Large-field-of-view, large-aperture, low-light-level objective system based on large imaging target surface

Abstract

The present invention provides a large-field-of-view large-aperture micro-light objective system based on a large imaging target surface, and belongs to the field of imaging technology. The large-field-of-view large-aperture micro-light objective system based on a large imaging target surface of the present invention comprises: a front lens group, an aperture and a rear lens group arranged in sequence from the object plane to the image plane along the optical axis. The front lens group comprises a first lens, a second lens, a third lens and a fourth lens arranged in sequence along the incident direction of light. The rear lens group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the incident direction of light. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are all spherical lenses. Each lens of the present invention adopts a spherical lens, which effectively reduces the manufacturing cost and the difficulty of assembly and adjustment, and has a higher resolution, and can be applied to a larger relative aperture and a wider band.

Description

Technical Field

[0001] The invention belongs to the field of imaging technology, and in particular relates to a large-viewing-field and large-aperture micro-light objective system based on a large imaging target surface. Background Art

[0002] As optical instruments are increasingly used, the development of large imaging target detectors is becoming more and more mature. Existing large-field-of-view and large-aperture objective optical systems are all based on smaller imaging targets (1 inch or less), which makes it difficult to balance the field of view and viewing distance. In addition, in order to improve the image quality, a large number of aspheric lenses are used, which greatly increases the manufacturing cost and makes it difficult to promote the product. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] The present invention provides a large-viewing-field, large-aperture, micro-light objective lens system based on a large imaging target surface, comprising: a front lens group, an aperture and a rear lens group arranged in sequence from the object surface to the image surface along the optical axis. The front lens group comprises a first lens, a second lens, a third lens and a fourth lens arranged in sequence along the incident direction of light. The first lens and the second lens have negative optical focal lengths. The third lens and the fourth lens have positive optical focal lengths. The rear lens group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the incident direction of light. The fifth lens, the sixth lens and the eighth lens have positive optical focal lengths. The seventh lens, the ninth lens and the tenth lens have negative optical focal lengths. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are all spherical lenses.

[0005] Optionally, the sixth lens and the seventh lens form a first cemented lens, and the eighth lens and the ninth lens form a second cemented lens.

[0006] Optionally, the objective lens system has a focal length of 17 mm, a total optical length of 174 mm, a lens F number of 1.2, an applicable wavelength band of 500 to 950 nm, a horizontal distortion of -11%, a vertical distortion of -6.4%, and a field of view of 71.2°×54.3° after considering the distortion.

[0007] Optionally, each lens of the objective lens system is made of white light glass. Each lens of the objective lens system is coated to a near infrared band.

[0008] Optionally, the first lens is a negative meniscus lens, the second lens is a biconcave lens, the third lens is a biconvex lens, and the fourth lens is a positive meniscus lens.

[0009] Optionally, the focal lengths of the first lens to the fourth lens are f1 to f4, respectively. -94mm <f1<-93mm。-60mm<f2<-59mm。69mm<f3<70mm。114mm<f4<115mm。

[0010] Optionally, the fifth lens is a plano-convex lens, the sixth lens is a positive meniscus lens, the seventh lens is a negative meniscus lens, the eighth lens is a biconvex positive lens, the ninth lens is a negative meniscus lens, and the tenth lens is a plano-concave lens.

[0011] Optionally, the focal lengths of the fifth lens to the tenth lens are f5 to f10, respectively. 99 mm <f5<100mm。30mm<f6<31mm。-36mm<f7<-35mm。19mm<f8<20mm。-59mm<f9<-58mm。-31mm<f10<-30mm。

[0012] Optionally, the air space between the front lens group and the aperture is 10-10.2 mm, and the air space between the aperture and the rear lens group is 6.99-7.01 mm.

[0013] Optionally, the air spacing between the first lens and the second lens is 20.8 to 30 mm. The air spacing between the second lens and the third lens is 14.8 to 15 mm. The air spacing between the third lens and the fourth lens is 21.5 to 21.7 mm. The air spacing between the fifth lens and the sixth lens is 2.7 to 2.9 mm. The air spacing between the seventh lens and the eighth lens is 0.2 to 0.4 mm. The air spacing between the ninth lens and the tenth lens is 5.4 to 5.6 mm.

[0014] Beneficial Effects

[0015] The present invention provides a large-viewing-field, large-aperture, micro-light objective lens system based on a large imaging target surface, comprising: a front lens group, an aperture, and a rear lens group arranged in sequence from the object surface to the image surface along the optical axis. The front lens group comprises a first lens, a second lens, a third lens, and a fourth lens arranged in sequence along the incident direction of light. The rear lens group comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged in sequence along the incident direction of light. The present invention distributes and combines the focal lengths of the lenses arranged in sequence from the object surface to the image surface, so that the objective lens system has a higher resolution, can be applied to a larger relative aperture and a wider band, can achieve day and night confocality, and can have better imaging quality under extreme environments of -30°C to 50°C. In addition, each lens of the present invention adopts a spherical lens, which effectively reduces the manufacturing cost and the difficulty of assembly and adjustment, and is convenient for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A schematic diagram of the structure and optical path of a large-viewing-field and large-aperture micro-light objective lens system based on a large imaging target surface according to an embodiment of the present invention;

[0017] Figure 2 An MTF curve diagram of a large-viewing-field and large-aperture micro-light objective lens system based on a large imaging target surface according to an embodiment of the present invention;

[0018] Figure 3 An optical point diagram of a large-viewing-field and large-aperture micro-light objective lens system based on a large imaging target surface according to an embodiment of the present invention;

[0019] Figure 4 An optical field curvature-distortion curve diagram of a large-field-of-view, large-aperture micro-light objective system based on a large imaging target surface according to an embodiment of the present invention.

[0020] The reference numerals are:

[0021] 1. Front lens group; 2. Aperture; 3. Rear lens group; 4. Image plane;

[0022] 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens;

[0023] 31. fifth lens; 32. sixth lens; 33. seventh lens; 34. eighth lens; 35. ninth lens; 36. tenth lens. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] This embodiment provides a large-field-of-view, large-aperture, low-light objective lens system based on a large imaging target surface. Figure 1 A schematic diagram of the structure and optical path of a large-field-of-view, large-aperture, micro-light objective lens system based on a large imaging target surface provided in this embodiment.

[0029] like Figure 1 As shown, the large-field-of-view large-aperture micro-light objective lens system based on a large imaging target surface of this embodiment includes: a front lens group 1, an aperture 2 and a rear lens group 3 arranged in sequence from the object plane to the image plane 4 along the optical axis. The front lens group 1 includes a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14 arranged in sequence along the incident direction of the light. The first lens 11 and the second lens 12 have negative optical focal lengths. The third lens 13 and the fourth lens 14 have positive optical focal lengths. The rear lens group 3 includes a fifth lens 31, a sixth lens 32, a seventh lens 33, an eighth lens 34, a ninth lens 35 and a tenth lens 36 arranged in sequence along the incident direction of the light. The fifth lens 31, the sixth lens 32 and the eighth lens 34 have positive optical focal lengths. The seventh lens 33, the ninth lens 35 and the tenth lens 36 have negative optical focal lengths. The first lens 11 , the second lens 12 , the third lens 13 , the fourth lens 14 , the fifth lens 31 , the sixth lens 32 , the seventh lens 33 , the eighth lens 34 , the ninth lens 35 and the tenth lens 36 are all spherical lenses.

[0030] In some examples, such as Figure 1 As shown, the large-field-of-view, large-aperture, low-light-level objective lens system based on a large imaging target surface in this embodiment is a fixed-focus objective lens. The fixed-focus objective lens has a fixed focal length and a large aperture, which can obtain more light at the same brightness, improve the shooting sensitivity, and is compact and light, easy to carry and use, and has a low cost.

[0031] The large-viewing-field, large-aperture, micro-light objective lens system based on a large imaging target surface of this embodiment comprises a front lens group 1, an aperture 2 and a rear lens group 3 arranged in sequence from the object plane to the image plane along the optical axis. The front lens group 1 comprises a first lens 11, a second lens 12, a third lens 13 and a fourth lens 14 arranged in sequence along the incident direction of the light. The rear lens group 3 comprises a fifth lens 31, a sixth lens 32, a seventh lens 33, an eighth lens 34, a ninth lens 35 and a tenth lens 36 arranged in sequence along the incident direction of the light. The present invention allocates and combines the focal lengths of the lenses arranged in sequence from the object plane to the image plane, so that the objective lens system has a higher resolution, can be applied to a larger relative aperture and a wider band, can achieve day and night confocality, and can have better imaging quality under extreme environments of -30°C to 50°C. In addition, each lens of the present invention adopts a spherical lens, which effectively reduces the manufacturing cost and the difficulty of assembly and adjustment, and is convenient for mass production.

[0032] In some embodiments, Figure 1 As shown, the sixth lens 32 and the seventh lens 33 form a first cemented lens, and the eighth lens 34 and the ninth lens 35 form a second cemented lens.

[0033] For some examples, see Figure 1 , the sixth lens 32 and the seventh lens 33 are glued together by photosensitive adhesive to form a first glued lens. The eighth lens 34 and the ninth lens 35 are glued together by photosensitive adhesive to form a second glued lens. This embodiment uses photosensitive adhesive as the adhesive between the two lenses, which has the advantages of fast curing, no volatility and high transparency. While being environmentally friendly, it can also meet the use requirements of glued lenses.

[0034] In this embodiment, the sixth lens 32 and the seventh lens 33 are combined into a first cemented lens, and the eighth lens 34 and the ninth lens 35 are combined into a second cemented lens, so as to form two groups of cemented lenses in the lens system. The two groups of cemented lenses can complementarily correct spherical aberration and chromatic aberration, reduce light energy loss, and further improve imaging quality.

[0035] In some embodiments, see Figure 1 The focal length of the objective lens system is 17mm, the total optical length is 174mm, the lens F number is 1.2, the applicable band is 500-950nm, the horizontal distortion is -11%, the vertical distortion is -6.4%, and the field of view after considering the distortion is 71.2°×54.3°.

[0036] The objective lens system of this embodiment has a focal length of 17 mm, a total optical length of 174 mm, a lens F number of 1.2, an applicable wavelength band of 500 to 950 nm, a horizontal distortion of -11%, a vertical distortion of -6.4%, and a field of view of 71.2°×54.3° after distortion. It has a compact structure, a small size, and high brightness, a wide applicable wavelength band, small lens distortion, and good optical stability and imaging clarity.

[0037] However, it is understandable that, in other embodiments, the focal length of the lens may allow a tolerance of 5%, and the F number may also fluctuate within a certain range, such as between 1.2 and 1.3.

[0038] In some embodiments, Figure 1 As shown, all lenses of the objective system are made of white light glass. All lenses of the objective system are coated to the near infrared band.

[0039] Each lens of the objective lens system of this embodiment is made of glass lenses and is white light glass, which has good light transmission ability and is conducive to improving imaging quality. Each lens is coated to the near-infrared band, which is conducive to improving the structural strength of each lens, protecting each lens, reducing reflection and improving transmittance.

[0040] In some embodiments, Figure 1 As shown, the first lens 11 is a negative meniscus lens, the second lens 12 is a double concave lens, the third lens 13 is a double convex lens, and the fourth lens 14 is a positive meniscus lens.

[0041] In some examples, such as Figure 1 As shown, the object side of the first lens 11 is convex, and the image side is concave. The object side and the image side of the second lens 12 are both concave. The object side and the image side of the third lens 13 are both convex. The object side of the fourth lens 14 is convex, and the image side is concave. In this way, the incident light input into the objective lens system can be adjusted to achieve efficient correction of the spherical aberration of the objective lens system, while reducing the size of the lens formed by the objective lens system.

[0042] In this embodiment, the first lens 11 is a negative meniscus lens, the second lens 12 is a biconcave lens, the third lens 13 is a biconvex lens, and the fourth lens 14 is a positive meniscus lens. The front lens group composed in this way can efficiently correct the spherical aberration of the objective lens system and improve the imaging quality of the objective lens system.

[0043] In some embodiments, see Figure 1 , the focal lengths of the first lens 11 to the fourth lens 14 are f1 to f4 respectively. -94mm <f1<-93mm。-60mm<f2<-59mm。69mm<f3<70mm。114mm<f4<115mm。

[0044] In this embodiment, by reasonably allocating the focal lengths of the first lens 11 to the fourth lens 14 , the objective lens system can have smaller spherical aberration and field curvature, thereby ensuring higher imaging quality both on the optical axis and off the optical axis.

[0045] In some embodiments, Figure 1 As shown, the fifth lens 31 is a plano-convex lens, the sixth lens 32 is a positive meniscus lens, the seventh lens 33 is a negative meniscus lens, the eighth lens 34 is a double-convex positive lens, the ninth lens 35 is a negative meniscus lens, and the tenth lens 36 is a plano-concave lens.

[0046] In some examples, such as Figure 1 As shown, the object surface side of the fifth lens 31 is convex, and the image surface side is a plane. The object surface side of the sixth lens 32 is concave, and the image surface side is convex. The object surface side of the seventh lens 33 is concave, and the image surface side is convex. The object surface side and the image surface side of the eighth lens 34 are both convex. The object surface side of the ninth lens 35 is concave, and the image surface side is convex. The object surface side of the tenth lens 36 is concave, and the image surface side is a plane. Such an arrangement can further adjust the incident light input to the objective lens system, further correct the chromatic aberration of the objective lens system, and reduce the size of the lens formed by the objective lens system.

[0047] In this embodiment, the fifth lens 31 is a plano-convex lens, the sixth lens 32 is a positive meniscus lens, the seventh lens 33 is a negative meniscus lens, the eighth lens 34 is a double-convex positive lens, the ninth lens 35 is a negative meniscus lens, and the tenth lens 36 is a plano-concave lens. The front lens group composed in this way can efficiently correct the spherical aberration of the objective lens system and improve the imaging quality of the objective lens system.

[0048] In some embodiments, see Figure 1 , the focal lengths of the fifth to tenth lenses are f5 to f10. 99mm <f5<100mm。30mm<f6<31mm。-36mm<f7<-35mm。19mm<f8<20mm。-59mm<f9<-58mm。-31mm<f10<-30mm。

[0049] In this embodiment, by reasonably allocating the focal lengths of the fifth lens 31 to the tenth lens 36 , the objective lens system can have smaller spherical aberration and field curvature, thereby ensuring higher imaging quality both on the optical axis and off the optical axis.

[0050] In some embodiments, see Figure 1 , the air gap between the front lens group 1 and the aperture 2 is 10 to 10.2 mm. The air gap between the aperture 2 and the rear lens group 3 is 6.99 to 7.01 mm.

[0051] For some examples, see Figure 1The air interval between the front lens group 1 and the aperture 2 is preferably 10.1 mm. The air interval between the aperture 2 and the rear lens group 3 is preferably 7.0 mm. With such an arrangement, the structure is more reasonable and the imaging quality is higher.

[0052] This embodiment can ensure the balance of the incident angles of the front and rear lens groups by reasonably setting the air gap between the front lens group 1 and the aperture 2 and the air gap between the aperture 2 and the rear lens group 3, so as to avoid sensitive aberrations and reduce the difficulty of installation and adjustment.

[0053] In some embodiments, see Figure 1 , the air interval between the first lens 11 and the second lens 12 is 20.8-30 mm. The air interval between the second lens 12 and the third lens 13 is 14.8-15 mm. The air interval between the third lens 13 and the fourth lens 14 is 21.5-21.7 mm. The air interval between the fifth lens 31 and the sixth lens 32 is 2.7-2.9 mm. The air interval between the seventh lens 33 and the eighth lens 34 is 0.2-0.4 mm. The air interval between the ninth lens 35 and the tenth lens 36 is 5.4-5.6 mm.

[0054] For some examples, see Figure 1 , the air spacing between the first lens 11 and the second lens 12 is 20.9mm. The air spacing between the second lens 12 and the third lens 13 is 14.9mm. The air spacing between the third lens 13 and the fourth lens 14 is 21.6mm. The air spacing between the fifth lens 31 and the sixth lens 32 is 2.8mm. The air spacing between the seventh lens 33 and the eighth lens 34 is 0.3mm. The air spacing between the ninth lens 35 and the tenth lens 36 is 5.5mm. Such an arrangement can make the spacing between two adjacent lenses more scientific and reasonable, which is conducive to improving the imaging quality of the objective lens system.

[0055] In this embodiment, the imaging clarity can be further improved by reasonably setting the air intervals between the first lens 11 to the fourth lens 14 and the air intervals between the fifth lens 31 to the tenth lens 36 .

[0056] In some embodiments, the design parameters of each lens in the objective lens system are shown in Table 1.

[0057] Table 1

[0058]

[0059]

[0060] The above embodiments can achieve the effect of parfocality during the day and night by complementing the aberrations of the front lens group 1 and the rear lens group 3, and by complementary correction of spherical aberration and chromatic aberration by the two groups of cemented lenses in the rear lens group 3, and can achieve high-definition camera level at a relatively low cost, and achieve a large relative aperture and a large field of view. Not only can high-quality pixels be achieved during the day, but also high-definition image quality can be achieved at night or in low light conditions, and it can still meet the requirements of use in environments with different temperatures. The refractive index and optical focal length of the entire lens system are reasonably distributed, which can ensure the balance of the incident angles of the front lens group and the rear lens group to avoid sensitive aberrations and reduce the difficulty of installation and adjustment. And by reasonably distributing the focal lengths of each lens, the spherical aberration and field curvature of the objective lens system are simultaneously small, ensuring that both on-axis and off-axis have high imaging quality.

[0061] Figure 2 This is an MTF curve of a large field of view, large aperture, micro-light objective lens system based on a large imaging target surface in this embodiment. The horizontal axis of the curve in the figure is the spatial frequency (lp / mm), and the vertical axis is the MTF value. Figure 2 It can be seen that the imaging quality of the objective lens system of this embodiment is good and can meet the usage requirements.

[0062] Figure 3 : is the optical point diagram of the large-viewing-field and large-aperture micro-light objective lens system based on the large imaging target surface of this embodiment. Figure 3 It can be seen that the RMS diffuse spot radius of each field of view meets the requirements, and the energy concentration of the system is good.

[0063] Figure 4 This is an optical field curvature-distortion curve diagram of a large field of view, large aperture, micro-light objective lens system based on a large imaging target surface according to an embodiment of the present invention. The horizontal axis on the left is millimeters, and the horizontal axis on the right is percentage. Figure 4 It can be seen that the field curvature and distortion of the lens do not affect the imaging quality within the corresponding field of view, and its field curvature and distortion are well corrected.

[0064] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A large-viewing-field, large-aperture, low-light objective lens system based on a large imaging target surface, characterized in that: include: A front lens group, an aperture, and a rear lens group are arranged in sequence from the object plane to the image plane along the optical axis; The front lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged in sequence along the incident direction of light; the first lens and the second lens have negative optical power; the third lens and the fourth lens have positive optical power; The rear lens group includes a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along the incident direction of light; the fifth lens, the sixth lens and the eighth lens have positive optical power; the seventh lens, the ninth lens and the tenth lens have negative optical power; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are all spherical lenses; The focal lengths of the first to fourth lenses are f1 to f4 respectively; -94mm <f1<-93mm;-60mm<f2<-59mm;69mm<f3<70mm;114mm<f4<115mm; The focal lengths of the fifth to tenth lenses are f5 to f10 respectively; 99mm <f5<100mm;30mm<f6<31mm;-36mm<f7<-35mm;19mm<f8<20mm;-59mm<f9<-58mm;-31mm<f10<-30mm; The air gap between the first lens and the second lens is 20.8-30 mm; the air gap between the second lens and the third lens is 14.8-15 mm; the air gap between the third lens and the fourth lens is 21.5-21.7 mm; the air gap between the fifth lens and the sixth lens is 2.7-2.9 mm; the air gap between the seventh lens and the eighth lens is 0.2-0.4 mm; the air gap between the ninth lens and the tenth lens is 5.4-5.6 mm.

2. The large-viewing-field, large-aperture, micro-light objective lens system based on a large imaging target surface according to claim 1, characterized in that: The sixth lens and the seventh lens form a first cemented lens; the eighth lens and the ninth lens form a second cemented lens.

3. The large-viewing-field, large-aperture, micro-light objective lens system based on a large imaging target surface according to claim 1, characterized in that: The objective lens system has a focal length of 17 mm, a total optical length of 174 mm, a lens F number of 1.2, an applicable wavelength of 500 to 950 nm, a horizontal distortion of -11%, a vertical distortion of -6.4%, and a field of view of 71.2°×54.3° after considering the distortion.

4. The large-viewing-field, large-aperture, micro-light objective lens system based on a large imaging target surface according to claim 1, characterized in that: Each lens of the objective lens system is made of white light glass; each lens of the objective lens system is coated to the near-infrared band.

5. The large-viewing-field, large-aperture, micro-light objective lens system based on a large imaging target surface according to claim 1, characterized in that: The first lens is a negative meniscus lens, the second lens is a biconcave lens, the third lens is a biconvex lens, and the fourth lens is a positive meniscus lens.

6. The large-viewing-field, large-aperture, micro-light objective lens system based on a large imaging target surface according to claim 1, characterized in that: The fifth lens is a plano-convex lens, the sixth lens is a positive meniscus lens, the seventh lens is a negative meniscus lens, the eighth lens is a biconvex positive lens, the ninth lens is a negative meniscus lens, and the tenth lens is a plano-concave lens.

7. The large-viewing-field, large-aperture, micro-light objective lens system based on a large imaging target surface according to claim 1, characterized in that: The air gap between the front lens group and the aperture is 10 to 10.2 mm; The air gap between the aperture and the rear lens group is 6.99-7.01 mm.

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