the imaging quality.

Moreover, the dispersion lens provided by the invention can achieve the effect that the relative illuminance is more than 99% in the full-wave band range of 480nm-660nm, has good relative illuminance, is beneficial to ensuring that the illumination distribution of the image on different view field positions is more uniform, thereby improving the overall brightness consistency of the image, being beneficial to reducing or eliminating the shadow effect in the image, and being particularly important for scenes with strict requirements on illumination uniformity, such as medical imaging, industrial detection and the like. And the method is also beneficial to improving the quality of the image and providing clearer and more accurate imaging performance for various applications.

The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.

It should be understood that as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items. The foregoing embodiment of the present invention has been disclosed with reference to the number of embodiments for the purpose of description only, and does not represent the advantages or disadvantages of the embodiments.

Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and many other variations of the different aspects of the embodiments of the invention as described above exist, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the embodiments should be included in the protection scope of the embodiments of the present invention.

Claims (9)

1. A large-caliber refractive dispersion lens, characterized in that the dispersion lens is composed of a plurality of lens groups, the dispersion lens comprises the following components:

a first lens group: the lens comprises a plano-convex lens and two meniscus lenses, wherein the plano-convex lens, the first meniscus lens and the second meniscus lens form a first lens group together;

a second lens group: consists of a double-cemented lens and a plano-convex lens, is used for achromatizing and correcting spherical aberration and astigmatism of points on an axis; in the second lens group, along the light propagation direction, the plane of the plano-convex lens of the second lens group faces towards the image space, and the plano-convex lens and the double-cemented lens in the second lens group form an achromatic lens group together;

a third lens group: the lens consists of three single lenses, is used for focusing and introducing different chromatic aberration, and realizes the adjustment of the focal positions of light rays with different wavelengths; the three single lenses of the third lens group are respectively a first focusing lens, a second focusing lens and a third meniscus lens which are arranged along the light propagation direction, and the three single lenses jointly form a focusing lens group.

2. The large-caliber refractive dispersion lens according to claim 1, wherein the plano-convex lens convex surface of the first lens group faces the image side in the light propagation direction, the first meniscus lens is bent toward the image side, and the second meniscus lens is bent toward the object side.

3. The large-caliber refractive dispersion lens according to claim 2, wherein the focal length of the first lens group is-9.458 e+004mm.

4. The large-caliber refractive dispersion lens according to claim 3, wherein the refractive index and abbe number of each lens in the first lens group are respectively in the following ranges:

plano-convex lens L1: the refractive index ND1 is 1.75< ND1<1.77, the Abbe number VD1 is 27.5< VD1<27.7, the thickness is 14mm, and the focal length is 160.6mm;

first meniscus lens L2: the refractive index ND2 is 1.75< ND2<1.77, the Abbe number VD2 is 27.5< VD2<27.7, the thickness is 12mm, and the focal length is-322.3 mm;

a second meniscus lens L3: the refractive index ND3 is 1.75< ND3<1.77, the Abbe number VD3 is 27.5< VD3<27.7, the thickness is 15mm, and the focal length is 72.5mm.

5. The large aperture refractive index dispersive lens of claim 4, wherein the focal length of the achromatic lens group is 98.047mm.

6. The large-caliber refractive dispersion lens according to claim 5, wherein the double cemented lens in the second lens group is composed of a lens L4 and a lens L5, the plano-convex lens in the second lens group is composed of a lens L6, and the refractive index and abbe number of each lens in the second lens group are respectively in the ranges:

lens L4: the refractive index ND4 is 1.72< ND4<1.74, the Abbe number VD4 is 37.8< VD4<38.0, the thickness is 24mm, and the focal length is 591.2mm;

lens L5: the refractive index ND5 is 1.75< ND5<1.77, the Abbe number VD5 is 27.5< VD5<27.7, the thickness is 10mm, and the focal length is 250.0mm;

lens L6: the refractive index ND6 satisfies 1.75< ND6<1.77, the Abbe number VD6 satisfies 27.5< VD6<27.7, the thickness is 12mm, and the focal length is 200.1mm.

7. The large-caliber refractive dispersion lens according to claim 6, wherein the focal length of the focusing lens group composed of the first focusing lens, the second focusing lens and the third meniscus lens is 70.81mm.

8. The large-aperture refractive-index dispersive lens according to claim 7, wherein the refractive index and abbe number ranges of the three single lenses in the third lens group are respectively:

third meniscus lens L7: the refractive index ND7 is 1.74< ND7<1.76, the Abbe number VD7 is 44.8< VD7<45.0, the thickness is 14mm, and the focal length is-192.7 mm;

first focus lens L8: the refractive index ND8 is 1.75< ND8<1.77, the Abbe number VD8 is 27.5< VD8<27.6, the thickness is 12mm, and the focal length is 97.4mm;

second focus lens L9: the refractive index ND9 satisfies 1.47< ND9<1.49, the Abbe number VD9 satisfies 70.3< VD9<70.5, the thickness is 12mm, and the focal length is 89.7mm.

9. The large-caliber refractive dispersion lens according to claim 8, wherein the resolution of the large-caliber refractive dispersion lens is up to 1 μm, and the relative illuminance in the full-band range of 480nm-660nm is not less than 99%.