A medium-wave infrared microscope imaging lens for optical transmission function measuring instrument

Abstract

The present invention relates to a medium-wave infrared microscopic imaging lens for an optical transducer, and relates to the field of optical testing technology. The medium-wave infrared microscopic imaging lens comprises, in sequence along the optical path, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; an aperture stop is provided on the incident surface of the sixth lens. The medium-wave infrared microscopic imaging lens for an optical transducer of the present invention comprises an infinity objective lens connected to an infinity tube lens. The lens is suitable for medium-wave microscopic imaging, exhibits excellent imaging performance, has a wide tolerance, is easy to process and adjust, and offers high testing efficiency and low cost, possessing practical application value.

Description

Technical Field

[0001] The present invention relates to the field of optical testing technology, and in particular to a medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument. Background Art

[0002] Application areas of medium-wave infrared lenses include:

[0003] 1. Military field:

[0004] Enemy reconnaissance: At night or in low-visibility environments, medium-wave infrared lenses can produce clear images, helping military personnel conduct night reconnaissance and monitor enemy actions, such as monitoring personnel activities and equipment deployment in enemy camps.

[0005] Guided weapons: used in guided weapon systems such as missiles, which accurately guide weapons to hit the target by capturing the target's infrared radiation characteristics.

[0006] Night vision equipment: Night vision devices installed in military equipment such as tanks, armored vehicles, and ships enable soldiers to obtain good visual capabilities in dark environments, thereby improving combat effectiveness and survivability.

[0007] Camouflage identification: It can effectively identify the true thermal radiation characteristics of the target object and see through the enemy's camouflage, such as discovering military facilities or personnel camouflaged in woods or grass.

[0008] 2. Security monitoring field:

[0009] Urban security: Installed in city streets, squares, important buildings and other places, it monitors public areas around the clock, promptly detects crimes such as theft, robbery, and vandalism, and ensures the safety and order of the city.

[0010] Traffic monitoring: used to monitor the driving conditions of vehicles on the road, such as identifying the vehicle's license plate, model, driving speed and other information. It can also monitor traffic accidents, road congestion and other conditions at night or in bad weather, providing a basis for traffic management and command.

[0011] Border patrol: In border areas, the border line can be monitored to detect illegal border crossings and prevent infiltration by terrorists, smugglers and other criminals.

[0012] Park monitoring: In closed areas such as industrial parks, science and technology parks, and residential communities, personnel, vehicles, and facilities within the park are monitored and managed to ensure the safety and normal operation of the park.

[0013] 3. Industrial testing:

[0014] Thermal imaging: Detects heat in industrial equipment, pipelines, circuits, and more, promptly identifying overheating and malfunctions to prevent equipment damage and accidents. For example, thermal imaging can detect hot spots in electrical equipment to facilitate timely maintenance and repairs.

[0015] Temperature control: In industrial production processes, medium-wave infrared lenses are used to monitor and control temperature to ensure process stability and product quality. For example, in high-temperature industrial production processes such as steel smelting and glass manufacturing, medium-wave infrared lenses can monitor the temperature inside the furnace in real time.

[0016] Production process control: Monitor product quality on industrial production lines, such as detecting surface defects, welding quality, and packaging integrity. For example, in the electronics manufacturing industry, it can detect whether the soldering of chips is good.

[0017] Material analysis: Analyze the composition and structure of the material, and determine the type, purity and other information of the material by analyzing the infrared absorption spectrum of the material.

[0018] 4. Medical diagnosis field:

[0019] Temperature detection: In public places such as hospitals, airports, and stations, human body temperature can be measured quickly and accurately to screen patients with fever, which is of great significance for the prevention and control of infectious diseases.

[0020] Thermal imaging diagnosis: Helps doctors observe and diagnose patients' tissue lesions, inflammation, blood circulation, and other conditions. For example, by detecting the thermal distribution of breast tissue, it can assist in the diagnosis of breast diseases; by detecting thermal radiation from joints, it can diagnose diseases such as arthritis.

[0021] 5. Firefighting and rescue field:

[0022] At the fire scene, medium-wave infrared lenses can penetrate smoke and dust, helping firefighters quickly find the source of the fire, trapped people, understand the structure and layout of the fire scene, formulate reasonable rescue plans, and improve rescue efficiency and safety.

[0023] 6. Aerospace:

[0024] Used for thermal control system monitoring and fault detection of aerospace equipment such as aircraft and satellites, as well as observation and research of infrared radiation of celestial bodies in space environment.

[0025] In summary, as a unique optical imaging tool, mid-wave infrared imaging lenses demonstrate broad application prospects and enormous development potential across multiple fields. With the continuous advancement and innovation of science and technology, we believe that infrared optical lenses will play an even more important role in the future, bringing greater convenience and safety to people's lives. The imaging quality of mid-wave infrared imaging lenses in various application fields is particularly important, and optical transfer function meters can objectively evaluate the imaging quality of mid-wave infrared imaging lenses.

[0026] An optical transfer function (OTF) instrument consists of a target generator, collimator, and image analyzer. The medium-wavelength infrared (MWIR) microscope imaging lens is a crucial component of the image analyzer, and its designed imaging results are crucial for the overall performance of the instrument. However, existing MWIR optical lens TTF testing equipment must be imported from abroad, and the associated equipment costs are high. Summary of the Invention

[0027] The present invention aims to solve the technical problems in the prior art that medium-wave infrared optical lens transmission coefficient test equipment needs to be imported from abroad and the supporting equipment requires high funding, and to provide a medium-wave infrared microscopic imaging lens for optical transmission coefficient measuring instrument with excellent imaging performance, easy processing and assembly, and low cost.

[0028] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0029] A medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence along the propagation direction of the optical path; an aperture stop is provided on the incident surface of the sixth lens;

[0030] The radius of curvature of the incident surface of the first lens is -9.966±0.01mm, and the radius of curvature of the exit surface of the first lens is -10.372±0.01mm;

[0031] The radius of curvature of the incident surface of the second lens is 127.335±0.01mm, and the radius of curvature of the exit surface of the second lens is 32.398±0.01mm;

[0032] The radius of curvature of the incident surface of the third lens is 56.668±0.01mm, and the radius of curvature of the exit surface of the third lens is -78.986±0.01mm;

[0033] The radius of curvature of the incident surface of the fourth lens is -60.148±0.01mm, and the radius of curvature of the exit surface of the fourth lens is -108.897±0.01mm;

[0034] The curvature radius of the incident surface of the fifth lens is -29.687±0.01mm, and the curvature radius of the exit surface of the fifth lens is -21.095±0.01mm;

[0035] The radius of curvature of the incident surface of the sixth lens is 195.756±0.01 mm, and the radius of curvature of the exit surface of the sixth lens is 323.541±0.01 mm.

[0036] In the above technical solution, the refractive indices of the materials of the first lens, the third lens, the fifth lens and the sixth lens are 3.4268194719 to 3.4225555503 respectively; the refractive indices of the materials of the second lens and the fourth lens are 4.0292113269 to 4.0176056075 respectively.

[0037] In the above technical solution, the materials of the first lens, the third lens, the fifth lens, and the sixth lens are respectively made of silicon; and the materials of the second lens and the fourth lens are respectively made of germanium.

[0038] In the above technical solution, the object distance is 5.000±0.01mm;

[0039] The center distance between the first lens and the second lens is 0.03±0.01mm;

[0040] The center distance between the second and third lenses is 0.82±0.01mm;

[0041] The center distance between the third and fourth lenses is 15.34±0.01mm;

[0042] The center distance between the fourth lens and the fifth lens is 1.28±0.01mm;

[0043] The center distance between the fifth lens and the sixth lens is 10.0±1 mm;

[0044] The center distance between the sixth lens and the image plane is 196.830±1 mm.

[0045] In the above technical solution, the center thickness of the first lens is 3.0±0.01mm; the center thickness of the second lens is 2.4±0.01mm; the center thickness of the third lens is 3.5±0.01mm; the center thickness of the fourth lens is 2.0±0.01mm; the center thickness of the fifth lens is 3.0±0.01mm; and the center thickness of the sixth lens is 4.0±0.01mm.

[0046] In the above technical solution, the wavelength range is 3.7 μm to 4.8 μm.

[0047] In the above technical solution, the numerical aperture is 0.5.

[0048] In the above technical solution, the magnification is 10 times.

[0049] In the above technical solution, the object height is 1.24 mm.

[0050] The present invention has the following beneficial effects:

[0051] The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument of the present invention is composed of an infinity objective lens connected to an infinity tube lens. The lens is suitable for medium-wave microscopic imaging and has excellent imaging performance. It has a loose tolerance capacity and is easy to process and adjust. It has high testing efficiency and low cost, and has practical application value.

[0052] The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument of the present invention corrects spherical aberration by matching the positive and negative optical powers of multiple lenses based on aberration theory; corrects positional chromatic aberration by selecting appropriate lens materials, curvature radii, and spacing; and is designed to have imaging quality close to the diffraction limit, thus meeting the use requirements of an optical transmission function measuring instrument.

[0053] By using the medium-wave infrared microscopic imaging lens for an optical transfer function measuring instrument of the present invention, the domestically developed optical transfer function measuring instrument can achieve the accuracy of the imported f4000 type equipment, which can save a lot of costs for purchasing foreign imported equipment for domestic purchasing units. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] Figure 1 The figure is a schematic diagram of the optical design of the medium-wave infrared microscopic imaging lens for the optical transmission function measuring instrument of the present invention.

[0056] Figure 2 Schematic diagram of the diffuse spot of the medium-wave infrared microscopic imaging lens used in the optical transmission function measuring instrument of the present invention.

[0057] Figure 3 Schematic diagram of field curvature and distortion of the medium-wave infrared microscopic imaging lens used in the optical transmission function measuring instrument of the present invention.

[0058] Figure 4 The figure is a schematic diagram of an optical transfer function curve of a medium-wave infrared microscopic imaging lens for an optical transfer function measuring instrument according to the present invention. DETAILED DESCRIPTION

[0059] The medium-wave infrared microscopic imaging lens for an optical transmission signal measuring instrument of the present invention comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, arranged in sequence along the optical path propagation direction; the first lens is a concave-convex positive lens, the second lens is a convex-concave negative lens, the third lens is a convex-convex positive lens, the fourth lens is a concave-convex negative lens, the fifth lens is a concave-convex positive lens, and the sixth lens is a convex-concave positive lens. The first five lenses together form the objective lens of the medium-wave infrared microscopic imaging lens, and the sixth lens is a rear tube lens. Parallel light is generated between the objective lens and the tube lens. During use, the tube lens and the imaging device at the rear image plane can be aligned, and then the front objective lens can be installed.

[0060] The aperture diaphragm is placed on the incident surface of the sixth lens. The aperture diaphragm determines the entrance pupil diameter and numerical aperture of the system. The size of the image formed by the aperture diaphragm in object space is the entrance pupil diameter, and the size of the image formed by the image aperture is the exit pupil diameter. The aperture diaphragm is placed on the last lens (the sixth lens) counted from left to right, so that the diameter of the light beam entering the imaging device can be determined by the rear end tube lens.

[0061] The object under test is located 5,000 mm in front of the MWIR microscope lens. The MWIR imaging device is located on the image plane. The MWIR microscope lens has a numerical aperture of 0.5 and a magnification of 10.

[0062] The above-mentioned lens is a medium-wave infrared achromatic optical imaging lens with a wavelength range of 3.7μm to 4.8μm. It receives medium-wave spectral signals through a medium-wave infrared imaging device, and obtains the optical transfer function of the lens under test by analyzing and calculating the optical signals.

[0063] The medium-wave infrared microscopic imaging lens for the optical transmission function measuring instrument of the present invention adopts two materials with different dispersion coefficients. The refractive index of the first material is 3.4268194719-3.4225555503, and the refractive index of the second material is 4.0292113269-4.0176056075.

[0064] The first material is silicon, the second material is germanium, the first lens, the third lens, the fifth lens, and the sixth lens all use the first material, and the second lens and the fourth lens all use the second material.

[0065] From left to right along the direction of optical propagation, the two surfaces of the first lens are the first lens incident surface and the first lens exit surface respectively; the two surfaces of the second lens are the second lens incident surface and the second lens exit surface respectively; the two surfaces of the third lens are the third lens incident surface and the third lens exit surface respectively; the two surfaces of the fourth lens are the fourth lens incident surface and the fourth lens exit surface respectively; the two surfaces of the fifth lens are the fifth lens incident surface and the fifth lens exit surface respectively; the two surfaces of the sixth lens are the sixth lens incident surface and the sixth lens exit surface respectively.

[0066] The numerical aperture of the medium-wave infrared microscopic imaging lens for the optical transmission function measuring instrument of the present invention is 0.5, and the object height is 1.24 mm. It belongs to a small-field-of-view, large-aperture optical system with relatively small field curvature, astigmatism, distortion, and chromatic aberration of magnification. The spherical aberration and position chromatic aberration related to the aperture are mainly considered.

[0067] The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument adopts the matching of positive and negative optical powers of multiple lenses to correct spherical aberration; and selects appropriate lens materials, curvature radius and spacing to correct position chromatic aberration.

[0068] In order to further ensure the imaging quality, the medium-wave infrared microscopic imaging lens for the optical transmission function measuring instrument of the present invention has a curvature radius of the first lens incident surface of -9.966±0.01mm, and a curvature radius of the first lens exit surface of -10.372±0.01mm; a curvature radius of the second lens incident surface of 127.335±0.01mm, and a curvature radius of the second lens exit surface of 32.398±0.01mm; a curvature radius of the third lens incident surface of 56.668±0.01mm, and a curvature radius of the third lens exit surface of 10.372±0.01mm; a curvature radius of the third lens incident surface of 127.335 ... The radius of curvature of the incident surface of the sixth lens is 195.756±0.01mm, and the radius of curvature of the exit surface of the sixth lens is 323.541±0.01mm.

[0069] The meaning of the positive and negative values ​​of the radius of curvature is as follows: when the light propagates from left to right, if the center of curvature of the radius of curvature is to the right of the surface vertex, the radius of curvature is positive; if the center of curvature of the radius of curvature is to the left of the surface vertex, the radius of curvature is negative.

[0070] To better ensure imaging quality, the medium-wave infrared microscopic imaging lens for an optical transmission signal measuring instrument of the present invention has an object distance of 5.000±0.01mm; the center spacing between the first lens and the second lens is 0.03±0.01mm; the center spacing between the second lens and the third lens is 0.82±0.01mm; the center spacing between the third lens and the fourth lens is 15.34±0.01mm; the center spacing between the fourth lens and the fifth lens is 1.28±0.01mm; the center spacing between the fifth lens and the sixth lens is 10.0±1mm; and the center spacing between the sixth lens and the image plane is 196.830±1mm.

[0071] The center thickness of the first lens is 3.0±0.01mm; the center thickness of the second lens is 2.4±0.01mm; the center thickness of the third lens is 3.5±0.01mm; the center thickness of the fourth lens is 2.0±0.01mm; the center thickness of the fifth lens is 3.0±0.01mm; and the center thickness of the sixth lens is 4.0±0.01mm.

[0072] The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument of the present invention has a wavelength range of 3.7 μm to 4.8 μm, a numerical aperture of 0.5, a magnification of 10 times, and an object height of 1.24 mm.

[0073] The present invention will be described in detail below with reference to the accompanying drawings.

[0074] like Figure 1 As shown, the medium-wave infrared microscope imaging lens for an optical transmission function measuring instrument of the present invention comprises, from left to right, the following lens elements, arranged in order along the optical path: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. An aperture stop is positioned on the entrance plane of the sixth lens. The object to be measured is positioned 5.000 mm to the left of the medium-wave infrared microscope imaging lens, and the image plane imaging device is positioned 196.830 mm to the right of the last surface on the right side of the medium-wave infrared microscope imaging lens.

[0075] From left to right along the direction of light propagation, the two surfaces of the first lens are the first lens incident surface S1 and the first lens exit surface S2, the two surfaces of the second lens are the second lens incident surface S3 and the second lens exit surface S4, the two surfaces of the third lens are the third lens incident surface S5 and the third lens exit surface S6, the two surfaces of the fourth lens are the fourth lens incident surface S7 and the fourth lens exit surface S8, the two surfaces of the fifth lens are the fifth lens incident surface S9 and the fifth lens exit surface S10, and the two surfaces of the sixth lens are the sixth lens incident surface S11 and the sixth lens exit surface S12. The curvature radius of the first lens incident surface S1 is -9.966mm, and the curvature radius of the first lens exit surface S2 is -10.372mm; the curvature radius of the second lens incident surface S3 is 127.335mm, and the curvature radius of the second lens exit surface S4 is 32.398mm; the curvature radius of the third lens incident surface S5 is 56.668mm, and the curvature radius of the third lens exit surface S6 is -78.986mm; the curvature radius of the fourth lens incident surface S3 is 127.335mm, and the curvature radius of the second lens exit surface S4 is 32.398mm; the curvature radius of the third lens incident surface S5 is 56.668mm, and the curvature radius of the third lens exit surface S6 is -78.986mm; The radius of curvature of the lens incident surface S7 is -60.148mm, and the radius of curvature of the fourth lens exit surface S8 is -108.897mm; the radius of curvature of the fifth lens incident surface S9 is -29.687mm, and the radius of curvature of the fifth lens exit surface S10 is -21.095mm; the radius of curvature of the sixth lens incident surface S11 is 195.756mm, and the radius of curvature of the sixth lens exit surface S12 is 323.541mm.

[0076] The meanings of positive and negative values ​​of the curvature radius are as follows: Figure 1 As shown, the light propagates from left to right. If the center of curvature of the curvature radius is to the right of the surface vertex, the curvature radius is positive. If the center of curvature of the curvature radius is to the left of the surface vertex, the curvature radius is negative.

[0077] The object distance of the medium-wave infrared microscopic imaging lens for the optical transmission signal measuring instrument of the present invention is 5.000 mm; the center distance between the first lens and the second lens is 0.03 mm; the center distance between the second lens and the third lens is 0.82 mm; the center distance between the third lens and the fourth lens is 15.340 mm; the center distance between the fourth lens and the fifth lens is 1.28 mm; the center distance between the fifth lens and the sixth lens is 10.00 mm; and the center distance between the sixth lens and the image plane is 196.830 mm.

[0078] The center thickness of the first lens is 3.0 mm; the center thickness of the second lens is 2.4 mm; the center thickness of the third lens is 3.5 mm; the center thickness of the fourth lens is 2.0 mm; the center thickness of the fifth lens is 3.0 mm; and the center thickness of the sixth lens is 4.0 mm.

[0079] The first lens, the third lens, the fifth lens and the sixth lens are all made of silicon, and the second lens and the fourth lens are all made of germanium.

[0080] Table 1 Optical element parameters of the medium-wave infrared microscopic imaging lens for the optical transmission function measuring instrument of the present invention

[0081]

[0082] The optical parameters of the medium-wave infrared microscopic imaging lens for the optical transmission function measuring instrument of the present invention are as follows:

[0083] Magnification: 10 times;

[0084] Numerical aperture: 0.5;

[0085] Wavelength: 3.7μm~4.8μm;

[0086] Object line field of view: 1.24mm;

[0087] Object distance: 5.000mm;

[0088] Rear working distance: 196.83mm;

[0089] Lens length: 45.37mm;

[0090] Object-to-image distance: 247.2mm.

[0091] The medium-wave infrared microscopic imaging lens for an optical transmission signal measuring instrument of the present invention is a medium-wave microscopic imaging lens with a wavelength range from 3.7 μm to 4.8 μm. It receives a medium-wave infrared spectrum signal, analyzes and calculates the imaging medium-wave information, and is applied to the optical transmission signal measuring instrument to test the imaging performance of infrared lenses in various fields such as military, security, industrial detection, medical diagnosis, fire rescue, and aerospace.

[0092] Depend on Figure 2 It can be seen from the diffuse spot diagram shown that the diffuse spots in each field of view of the lens of the present invention are well corrected. The radius of the diffuse spot in the central field of view is within the Airy disk, the RMS value of the diffuse spot radius on the axis is 15.406μm, and the RMS value of the diffuse spot radius at the maximum off-axis field of view is 28.068μm.

[0093] Depend on Figure 3 As shown in the field curvature and distortion diagrams, the maximum field curvature of the lens of the present invention is 0.0334 mm, and the maximum distortion is 0.0712%.

[0094] Depend on Figure 4 It can be seen from the optical transfer function curve shown that the optical transfer function of each field of view of the lens of the present invention is close to the diffraction limit.

[0095] In summary, the quality of the medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument of the present invention can meet the use requirements of the optical transmission function measuring instrument.

[0096] The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument of the present invention is composed of an infinity objective lens connected to an infinity tube lens. The lens is suitable for medium-wave microscopic imaging and has excellent imaging performance. It has a loose tolerance capacity and is easy to process and adjust. It has high testing efficiency and low cost, and has practical application value.

[0097] The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument of the present invention corrects spherical aberration by matching the positive and negative optical powers of multiple lenses based on aberration theory; corrects positional chromatic aberration by selecting appropriate lens materials, curvature radii, and spacing; and is designed to have imaging quality close to the diffraction limit, thus meeting the use requirements of an optical transmission function measuring instrument.

[0098] By using the medium-wave infrared microscopic imaging lens for an optical transfer function measuring instrument of the present invention, the domestically developed optical transfer function measuring instrument can achieve the accuracy of the imported f4000 type equipment, which can save a lot of costs for purchasing foreign imported equipment for domestic purchasing units.

[0099] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument, characterized in that: The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially arranged along the light path propagation direction; an aperture stop is provided on the incident surface of the sixth lens; The radius of curvature of the incident surface of the first lens is -9.966±0.01mm, and the radius of curvature of the exit surface of the first lens is -10.372±0.01mm; The radius of curvature of the incident surface of the second lens is 127.335±0.01mm, and the radius of curvature of the exit surface of the second lens is 32.398±0.01mm; The radius of curvature of the incident surface of the third lens is 56.668±0.01mm, and the radius of curvature of the exit surface of the third lens is -78.986±0.01mm; The radius of curvature of the incident surface of the fourth lens is -60.148±0.01mm, and the radius of curvature of the exit surface of the fourth lens is -108.897±0.01mm; The curvature radius of the incident surface of the fifth lens is -29.687±0.01mm, and the curvature radius of the exit surface of the fifth lens is -21.095±0.01mm; The radius of curvature of the incident surface of the sixth lens is 195.756±0.01 mm, and the radius of curvature of the exit surface of the sixth lens is 323.541±0.01 mm.

2. The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument according to claim 1, characterized in that: The refractive indices of the materials of the first, third, fifth, and sixth lenses are 3.4268194719 to 3.4225555503 respectively; The refractive indexes of the materials of the second lens and the fourth lens are 4.0292113269 to 4.0176056075 respectively.

3. The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument according to claim 2, characterized in that: The first lens, the third lens, the fifth lens, and the sixth lens are made of silicon; the second lens and the fourth lens are made of germanium.

4. The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument according to claim 1, characterized in that: Object distance is 5.000±0.01mm; The center distance between the first lens and the second lens is 0.03±0.01mm; The center distance between the second and third lenses is 0.82±0.01mm; The center distance between the third and fourth lenses is 15.34±0.01mm; The center distance between the fourth lens and the fifth lens is 1.28±0.01mm; The center distance between the fifth lens and the sixth lens is 10.0±1 mm; The center distance between the sixth lens and the image plane is 196.830±1 mm.

5. The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument according to claim 1, characterized in that: The center thickness of the first lens is 3.0±0.01mm; the center thickness of the second lens is 2.4±0.01mm; the center thickness of the third lens is 3.5±0.01mm; the center thickness of the fourth lens is 2.0±0.01mm; the center thickness of the fifth lens is 3.0±0.01mm; and the center thickness of the sixth lens is 4.0±0.01mm.

6. The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument according to any one of claims 1 to 5, characterized in that: The wavelength range is 3.7μm to 4.8μm.

7. The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument according to any one of claims 1 to 5, characterized in that: The numerical aperture is 0.

5.

8. The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument according to any one of claims 1 to 5, characterized in that: The magnification is 10x.

9. The medium-wave infrared microscopic imaging lens for an optical transmission function measuring instrument according to any one of claims 1 to 5, characterized in that: The object height is 1.24mm.

Images