A sealed scanning optical path device based on optical path folding

Abstract

The utility model discloses a kind of sealed scanning optical path devices based on optical path fold, belong to machine vision detection technical field, including light source, reflection component, scanning camera and sealed protection structure;Reflection component contains at least two groups of modularized mirror units, each group is sequentially arranged along optical path to continuously fold the reflected light of to-be-scanned printed matter, shorten device vertical height while guaranteeing optical path length;Sealed protection structure is composed of rack, protective cover and optical glass, protective cover is wrapped reflection component, optical glass is embedded in protective cover light hole, double dust isolation;Light source angle can also be adjusted by fixed plate and rotating shaft, cooperate with fin to guarantee light source stability.The device can adapt to the narrow space of the last printing unit of printing machine, effectively isolate dust foreign matter, reduce optical path interference and maintenance frequency, guarantee printed matter detection precision and device stability.

Description

Technical Field

[0001] This utility model belongs to the field of optical precision instruments, specifically relating to a sealed scanning optical path device based on optical path folding, which is particularly suitable for optical imaging systems in machine vision inspection scenarios. It can achieve stable scanning optical path transmission and protection in confined installation spaces and complex environments such as dust and foreign objects. Background Technology

[0002] The current mainstream scanning optical path device adopts a straight path design where the scanning camera is directly facing the object to be scanned. In order to ensure clear image resolution, the scanning camera needs to maintain a certain distance from the object to be scanned. This results in an excessively large vertical distance between the scanning camera and the object to be scanned (such as a sample placed on a scanning platform). This makes it difficult to adapt to scenarios with limited installation space (such as compact automated inspection equipment and miniaturized product inspection stations) and cannot meet the installation space requirements of different equipment.

[0003] Meanwhile, the core optical components of existing scanning optical path devices (such as reflective lenses and camera photosensitive ends) are mostly in a semi-exposed state, lacking protective designs for complex environments. In complex environments such as industrial sites, foreign objects (such as dust and tiny impurities) can easily enter the optical path, adhere to the surface of the reflective lenses or the camera photosensitive ends, and interfere with the normal reflection and transmission of light, resulting in abnormal imaging effects and affecting the accuracy of the detection results. In addition, exposed optical components also present maintenance challenges: reflective lenses are prone to dust accumulation and require frequent wiping and cleaning, which not only increases the difficulty of maintenance operations but also shortens the maintenance cycle. Frequent maintenance leads to increased equipment downtime, indirectly increasing testing costs.

[0004] In summary, existing scanning optical path devices suffer from core defects such as poor adaptability to confined spaces, susceptibility to interference from foreign objects in complex environments, and high maintenance difficulty and short maintenance cycles. These shortcomings make it difficult to meet the needs of the machine vision inspection field for device space compatibility, environmental adaptability, and low maintenance costs. Therefore, a new scanning optical path solution is urgently needed. Utility Model Content

[0005] In view of this, the present invention aims to overcome the shortcomings of the prior art and provide a sealed scanning optical path device based on optical path folding. The design shortens the vertical distance between the scanning camera and the object to be scanned through optical path folding, adapting to narrow installation spaces and meeting the installation space requirements of different devices. Simultaneously, the sealed structure protects core optical components such as the reflective lens and the camera's photosensitive end, reducing the entry of dust, minute impurities, and other foreign objects into the optical path in complex environments. This prevents abnormal imaging effects caused by interference with light reflection and transmission, ensuring the accuracy of detection results. Furthermore, it reduces the probability of dust accumulation on the reflective lens, minimizing frequent wiping and cleaning operations, reducing maintenance difficulty, extending maintenance cycles, and reducing equipment downtime and testing costs. Ultimately, it achieves a scanning optical path transmission that is highly adaptable to space, has excellent environmental anti-interference capabilities, is easy to maintain, and provides stable imaging.

[0006] To achieve the above objectives, this utility model provides a sealed scanning optical path device based on optical path folding, characterized in that it includes: A light source is used to emit light onto the object to be scanned, causing the object to reflect the light. The reflective assembly includes at least two sets of modular reflector units. Each set of reflector units consists of a reflector lens and a lens fixing component. The lens fixing component is used to fix the reflector lens at a preset angle. Each set of reflector units is arranged sequentially along the transmission path of the reflected light to continuously deflect the reflected light generated by the object to be scanned, change the transmission direction of the reflected light, and shorten the overall vertical height of the device. A scanning camera is installed at the light output end of the reflective component to receive reflected light after it has been continuously refracted by the reflective component, thereby achieving an image of the object to be scanned. A sealed protective structure includes a frame, a protective cover, and optical glass. The frame is used to fix the reflective component. The protective cover is mounted on the frame and completely encloses the reflective component. The protective cover has a light-transmitting hole for reflected light to enter. The optical glass is embedded in the light-transmitting hole. The sealed protective structure isolates foreign objects from the external environment through the protective cover and further blocks foreign objects from entering the interior of the protective cover through the optical glass, while allowing reflected light to pass through, reducing interference from foreign objects on the transmission of reflected light.

[0007] Furthermore, the reflective assembly includes a first reflector unit, a second reflector unit, a third reflector unit, and a fourth reflector unit; the reflector of the first reflector unit faces the object to be scanned, and is used to receive the reflected light generated by the object to be scanned and reflect it to the second reflector unit; the reflector of the second reflector unit receives the light reflected by the first reflector unit and reflects it to the third reflector unit; the reflector of the third reflector unit receives the light reflected by the second reflector unit and reflects it to the fourth reflector unit; the reflector of the fourth reflector unit receives the light reflected by the third reflector unit and reflects it to the scanning camera, forming a continuously refracting optical path.

[0008] Furthermore, the protective cover and the frame are connected by a sealed connection, and the optical glass and the edge of the light-transmitting hole of the protective cover are sealed with sealant to further improve the sealing performance inside the protective cover and reduce the entry of external dust and tiny impurities through gaps.

[0009] Furthermore, the lens fixing components of the first, second, third, and fourth reflector units are all detachably connected to the frame by bolts.

[0010] Furthermore, the light source is a strip light source, and the length direction of the light source is consistent with the width direction of the object to be scanned, so as to form uniform illumination of the object to be scanned and generate uniform intensity reflected light in each area of ​​the object to be scanned.

[0011] Furthermore, it also includes a fixing plate and a rotating shaft, wherein the fixing plate is fixedly connected to the frame or protective cover; Both ends of the strip light source are connected to one end of a rotating shaft, and the other end of each rotating shaft is installed in a mounting hole opened in the fixing plate. The rotating shaft can rotate within the mounting hole to adjust the illumination angle of the strip light source. When the illumination angle of the strip light source is adjusted to the correct position, the rotating shaft and the mounting hole are fixed relative to each other. By rotating and adjusting the shaft, the illumination angle of the bar light source can be changed to adapt to objects of different sizes and surface morphologies, ensuring that the illumination light from the bar light source can cover the scanning area of ​​the object.

[0012] Furthermore, it also includes a heat sink, which is attached to the back of the light source and is used to absorb and dissipate the heat generated when the light source is working.

[0013] Furthermore, the scanning camera has a lens at its light-incident end, and the optical axis of the lens is collinear with the output direction of the reflected light from the last set of mirror units in the reflective assembly.

[0014] The present invention, by adopting the above technical solution, has at least the following beneficial effects: In this invention, the reflective component, through a design of at least two sets of modular reflector units arranged sequentially along the reflected light transmission path, can continuously deflect the reflected light generated by the object to be scanned. While changing the transmission direction of the reflected light, this effectively shortens the overall vertical height of the device. This design specifically solves the problem of poor spatial adaptability in existing straight-path scanning optical path devices, which require a large vertical distance between the scanning camera and the object to be scanned. It can be adapted to compact automated inspection equipment, miniaturized product inspection stations, and other confined installation scenarios, significantly improving the device's spatial compatibility and application range.

[0015] In this invention, the sealed protective structure achieves dual protection through the coordinated operation of the frame, protective cover, and optical glass: the frame provides a stable foundation for the reflective component, the protective cover is mounted on the frame and completely encloses the reflective component, isolating most foreign objects from the external environment; the optical glass is embedded in the light-transmitting hole of the protective cover, allowing reflected light to pass through while further blocking tiny foreign objects from entering the interior of the protective cover. Simultaneously, the sealed connection between the protective cover and the frame, and the sealant sealing between the optical glass and the edge of the light-transmitting hole, further enhance the sealing performance inside the protective cover, reducing the entry of external dust and tiny impurities through gaps. This structure not only prevents foreign objects from adhering to the surface of the reflective lens and interfering with light reflection and transmission, ensuring the accuracy of the test results, but also reduces the probability of dust accumulation on the reflective lens, reducing frequent wiping and cleaning operations, lowering maintenance difficulty, and extending maintenance cycles, indirectly reducing equipment downtime and testing costs.

[0016] In this invention, the light source is a strip light source with its length direction aligned with the width direction of the object to be scanned. This ensures uniform illumination of the object, guaranteeing uniform reflected light intensity across all areas and providing a clear and consistent imaging foundation for the scanning camera. This avoids localized blurring caused by uneven illumination. Furthermore, through the cooperation of the fixing plate and the rotating shaft, the strip light source's illumination angle can be adjusted by rotating the shaft within the mounting hole of the fixing plate. Once the angle is adjusted, the rotating shaft and the mounting hole can be relatively fixed. This allows the device to adapt to objects of different sizes and surface morphologies, ensuring that the strip light source consistently covers the scanning area of ​​the object. This avoids imaging blind spots caused by differences in the object and enhances the device's adaptability to diverse detection needs.

[0017] In this invention, the design of the heat sink being closely connected to the back of the light source can absorb and dissipate the heat generated during the operation of the light source in a timely manner, preventing a decrease in the light emission stability of the light source due to long-term high-temperature operation, ensuring the continuity of the light source's illumination intensity and uniformity, and further ensuring the stability of the reflected light. Simultaneously, the optical axis of the scanning camera's input lens is collinear with the output direction of the reflected light from the last set of reflective mirrors in the reflective assembly. This ensures that the reflected light, after continuous refracting, enters the scanning camera lens completely and without deviation, effectively avoiding imaging misalignment or blurring caused by optical path deviation, improving the accuracy of scanning imaging, and ensuring the reliability of the detection results. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the sealed scanning optical path device of this utility model. Figure 1 ; Figure 2 This is a schematic diagram of the sealed scanning optical path device of this utility model. Figure 2 ; Figure 3 This is a schematic diagram of the internal structure of the sealed scanning optical path device of this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the internal structure of the sealed scanning optical path device of this utility model. Figure 2 ; Figure 5 This is a schematic diagram of the internal structure of the sealed scanning optical path device of this utility model. Figure 3 ; Figure 6 This is a schematic diagram of the optical path transmission of the sealed scanning optical path device of this utility model.

[0020] 1. Light source; 2. Reflection assembly; 21. First reflector unit; 22. Second reflector unit; 23. Third reflector unit; 24. Fourth reflector unit; 3. Lens fixing component; 4. Scanning camera; 5. Frame; 6. Protective cover; 7. Optical glass; 8. Fixing plate; 9. Rotating shaft; 10. Heat sink; 11. Object to be scanned. Detailed Implementation

[0021] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims.

[0022] like Figures 1 to 6 As shown, this embodiment provides a sealed scanning optical path device based on optical path folding, comprising: Light source 1 is used to emit illumination light onto the object to be scanned 11, so that the object to be scanned 11 produces reflected light. The reflective assembly 2 includes at least two sets of modular reflective mirror units. Each set of reflective mirror units consists of a reflective mirror and a mirror fixing member 3. The mirror fixing member 3 is used to fix the reflective mirror at a preset angle. Each set of reflective mirror units is arranged sequentially along the transmission path of the reflected light to continuously deflect the reflected light generated by the object to be scanned 11, change the transmission direction of the reflected light, and shorten the overall vertical height of the device. The scanning camera 4 is located at the light output end of the reflective component 2 and is used to receive the reflected light after it has been continuously refracted by the reflective component 2 to achieve imaging of the object 11 to be scanned; the scanning camera 4 is an industrial line scan camera.

[0023] The sealed protective structure includes a frame 5, a protective cover 6, and optical glass 7. The frame 5 is used to fix the reflective component 2. The frame 5 is made of carbon steel and powder-coated, with a strong corrosion resistance, and can adapt to the complex environment of the industrial site. The protective cover 6 is installed on the frame 5 and completely covers the reflective component 2. The protective cover 6 is made of ABS engineering plastic, which has wear-resistant and impact-resistant properties, and is lightweight and easy to install and disassemble. The protective cover 6 has a light-transmitting hole for the reflected light to enter. The optical glass 7 is made of high-transparency quartz glass, which can reduce the light intensity loss of the reflected light. The optical glass 7 is embedded in the light-transmitting hole. The sealed protective structure isolates foreign objects in the external environment through the protective cover 6 and further blocks foreign objects from entering the interior of the protective cover 6 through the optical glass 7, while allowing the reflected light to pass through, reducing the interference of foreign objects on the transmission of the reflected light.

[0024] In one embodiment, the reflective assembly 2 includes a first reflector unit 21, a second reflector unit 22, a third reflector unit 23, and a fourth reflector unit 24. The reflector of the first reflector unit 21 faces the object to be scanned 11 and is used to receive the reflected light generated by the object to be scanned 11 and reflect it to the second reflector unit 22. The reflector of the second reflector unit 22 receives the light reflected by the first reflector unit 21 and reflects it to the third reflector unit 23. The reflector of the third reflector unit 23 receives the light reflected by the second reflector unit 22 and reflects it to the fourth reflector unit 24. The reflector of the fourth reflector unit 24 receives the light reflected by the third reflector unit 23 and reflects it to the scanning camera 4, forming a continuously refracting optical path. The reflective mirrors of the first reflector unit 21 and the second reflector unit 22 are arranged at a 90° angle, the reflective mirrors of the second reflector unit 22 and the third reflector unit 23 are arranged at a 90° angle, and the reflective mirrors of the third reflector unit 23 and the fourth reflector unit 24 are arranged at a 90° angle. By turning 90° three times, the optical path is arranged in a "Z" shape, which significantly reduces the space occupied by the device in the vertical direction.

[0025] In one embodiment, the protective cover 6 and the frame 5 are connected by a sealed connection, and the optical glass 7 and the edge of the light-transmitting hole of the protective cover 6 are sealed with sealant to further improve the sealing performance inside the protective cover 6 and reduce the entry of external dust and tiny impurities through gaps.

[0026] In one embodiment, the lens fixing parts 3 of the first reflector unit 21, the second reflector unit 22, the third reflector unit 23 and the fourth reflector unit 24 are all detachably connected to the frame 5 by bolts.

[0027] As one implementation method, the light source 1 in this embodiment is a strip light source 1, and the length direction of the light source 1 is consistent with the width direction of the object to be scanned 11, so as to form uniform illumination of the object to be scanned 11 and generate uniform intensity reflected light in each area of ​​the object to be scanned 11.

[0028] As one implementation, this embodiment also includes a fixing plate 8 and a rotating shaft 9, wherein the fixing plate 8 is fixedly connected to the frame 5 or the protective cover 6; Both ends of the strip light source 1 are connected to one end of each of the rotating shafts 9. The other end of each rotating shaft 9 is installed in a mounting hole opened in the fixing plate 8. The rotating shaft 9 can rotate within the mounting hole to adjust the illumination angle of the strip light source 1. The rotating shaft 9 and the mounting hole are fitted with a clearance fit to ensure that the rotating shaft 9 rotates flexibly and to avoid excessive clearance that would cause the rotating shaft 9 to wobble. When the illumination angle of the strip light source 1 is adjusted to the correct position, the rotating shaft 9 is fixed relative to the mounting hole. A threaded hole communicating with the channel is opened on the side of the mounting hole. A set screw is screwed into the threaded hole. By tightening the set screw, the end of the screw is tightly fitted with the outer surface of the rotating shaft 9 to fix the rotating shaft 9. After fixing, the rotating shaft 9 has no axial or radial movement.

[0029] By rotating and adjusting the rotating shaft 9, the illumination angle of the bar light source 1 can be changed to adapt to objects 11 of different sizes and surface morphologies, ensuring that the illumination light from the bar light source 1 can cover the scanning area of ​​the object 11.

[0030] As one implementation, this embodiment also includes a heat sink 10, which is attached to the back of the light source 1 and is used to absorb and dissipate the heat generated by the light source 1 when it is working.

[0031] In one embodiment, the scanning camera 4 has a lens at its light-incident end. The optical axis of the lens is collinear with the output direction of the reflected light from the last set of mirror units in the reflecting assembly 2. The lens is an industrial fixed-focus lens, and its field of view matches the coverage of the reflected light output by the reflecting assembly 2, enabling complete capture of the image of the object to be scanned 11. The lens is connected to the scanning camera 4 via a lens mount, which has a fine-tuning knob. The front and rear positions of the lens can be adjusted by rotating the fine-tuning knob to achieve precise alignment between the lens optical axis and the output direction of the reflected light, ensuring that the image is free from offset and distortion.

[0032] In existing technologies, cameras, lenses, and light sources are mostly installed independently and directly exposed to the external environment. Long-term exposure makes them susceptible to environmental factors, and foreign objects can easily enter the optical path and interfere with imaging, resulting in poor imaging quality and difficulty in ensuring detection accuracy. Especially for printing press production scenarios, existing devices cannot meet the special needs of the last printing unit. This unit has limited installation space and a high dust level in the working environment. Existing devices are either too large to install or lack effective protection, allowing dust to enter the optical path, frequently affecting detection accuracy and equipment lifespan.

[0033] Based on the above problems, the core objective of this embodiment is to design an imaging scheme specifically adapted to the last printing unit of a printing press: During the scanning process, in order to ensure sufficient detection area and clear resolution of the printed matter to be scanned (object to be scanned 11), the scanning camera 4 needs to maintain a certain distance from the printed matter to be scanned. The solution provided in this embodiment can avoid the problem of excessive distance between the scanning camera 4 and the printed matter to be scanned due to this distance, and accurately solve the deployment problem of limited installation space in the last printing unit of the printing press; at the same time, for the harsh working environment with high dust content in this unit, the risk of foreign objects entering the optical path is reduced through special protective design, ensuring stable operation of the device, reducing maintenance difficulty, extending maintenance cycle, and adapting to the continuous production needs of the printing press.

[0034] The specific content and working principle of the solution provided in this embodiment are as follows: The scanning device is installed in the last printing unit of the printing press. In use, the printed material to be scanned output from the last printing unit moves along a preset transmission path within the unit. The light reflected by the printed material under the illumination of the light source 1 is reflected sequentially by the reflective mirrors in the device's reflective component 2 and then transmitted to the scanning camera 4. Under the premise that the path length of the light from the printed material to the scanning camera 4 remains the same, compared with the traditional solution where the scanning camera 4 directly faces the printed material to be scanned, this solution can significantly reduce the vertical height between the scanning camera 4 and the printed material to be scanned through the continuous folding design of the reflective mirrors, compressing the overall volume of the device into the small space that fits the last printing unit of the printing press, and completely solving the core pain point of "insufficient installation space" in this unit.

[0035] The reflective component 2 includes a first reflective lens, a second reflective lens, a third reflective lens, and a fourth reflective lens. The light reflected from the printed material to be scanned is first reflected by the first reflective lens to the second reflective lens, and then reflected by the second reflective lens before being transmitted through the third and fourth reflective lenses in sequence, and finally accurately enters the scanning camera 4. With this technical solution, the image acquired by the scanning camera 4 is consistent with the original image of the printed material to be scanned, without the need for additional image correction or processing, thus ensuring detection efficiency.

[0036] Meanwhile, in response to the harsh environment of the last printing unit of the printing press with high dust levels, the frame 5 of the device is equipped with a fully enclosed protective cover 6. The protective cover 6 tightly wraps the frame 5 and all reflective lenses, with light-passing holes only opened on the path of reflected light transmission. This design can completely isolate the dust inside the unit, prevent the reflective lenses from being directly exposed to the dusty environment and causing dust accumulation, and prevent dust from interfering with the normal reflection and transmission of light. This not only ensures imaging accuracy, but also greatly reduces the frequency of wiping and cleaning operations on the reflective lenses, reduces maintenance difficulty and extends the maintenance cycle, ensuring that the device can operate stably for a long time in the harsh environment of the printing press.

[0037] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sealed scanning optical path device based on optical path folding, characterized in that: include: A light source is used to emit light onto the object to be scanned, causing the object to reflect the light. The reflective assembly includes at least two sets of modular reflector units. Each set of reflector units consists of a reflector lens and a lens fixing component. The lens fixing component is used to fix the reflector lens at a preset angle. Each set of reflector units is arranged sequentially along the transmission path of the reflected light to continuously deflect the reflected light generated by the object to be scanned, change the transmission direction of the reflected light, and shorten the overall vertical height of the device. A scanning camera is installed at the light output end of the reflective component to receive reflected light after it has been continuously refracted by the reflective component, thereby achieving an image of the object to be scanned. A sealed protective structure includes a frame, a protective cover, and optical glass. The frame is used to fix the reflective component. The protective cover is mounted on the frame and completely encloses the reflective component. The protective cover has a light-transmitting hole for reflected light to enter. The optical glass is embedded in the light-transmitting hole. The sealed protective structure isolates foreign objects from the external environment through the protective cover and further blocks foreign objects from entering the interior of the protective cover through the optical glass, while allowing reflected light to pass through, reducing interference from foreign objects on the transmission of reflected light.

2. The sealed scanning optical path device based on optical path folding according to claim 1, characterized in that: The reflective assembly includes a first reflector unit, a second reflector unit, a third reflector unit, and a fourth reflector unit. The reflector of the first reflector unit faces the object to be scanned, and is used to receive the reflected light generated by the object to be scanned and reflect it to the second reflector unit. The reflector of the second reflector unit receives the light reflected by the first reflector unit and reflects it to the third reflector unit. The reflector of the third reflector unit receives the light reflected by the second reflector unit and reflects it to the fourth reflector unit. The reflector of the fourth reflector unit receives the light reflected by the third reflector unit and reflects it to the scanning camera, forming a continuously refracting optical path.

3. The sealed scanning optical path device based on optical path folding according to claim 1, characterized in that: The protective cover and the frame are connected by a sealed connection, and the optical glass and the edge of the light-transmitting hole of the protective cover are sealed with sealant to further improve the sealing performance inside the protective cover and reduce the entry of external dust and tiny impurities through gaps.

4. A sealed scanning optical path device based on optical path folding according to claim 2, characterized in that: The lens fixing components of the first, second, third, and fourth reflector units are all detachably connected to the frame by bolts.

5. A sealed scanning optical path device based on optical path folding according to claim 1, characterized in that: The light source is a strip light source, and the length direction of the light source is consistent with the width direction of the object to be scanned, so as to form uniform illumination of the object to be scanned and generate uniform intensity reflected light in each area of ​​the object to be scanned.

6. A sealed scanning optical path device based on optical path folding according to claim 5, characterized in that: It also includes a fixing plate and a rotating shaft, wherein the fixing plate is fixedly connected to the frame or protective cover; Both ends of the strip light source are connected to one end of a rotating shaft, and the other end of each rotating shaft is installed in a mounting hole opened in the fixing plate. The rotating shaft can rotate within the mounting hole to adjust the illumination angle of the strip light source. When the illumination angle of the strip light source is adjusted to the correct position, the rotating shaft and the mounting hole are fixed relative to each other. By rotating and adjusting the shaft, the illumination angle of the bar light source can be changed to adapt to objects of different sizes and surface morphologies, ensuring that the illumination light from the bar light source can cover the scanning area of ​​the object.

7. A sealed scanning optical path device based on optical path folding according to claim 5, characterized in that: It also includes a heat sink, which is attached to the back of the light source and is used to absorb and dissipate the heat generated when the light source is working.

8. A sealed scanning optical path device based on optical path folding according to any one of claims 1 to 7, characterized in that: The scanning camera is equipped with a lens at its light-incident end, and the optical axis of the lens is collinear with the output direction of the reflected light from the last set of mirror units in the reflective assembly.

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