CN113376815B - Wide-view-field high-resolution imaging system based on apochromatic spherical shell type framework - Google Patents

Abstract

The invention discloses a wide-field high-resolution imaging system based on an apochromatic spherical shell type framework, which comprises: a primary objective lens and a secondary imaging lens subsystem; a main objective lens comprising: the first spherical lens, the second spherical lens component, the third spherical lens component and the fourth spherical lens are concentrically arranged in sequence along the optical axis direction; the first spherical lens, the second spherical lens component, the third spherical lens component and the fourth spherical lens form a concentric asymmetric structure; and the secondary imaging lens subsystem is positioned on one side of the primary image surface of the main objective lens, which is opposite to the main objective lens, and is mainly used for correcting the field curvature aberration of the primary image surface and the chromatic aberration of the secondary imaging lens subsystem. The invention improves the acquisition quantity of high-frequency information of the object space target object details by the front-stage main objective lens, improves the detail resolution of the target object, can correct the field curvature aberration of the primary image surface and the self chromatic aberration influencing the resolution by the secondary imaging lens subsystem, and further improves the imaging resolution and the identification precision of the target area.

Description

A wide-field-of-view high-resolution imaging system based on an apochromatic spherical shell architecture

technical field

The invention belongs to the technical field of photoelectric detection, and in particular relates to a wide-field-of-view high-resolution imaging system based on an apochromatic spherical shell structure.

Background technique

Wide-field-of-view, high-resolution optical imaging system has the combined advantages of wide-angle imaging and high-resolution imaging, and can perform multi-target tracking, precise identification and monitoring in a large area, and can be applied to aerospace remote sensing, ecological environment monitoring and other activities Surveillance, large-scale rapid search and tracking of sea glaciers and other targets. The performance of the optical imaging system directly determines the quality of the detailed information of the target in the object space.

At present, the wide field of view imaging technology mainly includes fisheye lens optical imaging technology and multi-scale optical imaging system technology and so on. The fisheye lens system structure is used to realize wide-field staring imaging technology is still widely used. This technology does not have a complicated scanning mechanism to expand the field of view, but it can meet the functions of full-space inclusion and real-time information acquisition in all time domains. Among them, the zoom type fisheye lens system has a larger field of view and a larger relative aperture. The zoom function is realized through the Front zoom group (front zoom group) and the rear zoom group (rear zoom group). Search, identify and track target types within range. The field of view of the fisheye lens can cover a hemispherical plane, even up to 270°, which satisfies a wide field of view but sacrifices resolution.

Although the fisheye optical system achieves wide-field imaging, it has to default to the reasonable existence of barrel distortion in the design results. Except for the central scene of the screen, other scenes that should be horizontal or vertical are deformed, and the edges Excessive distortion results in uneven illumination at the edge of the central region of the image plane, and it is impossible to form a consistent resolution image on the entire image plane and the image resolution is low, making it impossible to accurately identify the target area of interest. The focal length of the zoom structure type fisheye lens becomes longer and the field of view angle becomes smaller during accurate identification. To accurately identify the target in the imaging area of the edge field of view, a corresponding rotating scanning mechanism is required. Therefore, the fisheye lens optical system has many defects in wide field of view imaging and high-resolution accurate identification of targets.

In order to make up for the inadequacy of the fisheye lens optical imaging system that cannot take into account the high resolution in the wide field of view imaging, a multi-scale wide field of view high-resolution optical imaging technology based on concentric spherical lenses is proposed. The front-stage main objective lens adopts Concentric spherical lens to achieve wide field of view, the primary image plane is concentric with the main objective lens, multiple identical secondary imaging systems image the primary image plane of the previous stage main objective lens in different regions, and combine the high-resolution images of multiple secondary systems The sub-image stitching achieves high resolution while ensuring wide field of view imaging.

When the multi-scale wide-field-of-view high-resolution imaging system based on the concentric spherical lens acquires the detailed information of the target object in the object space, as shown in Figure 1, since the front-stage main objective lens adopts a concentric symmetrical four-layer cemented spherical lens, although the corrected Chromatic aberration and some off-axis aberrations, but the axial spherical aberration, secondary spectral aberration and combined aberration contained in the formed primary image plane have not been corrected. The existence of secondary spectral aberration will make the image quality poor. The resolution of object space target details acquired by the system is low, and the secondary spectral aberration is shown in Figure 2. At the same time, the primary image plane that should have participated in the imaging of the secondary system is also replaced by the nearby actual image plane. The resolution of the multi-scale optical system composed of the system drops sharply, which cannot meet the requirements of high resolution. Therefore, due to the poor image quality of the primary image plane formed by the front-stage ball lens in the multi-scale optical imaging system based on the concentric spherical lens, the secondary imaging system array cannot obtain high-frequency detail information, which reduces the overall resolution of the system. The recognition accuracy of the target object is low.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the present invention provides a wide-field-of-view high-resolution imaging system based on an apochromatic spherical shell structure. The technical problem to be solved in the present invention is realized through the following technical solutions:

A wide-field-of-view high-resolution imaging system based on an apochromatic spherical shell structure, including: a main objective lens and a secondary imaging lens subsystem;

The main objective lens includes: a first spherical lens, a second spherical lens assembly, a third spherical lens assembly and a fourth spherical lens arranged concentrically along the optical axis in sequence;

The arc surface of the first spherical lens and the arc surface of the second spherical lens assembly are facing the target object, the arc surface of the third spherical lens assembly and the arc surface of the fourth spherical lens are facing the main objective lens Primary image surface; the second spherical lens assembly and the third spherical lens assembly are located in the space enclosed by the first spherical lens and the fourth spherical lens;

There is a first air gap between the first spherical lens and the second spherical lens assembly, the second spherical lens assembly and the third spherical lens assembly are glued to each other, the third spherical lens assembly and the There is a second air gap between the fourth spherical lenses;

The first spherical lens, the second spherical lens assembly, the third spherical lens assembly and the fourth spherical lens form a concentric asymmetric structure;

The secondary imaging lens subsystem is located on the side of the primary image surface of the primary objective lens facing away from the primary objective lens, and is used to correct the field curvature aberration of the primary image surface and the secondary imaging lens subsystem chromatic aberration; the primary image plane is located on a spherical surface concentric with the main objective lens.

In one embodiment of the present invention, the second spherical lens assembly includes: a first inner lens and a first central lens;

The first inner lens and the first central lens are glued to each other;

The third spherical lens assembly includes: a second central lens and a second inner lens;

The second central lens and the second inner lens are glued to each other;

The first center lens and the second center lens are cemented.

In one embodiment of the present invention, the first spherical lens is a concave lens, and both the outer surface and the inner surface are arcuate surfaces;

The first inner lens is a concave lens, and both the outer surface and the inner surface are arcuate surfaces;

The first central lens is a convex lens, and the arc surface of the first central lens is located on the inner surface of the first inner lens;

The second central lens is a convex lens, and the arc surface of the second central lens is located on the inner surface of the second inner lens;

The second inner lens is a concave lens, and both the outer surface and the inner surface are arcuate surfaces;

The fourth spherical lens is a concave lens, and both the outer surface and the inner surface are arc surfaces.

In one embodiment of the present invention, there are installation gaps for installation between the first spherical lens and the fourth spherical lens, and between the first inner lens and the second inner lens.

In one embodiment of the present invention, the primary image plane is the image plane to be imaged by the secondary imaging lens subsystem; the secondary imaging lens subsystem includes: a plurality of secondary imaging lens assemblies;

The multiple secondary imaging lens assemblies are arranged in an array on a spherical surface concentric with the primary image plane;

The peripheral fields of view of two adjacent secondary imaging lens assemblies overlap.

In one embodiment of the present invention, the secondary imaging lens assembly includes: a first concave lens, a second concave lens, a third plano-convex lens, a fourth concave lens, a fifth bi-convex lens, and a sixth plano-convex lens arranged coaxially in sequence and the seventh concave lens;

The second concave lens and the third plano-convex lens are cemented together;

The fourth concave lens and the fifth bi-convex lens are cemented together.

In one embodiment of the present invention, an aperture is provided between the third plano-convex lens and the fourth concave lens.

In one embodiment of the present invention, the secondary imaging lens assembly is a PETZVAL structure.

Beneficial effects of the present invention:

The imaging system of the present invention is based on the principle of apochromatism, and realizes the correction of spherical aberration, axial chromatic aberration and their combined aberration through the main objective lens of concentric asymmetric structure, and also corrects the secondary spectral aberration at the same time, improving the previous The amount of high-frequency information obtained by the primary objective lens on the details of the target object in the object space improves the detail resolution of the target object, and the field curvature aberration of the primary image surface and its own influence on the resolution can be corrected through the secondary imaging lens subsystem Chromatic aberration further improves the imaging resolution and recognition accuracy of the target area.

The invention can be used in the field of airborne reconnaissance to realize the search and reconnaissance capability of a wide range of target scenes, obtain real-time and accurate detailed detailed information of targeted targets with higher resolution, and improve the high-precision discrimination rate of targets in complex environments.

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a multi-scale wide-field-of-view high-resolution imaging system based on a concentric spherical lens in the prior art;

FIG. 2 is a schematic diagram of the secondary spectrum of FIG. 1 .

FIG. 3 is a schematic structural diagram of a wide-field-of-view high-resolution imaging system based on an apochromatic spherical shell structure provided by an embodiment of the present invention.

Fig. 4 is a schematic structural view of the main objective lens provided by the embodiment of the present invention;

Fig. 5 is the axial aberration curve of the main objective lens provided by the embodiment of the present invention;

Fig. 6 is the main objective lens imaging MTF curve provided by the embodiment of the present invention;

7 is a schematic structural diagram of a wide-field-of-view high-resolution imaging system based on an apochromatic spherical shell structure provided by an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a secondary imaging lens subsystem provided by an embodiment of the present invention;

9 is an imaging MTF curve of an apochromatic spherical shell-type architecture-based wide-field-of-view high-resolution imaging system provided by an embodiment of the present invention;

Fig. 10 is an imaging schematic diagram of a wide-field-of-view high-resolution imaging system based on an apochromatic spherical shell structure provided by an embodiment of the present invention.

Explanation of reference signs:

11-the first spherical lens; 12-the second spherical lens assembly; 121-the first inner lens; 122-the first center lens; 13-the third spherical lens assembly; 131-the second center lens; 132-the second inner lens ; 14-the fourth spherical lens; 15-primary image plane; 16-the first air gap; 17-the second air gap; 18-installation gap; 20-secondary imaging lens subsystem; 21-secondary imaging lens assembly; 22-the first concave lens; 23-the second concave lens; 24-the third plano-convex lens; 25-the fourth concave lens; 26-the fifth double-convex lens; 27-the sixth plano-convex lens; 28-the seventh concave lens;

Detailed ways

The present invention will be described in further detail below in conjunction with specific examples, but the embodiments of the present invention are not limited thereto.

Embodiment one

Please refer to FIG. 3 , a wide-field-of-view high-resolution imaging system based on an apochromatic spherical shell structure, including: a main objective lens and a secondary imaging lens subsystem 20 . The main objective lens includes: a first spherical lens 11 , a second spherical lens assembly 12 , a third spherical lens assembly 13 and a fourth spherical lens 14 arranged concentrically along the optical axis in sequence. The arc surface of the first spherical lens 11 and the arc surface of the second spherical lens assembly 12 are facing the target object, the arc surface of the third spherical lens assembly 13 and the arc surface of the fourth spherical lens 14 are facing the primary image of the main objective lens The surface 15 ; the second spherical lens assembly 12 and the third spherical lens assembly 13 are located in the space enclosed by the first spherical lens 11 and the fourth spherical lens 14 . There is a first air gap 16 between the first spherical lens 11 and the second spherical lens assembly 12, the second spherical lens assembly 12 and the third spherical lens assembly 13 are cemented together, and the third spherical lens assembly 13 and the fourth spherical lens 14 There is a second air gap 17 between them. The first spherical lens 11 , the second spherical lens assembly 12 , the third spherical lens assembly 13 and the fourth spherical lens 14 form an asymmetric structure. In this embodiment, as shown in FIG. 3 , the main objective lens is cut by a longitudinal plane parallel to the optical axis, and the left and right structures of the main objective lens are asymmetrical.

The secondary imaging lens subsystem 20 is located on the side of the primary image surface 15 of the primary objective lens facing away from the primary objective lens. The secondary imaging lens subsystem 20 is mainly used to correct the field curvature aberration of the primary image surface 15 and the secondary imaging lens subsystem The chromatic aberration of 20; the primary image surface 15 is located on the spherical surface concentric with the main objective lens.

In this embodiment, a multi-scale imaging system composed of a main objective lens based on an apochromatic spherical shell structure and a secondary imaging lens subsystem 20 based on a primary image surface 15 is adopted. Among them, apochromat refers to the correction of secondary spectral aberration. Since the primary image surface 15 formed by the concentric main objective lens is a spherical surface concentric with the main objective lens and the imaging of each image point is consistent, it is only necessary to correct the spherical aberration, positional chromatic aberration and the combined aberration of the two in the central field of view, and at the same time The secondary spectral aberration is also corrected to increase the amount of detail information of the target object in the object space.

According to theoretical knowledge of aberrations in optical system design, symmetrical structures can be well corrected for field-dependent aberrations other than field curvature, but axial aberrations such as spherical aberration and second-order spectral aberrations are not. doubled. At this time, the symmetry of the structure is broken, and the secondary spectral aberration can be corrected by using an asymmetric structure, and the concentricity of the structure is preserved. The purpose of the concentricity is to ensure that the imaging quality of the spherical primary image surface 15 formed by each field of view of the main objective lens is consistent and Optical system for wide field of view imaging.

In this embodiment, the main objective lens breaks the symmetry of the concentric symmetrical spherical lens, corrects the spherical aberration, axial chromatic aberration and their combination of the primary image surface 15, and focuses on the correction of the secondary spectral aberration, improving the front The amount of high-frequency information obtained by the secondary primary objective lens on the details of the target object in the object space improves the detail resolution of the target object, and the secondary imaging lens subsystem 20 can correct the field curvature aberration of the primary image surface 15 and its own influence on the resolution The chromatic aberration of the rate further improves the imaging resolution and the recognition accuracy of the target area.

In a feasible implementation, the asymmetric structural correction of spherical aberration is achieved by changing the air gap, the radius of curvature of each spherical lens, the thickness of each spherical lens and/or the glass material, and the appropriate glass material is selected according to the dispersion diagram of the glass Select to correct for secondary spectral aberrations. Specifically, the asymmetric structure of the main objective lens can be realized by changing one or more of the air gap, the curvature radius of each spherical lens, the thickness of each spherical lens, and the glass material.

Further, as shown in FIG. 4 , the second spherical lens assembly 12 includes: a first inner lens 121 and a first central lens 122 . The first inner lens 121 and the first central lens 122 are glued together. The third spherical lens assembly 13 includes: a second central lens 131 and a second inner lens 132 . The second central lens 131 and the second inner lens 132 are cemented together; the first central lens 122 and the second central lens 131 are cemented.

Further, as shown in FIG. 4 , the first spherical lens 11 is a concave lens, and the outer surface and the inner surface of the first spherical lens 11 are arc surfaces. The arc surface of the first spherical lens 11 faces the target object. The first spherical lens 11 is meniscus-shaped. The first inner lens 121 is a concave lens, and the outer surface and the inner surface of the first inner lens 121 are arc surfaces. The arc surface of the first inner lens 121 faces the target object, and the first inner lens 121 may be meniscus-shaped. The arc surface of the first inner lens 121 faces the target object. The first center lens 122 is a convex lens, and the arc surface of the first center lens 122 is located on the arc-shaped inner surface of the first inner lens 121 . The arc surface of the first central lens 122 faces the target object.

The second inner lens 132 is a concave lens, and the outer surface and the inner surface of the second inner lens 132 are arc surfaces. The arc surface of the second inner lens 132 faces the primary image surface 15 , and the second inner lens 132 may be meniscus-shaped. The second center lens 131 is a convex lens, and the arc surface of the second center lens 131 is located on the arc inner surface of the second inner lens 132 . The arc surface of the second central lens 131 faces the primary image surface 15 . The fourth spherical lens 14 is a concave lens, and the outer surface and the inner surface of the fourth spherical lens 14 are arc surfaces. The fourth spherical lens 14 is meniscus-shaped. The arc surface of the fourth spherical lens 14 faces the primary image surface 15 .

In this embodiment, the first spherical lens 11, the first inner lens 121 and the first center lens 122 are hemispheres, the fourth spherical lens 14, the second inner lens 132 and the second center lens 131 are another hemisphere, and the first The spherical lens 11 and the fourth spherical lens 14 are the outermost layer. The outer surface of the second inner lens 132 is a surface facing the first spherical lens 11 , and the inner surface of the second inner lens 132 is facing away from the surface of the first spherical lens 11 . The inner surface of the first spherical lens 11 is parallel to the outer surface of the first inner lens 121 . The outer surface of the second inner lens 132 is a surface facing the fourth spherical lens 14 , and the inner surface of the second inner lens 132 is a surface facing away from the fourth spherical lens 14 . The outer surface of the second inner lens 132 is parallel to the inner surface of the fourth spherical lens 14 .

In this embodiment, the main objective lens adopts a six-piece concentric spherical shell structure, and the concentricity realizes the wide-field imaging of the main objective lens, and breaks the symmetry of the structure and material of the spherical lens to realize spherical aberration, axial chromatic aberration and their combination Aberration correction.

As shown in Figure 5, the apochromatic spherical shell type main objective lens of the present embodiment has completed the correction of secondary spectral aberration at the 0.707 aperture place, and Figure 6 shows the MTF (Modulation Transfer Function, Modulation Transfer Function, of the central field of view of this main objective lens) The modulation transfer function) curve is close to the diffraction limit, indicating that the apochromatic spherical shell-type main objective lens of this embodiment obtains more high-frequency detail information after apochromatization, and the resolution is close to the diffraction limit.

In a feasible implementation manner, the first central lens 122 and the second central lens 131 are both plano-convex lenses, so as to glue them together.

Further, as shown in FIG. 4 , there are installation gaps 18 for installation between the first spherical lens 11 and the fourth spherical lens 14 , and between the first inner lens 121 and the second inner lens 132 .

Further, as shown in FIG. 7 , the primary image plane 15 is the image plane to be imaged by the secondary imaging lens subsystem 20 ; the secondary imaging lens subsystem 20 includes: a plurality of secondary imaging lens assemblies 21 . A plurality of secondary imaging lens assemblies 21 are arranged in an array on a spherical surface concentric with the primary image plane 15 . The peripheral fields of view of two adjacent secondary imaging lens assemblies 21 overlap. In this embodiment, multiple secondary imaging lens assemblies 21 are arranged in sequence. The secondary imaging lens subsystem 20 mainly undertakes two functions: one is to segment and image the primary image plane 15 formed by the front-stage main objective lens with concentric curvature on the respective detectors; Residual aberrations of the objective lens as well as aberrations produced by the correction itself. Due to the concentricity of the main objective lens of the apochromatic spherical shell type, the residual aberration of the primary image plane 15 has the same distribution in each field of view, so each secondary imaging lens assembly 21 is completely consistent, and only one secondary imaging lens assembly 21 needs to be considered The optimization of the design is enough, which greatly reduces the design complexity, processing and assembly costs of the secondary imaging lens subsystem 20 .

In this embodiment, the curvature of the primary image surface 15 is consistent with the curvature of the image surface to be imaged by the secondary imaging lens subsystem 20, which reduces the complexity of the overall design of the system, making it possible to participate in the actual image surface of the secondary imaging lens subsystem 20 It coincides with the primary image plane 15 produced by the main objective lens.

The secondary imaging lens assembly 21 is a PETZVAL (Petzval) architecture. The design of the secondary imaging lens subsystem 20 should focus on correcting the field curvature aberration of the primary image plane 15 and its own chromatic aberration. These two are the key to the quality of the image on the detector target surface, and directly affect the final resolution. high and low. The PETZVAL type optical system can correct the curvature of field well. According to the knowledge of optics, the PETZVAL type optical system has a double glue objective lens at a certain distance, which has a good correction ability for its own chromatic aberration. The PETZVAL type optical system is used as The initial architecture of the secondary imaging system in the wide-field-of-view high-resolution multi-scale imaging system satisfies the design requirements well.

Further, as shown in FIG. 8 , the secondary imaging lens assembly 21 includes: a first concave lens 22, a second concave lens 23, a third plano-convex lens 24, a fourth concave lens 25, a fifth biconvex lens 26, a first Six plano-convex lenses 27 and a seventh concave lens 28. The second concave lens 23 and the third plano-convex lens 24 are cemented together. The fourth concave lens 25 and the fifth biconvex lens 26 are glued together. between the primary image surface 15 and the first concave lens 22, between the first concave lens 22 and the second concave lens 23, between the third plano-convex lens 24 and the fourth concave lens 25, between the fifth double-convex lens 26 and the sixth plano-convex lens 27, between the first There is an air space between the six plano-convex lenses 27 and the seventh concave lens 28 . In this embodiment, the curved surface of the third plano-convex lens 24 and the concave curved surface of the second concave lens 23 are glued together. In this embodiment, the fields of view of the multiple secondary imaging lens assemblies 21 overlap each other, so as to avoid blind spots in the field of view.

The plurality of secondary imaging lens assemblies 21 in this embodiment have the same structure and can be mass-produced. At the same time, each secondary imaging lens assembly 21 works independently of each other and is replaceable when a certain camera fails.

Further, as shown in FIG. 7 , an aperture 29 is provided between the third plano-convex lens 24 and the fourth concave lens 25 . An aperture stop 29 is placed in the secondary imaging lens assembly 21 to make the illumination uniform at each field of view.

As shown in Figure 9, the overall MTF curve of the wide-field-of-view and high-resolution imaging system of the present invention is close to the diffraction limit, indicating that the resolution of the imaging system of the present invention is close to the diffraction limit, and sufficient objects in the object space have been obtained during the imaging process of the entire system. The high-frequency information of the object can realize high-precision resolution and identification of the target area. The system of the present invention can improve the amount of acquisition of high-frequency information details of the target object under complex environmental conditions through the apochromatic design of the front-stage main objective lens, and the array of the secondary imaging lens subsystem 20 ensures the primary image plane of the main objective lens 15. Carry out segmented imaging to obtain consistent image resolution and further improve the interpretation of object space detail information. The system of the present invention acquires more high-frequency information of target objects in the object space during wide-field imaging, improves the detail resolution of the target objects, and can meet the demand for high-precision and accurate identification during wide-field and large-scale area searches.

In a feasible implementation, as shown in FIG. 10 , the primary spherical image surface formed by the main objective lens is divided into a series of sub-images after the secondary imaging lens subsystem 20 array of the Petzval structure is eliminated, and the field curvature aberration is eliminated. The image quality of the sub-images reaches the diffraction limit of the imaging quality of the optical system. The SURF algorithm is used to extract image features, and the sub-images are processed and stitched into a wide-field image, finally realizing wide-field high-resolution imaging.

In a feasible implementation, as shown in Fig. 4, Fig. 8 and Fig. 9, the parameters of the main objective lens and the secondary imaging lens subsystem 20 of the present invention are as shown in Table 1 and Table 2: Table 1 is the lens of the main objective lens Parameters, Table 2 shows the lens parameters of the secondary imaging lens subsystem 20, Surf:type indicates that each surface is numbered from left to right, and the overlapping surfaces are numbered only once. Among them, ob represents the number of the target object. Radius represents the radius of curvature. Thicness represents lens thickness. Wherein, the thickness corresponding to number ① in the table is 39.000 mm, which is the distance between ① and ②, that is, the thickness of the first spherical lens 11, and the thickness corresponding to number ② is the size of the first air gap 16, with And so on. Glass indicates the glass grade of the lens (the grade of Chengdu Guangming Glass), and each grade corresponds to a refractive index and Abbe number. Semi-Diameter means semi-diameter, which is the maximum vertical distance from each surface of the lens to the optical axis.

Unit: mm

Table 1

Unit: mm

Table 2

In practical applications, the size of the air gap, the size of the radius of curvature of each spherical lens, the thickness of each spherical lens and/or the glass material can be changed to meet the imaging requirements.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation indicated by rear, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. The positional relationship is based on the orientation or positional relationship shown in the drawings, which is 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, Therefore, it should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (5)

1. A wide-field high-resolution imaging system based on an apochromatic spherical shell type framework is characterized by comprising a main objective and a secondary imaging lens subsystem (20);

the main objective lens is composed of a first spherical lens (11), a second spherical lens component (12), a third spherical lens component (13) and a fourth spherical lens (14) which are concentrically arranged in sequence along the direction of an optical axis;

the arc surface of the first spherical lens (11) and the arc surface of the second spherical lens component (12) face a target object, and the arc surface of the third spherical lens component (13) and the arc surface of the fourth spherical lens (14) face a primary image surface (15) of the main objective lens; the second spherical lens component (12) and the third spherical lens component (13) are positioned in a space enclosed by the first spherical lens (11) and the fourth spherical lens (14);

-a first air space (16) is provided between the first spherical lens (11) and the second spherical lens component (12), -the second spherical lens component (12) and the third spherical lens component (13) are glued to each other, -a second air space (17) is provided between the third spherical lens component (13) and the fourth spherical lens (14);

the first spherical lens (11), the second spherical lens component (12), the third spherical lens component (13) and the fourth spherical lens (14) form a concentric asymmetric structure;

the secondary imaging lens subsystem (20) is positioned on one side, opposite to the main objective, of the primary image surface (15) of the main objective and used for correcting the field curvature aberration of the primary image surface (15) and the chromatic aberration of the secondary imaging lens subsystem (20); the primary image surface (15) is positioned on a spherical surface concentric with the main objective lens;

wherein, the asymmetric structure correction spherical aberration is realized by changing the air space, the curvature radius of each spherical lens, the thickness of each spherical lens and/or the glass material, and the second-order spectral aberration is corrected by selecting the proper glass material according to the dispersion map of the glass;

the primary image surface (15) is an image surface to be imaged of the secondary imaging lens subsystem (20); the secondary imaging lens subsystem (20) is composed of a plurality of secondary imaging lens assemblies (21);

the plurality of secondary imaging lens assemblies (21) are arranged in an array on a spherical surface concentric with the primary image plane (15);

the marginal fields of view of two adjacent secondary imaging lens assemblies (21) overlap;

the secondary imaging lens assembly (21) is composed of a first concave lens (22), a second concave lens (23), a third plano-convex lens (24), a fourth concave lens (25), a fifth biconvex lens (26), a sixth plano-convex lens (27) and a seventh concave lens (28) which are coaxially arranged in sequence;

the second concave lens (23) and the third plano-convex lens (24) are cemented to each other;

the fourth concave lens (25) and the fifth biconvex lens (26) are cemented to each other;

the second spherical lens assembly (12) is composed of a first inner lens (121) and a first central lens (122);

said first inner lens (121) and said first central lens (122) being cemented to each other;

the third spherical lens component (13) is composed of a second central lens (131) and a second inner lens (132);

said second central lens (131) and said second inner lens (132) being cemented to each other;

the first central lens (122) and the second central lens (131) are cemented.

2. The apochromatic spherical-shell-type-architecture-based wide-field high-resolution imaging system according to claim 1, wherein the first spherical lens (11) is a concave lens, and both the outer surface and the inner surface are arc surfaces;

the first inner lens (121) is a concave lens, and the outer surface and the inner surface of the first inner lens are both arc surfaces;

the first central lens (122) is a convex lens, and the arc surface of the first central lens (122) is positioned on the inner surface of the first inner lens (121);

the second central lens (131) is a convex lens, and the arc surface of the second central lens (131) is positioned on the inner surface of the second inner lens (132);

the second inner lens (132) is a concave lens, and the outer surface and the inner surface of the second inner lens are both arc surfaces;

and the fourth spherical lens (14) is a concave lens, and the outer surface and the inner surface of the fourth spherical lens are both arc surfaces.

3. The apochromatic spherical-shell-architecture-based wide-field high-resolution imaging system according to claim 2, wherein mounting gaps (18) are provided between the first spherical lens (11) and the fourth spherical lens (14) and between the first inner lens (121) and the second inner lens (132) for mounting.

4. The wide-field high-resolution imaging system based on the apochromatic spherical-shell architecture as claimed in claim 1, characterized in that a diaphragm (29) is arranged between the third plano-convex lens (24) and the fourth concave lens (25).

5. The apochromatic ball-and-shell architecture-based wide-field high-resolution imaging system of claim 1, wherein the secondary imaging lens assembly (21) is of PETZVAL architecture.

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