Visible and near infrared spectrum imaging lens

Abstract

The present invention relates to the field of optical lenses, and provides a visible near-infrared spectrum imaging lens for visible near-infrared spectrum imaging. The lens includes, from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and an integrated filter; the side of the fourth lens close to the image plane is an aspherical surface, the side of the sixth lens close to the image plane is an aspherical surface, the first lens, the second lens, the third lens, the fifth lens, the seventh lens, and the eighth lens are spherical lenses; the first lens, the fourth lens, the fifth lens, the sixth lens, and the eighth lens are positive lenses, and the second lens, the third lens, and the seventh lens are negative lenses. The present invention is used to solve the defects of the imaging lens for visible near-infrared spectrum in the prior art, such as complex structure, poor imaging quality, and small field of view. The scheme of the present invention can form an image-side telecentric optical path by setting the aperture in the center of the optical path to control the light beam exit angle, thereby improving the quality of spectral imaging.

Description

Technical Field

[0001] The invention relates to the technical field of optical lenses, and in particular to a visible near-infrared spectrum imaging lens. Background Art

[0002] With the development of infrared detectors, the spectral response range of detectors has been able to cover from visible light to short-wave light.

[0003] At present, imaging of long-wave and short-wave infrared spectra is relatively mature, but spectral imaging of visible and near-infrared light still has problems such as complex structure, poor imaging quality, small field of view, and large distortion, which cannot meet the needs of actual use. Summary of the invention

[0004] The present invention provides a visible near-infrared spectrum imaging lens, which is used to solve the defects of the imaging lens for visible near-infrared spectrum in the prior art, such as complex structure and poor imaging quality. The scheme of the present invention can form an image-side telecentric optical path by setting an aperture at the center of the optical path structure, thereby improving the quality of spectral imaging.

[0005] The present invention provides a visible near-infrared spectrum imaging lens, which is used for visible near-infrared spectrum imaging, and includes, from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a filter;

[0006] The side of the fourth lens close to the image plane is aspherical, the side of the sixth lens close to the image plane is aspherical, and the first lens, the second lens, the third lens, the fifth lens, the seventh lens and the eighth lens are spherical lenses;

[0007] The first lens, the fourth lens, the fifth lens, the sixth lens and the eighth lens are positive lenses, and the second lens, the third lens and the seventh lens are negative lenses.

[0008] According to the visible near-infrared spectrum imaging lens provided by the present invention, the curvature radius R1 of the first lens on the side close to the object plane satisfies 30 mm≤R1≤40 mm;

[0009] The curvature radius R2 of the first lens on the side close to the image plane satisfies 30 mm ≤ R2 ≤ 40 mm;

[0010] The curvature radius R3 of the second lens on the side close to the object plane satisfies 15 mm ≤ R3 ≤ 20 mm;

[0011] The curvature radius R4 of the second lens on the side close to the image plane satisfies 10 mm ≤ R4 ≤ 15 mm;

[0012] A curvature radius R5 of the third lens on a side close to the object plane satisfies 110 mm ≤ R5 ≤ 120 mm;

[0013] The curvature radius R6 of the third lens on the side close to the image plane satisfies 5 mm ≤ R6 ≤ 10 mm;

[0014] A curvature radius R7 of a side of the fourth lens close to the object plane satisfies 25 mm ≤ R7 ≤ 30 mm;

[0015] A curvature radius R8 of the fourth lens element on a side close to the image plane satisfies 45 mm≤R8≤50 mm;

[0016] A curvature radius R9 of a side of the fifth lens close to the object plane satisfies 150 mm ≤ R9 ≤ 160 mm;

[0017] A curvature radius R10 of the fifth lens element on the image plane side satisfies -15 mm ≤ R10 ≤ -10 mm;

[0018] A curvature radius R11 of a side of the sixth lens close to the object plane satisfies 15 mm≤R11≤20 mm;

[0019] A radius of curvature R12 of the sixth lens element on the image plane side satisfies -15 mm ≤ R12 ≤ -10 mm;

[0020] A radius of curvature R13 of a side of the seventh lens close to the object plane satisfies -20 mm ≤ R13 ≤ -15 mm;

[0021] A curvature radius R14 of the seventh lens element on a side close to the image plane satisfies 15 mm≤R14≤20 mm;

[0022] A radius of curvature R15 of a side of the eighth lens close to the object plane satisfies 30 mm≤R15≤40 mm;

[0023] A radius of curvature R16 of the eighth lens on the image plane side satisfies -130 mm ≤ R16 ≤ -110 mm.

[0024] According to the visible near-infrared spectrum imaging lens provided by the present invention, the center thickness d1 of the first lens satisfies 5 mm≤d1≤10 mm;

[0025] The center thickness d2 of the second lens satisfies 5 mm ≤ d2 ≤ 10 mm;

[0026] The central thickness d3 of the third lens satisfies 5 mm ≤ d3 ≤ 8 mm;

[0027] A central thickness d4 of the fourth lens satisfies 5 mm ≤ d4 ≤ 10 mm;

[0028] A central thickness d5 of the fifth lens satisfies 5 mm ≤ d5 ≤ 6 mm;

[0029] A central thickness d6 of the sixth lens satisfies 5 mm ≤ d6 ≤ 10 mm;

[0030] A central thickness d7 of the seventh lens satisfies 4 mm≤d7≤5 mm;

[0031] A central thickness d8 of the eighth lens satisfies 5 mm ≤ d8 ≤ 10 mm;

[0032] The center thickness d9 of the integrated filter satisfies 1 mm ≤ d8 ≤ 5 mm.

[0033] According to the visible near-infrared spectrum imaging lens provided by the present invention, the distance p1 between the side of the first lens close to the image plane and the side of the second lens close to the object plane satisfies 20 mm≤p1≤25 mm;

[0034] A distance p2 between the image plane side of the second lens and the object plane side of the third lens satisfies 5 mm ≤ p2 ≤ 10 mm;

[0035] A distance p3 between the image plane side of the third lens and the object plane side of the fourth lens satisfies 2 mm ≤ p3 ≤ 3 mm;

[0036] A distance p4 between a side of the fourth lens element close to the image plane and the aperture satisfies 1 mm ≤ p4 ≤ 2 mm;

[0037] The distance p5 between the aperture and the fifth lens close to the object plane is 1 mm;

[0038] A distance p6 between a side of the fifth lens element close to the image plane and a side of the sixth lens element close to the object plane satisfies 2 mm ≤ p6 ≤ 3 mm;

[0039] A distance p7 between a side of the sixth lens closer to the image plane and a side of the seventh lens closer to the object plane satisfies 1 mm≤p7≤2 mm;

[0040] A distance p8 between a side of the seventh lens element close to the image plane and a side of the eighth lens element close to the object plane satisfies 10 mm ≤ p8 ≤ 15 mm;

[0041] A distance p9 between a side of the eighth lens close to the image plane and a side of the integrated filter close to the object plane satisfies 10 mm ≤ p9 ≤ 11 mm;

[0042] The distance p10 between the side of the integrated filter close to the image plane and the image plane satisfies 0 mm ≤ p9 ≤ 3 mm.

[0043] According to the visible near-infrared spectrum imaging lens provided by the present invention, the focal length f1 of the first lens satisfies 350 mm≤f1≤400 mm;

[0044] The focal length f2 of the second lens satisfies -110 mm ≤ f2 ≤ -100 mm;

[0045] The focal length f3 of the third lens satisfies -30 mm ≤ f3 ≤ -10 mm;

[0046] The focal length f4 of the fourth lens element satisfies 60 mm ≤ f4 ≤ 70 mm;

[0047] The focal length f5 of the fifth lens satisfies 20 mm ≤ f5 ≤ 30 mm;

[0048] The focal length f6 of the sixth lens satisfies 15 mm≤f6≤20 mm;

[0049] The focal length f7 of the seventh lens satisfies -15 mm ≤ f7 ≤ -10 mm;

[0050] The focal length f8 of the eighth lens satisfies 30 mm≤f8≤35 mm.

[0051] According to the visible-near-infrared spectrum imaging lens provided by the present invention, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all made of optical glass.

[0052] According to the visible near-infrared spectrum imaging lens provided by the present invention, the cone coefficient k1 of the fourth lens close to the image plane is 8.78;

[0053] The cone coefficient k2 of the sixth lens on the image plane side is -1.68.

[0054] The present invention also provides a visible near-infrared spectrum telescope, comprising any one of the above-mentioned visible near-infrared spectrum imaging lenses.

[0055] The visible near-infrared spectrum telescope provided by the present invention is applied to visible near-infrared spectrum imaging in the 0.4 μm to 1.1 μm band.

[0056] According to the visible and near-infrared spectrum telescope provided by the present invention, the optical path of the telescope is an image-side telecentric optical path.

[0057] In the visible near-infrared spectrum imaging lens provided by the present invention, by setting the position of the aperture at the middle position of the optical path, the light incident from the object plane first passes through the lens and then through the aperture, and then is processed by the lens, which actually forms an image-side telecentric optical path. In this way, the light emitted from the image plane can remain stable, which can improve the quality of spectral imaging and the resolution of imaging. In addition, through the combination relationship of the positive lens and the negative lens, the incident light path is converged and diverged multiple times, which can make the lens have a better convergence or divergence effect on the light beam, which can better improve the optical performance of the visible near-infrared spectrum imaging lens, effectively reduce the aberration of imaging, and further improve the quality of imaging. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 Schematic diagram of the optical path of the visible-near infrared spectrum imaging lens provided by an embodiment of the present invention;

[0060] Figure 2 is one of the schematic diagrams of the modulation transfer function of the visible near-infrared spectrum imaging lens provided by an embodiment of the present invention;

[0061] Figure 3 Schematic diagram 2 of the modulation transfer function of the visible near-infrared spectrum imaging lens provided by an embodiment of the present invention;

[0062] Figure 4 is a schematic diagram of a point diagram of a visible near-infrared spectrum imaging lens provided by an embodiment of the present invention;

[0063] Figure 5 Schematic diagram of field curvature of a visible near-infrared spectrum imaging lens provided by an embodiment of the present invention;

[0064] Figure 6 Schematic diagram of the distortion of the visible-near-infrared spectrum imaging lens provided by an embodiment of the present invention.

[0065] in:

[0066] 1-first lens; 2-second lens; 3-third lens; 4-fourth lens; 5-aperture;

[0067] 6-fifth lens; 7-sixth lens; 8-seventh lens; 9-eighth lens; 10-integrated filter. DETAILED DESCRIPTION

[0068] 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 drawings of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0069] Figure 1 Schematic diagram of the optical path of the visible-near infrared spectrum imaging lens provided by an embodiment of the present invention.

[0070] like Figure 1As shown, this embodiment provides a visible near-infrared spectrum imaging lens, including:

[0071] Used for visible near-infrared spectrum imaging, the system includes, from the object plane to the image plane, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, an aperture 5, a fifth lens 6, a sixth lens 7, a seventh lens 8, an eighth lens 9 and an integrated filter 10;

[0072] The side of the fourth lens close to the image plane is aspherical, the side of the sixth lens close to the image plane is aspherical, and the first lens, the second lens, the third lens, the fifth lens, the seventh lens and the eighth lens are spherical lenses;

[0073] The first lens, the fourth lens, the fifth lens, the sixth lens and the eighth lens are positive lenses, and the second lens, the third lens and the seventh lens are negative lenses.

[0074] The main light rays of the image-side telecentric optical path are parallel to the optical axis, and the convergence center of the main light rays is located at infinity on the image side. The characteristic of the image-side telecentric optical path is that the magnification is independent of the image distance, and the measurement error introduced by inaccurate focusing on the image side can be eliminated. In the scheme of this embodiment, the aperture is set in the middle position of the optical path, and four lenses are respectively set on the side of the aperture close to the object plane and the side close to the image plane to control the light emission angle to the image plane. In this way, an image-side telecentric optical path is actually formed, which can make the light emitted from the image plane parallel, thereby improving the quality of spectral imaging.

[0075] In an exemplary embodiment, the radius of curvature R1 of the first lens on the side close to the object plane satisfies 30 mm≤R1≤40 mm, preferably 38.08 mm;

[0076] The curvature radius R2 of the first lens on the side close to the image plane satisfies 30 mm≤R2≤40 mm, preferably 39.60 mm;

[0077] The curvature radius R3 of the second lens on the side close to the object plane satisfies 15 mm≤R3≤20 mm, preferably 19.22 mm;

[0078] The curvature radius R4 of the second lens on the side close to the image plane satisfies 10 mm≤R4≤15 mm, preferably 12.64 mm;

[0079] The curvature radius R5 of the third lens on the side close to the object plane satisfies 110 mm≤R5≤120 mm, preferably 116.91 mm;

[0080] The curvature radius R6 of the third lens on the side close to the image plane satisfies 5 mm≤R6≤10 mm, preferably 9 mm;

[0081] The curvature radius R7 of the fourth lens element on the side close to the object plane satisfies 25 mm≤R7≤30 mm, and is preferably 28.33 mm;

[0082] The curvature radius R8 of the fourth lens element on the side close to the image plane satisfies 45 mm≤R8≤50 mm, and is preferably 47.56 mm;

[0083] The curvature radius R9 of the fifth lens element on the side close to the object plane satisfies 150 mm≤R9≤160 mm, and is preferably 159.72 mm;

[0084] The curvature radius R10 of the fifth lens element on the image plane side satisfies -15 mm ≤ R10 ≤ -10 mm, preferably -11.80 mm;

[0085] The curvature radius R11 of the sixth lens element on the side close to the object plane satisfies 15 mm≤R11≤20 mm, and is preferably 18.11 mm;

[0086] The curvature radius R12 of the sixth lens element on the side close to the image plane satisfies -15 mm ≤ R12 ≤ -10 mm, and is preferably -13.59 mm;

[0087] The curvature radius R13 of the seventh lens element on the side close to the object plane satisfies -20 mm ≤ R13 ≤ -15 mm, and is preferably -17.21 mm;

[0088] The curvature radius R14 of the seventh lens element on the image plane side satisfies 15 mm≤R14≤20 mm, and is preferably 17.93 mm;

[0089] The curvature radius R15 of the eighth lens element on the side close to the object plane satisfies 30 mm≤R15≤40 mm, and is preferably 35.39 mm;

[0090] The curvature radius R16 of the eighth lens on the image plane side satisfies -130 mm ≤ R16 ≤ -110 mm, and is preferably -119.79 mm.

[0091] The radius of curvature is a quantity that describes the degree of curvature change of a curve at a certain point on the curve. In this embodiment, the edge thickness of the lens can be controlled by limiting the radius of curvature of the lens. On the one hand, the relationship between the control effect of the lens on the light passing through the edge and the energy loss of the light can be balanced. On the other hand, the radius of curvature can also control the aberration of the lens. The obtained infrared lens can have a larger image field with lower distortion, thereby improving the quality of imaging.

[0092] In an exemplary embodiment, the center thickness d1 of the first lens satisfies 5 mm≤d1≤10 mm, preferably 8 mm;

[0093] The center thickness d2 of the second lens satisfies 5 mm≤d2≤10 mm, preferably 8 mm;

[0094] The central thickness d3 of the third lens satisfies 5 mm≤d3≤8 mm, preferably 6.58 mm;

[0095] The central thickness d4 of the fourth lens satisfies 5 mm≤d4≤10 mm, preferably 8 mm;

[0096] The central thickness d5 of the fifth lens satisfies 5 mm≤d5≤6 mm, preferably 5.78 mm;

[0097] The central thickness d6 of the sixth lens satisfies 5 mm≤d6≤10 mm, preferably 8 mm;

[0098] The center thickness d7 of the seventh lens satisfies 4 mm≤d7≤5 mm, preferably 4.79 mm;

[0099] The central thickness d8 of the eighth lens satisfies 5 mm≤d8≤10 mm, preferably 7.44 mm;

[0100] The center thickness d9 of the integrated filter satisfies 1 mm≤d8≤5 mm, and is preferably 2 mm.

[0101] In practical applications, the center thickness of the lens refers to the thickness of the central part of the lens, and what is measured is the center thickness of the highest point or the lowest point on the two surfaces of the lens. In practical applications, by controlling the center thickness of the eight lenses, the optical path length of the light passing through the lens can be accurately controlled. The optical path length here can affect the convergence or divergence effect of the lens on the light on the one hand, and on the other hand, it will also affect the energy loss of the light when it propagates in the lens. Therefore, in this embodiment, by controlling the center thickness of the eight lenses within a certain range, the relationship between the control effect of the lens on the light and the energy loss of the light can be balanced, so that the highest possible control effect can be achieved with the least possible energy loss.

[0102] In an exemplary embodiment, a distance p1 between a side of the first lens close to the image plane and a side of the second lens close to the object plane satisfies 20 mm≤p1≤25 mm, preferably 21.25 mm;

[0103] The distance p2 between the side of the second lens close to the image plane and the side of the third lens close to the object plane satisfies 5 mm≤p2≤10 mm, preferably 9 mm;

[0104] A distance p3 between the image side of the third lens and the object side of the fourth lens satisfies 2 mm ≤ p3 ≤ 3 mm, preferably 2.68 mm;

[0105] A distance p4 between the fourth lens element and the aperture on the side close to the image plane satisfies 1 mm ≤ p4 ≤ 2 mm, preferably 1.92 mm;

[0106] The distance p5 between the aperture and the fifth lens close to the object plane is 1 mm;

[0107] A distance p6 between the side of the fifth lens closer to the image plane and the side of the sixth lens closer to the object plane satisfies 2 mm≤p6≤3 mm, preferably 2.22 mm;

[0108] A distance p7 between a side of the sixth lens close to the image plane and a side of the seventh lens close to the object plane satisfies 1 mm≤p7≤2 mm, preferably 1 mm;

[0109] A distance p8 between the image plane side of the seventh lens and the object plane side of the eighth lens satisfies 10 mm≤p8≤15 mm, preferably 13.69 mm;

[0110] A distance p9 between the side of the eighth lens close to the image plane and the side of the integrated filter close to the object plane satisfies 10 mm≤p9≤11 mm, preferably 10.36 mm;

[0111] The distance p10 between the side of the integrated filter close to the image plane and the image plane satisfies 0 mm ≤ p9 ≤ 3 mm, and is preferably 0.5 mm.

[0112] The distance in this embodiment refers to the vertical distance. In the scheme of this embodiment, by controlling the vertical distance between the lenses, it can ensure that the lenses can maximize the convergence or divergence effect and avoid problems such as excessive convergence, excessive divergence, insufficient convergence or insufficient divergence.

[0113] In an exemplary embodiment, the focal length f1 of the first lens satisfies 350 mm≤f1≤400 mm, preferably 390.06 mm;

[0114] The focal length f2 of the second lens satisfies -110 mm ≤ f2 ≤ -100 mm, preferably -108.38 mm;

[0115] The focal length f3 of the third lens satisfies -30 mm ≤ f3 ≤ -10 mm, preferably -19.61 mm;

[0116] The focal length f4 of the fourth lens element satisfies 60 mm≤f4≤70 mm, and is preferably 66.73 mm;

[0117] The focal length f5 of the fifth lens element satisfies 20 mm≤f5≤30 mm, and is preferably 25.60 mm;

[0118] The focal length f6 of the sixth lens element satisfies 15 mm≤f6≤20 mm, and is preferably 17.25 mm;

[0119] The focal length f7 of the seventh lens element satisfies -15 mm ≤ f7 ≤ -10 mm, preferably -13.04 mm;

[0120] The focal length f8 of the eighth lens satisfies 30 mm≤f8≤35 mm, and is preferably 33.79 mm.

[0121] In an exemplary embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all made of optical glass.

[0122] Specifically, the material of the first lens is H-LAF10LA; the material of the second lens is D-LAK70-25; the material of the third lens is D-K9GT-25; the material of the fourth lens is H-ZLAF78B; the material of the fifth lens is H-FK95N; the material of the sixth lens is D-FK61-25; the material of the seventh lens is H-TF5; the material of the eighth lens is H-ZLAF76A, and the material of the integrated filter is fused quartz.

[0123] In an exemplary embodiment, the cone coefficient k1 of the fourth lens on the side close to the image plane is 8.78;

[0124] The cone coefficient k2 of the sixth lens on the image plane side is -1.68.

[0125] In practical applications, the side of the fourth lens close to the image plane is an aspherical surface, and the side of the sixth lens close to the image plane is also an aspherical surface. The aspherical surface shapes of the side of the fourth lens close to the image plane and the side of the sixth lens close to the image plane meet the following formula:

[0126]

[0127] Where Z is the vector height, c is the curvature, r is the radial distance from a point on the lens to the optical axis, k is the cone coefficient, and a4, a6 and a8 are all aspherical coefficients.

[0128] On this basis, the cone coefficient k1 of the fourth lens on the side close to the image plane is 8.78, and the cone coefficient k2 of the sixth lens on the side close to the image plane is -1.68.

[0129] Table 1 below illustrates parameters such as the radius of curvature, thickness, and material of each optical device in the visible-near infrared spectrum imaging lens provided by the solution of the present application.

[0130]

[0131]

[0132] Among them, surface 1 and surface 2 in the above table may represent the object plane side and the image plane side of the first lens, surface 3 and surface 4 may represent the object plane side and the image plane side of the second lens, surface 5 and surface 6 may represent the object plane side and the image plane side of the third lens, surface 7 and surface 8 may represent the object plane side and the image plane side of the fourth lens, surface 10 and surface 11 may represent the object plane side and the image plane side of the fifth lens, surface 12 and surface 13 may represent the object plane side and the image plane side of the sixth lens, surface 14 and surface 15 may represent the object plane side and the image plane side of the seventh lens, surface 16 and surface 17 may represent the object plane side and the image plane side of the eighth lens, and surface 18 and surface 19 may represent the object plane side and the image plane side of the third filter lens.

[0133] Furthermore, the thickness of surface 1 can represent the central thickness of the first lens, and the thickness of surface 2 can represent the vertical distance between the image side of the first lens and the object side of the second lens, and the same applies to surfaces 3-19.

[0134] The present invention also provides a visible near-infrared spectrum telescope, comprising any one of the above-mentioned visible near-infrared spectrum imaging lenses.

[0135] The image field size of the visible near-infrared spectrum telescope is 27.84mm, which can be matched with a 2048×1024 detector and is used for visible near-infrared spectrum imaging in the 0.4μm to 1.1μm band. The focal length is 33, the F number is 4, the full field of view is 48 degrees, and the image side field of view angle is less than 0.5 degrees.

[0136] The optical path of the visible near-infrared spectrum telescope is an image-side telecentric optical path.

[0137] Figure 2 This is one of the schematic diagrams of the modulation transfer function of the visible near-infrared spectrum imaging lens provided by an embodiment of the present invention.

[0138] Figure 3 This is the second schematic diagram of the modulation transfer function of the visible near-infrared spectrum imaging lens provided by an embodiment of the present invention.

[0139] Figure 4 It is a schematic diagram of a point diagram of a visible near-infrared spectrum imaging lens provided by an embodiment of the present invention.

[0140] Figure 5 Schematic diagram of field curvature of a visible near-infrared spectrum imaging lens provided by an embodiment of the present invention.

[0141] Figure 6 Schematic diagram of the distortion of the visible-near-infrared spectrum imaging lens provided by an embodiment of the present invention.

[0142] in Figure 2 This is a schematic diagram of the modulation transfer function when the lens works at the Nyquist frequency of 45.45lp / mm. Figure 3 This is a schematic diagram of the modulation transfer function when the lens operates at the Nyquist frequency of 100lp / mm.

[0143] like Figure 2 As shown, when the lens uses a 2048×1024 detector and the pixel center distance is 11μm, at the Nyquist frequency of 45.45lp / mm, the full-field MTF is greater than 0.66, and the optical transfer function is close to the diffraction limit.

[0144] like Figure 3 As shown, the full-field MTF is greater than 0.4@100lp / mm, which can be applied to smaller pixel detectors.

[0145] like Figure 4 As shown, the system diffuse spot radius is smaller than one pixel, less than 7.00 μm.

[0146] like Figure 5 and Figure 6 As shown, the distortion of spectral imaging is less than 2%, and the imaging quality is high.

[0147] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0148] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Visible and near infrared spectrum imaging lens, characterized in that: Used for visible and near-infrared spectrum imaging, the system includes, from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and an integrated filter; The side of the fourth lens close to the image plane is aspherical, the side of the sixth lens close to the image plane is aspherical, and the first lens, the second lens, the third lens, the fifth lens, the seventh lens and the eighth lens are spherical lenses; The first lens, the fourth lens, the fifth lens, the sixth lens and the eighth lens are positive lenses, and the second lens, the third lens and the seventh lens are negative lenses; The radius of curvature of the first lens on the side close to the object plane R 1 Satisfaction ; The radius of curvature of the first lens on the side close to the image plane R 2 Satisfaction ; The radius of curvature of the second lens on the side close to the object plane R 3. Satisfaction ; The radius of curvature of the second lens on the side close to the image plane R 4 Satisfaction ; The radius of curvature of the third lens on the side close to the object plane R 5 Satisfaction ; The radius of curvature of the third lens on the side close to the image plane R 6 Satisfaction ; The radius of curvature of the fourth lens on the side close to the object plane R 7 Satisfaction ; The curvature radius of the fourth lens on the side close to the image plane R 8 Satisfaction ; The radius of curvature of the fifth lens on the side close to the object plane R 9 Satisfaction ; The curvature radius of the fifth lens on the side close to the image plane R 10 Satisfaction ; The radius of curvature of the sixth lens on the side close to the object plane R 11 Satisfaction ; The curvature radius of the sixth lens on the side close to the image plane R 12 Satisfaction ; The radius of curvature of the seventh lens close to the object plane R 13 Satisfaction ; The curvature radius of the seventh lens on the side close to the image plane R 14 Satisfaction ; The radius of curvature of the eighth lens on the side close to the object plane R15 satisfy ; The curvature radius of the eighth lens on the side close to the image plane R 16 Satisfaction .

2. The visible-near-infrared spectrum imaging lens according to claim 1, characterized in that: The center thickness of the first lens d 1 Satisfaction ; The center thickness of the second lens d 2 Satisfaction ; The central thickness of the third lens d 3. Satisfaction ; The center thickness of the fourth lens d 4 Satisfaction ; The central thickness of the fifth lens d 5 Satisfaction ; The central thickness of the sixth lens d 6 Satisfaction ; The center thickness d7 of the seventh lens satisfies ; The central thickness d8 of the eighth lens satisfies ; The center thickness of the integrated filter d 9 Satisfaction .

3. The visible-near-infrared spectrum imaging lens according to claim 1, characterized in that: The distance between the side of the first lens close to the image plane and the side of the second lens close to the object plane p 1 Satisfaction ; The distance between the side of the second lens close to the image plane and the side of the third lens close to the object plane p 2 Satisfaction ; The distance between the side of the third lens close to the image plane and the side of the fourth lens close to the object plane p 3. Satisfaction ; The distance between the side of the fourth lens close to the image plane and the aperture is p 4 Satisfaction ; The distance between the aperture and the side of the fifth lens close to the object plane p 5 is 1 mm; The distance between the side of the fifth lens close to the image plane and the side of the sixth lens close to the object plane p 6 Satisfaction ; The distance between the side of the sixth lens close to the image plane and the side of the seventh lens close to the object plane p 7 Satisfaction ; The distance between the side of the seventh lens close to the image plane and the side of the eighth lens close to the object plane p 8 Satisfaction ; The distance p9 between the side of the eighth lens close to the image plane and the side of the integrated filter close to the object plane satisfies ; The distance between the side of the integrated filter close to the image plane and the image plane p 10 Satisfaction .

4. The visible-near-infrared spectrum imaging lens according to claim 1, characterized in that: Focal length of the first lens f 1 Satisfaction ; The focal length of the second lens f 2 Satisfaction ; The focal length of the third lens f 3. Satisfaction ; The focal length of the fourth lens f 4 Satisfaction ; The focal length of the fifth lens f 5 Satisfaction ; The focal length of the sixth lens f 6 Satisfaction ; The focal length of the seventh lens f 7 Satisfaction ; The focal length of the eighth lens f 8 Satisfaction .

5. The visible near-infrared spectrum imaging lens according to claim 1, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all made of optical glass.

6. The visible-near-infrared spectrum imaging lens according to claim 1, characterized in that: The cone coefficient k1 of the fourth lens close to the image plane is 8.78; The cone coefficient k2 of the sixth lens on the side close to the image plane is -1.

68.

7. A visible near-infrared telescope, characterized in that: The visible-near-infrared spectrum imaging lens comprises the visible-near-infrared spectrum imaging lens as described in any one of claims 1 to 6.

8. The visible near-infrared spectrum telescope according to claim 7, characterized in that: Applied to visible and near-infrared spectral imaging in the 0.4μm~1.1μm band.

9. The visible near-infrared spectrum telescope according to claim 7, characterized in that: The optical path of the telescope is the image-side telecentric optical path.

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