Compensation imaging lens assembly and optical device under high dispersion

Abstract

The present invention relates to the technical field of optical systems, and in particular to a compensating imaging lens group and optical equipment under high dispersion, which are composed of a main lens group, an enhanced light reflecting mirror, a compensating perspective plane mirror, and a double-cemented lens group distributed in sequence along the light path direction; the double-cemented lens group includes: a first cemented lens, a convex lens with positive refractive power; a second cemented lens, a concave lens with negative refractive power; the first cemented lens and the second cemented lens are bonded without a gap; the application optimizes the clarity at the color edge, making the color edge of the image sharper and clearer, thereby improving the clarity of the image, significantly improving the accuracy and consistency of color reproduction, and significantly improving the overall imaging effect.

Description

Technical Field

[0001] The present invention relates to the technical field of optical systems, and in particular to a compensating imaging lens group and optical equipment under high dispersion. Background Art

[0002] As a precision optical element, the coaxial telecentric lens plays a vital role in many fields such as machine vision, scientific research and industrial production. It consists of multiple lenses, and the optical center of each lens is on the same straight line, which can make the image clearer and sharper, so as to magnify the image and improve the resolution. It consists of multiple carefully calculated and arranged lenses to ensure that the optical center of each lens is strictly on the same straight line, effectively reducing the distortion of light when passing through the lens, so that the final image is closer to the true form of the object.

[0003] like Figure 1 As shown in FIG. 1 , a lens group of an existing coaxial telecentric lens is shown, including a main lens group along the optical path direction and an enhanced light reflector, such as Figure 2 and Figure 3 It can be seen that the diffraction limit in this state is lower than 0.4. The light will bend and diffuse when passing through the lens group, causing the edges of the image to become blurred, which not only affects the clarity of the image, but also reduces the accuracy of color reproduction; and based on the Seidel coefficient evaluation of the optical path, the axial chromatic aberration is -0.049238, causing light of different wavelengths to be unable to focus on the same point on the imaging plane, thereby forming color spots or halos, which further leads to a significant decrease in image clarity and reduces the image quality. Summary of the invention

[0004] The purpose of the present invention is to provide a compensating imaging lens group and an optical device under high dispersion to solve the problem of poor imaging effect of the optical path in the prior art.

[0005] The technical solution of the present invention is: a compensating imaging lens group under high dispersion, which is composed of a main lens group, an enhanced light reflector, a compensating perspective plane mirror, and a double cemented lens group distributed in sequence along the light path direction;

[0006] The doublet lens group comprises:

[0007] The first cemented lens is a convex lens with positive refractive power;

[0008] The second cemented lens is a concave lens with negative refractive power;

[0009] The first cemented lens and the second cemented lens are bonded together without any gap;

[0010] The relationship between the curvature radii of the first cemented lens at the incident end and the exit end along the optical path is:

[0011] 0.05<|(R1+R1') / (R1-R1')|<0.1;

[0012] The relationship between the curvature radii of the second cemented lens at the incident end and the exit end along the optical path is:

[0013] 0.12<|(R2+R2') / (R2-R2')|<0.18;

[0014] Among them, R1 is the curvature radius corresponding to the incident end of the first cemented lens, R1' is the curvature radius corresponding to the exit end of the first cemented lens, R2 is the curvature radius corresponding to the incident end of the second cemented lens, and R2' is the curvature radius corresponding to the exit end of the second cemented lens.

[0015] Preferably, the thickness H of the compensating perspective plane mirror satisfies: 5<H<8mm;

[0016] The central thickness of the first cemented lens satisfies the relationship:

[0017] 0.6<H / h1<0.9;

[0018] The central thickness of the second cemented lens satisfies the relationship:

[0019] 2<H / h2<4;

[0020] Wherein, h1 is the center thickness of the first cemented lens, and h2 is the center thickness of the second cemented lens.

[0021] Preferably, the double cemented lens group is provided with a first lens group on the side away from the compensating perspective plane mirror along the optical path direction;

[0022] The first lens group comprises:

[0023] The first lens is a concave lens with negative refractive power;

[0024] The second lens is a convex lens with negative refractive power;

[0025] The relationship between the curvature radii of the first lens at the incident end and the exit end along the optical path is:

[0026] 0.5<|(R3+R3') / (R3-R3')|<1;

[0027] The relationship between the curvature radii of the second lens at the incident end and the exit end along the optical path is:

[0028] 0.05<|(R4+R4') / (R4-R4')|<0.1.

[0029] Preferably, the center thickness of the first lens satisfies the relationship:

[0030] 0.36<H / h3<0.57;

[0031] The central thickness of the second lens satisfies the relationship:

[0032] 0.9<H / h4<1.5.

[0033] Preferably, the first lens group is provided with a second lens group away from the doublet lens group along the optical path direction;

[0034] The second lens group comprises:

[0035] The third lens is a convex lens with positive refractive power;

[0036] The fourth lens is a convex lens with negative refractive power;

[0037] The relationship between the curvature radius of the third lens at the incident end and the exit end along the optical path is:

[0038] 1.2<|(R5+R5') / (R5-R5')|<1.6;

[0039] The relationship between the curvature radii of the fourth lens at the incident end and the exit end along the optical path is:

[0040] 6<|(R6+R6') / (R6-R6')|<9.

[0041] Preferably, the central thickness of the third lens satisfies the following relationship:

[0042] 0.3<H / h5<0.5;

[0043] The central thickness of the fourth lens satisfies the relationship:

[0044] 0.4<H / h6<0.7.

[0045] Preferably, the refractive index and Abbe number between the doublet lens group, the first lens group and the second lens group satisfy the following relationship:

[0046] 0.8<nd / ndi<1.2; i=1, 2, 3, 4, 5, 6;

[0047] Wherein, nd is the refractive index of the compensating perspective plane mirror;

[0048] nd1, nd2, nd3, nd4, nd5, and nd6 are respectively the first cemented lens, the second cemented lens, the first lens, the second lens, the third lens, and the fourth lens;

[0049] 0.8<vd / vdi<2.2; i=1, 2, 3, 4, 5, 6;

[0050] Wherein, vd is the Abbe number of the compensating perspective plane mirror;

[0051] vd1, vd2, vd3, vd4, vd5, and vd6 are respectively the first cemented lens, the second cemented lens, the first lens, the second lens, the third lens, and the fourth lens.

[0052] Preferably, the main lens group includes a first main lens and a second main lens;

[0053] The relationship between the curvature radius of the first main lens at the incident end and the exit end of the optical path is:

[0054] -0.3<Rz1 / Rz1'<-0.4;

[0055] The relationship between the curvature radius of the second main lens at the incident end and the exit end of the optical path is:

[0056] 0.6<Rz2 / Rz2'<0.7;

[0057] Among them, Rz1 is the curvature radius of the first main lens toward the incident end of the light path, Rz1' is the curvature radius of the first main lens toward the exit end of the light path; Rz2 is the curvature radius of the second main lens toward the incident end of the light path, Rz2' is the curvature radius of the second main lens toward the exit end of the light path.

[0058] The present application also provides an optical device, including a compensating imaging lens group under high dispersion.

[0059] Compared with the prior art, the advantages of the present invention are:

[0060] (1) This application optimizes the axial chromatic aberration of the original lens group and the clarity at the color edge by adding a lens group, making the color edge of the image sharper and clearer, thereby improving the clarity of the image, significantly improving the accuracy and consistency of color reproduction, making the overall image present a more realistic and natural color expression, and significantly improving the overall imaging effect.

[0061] (2) Compared with the lens group of the prior art, it helps to reduce image distortion and aberration caused by diffraction, such as coma and astigmatism, so that the lens group can provide clearer and more accurate images and reduce the correction work in image processing. The lens group with a high diffraction limit can better maintain the contrast of the image and provide clear images even under complex lighting conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0063] Figure 1 It is a structural schematic diagram of the main lens group of the prior art described in the present invention;

[0064] Figure 2 It is a point diagram of the main lens group of the prior art described in the present invention;

[0065] Figure 3 The MTF diagram of the complex light diffraction of the main lens group of the prior art described in the present invention;

[0066] Figure 4 This is a schematic structural diagram of a compensating imaging lens group under high dispersion according to the present invention;

[0067] Figure 5 It is a point diagram of a combined lens group of the main lens group and the doublet lens group of the present invention;

[0068] Figure 6 It is a point diagram of a combined lens group of the main lens group, the doublet lens group and the first lens group of the present invention;

[0069] Figure 7 A point diagram of a compensating imaging lens group under high dispersion according to the present invention;

[0070] Figure 8 This is a complex light diffraction MTF diagram of a compensating imaging lens group under high dispersion described in the present invention.

[0071] Description of reference numerals:

[0072] 1. Main lens group; 11. First main lens; 12. Second main lens; 2. Strengthening light reflector; 3. Compensating perspective plane mirror; 4. Double cemented lens group; 41. First cemented lens; 42. Second cemented lens; 5. First lens group; 51. First lens; 52. Second lens; 6. Second lens group; 53. Third lens; 54. Fourth lens. DETAILED DESCRIPTION

[0073] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0074] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0075] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0076] like Figure 4 As shown, a compensating imaging lens group and optical device under high dispersion eliminates the dispersion caused by light in the 650nm-1070nm band, including a main lens group 1, an enhanced light reflector 2, a compensating perspective plane mirror 3, and a double cemented lens group 4 distributed in sequence along the light path direction.

[0077] About the main lens group 1:

[0078] like Figure 1 As shown, the main lens group 1 includes a first main lens 11 and a second main lens 12; the first main lens 11 is a convex lens, and the second main lens 12 is a concave lens.

[0079] The relationship between the curvature radius of the first main lens 11 at the incident end and the exit end of the optical path is:

[0080] -0.3<Rz1 / Rz1'<-0.4;

[0081] The relationship between the curvature radius of the second main lens 12 at the incident end and the exit end of the optical path is:

[0082] 0.6<Rz2 / Rz2'<0.7;

[0083] Among them, Rz1 is the curvature radius of the first main lens 11 towards the incident end of the light path, Rz1' is the curvature radius of the first main lens 11 towards the exit end of the light path; Rz2 is the curvature radius of the second main lens 12 towards the incident end of the light path, Rz2' is the curvature radius of the second main lens 12 towards the exit end of the light path.

[0084] Specifically, in this embodiment, the first main lens 11 is made of C7980, the curvature radius of the first main lens 11 toward the incident end of the optical path is 219.277 mm, and the curvature radius toward the exit end of the optical path is -548.508 mm.

[0085] The material of the second main lens 12 is c7980, the radius of curvature of the first main lens 11 toward the incident end of the light path is -275.729 mm, and the radius of curvature toward the exit end of the light path is -456.306 mm.

[0086] The material of the enhanced light reflector 2 is SAPPHIRE, which has a low thermal absorption coefficient and produces little deformation at high temperatures; the enhanced light reflector 2 is a strong light reflector, and a coating is adhered to its surface. The coating has a reflectivity of 99.99% for light with a wavelength of 1070nm and a transmittance of more than 80% for light in the visible light band.

[0087] Among the main body lenses, the center thickness of the first main body lens 11 is 12 mm, and the center thickness of the second main body lens 12 is 12 mm.

[0088] The Seidel coefficient evaluation of the optical path with only the main lens group 1 is shown in Table 1:

[0089] Table 1. Seidel coefficients of the optical path of the main lens group

[0090]

[0091] About Compensating Perspective Plane Mirror 3

[0092] Mainly because the dispersion of the front optical path corresponding to the main lens group 1 in the X direction and the Y direction is greatly different, the compensation perspective plane mirror 3 is added to make the dispersion in the X direction and the Y direction tend to be consistent.

[0093] The thickness of the compensating perspective plane mirror 3 is 7 mm, and the range of its refractive index and Abbe number satisfies:

[0094] 1.4<nd<1.6, 58<vd<64.

[0095] In this embodiment, the compensating perspective plane mirror 3 is made of H-ZK3.

[0096] About doublet lens group 4:

[0097] like Figure 4 and Figure 5 As shown, the double cemented lens group 4 includes a first cemented lens 41 and a second cemented lens 42, wherein the first cemented lens 41 is a convex lens with positive refractive power, and the second cemented lens 42 is a concave lens with negative refractive power.

[0098] The relationship between the curvature radii of the first cemented lens 41 at the incident end and the exit end along the optical path is:

[0099] 0.05<|(R1+R1') / (R1-R1')|<0.1;

[0100] The curvature radii of the second cemented lens 42 along the incident end and the exit end of the optical path satisfy the relationship:

[0101] 0.12<|(R2+R2') / (R2-R2')|<0.18;

[0102] Among them, R1 is the curvature radius corresponding to the incident end of the first cemented lens 41, R1' is the curvature radius corresponding to the exit end of the first cemented lens 41, R2 is the curvature radius corresponding to the incident end of the second cemented lens 42, and R2' is the curvature radius corresponding to the exit end of the second cemented lens 42.

[0103] Preferably, the curvature radius R1 corresponding to the incident end of the first cemented lens 41 is 69.036 mm, the curvature radius R1' corresponding to the exit end of the first cemented lens 41 is -79.456 mm, the curvature radius R2 corresponding to the incident end of the second cemented lens 42 is -79.456 mm, and the curvature radius R2' corresponding to the exit end of the second cemented lens 42 is 57.364 mm.

[0104] The central thickness of the first cemented lens 41 satisfies the relationship:

[0105] 0.6<H / h1<0.9;

[0106] The central thickness of the second cemented lens 42 satisfies the relationship:

[0107] 2<H / h2<4;

[0108] Wherein, h1 is the center thickness of the first cemented lens 41 , and h2 is the center thickness of the second cemented lens 42 .

[0109] Preferably, the center thickness h1 of the first cemented lens 41 is 8.911 mm, and the center thickness h2 of the second cemented lens 42 is 2.17 mm.

[0110] The refractive index and Abbe number of the doublet lens group 4 satisfy the following relationship:

[0111] 0.8<nd / ndi<1.2; i=1, 2;

[0112] Wherein, nd is the refractive index of the compensating perspective plane mirror 3 , nd1 is the refractive index of the first cemented lens 41 , and nd2 is the refractive index of the second cemented lens 42 .

[0113] 0.8<vd / vdi<2.2; i=1, 2;

[0114] Wherein, vd is the Abbe number of the compensating perspective plane mirror 3 ; vd1 is the Abbe number of the first cemented lens 41 , and vd2 is the Abbe number of the second cemented lens 42 .

[0115] Since the refractive index and the Abbe number belong to material specifications and are determined by the specific lens material selection, in this embodiment, the material selected for the first cemented lens 41 is H-ZPK5, and the material selected for the second cemented lens 42 is H-LAK4L.

[0116] The double cemented lens group 4 is provided with a first lens group 5 in the direction away from the compensating perspective plane mirror 3 along the optical path direction;

[0117] About the first lens group 5:

[0118] like Figure 4 and Figure 6 As shown, the first lens group 5 includes a first lens 51 and a second lens 52, the first lens 51 is a concave lens with negative refractive power, and the second lens 52 is a convex lens with negative refractive power.

[0119] The relationship between the curvature radii of the first lens 51 at the incident end and the exit end along the optical path is:

[0120] 0.5<|(R3+R3') / (R3-R3')|<1;

[0121] The curvature radii of the second lens 52 along the incident end and the exit end of the optical path satisfy the relationship:

[0122] 0.05<|(R4+R4') / (R4-R4')|<0.1.

[0123] Among them, R3 is the curvature radius corresponding to the incident end of the first lens 51, R3' is the curvature radius corresponding to the exit end of the first lens 51, R4 is the curvature radius corresponding to the incident end of the second lens 52, and R4' is the curvature radius corresponding to the exit end of the second lens 52.

[0124] Preferably, the curvature radius R3 corresponding to the incident end of the first lens 51 is -190.165 mm, the curvature radius R3' corresponding to the exit end of the first lens 51 is 1.2195 mm, the curvature radius R4 corresponding to the incident end of the second lens 52 is 111.674 mm, and the curvature radius R4' corresponding to the exit end of the second lens 52 is -91.45 mm.

[0125] The central thickness of the first lens 51 satisfies the relationship:

[0126] 0.36<H / h3<0.57;

[0127] The central thickness of the second lens 52 satisfies the relationship:

[0128] 0.9<H / h4<1.5.

[0129] Wherein, h3 is the center thickness of the first lens 51 , and h4 is the center thickness of the second lens 52 .

[0130] Preferably, the center thickness h3 of the first lens 51 is 14 mm, and the center thickness h4 of the second lens 52 is 5.453 mm.

[0131] The first lens group 5 is provided with a second lens group 6 in a direction away from the compensating perspective plane mirror 3 along the optical path direction;

[0132] About the second lens group 6:

[0133] like Figures 4 to 8 As shown, the second lens group 6 includes a third lens 53 and a fourth lens 54, wherein the third lens 53 is a convex lens with positive refractive power, and the fourth lens 54 is a convex lens with negative refractive power.

[0134] The relationship between the curvature radii of the third lens 53 at the incident end and the exit end along the optical path is:

[0135] 1.2<|(R5+R5') / (R5-R5')|<1.6;

[0136] The relationship between the curvature radii of the fourth lens 54 at the incident end and the exit end along the optical path is:

[0137] 6<|(R6+R6') / (R6-R6')|<9.

[0138] R5 is the curvature radius corresponding to the incident end of the third lens 53, R5' is the curvature radius corresponding to the exit end of the third lens 53, R6 is the curvature radius corresponding to the incident end of the fourth lens 54, and R6' is the curvature radius corresponding to the exit end of the fourth lens 54.

[0139] Preferably, the curvature radius R5 corresponding to the incident end of the third lens 53 is 47.939 mm, the curvature radius R5' corresponding to the exit end of the third lens 53 is 267.403 mm, the curvature radius R6 corresponding to the incident end of the fourth lens 54 is 27.288 mm, and the curvature radius R6' corresponding to the exit end of the fourth lens 54 is 20.496 mm.

[0140] The central thickness of the third lens 53 satisfies the relationship:

[0141] 0.3<H / h5<0.5;

[0142] The central thickness of the fourth lens 54 satisfies the relationship:

[0143] 0.4<H / h6<0.7.

[0144] Wherein, h5 is the center thickness of the third lens 53 , and h6 is the center thickness of the fourth lens 54 .

[0145] Preferably, the center thickness h5 of the third lens 53 is 15 mm, and the center thickness h6 of the fourth lens 54 is 11.876 mm.

[0146] The refractive index and Abbe number of the first lens group 5 and the second lens group 6 satisfy the above relationship:

[0147] 0.8<nd / ndi<1.2; i=3, 4, 5, 6;

[0148] Among them, nd3 is the refractive index of the first lens 51 , nd4 is the refractive index of the second lens 52 , nd5 is the refractive index of the third lens 53 , and nd6 is the refractive index of the fourth lens 54 .

[0149] 0.8<vd / vdi<2.2; i=3, 4, 5, 6;

[0150] Among them, vd3 is the Abbe number of the first lens 51 , vd4 is the Abbe number of the second lens 52 , vd5 is the Abbe number of the third lens 53 , and vd6 is the Abbe number of the fourth lens 54 .

[0151] Since the refractive index and the Abbe number are material specifications and are determined by the specific lens material selection, in this embodiment, the first lens 51 and the third lens 53 are made of H-ZLAF76, and the second lens 52 and the fourth lens 54 are made of H-ZPK7.

[0152] like Figure 8 As shown in the complex light diffraction MTF diagram of the present application, the diffraction limit of the present application is 0.7. Compared with the lens group in the prior art, it helps to reduce image distortion and aberrations caused by diffraction, such as coma, astigmatism, etc., so that the lens group can provide clearer and more accurate images and reduce the correction work in image processing. The lens group with a high diffraction limit can better maintain the contrast of the image and provide clear images even under complex lighting conditions.

[0153] A is the Seidel coefficient evaluation of the optical path of the main lens group 1, and B is the Seidel coefficient evaluation of the main lens group 1 with the addition of the compensating perspective plane mirror 3, the double cemented lens group 4, the first lens group 5 and the second lens group 6. The following is a comparison of the Seidel coefficient evaluations of the two as shown in Table 2:

[0154] Table 2. Seidel coefficient evaluation of this application

[0155]

[0156] After the optimization and adjustment, although the performance of spherical aberration and vertical axis chromatic aberration was sacrificed to a certain extent, the optimization of axial chromatic aberration was extremely significant. Specifically, the spherical aberration increased from 0.002502 before the improvement to 0.009826. Although this change may have brought about a certain loss of image quality, especially in terms of clarity and contrast near the focal length, such a sacrifice is in exchange for a more important improvement in image quality. The vertical axis chromatic aberration also experienced a slight weakening, from 0.000137 before the improvement to 0.000560. Considering the improvement of overall performance, this sacrifice is acceptable.

[0157] The optimization effect of axial chromatic aberration is significant, and this significant progress is reflected in the great improvement in the value: from -0.049238 before the improvement to -0.000301. The clarity at the color edge is optimized, making the color edge of the image sharper and clearer, thereby improving the clarity of the image, significantly improving the accuracy and consistency of color reproduction, making the overall image present a more realistic and natural color performance, and significantly improving the overall imaging effect.

[0158] In addition, parameters such as coma, astigmatism, field curvature and distortion have also been adjusted to varying degrees. Coma has been reduced from 0.002413 to 0.000530, showing the optimization of the system in eliminating light deflection; astigmatism has changed from 0.000748 to -0.000253. Although the sign has changed, the absolute value has decreased, indicating that astigmatism has been effectively controlled; field curvature has increased from 0.000547 to 0.000549, with a slight change and little effect on the overall imaging quality; distortion has increased from -0.000011 to 0.006090. Although it has increased, distortion can usually be corrected through post-processing, so it will not cause much trouble in practical applications.

[0159] Based on the above, the present application also provides an optical device, including the above-mentioned high-dispersion compensating imaging lens group. The present application can be installed in a high-energy laser system, coaxial with the emission optical path, and compared with the camera's external dimming axis, the coaxial optical path greatly reduces the workload and failure rate.

[0160] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A compensating imaging lens assembly under high dispersion, characterized in that: It consists of a main lens group, an enhanced light reflector, a compensating perspective plane mirror, and a double cemented lens group which are sequentially distributed along the optical path direction; The doublet lens group comprises: The first cemented lens is a convex lens with positive refractive power; The second cemented lens is a concave lens with negative refractive power; The first cemented lens and the second cemented lens are bonded together without any gap; The relationship between the curvature radii of the first cemented lens at the incident end and the exit end along the optical path is: 0.05<|(R1+R1') / (R1-R1')|<0.1; The relationship between the curvature radii of the second cemented lens at the incident end and the exit end along the optical path is: 0.12<|(R2+R2') / (R2-R2')|<0.18; Wherein, R1 is the curvature radius corresponding to the incident end of the first cemented lens, R1' is the curvature radius corresponding to the exit end of the first cemented lens, R2 is the curvature radius corresponding to the incident end of the second cemented lens, and R2' is the curvature radius corresponding to the exit end of the second cemented lens; The double cemented lens group is provided with a first lens group on the side away from the compensating perspective plane mirror along the optical path direction; The first lens group comprises: The first lens is a concave lens with negative refractive power; The second lens is a convex lens with negative refractive power; The relationship between the curvature radii of the first lens at the incident end and the exit end along the optical path is: 0.5<|(R3+R3') / (R3-R3')|<1; The relationship between the curvature radii of the second lens at the incident end and the exit end along the optical path is: 0.05<|(R4+R4') / (R4-R4')|<0.1; The first lens group is provided with a second lens group away from the doublet lens group along the optical path direction; The second lens group comprises: The third lens is a convex lens with positive refractive power; The fourth lens is a convex lens with negative refractive power; The main lens group includes a first main lens and a second main lens; A first main lens, a convex lens with positive refractive power; The second main lens is a concave lens with negative refractive power.

2. The high dispersion compensating imaging lens assembly according to claim 1, characterized in that: The thickness H of the compensating perspective plane mirror satisfies: 5<H<8mm; The central thickness of the first cemented lens satisfies the relationship: 0.6<H / h1<0.9; The central thickness of the second cemented lens satisfies the relationship: 2<H / h2<4; Wherein, h1 is the center thickness of the first cemented lens, and h2 is the center thickness of the second cemented lens.

3. The high dispersion compensating imaging lens assembly according to claim 2, characterized in that: The central thickness of the first lens satisfies the relationship: 0.36<H / h3<0.57; The central thickness of the second lens satisfies the relationship: 0.9<H / h4<1.

5.

4. The high dispersion compensating imaging lens assembly according to claim 1, characterized in that: The relationship between the curvature radii of the third lens at the incident end and the exit end along the optical path is: 1.2<|(R5+R5') / (R5-R5')|<1.6; The relationship between the curvature radii of the fourth lens at the incident end and the exit end along the optical path is: 6<|(R6+R6') / (R6-R6')|<9.

5. The high dispersion compensating imaging lens assembly according to claim 2, characterized in that: The central thickness of the third lens satisfies the relationship: 0.3<H / h5<0.5; The central thickness of the fourth lens satisfies the relationship: 0.4<H / h6<0.

7.

6. The high dispersion compensating imaging lens assembly according to claim 5, characterized in that: The refractive index and Abbe number of the doublet lens group, the first lens group and the second lens group satisfy the following relationship: 0.8<nd / ndi<1.2; i=1, 2, 3, 4, 5, 6; Wherein, nd is the refractive index of the compensating perspective plane mirror; nd1, nd2, nd3, nd4, nd5, and nd6 are respectively the first cemented lens, the second cemented lens, the first lens, the second lens, the third lens, and the fourth lens; 0.8<vd / vdi<2.2; i=1, 2, 3, 4, 5, 6; Wherein, vd is the Abbe number of the compensating perspective plane mirror; vd1, vd2, vd3, vd4, vd5, and vd6 are respectively the first cemented lens, the second cemented lens, the first lens, the second lens, the third lens, and the fourth lens.

7. The high dispersion compensating imaging lens assembly according to claim 1, characterized in that: The relationship between the curvature radius of the first main lens at the incident end and the exit end of the optical path is: -0.3<Rz1 / Rz1'<-0.4; The relationship between the curvature radius of the second main lens at the incident end and the exit end of the optical path is: 0.6<Rz2 / Rz2'<0.7; Among them, Rz1 is the curvature radius of the first main lens toward the incident end of the light path, Rz1' is the curvature radius of the first main lens toward the exit end of the light path; Rz2 is the curvature radius of the second main lens toward the incident end of the light path, Rz2' is the curvature radius of the second main lens toward the exit end of the light path.

8. An optical device, characterized in that: A compensating imaging lens group under high dispersion comprising the one described in any one of claims 1-7.

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