Optical system and manufacturing method thereof, optical-mechanical structure and manufacturing method thereof

Abstract

The invention relates to an optical system and a manufacturing method thereof, and an optical-mechanical structure and a manufacturing method thereof. The optical system comprises a first reflecting mirror, and the first reflecting mirror comprises a first reflecting surface, a first transition area and a third reflecting surface which are adjacently arranged on the same substrate; a hole is formed in the center of the first reflector and serves as an image surface; the second reflecting mirror and the first reflecting mirror are coaxially arranged, and the second reflecting mirror comprises a second reflecting surface, a second transition area and a fourth reflecting surface which are sequentially and adjacently arranged on the same substrate; the incident region is positioned on the periphery of the second reflecting mirror and is opposite to the first reflecting mirror; light incident to the first reflecting surface through the incident area is reflected for four times between the first reflecting mirror and the second reflecting mirror and reaches the image surface of the first reflecting mirror. The optical path is folded for multiple times, the axial size of the optical system can be shortened, the size of the optical system is reduced, chromatic aberration is avoided, the system structure is easy to install and adjust, and the imaging quality is good.

Description

Technical Field

[0001] The present invention relates to the field of photoelectric detection, and in particular to an optical system and a manufacturing method, an optical-mechanical structure and a manufacturing method. Background Art

[0002] The dual-band common aperture confocal optical system can integrate the recognition features of different bands to achieve all-weather, high-resolution, and target detection in complex environments. In recent years, in the application fields of security monitoring, machine vision, etc., in order to obtain more target information and adapt to more complex environments, the system uses a transition from the infrared band to the visible light band, and at the same time develops towards miniaturization and lightweight.

[0003] In 2007, ERI C et al. proposed an annular optical ultra-thin camera. This optical system has high resolution, small size and high light throughput, and for the first time proposed the concept of annular reflective structure; in 2013, Daniel L. Marks et al. proposed a three-band wide-field catadioptric compact telescope. This system uses multiple reflectors, which greatly reduces the axial size of the system; in 2019, Zhang Bo et al. used optical plastic as the base material and designed an annular folding lens to achieve correction of chromatic aberration. The system works in the visible light band and does not meet the imaging requirements of dual-band; in 2021, Wang Qi et al. designed an annular aperture ultra-thin imaging optical system, which uses a single lens for multiple reflections. It has a simple structure and a compact system, and realizes dual-band imaging of a single-chip annular structure. However, this structure has large chromatic aberration and poor image quality; in 2022, David et al. used the SoCatS structure to design a large-aperture, high-resolution annular folding lens, and proposed the F-GRI N medium to control chromatic aberration and aberration, but this system is difficult to assemble and has poor machinability.

[0004] Current optical systems can hardly meet the requirements of high-quality imaging and small-volume optical systems at the same time. Summary of the invention

[0005] The purpose of the present invention is to propose an optical system and a manufacturing method, an optomechanical structure and a manufacturing method, so as to solve the problem that the optical system is difficult to simultaneously meet the requirements of high-quality imaging and small-volume optical systems.

[0006] The optical system of the present invention comprises:

[0007] A first reflector, the first reflector comprising a first reflective surface, a first transition region, and a third reflective surface adjacently arranged on the same substrate; a hole is provided at a central position of the first reflector and serves as an image plane;

[0008] a second reflector coaxially arranged with the first reflector, the second reflector comprising a second reflective surface, a second transition region and a fourth reflective surface which are arranged adjacent to each other in sequence on the same substrate;

[0009] an incident area, located at the periphery of the second reflector and opposite to the first reflector;

[0010] The light incident toward the first reflective surface through the incident area reaches the image plane at the center of the first reflective mirror after being reflected by the first reflective surface, the second reflective surface, the third reflective surface and the fourth reflective surface in sequence between the first reflective mirror and the second reflective mirror.

[0011] Optionally, the first reflecting surface and the third reflecting surface are even-order aspherical surfaces, and the first transition area is an arc and a platform;

[0012] And / or, the second reflecting surface and the fourth reflecting surface are even-order aspherical surfaces, and the second transition area is an arc.

[0013] Optionally, the material of the first reflector and the second reflector includes microcrystalline glass, and an even-aspherical reflective layer is provided on the microcrystalline glass.

[0014] Optionally, the working band of the optical system includes a visible light band and an infrared band, and the visible light band and the infrared band share a common optical path and focal plane.

[0015] On the other hand, the present invention also provides a method for manufacturing an optical system, comprising:

[0016] providing a first substrate and a second substrate;

[0017] Processing the first substrate into a first reflector, wherein the first reflector comprises a first reflective surface, a first transition region and a third reflective surface that are adjacent to each other; a hole is formed at the center of the first reflector and serves as an image surface;

[0018] Processing the second substrate into a second reflector, wherein the second reflector comprises a second reflective surface, a second transition region and a fourth reflective surface which are arranged adjacent to each other in sequence on the same substrate;

[0019] The first reflector and the second reflector are used to be installed relative to each other. After the first reflector and the second reflector are installed, the periphery of the second reflector serves as an incident area. The light incident toward the first reflective surface through the incident area is reflected by the first reflective surface, the second reflective surface, the third reflective surface and the fourth reflective surface in sequence, and then reaches the image plane at the center of the first reflector.

[0020] On the other hand, the present invention further provides an optomechanical structure, comprising: the above-mentioned optical system and a detector, wherein the detector is arranged corresponding to the image plane formed at the center of the first reflector to receive the light transmitted by the optical system.

[0021] Optionally, the optical-mechanical structure further includes a lens barrel, a double-layer adjustment lens holder, and a detector adapter plate;

[0022] The optical system is installed in the lens barrel, wherein the first reflector is directly fixed in the lens barrel, and the second reflector is fixed to the lens barrel through the double-layer adjustment lens seat;

[0023] The detector is mounted on the detector adapter plate;

[0024] One end of the lens barrel is connected and fixed to the detector adapter plate.

[0025] Optionally, the lens barrel cooperates with an outer edge of the second reflector to form an outer annular aperture, and the incident area is located at the outer annular aperture.

[0026] Optionally, the working band of the detector includes a visible light band and an infrared band.

[0027] On the other hand, the present invention also provides a method for manufacturing an optomechanical structure, comprising:

[0028] Providing the above-mentioned optical system, lens barrel, double-layer adjustment lens holder and detector adapter plate;

[0029] directly fixing the first reflector in the lens barrel;

[0030] The second reflector is fixed in the lens barrel using the double-layer adjustment mirror holder, placed on a six-degree-of-freedom platform, and assembled and adjusted with a robotic arm;

[0031] Placing the detector on the detector adapter plate;

[0032] The lens barrel is connected to the detector adapter plate.

[0033] The optical system of the present invention allows the incident light to be reflected four times between the first reflector and the second reflector and finally reach the image plane, which causes the light path to be folded multiple times, which can shorten the axial dimension of the optical system and reduce the volume of the optical system. The optical system of the present invention integrates four reflective surfaces into two reflectors, reduces the number of optical elements, improves the processability of the optical elements and the difficulty of assembly and adjustment of the optical system as a whole. In addition, the optical system of the present invention reduces the volume through multiple reflections, is not affected by optical materials, basically does not produce chromatic aberration, and has good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the optical path of the optical system of this embodiment;

[0035] Figure 2 is a structural schematic diagram of the optical system of this embodiment;

[0036] Figure 3 is a three-dimensional schematic diagram of the second reflector of this embodiment;

[0037] Figure 4 is a partial cross-sectional schematic diagram of the second reflector of this embodiment;

[0038] Figure 5 is a basic flow chart of the method for manufacturing the optical system of this embodiment;

[0039] Figure 6 is an exploded schematic diagram of the optical-mechanical structure of this embodiment;

[0040] Figure 7 A schematic cross-sectional view of the optomechanical structure of this embodiment;

[0041] Figure 8 is a schematic diagram of the use of the optical-mechanical structure of this embodiment;

[0042] Fig. 9 is a basic flow chart of the method for manufacturing the optomechanical structure of this embodiment;

[0043] Description of reference numerals:

[0044] 10-first reflecting mirror; 11-first reflecting surface; 12-third reflecting surface; 13-first transition region; 14-image plane; 20-second reflecting mirror; 21-second reflecting surface; 22-fourth reflecting surface; 23-second transition region; 30-incident region; 40-detector; 50-lens barrel; 51-double-layer adjustment lens mount; 60-detector adapter plate; 70-external computer equipment; 100-optical-mechanical structure; L-light. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] Embodiment 1:

[0048] In the fields of security monitoring, machine vision, etc., miniaturized optical systems are urgently needed, which are small in size, easy to carry, and can be applied to different working environments. To this end, this embodiment provides an optical system. The optical system of this embodiment folds the axial dimension of the light L between two reflectors from the perspective of reducing the volume and adapting to complex working environments, thereby solving the problem of the large volume and poor environmental adaptability of the optoelectronic system.

[0049] The optical system of this embodiment can be used to reflect the incident light L and make the incident light L arrive at a set position for imaging by the detector 40. The optical system of this embodiment includes but is not limited to the first reflector 10, the second reflector 20 and the incident area 30. The optical system of this embodiment can be a double-piece optical system, that is, only the first reflector 10 and the second reflector 20 are used to complete the reflection of the light.

[0050] The first reflector 10 and the second reflector 20 are coaxially arranged and separated by a certain distance, and the light L incident from the incident area 30 will reach the image plane 13 after multiple reflections between the first reflector 10 and the second reflector 20. In the optical-mechanical structure 100, the detector 40 is arranged at a position corresponding to the image plane 14, and the light L reaching the image plane 13 will be collected by the detector 40 for imaging.

[0051] In this embodiment, the first reflector 10 includes a first reflective surface 11 and a third reflective surface 12, and the first reflective surface 11 and the third reflective surface 12 are arranged adjacent to each other on the same substrate. That is to say, the first reflective surface 11 and the third reflective surface 12 are fitted on the same reflector. It should be understood that the first reflective surface 11 and the third reflective surface 12 are different reflective surfaces, so as to make corresponding adjustments to the transmission optical path of the light L. Specifically, the first reflective surface 11 can reflect the light L incident parallel to the incident area 30 onto the second reflective surface 21, while the third reflective surface 12 reflects the light L reflected by the second reflective surface 21 onto the fourth reflective surface 22. In addition, a first transition area 13 is also included between the first reflective surface 11 and the third reflective surface 12, which makes a smoother transition through the arc and the platform.

[0052] Similarly, the second reflector 20 also includes two reflective surfaces, namely the second reflective surface 21 and the fourth reflective surface 22. The second reflective surface 21 and the fourth reflective surface 22 of the second reflector 20 are also arranged on the same substrate. In addition, a second transition region 23 is also included between the second reflective surface 21 and the fourth reflective surface 22.

[0053] It should be noted that the first transition region 13 and the second transition region 23 in this embodiment are respectively used as transitions between two different reflection surfaces. The first reflection surface 11 and the third reflection surface 13 are different reflection surfaces, the second reflection surface 21 and the fourth reflection surface 22 are different reflection surfaces, and these reflection surfaces are even-order aspheric surfaces. By setting the first transition region 13 and the second transition region 23, a smoother transition between adjacent reflection surfaces is ensured, which is conducive to manufacturing and ensures the quality of formation.

[0054] The incident area 30 is located at the periphery of the second reflector 20 and is opposite to the first reflector 10. It should be noted that the incident area 30 is only a definition of the incident area of ​​the light L. It should be understood that the optical system of the present application has a corresponding area that allows the light L to be incident, which can be any space with or without a solid body. The incident area 30 indicates that the optical system of this embodiment can allow the light L to pass through, and the light L incident from this area will be able to be smoothly reflected in the order of the first reflection surface 11, the second reflection surface 21, the third reflection surface 12 and the fourth reflection surface 22 and reach the image plane 14 at the center of the first reflector 10.

[0055] like Figure 1As shown, the positional relationship of the optical path of the reflective surface is schematically shown. The light L incident toward the first reflective surface 11 through the incident area 30 will reach the image plane 14 at the center of the first reflector 10 after being reflected by the first reflective surface 11, the second reflective surface 21, the third reflective surface 12 and the fourth reflective surface 22 in sequence between the first reflector 10 and the second reflector 20. It can be understood that the optical system of this embodiment allows the incident light L to be reflected four times between the first reflector 10 and the second reflector 20 and finally reach the image plane 14, which causes the optical path to be folded multiple times, which can shorten the axial size of the optical system and reduce the volume of the optical system.

[0056] On the other hand, the existing optical system uses many optical elements and is difficult to assemble and adjust. The above optical system integrates four reflective surfaces into two reflectors, which reduces the number of optical elements, improves the processability of optical elements and the difficulty of assembling and adjusting the entire optical system.

[0057] In addition, the optical system reduces its volume through multiple reflections, is not affected by optical materials, basically does not produce chromatic aberration, and has good imaging quality.

[0058] like Figures 2 to 4 as well as Figure 6 As shown, in some embodiments, the first reflecting surface 11 and the third reflecting surface 12 are even-order aspheric surfaces, the first transition area 13 is an arc and a platform, and / or, the second reflecting surface 21 and the fourth reflecting surface 22 are even-order aspheric surfaces, and the second transition area 23 is an arc. That is, the aspheric surfaces are transitioned through a certain arc or an arc and a platform, which makes it easier to form two different aspheric surfaces on the same reflector, and the quality of the formed surface is higher. In practical applications, the specific widths of the first transition area 13 and the second transition area 23 can be set according to the curvature of each reflecting surface and the requirements of the light path reflection, and the transition is as smooth as possible while ensuring that the light path can be reflected normally. In some other implementation processes, the transition area can also be other shapes.

[0059] In order to fit different reflective surfaces onto the same substrate, multiple surfaces can be formed on the same substrate by coating an aspheric surface on an aspheric surface. The surface of the substrate is made into multiple different curved surfaces and / or planes, and a gold reflective film is coated on the surface to form a reflector with more than one reflective surface.

[0060] In this embodiment, the substrate used may be a microcrystalline glass substrate, and an aspherical reflective layer is arranged on its highly polished surface to achieve reflection. That is, the first reflector 10 and the second reflector 20 include a microcrystalline glass substrate and an aspherical fitting reflective layer arranged on the surface of the microcrystalline glass substrate.

[0061] In order to improve the imaging and recognition effects, the optical system of this embodiment can be configured for non-single bands. In this embodiment, the working bands of the optical system include visible light bands and infrared bands, and the visible light and infrared dual bands share the same optical path and the same image plane 14. In other words, both the visible light band and the infrared band can reach the image plane 14 at the center of the first reflector 10 after being injected into the optical system of this embodiment. The optical system with dual working bands can fuse the recognition features of different bands, so that the functions of different bands complement each other, share information, and improve the target recognition capability, thereby effectively improving the accuracy of detecting and identifying targets, so as to achieve all-weather, high-resolution, and complex environment target detection. In addition, through the optical system of this embodiment, the reflections of the dual bands are integrated and integrated, achieving the effect of common collection surface and integration, which is conducive to reducing the volume.

[0062] The process design of the dual-band common aperture confocal optical system ensures the system's performance indicators and environmental adaptability in practical applications. The multiple reflection design also makes the visible light / long-wave infrared common aperture confocal optical system smaller and lighter.

[0063] Corresponding to the optical system illustrated in this embodiment, this embodiment also provides a method for manufacturing the optical system, see Figure 5 As shown, it includes but is not limited to the steps of:

[0064] S101, providing a first substrate and a second substrate;

[0065] The first substrate and the second substrate may be made of microcrystalline glass. In some embodiments, the materials of the first substrate and the second substrate may be the same, and in some embodiments, they may be different, for example, one is made of microcrystalline glass and the other is made of other materials.

[0066] S102, processing the first substrate into a first reflector, wherein the first reflector includes a first reflective surface, a second transition region, and a third reflective surface that are adjacent to each other; a hole is formed at the center of the first reflector as an image surface;

[0067] Specifically, a small-diameter aspheric grinding tool can be used for processing to process the surface of the first substrate into the desired shape of the first reflector 10. In addition, a proper volume is dug out from the center of the first substrate to form a hole, which serves as the image plane 14 in the optical system of this embodiment and is used to match the detector 40, so that the detector 40 can be placed at the image plane 14 to collect the light L.

[0068] S103, processing the second substrate into a second reflector, where the second reflector includes a second reflective surface, a transition region, and a fourth reflective surface that are sequentially adjacent to each other on the same substrate;

[0069] It should be understood that, in the absence of conflict, the execution order of the above steps S102 and S103 in this embodiment is not limited, as long as the two reflectors are manufactured according to the structure described above.

[0070] The second substrate can be processed by using a small-diameter aspheric grinding tool. In order to ensure a smooth transition between adjacent reflective surfaces, an arc transition form can be selected, or a transition form of an arc and a platform can be used for reflective surface fitting.

[0071] In this embodiment, the first reflector 10 and the second reflector 20 are used for relative installation. After the first reflector 10 and the second reflector 20 are installed, the periphery of the second reflector 20 is used as the incident area 30; the light L incident toward the first reflective surface 11 through the incident area 30 is reflected by the first reflective surface 11, the second reflective surface 21, the third reflective surface 12 and the fourth reflective surface 22 in sequence, and then reaches the image plane 14 at the center of the first reflector 10. It should be understood that the first reflector 10 and the second reflector 20 can be separated, that is, they do not contact each other, and the installation of the two is only relative in position, so that the light L can be reflected according to the expected reflection order and route. The optical system is manufactured by the above method, so that adjacent reflective surfaces are fitted in one reflector, and in the manufacturing process, the number of optical elements involved is reduced, and the efficiency and difficulty of manufacturing are lower.

[0072] After the optical system is manufactured, it can be subjected to tests such as vibration shock, salt spray test, high and low temperature test, etc. In some implementation processes, the optical system of this embodiment can achieve MTF (Modulation Transfer Function) ≥ 0.4, and the measured imaging quality is good, and it has good environmental adaptability.

[0073] This embodiment further provides an optomechanical structure 100, which includes the optical system of the above example and a detector 40. The detector 40 is arranged corresponding to the image plane 14 formed at the center of the first reflector 10 to receive the light L transmitted by the optical system.

[0074] After the optical system reflects the incident light L multiple times, it can accurately reach the detector 40. The optical structure of the optical system of this embodiment is not affected by the optical material and basically does not produce chromatic aberration, so that the imaging quality of the detector 40 is good. In addition, the optical structure of this embodiment reduces the axial size and volume, so that the overall size and volume of the optical system can also be reduced.

[0075] In order to stably install the optical system and the detector 40, in some embodiments, the optical-mechanical structure 100 further includes a lens barrel 50 and a detector adapter plate 60. The lens barrel 50 and the detector adapter plate 60 may be equivalent to the outer shell of the optical-mechanical structure 100, and of course other housing structures may also be included in practical applications.

[0076] like Figure 6 As shown, the first reflector 10 can be first fixed to the detector adapter plate 60 and then installed in the lens barrel 50 along with the installation of the detector adapter plate 60; the second reflector 20 can be installed in the lens barrel 50 through installation structures such as a double-layer adjustment lens seat 51. In practical applications, the specific installation form of the two reflectors is not limited.

[0077] like Figure 7 As shown, the optical system is installed in the lens barrel 50, and the two ends of the lens barrel 50 have holes for light L to pass through. Among them, the hole at one end of the lens barrel 50 corresponds to the incident area 30 of the optical system, allowing the light L to enter; the hole at the other end of the lens barrel 50 corresponds to one side of the detector 40, and after the first reflector 10 is installed, its image surface 14 faces the detector 40. The detector adapter plate 60 has the same hole position as the lens barrel 50, so that the detector adapter plate 60 is connected to the lens barrel 50, and the optical system is opposite to the detector 40 for subsequent imaging.

[0078] In this embodiment, the lens barrel 50 cooperates with the outer edge of the second reflector 20 to form an outer annular aperture, and the incident area 30 is located at the outer annular aperture.

[0079] like Figure 8 As shown, when in use, the optical system is connected to the detector 40 through the detector adapter plate 60, and the detector 40 is connected to the external computer device 70 for imaging through the detector interface. Light L can be incident from the outer annular aperture, reflected four times between the first reflector 10 and the second reflector 20, and finally arrive at the detector 40. The optical system only uses reflection as the propagation mode of light L, and finally focuses on the detector 40 to obtain the detection image.

[0080] In some implementations of this embodiment, the working band of the detector 40 includes a visible light band and an infrared band. The detector 40 in this embodiment includes but is not limited to various devices capable of imaging light L in the visible light band and / or the infrared band. The dual-working band detector 40 can identify information in two different bands, improve the target recognition capability, and thus effectively improve the accuracy of detecting and identifying targets, so as to achieve all-weather, high-resolution, and complex environment target detection.

[0081] This embodiment also provides a method for manufacturing the optomechanical structure 100, see Fig. 9 ,include:

[0082] S201, provide an optical system, a lens barrel, a double-layer adjustment lens mount and a detector adapter plate;

[0083] The optical system provided is the optical system of the aforementioned example of this embodiment.

[0084] S202, directly fixing the first reflecting mirror in the lens barrel;

[0085] S203, use a double-layer adjustment mirror holder to fix the second reflector in the mirror barrel, place it on a six-degree-of-freedom platform, and use a robotic arm to assemble and adjust it.

[0086] S204, placing the detector on the detector adapter plate;

[0087] S205, connecting the lens barrel to the detector adapter plate;

[0088] After the lens barrel 50 is connected to the detector adapter plate 60, the image plane 14 of the first reflector 10 is aligned with the position of the detector 40, so that the light L will be reflected onto the detector 40. It should be understood that, in the absence of conflict, the execution order of the above steps S204 and S205 in this embodiment is not limited.

[0089] The manufacturing method of the above optical-mechanical structure 100 adopts the optical system of the above example, the system uses a small number of optical elements and is easy to assemble. In addition, the first reflector 10 is fixed in the lens barrel 50, and the second reflector 20 is adjusted by a six-degree-of-freedom method with a mechanical arm, which can reduce the difficulty of adjusting the optical system and realize the engineering of the optical system.

[0090] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present disclosure that are equivalent, modified, omitted, combined (e.g., various embodiments intersecting), adapted or changed. It is not limited to the examples described in this specification or during the implementation of the present invention, and its examples will be interpreted as non-exclusive.

[0091] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, those of ordinary skill in the art may use other embodiments when reading the above description.

[0092] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical system, characterized in that: include: A first reflector, the first reflector comprising a first reflective surface, a first transition region, and a third reflective surface adjacently disposed on the same substrate; The center position of the first reflector has a hole and serves as an image plane; a second reflector coaxially arranged with the first reflector, the second reflector comprising a second reflective surface, a second transition region and a fourth reflective surface which are arranged adjacent to each other in sequence on the same substrate; an incident area, located at the periphery of the second reflector and opposite to the first reflector; The light incident toward the first reflective surface through the incident area reaches the image plane at the center of the first reflective mirror after being reflected by the first reflective surface, the second reflective surface, the third reflective surface and the fourth reflective surface in sequence between the first reflective mirror and the second reflective mirror.

2. The optical system according to claim 1, wherein: The first reflecting surface and the third reflecting surface are even-order aspherical surfaces, and the first transition area is an arc and a platform; And / or, the second reflecting surface and the fourth reflecting surface are even-order aspherical surfaces, and the second transition area is an arc.

3. The optical system according to claim 1, wherein: The material of the first reflector and the second reflector includes microcrystalline glass, and an even-aspherical reflective layer is arranged on the microcrystalline glass.

4. The optical system according to claim 1, wherein: The working band of the optical system includes a visible light band and an infrared band, and the visible light band and the infrared band share a common optical path and a focal plane.

5. A method for manufacturing an optical system, characterized in that: include: providing a first substrate and a second substrate; Processing the first substrate into a first reflector, wherein the first reflector comprises a first reflective surface, a first transition region and a third reflective surface that are adjacent to each other; a hole is formed at the center of the first reflector and serves as an image surface; Processing the second substrate into a second reflector, wherein the second reflector comprises a second reflective surface, a second transition region and a fourth reflective surface which are arranged adjacent to each other in sequence on the same substrate; The first reflector and the second reflector are used to be installed relative to each other. After the first reflector and the second reflector are installed, the periphery of the second reflector serves as an incident area. The light incident toward the first reflective surface through the incident area is reflected by the first reflective surface, the second reflective surface, the third reflective surface and the fourth reflective surface in sequence, and then reaches the image plane at the center of the first reflector.

6. An optomechanical structure, characterized in that: include: The optical system and detector according to any one of claims 1 to 4, wherein the detector is arranged corresponding to the image plane formed at the center of the first reflector to receive the light propagated by the optical system.

7. The optomechanical structure according to claim 6, wherein: The optical-mechanical structure also includes a lens barrel, a double-layer adjustment lens holder and a detector adapter plate; The optical system is installed in the lens barrel, wherein the first reflector is directly fixed in the lens barrel, and the second reflector is fixed to the lens barrel through the double-layer adjustment lens seat; The detector is mounted on the detector adapter plate; One end of the lens barrel is connected and fixed to the detector adapter plate.

8. The optomechanical structure according to claim 7, wherein: The lens barrel cooperates with the outer edge of the second reflector to form an outer annular aperture, and the incident area is located at the outer annular aperture.

9. The optomechanical structure according to claim 6, wherein: The working waveband of the detector includes the visible light waveband and the infrared waveband.

10. A method for manufacturing an optomechanical structure, characterized in that: include: Provide the optical system, lens barrel, double-layer adjustment lens holder and detector adapter plate according to any one of claims 1 to 4; directly fixing the first reflector in the lens barrel; The second reflector is fixed in the lens barrel using the double-layer adjustment mirror holder, placed on a six-degree-of-freedom platform, and assembled and adjusted with a robotic arm; Placing the detector on the detector adapter plate; The lens barrel is connected to the detector adapter plate.

Images