Track physical evidence photographing device

Abstract

According to the trace material evidence photographing device provided by the invention, the imaging size does not change along with the change of the photographing distance, an electronic scale does not need to be calibrated repeatedly during use, potential material evidences on an object are prevented from being polluted or damaged, and the field investigation trace material evidence photographing work is more convenient, efficient and safe; the camera part of the built-in camera equipment in adaptive connection comprises a camera lens and a photosensitive element, the trace material evidence photographing device comprises a box body, a material detection hole and a photographing hole are formed in the box body, and an imaging objective lens arranged on an imaging light path between the material detection hole and the photographing hole is arranged in the box body; the camera lens, the photographing hole, the imaging objective lens, the material detection hole and the optical axis of the imaging light path are coaxially arranged, and the camera lens is located on the focus of the imaging objective lens, so that a trace material evidence located below the material detection hole is imaged on the photosensitive element.

Description

Technical Field

[0001] The present invention relates to the field of forensic science technology, and particularly to a photographic device for trace physical evidence. Background Art

[0002] When trace physical evidence such as fingerprints and biological specimens are found during the on-site investigation of criminal cases, in order to truly reflect the shape, position and size of the trace physical evidence, it is necessary to place a scale beside the trace physical evidence and then take a photo with a professional camera for fixation.

[0003] With the continuous increase in the effective pixels of the photosensitive elements of built-in camera devices such as smartphones or tablets and the continuous improvement of lens performance, the built-in camera devices can also replace professional cameras for taking photos of trace physical evidence. By developing special photographic software for the built-in camera devices, an electronic scale can be synthesized on the photo, and the beneficial effects are: it can not only replace the physical scale, but also avoid contaminating or damaging potential physical evidence that may exist at the scale placement position due to the placement of the physical scale.

[0004] Generally speaking, the closer the camera is to the object, the larger the image of the object on the photosensitive element of the camera; the farther the camera is from the object, the smaller the image of the object on the photosensitive element of the camera. The photographing distance refers to the distance between the camera or photographic device and the trace physical evidence during on-site investigation photography; when the magnification of the camera remains unchanged, the shorter the photographing distance, the larger the image of the trace physical evidence on the camera screen; the longer the photographing distance, the smaller the image of the trace physical evidence on the camera screen. Before taking a photo with a built-in camera device with an electronic scale photographic software, a physical scale is usually placed at a fixed photographing distance first for calibration of the electronic scale, and then the trace physical evidence is photographed and fixed at the same photographing distance. Finally, the electronic scale is synthesized on the photo. If the photographing distance changes, the imaging size of the trace physical evidence on the photosensitive element of the camera will also change. At this time, if an electronic scale is needed, the electronic scale must be recalibrated at the new photographing distance, and the trace physical evidence must be photographed again while keeping the photographing distance unchanged, which is very inconvenient to use.

[0005] To avoid the cumbersome work of repeatedly calibrating the electronic scale, after calibrating the electronic scale at a certain photographing distance, if the photographing distance remains the same when photographing trace evidence, there is no need to calibrate the electronic scale. Currently, the simplest and most effective method is to mount the built-in camera device on a photographing device and let the photographing device be in close contact with the physical scale for calibrating the electronic scale, that is, to set the photographing distance to 0. Then, keep photographing in close contact with the trace evidence all the time, which means keeping the photographing distance at 0 all the time. In this way, the electronic scale does not need to be calibrated. The method of letting the photographing device be in close contact with the trace evidence for photographing can solve the problem of not needing to repeatedly calibrate the electronic scale, but it also brings two drawbacks: First, when photographing in close contact with the trace evidence, the photographing device will more or less come into contact with the carrier object of the trace evidence, which may contaminate or damage the potential evidence at the contact area of the object. Second, it is impossible to take close-up photos of the trace evidence in some parts. For example, for the fingerprints on the glass near the window frame, due to the obstruction of the window frame with a certain thickness, the photographing device cannot be in close contact with the glass for photographing.

[0006] Therefore, inventing a photographing device for trace evidence whose imaging size does not change with the photographing distance, which does not need to calibrate the electronic scale during use and can achieve non-contact photographing to avoid contamination or damage to potential evidence, makes the photographing and fixing work of trace evidence in on-site investigation more convenient, efficient and safe, and has very important significance for the photographing and fixing work of trace evidence at the crime scene. Summary of the Invention

[0007] In view of the above problems, the present invention provides a photographing device for trace evidence, which can achieve that the imaging size does not change with the photographing distance, does not need to repeatedly calibrate the electronic scale during use, and can avoid contaminating or damaging the potential evidence on the object, making the photographing work of trace evidence in on-site investigation more convenient, efficient and safe.

[0008] The technical solution of the present invention is as follows: A photographing device for trace evidence is adaptively connected to a built-in camera device. The camera part of the built-in camera device includes a camera lens and a photosensitive element. The photographing device for trace evidence includes a box body, and a sample hole and a photographing hole are provided on the box body. It is characterized in that: An imaging objective lens is installed in the box body on the imaging optical path between the sample hole and the photographing hole; The camera lens, the photographing hole, the imaging objective lens, the sample hole and the optical axis of the imaging optical path are coaxially arranged, and the camera lens is located at the focus of the imaging objective lens, so that the trace evidence located below the sample hole forms an image on the photosensitive element, and satisfies: The ratio of the optical imaging length of the trace evidence to the length of the trace evidence is equal to the ratio of the distance between the camera lens and the photosensitive element to the focal length of the imaging objective lens.

[0009] Further, the built-in camera device is placed at the top of the box body, the photographic hole is placed at the top of the box body, and the sample inspection hole is placed at the bottom of the box body;

[0010] Further, the imaging objective lens is located directly above the sample inspection hole, and the photographic hole is located directly above the imaging objective lens;

[0011] Further, the trace physical evidence forms an image on the photosensitive element, and satisfies: the ratio of the optical imaging length of the trace physical evidence to the length of the trace physical evidence is equal to the ratio of the distance between the camera lens and the photosensitive element to the focal length of the imaging objective lens;

[0012] Further, a reflecting component is arranged on the imaging optical path in the box body. The reflecting component includes a first reflecting mirror and a second reflecting mirror. The imaging objective lens is arranged on the imaging optical path between the first reflecting mirror and the second reflecting mirror. The first reflecting mirror is located directly above the sample inspection hole, and the second reflecting mirror is located directly below the photographic hole;

[0013] Further, the first reflecting mirror forms an angle of 45° with the horizontal plane to reflect the optical axis of the imaging optical path entering the box body through the sample inspection hole into the imaging objective lens in the horizontal direction; the second reflecting mirror forms an angle of 135° with the horizontal plane to reflect the optical axis of the imaging optical path in the horizontal direction into the photographic hole in the vertically upward direction.

[0014] The beneficial effect of the present invention is that by setting the camera lens at the focus of the imaging objective lens, the purpose of keeping the optical magnification (the ratio of the lateral dimensions of the image to the object) unchanged with the change of the photographing distance is achieved. The on-site investigation personnel can not only take photos of the trace physical evidence at the crime scene at different photographing distances, but also keep the imaging size of the trace physical evidence on the camera unchanged. Thus, the problem that the electronic scale needs to be recalibrated once the photographing distance changes when using the electronic scale to replace the physical scale for photographing in the past is solved. It is realized that the on-site investigation personnel not only do not need to calibrate the electronic scale, but also can avoid polluting or damaging the potential physical evidence on the object, making the photographing work of the trace physical evidence in on-site investigation more convenient, efficient and safe. Description of the Drawings

[0015] Figure 1 is the structural schematic diagram of the first embodiment of the present invention;

[0016] Figure 2 is Figure 1 the imaging schematic diagram of the trace physical evidence;

[0017] Figure 3 is the structural schematic diagram of the second embodiment of the present invention;

[0018] Figure 4 is Figure 3Schematic diagram of imaging of trace evidence;

[0019] Figure 5 It is the schematic diagram of secondary reflection imaging principle of the second embodiment of the present invention;

[0020] Figure 6 It is the imaging principle diagram when the photographing distance PD in the first embodiment and the second embodiment is relatively short;

[0021] Figure 7 It is the imaging principle diagram when the photographing distance PD in the first embodiment and the second embodiment is relatively long;

[0022] Figure 8 It is the photo of the physical scale taken by the present invention when the photographing distance PD = 0 cm and the electronic scale is synthesized;

[0023] Figure 9 It is the photo of the physical scale taken by the present invention when the photographing distance PD = 12 cm and the electronic scale is synthesized.

[0024] Figures 1 to 9 In the figure: 1. Box body; 2. Photographing hole; 3. Specimen hole; 4. Imaging objective lens; 5. Camera lens; 6. Photosensitive element; 7. Built-in camera device; 8. Object; 9. Trace evidence; 10. First reflector; 11. Second reflector; 12. Imaging light; 13. Optical axis of imaging optical path. Detailed implementation manners

[0025] Next, the technical solutions and beneficial effects of the embodiments of the present invention will be described in detail with reference to the accompanying drawings. The described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] First embodiment

[0027] As Figure 1 、 Figure 2As shown in the figure, a photographic device for trace evidence of the present invention is adaptively connected to an internal camera device 7. The camera part of the internal camera device 7 includes a camera lens 5 and a photosensitive element 6. The photographic device for trace evidence includes a box body 1. A specimen hole 3 and a photographic hole 2 are provided on the box body 1. An imaging objective lens 4 is installed in the box body 1 on the imaging optical path between the specimen hole 3 and the photographic hole 2; the camera lens 5, the photographic hole 2, the imaging objective lens 4, the specimen hole 3 and the optical axis 13 of the imaging optical path are coaxially arranged, and the camera lens 5 is located at the focus of the imaging objective lens 4, so that the trace evidence 9 located below the specimen hole 3 is imaged on the photosensitive element 6, and it satisfies: the ratio of the optical imaging length h2 of the trace evidence 9 to the length h1 of the trace evidence 9 is equal to the ratio of the distance length u between the camera lens 5 and the photosensitive element 6 to the focal length f of the imaging objective lens 4, that is, h2÷h1 = u÷f.

[0028] The internal camera device 7 is placed at the top of the box body 1, the photographic hole 2 is placed at the top of the box body 1, and the specimen hole 3 is placed at the bottom of the box body 1; the imaging objective lens 4 is located directly above the specimen hole 3, and the photographic hole 2 is located directly above the imaging objective lens 4; the trace evidence 9 is attached to the object 8, and the specimen hole 3 is located directly above the object 8.

[0029] The working principle of the first embodiment of the present invention is: as Figure 2 shown, the trace evidence 9 attached to the object 8 is represented by an arrow, and the bottom of the arrow is located on the optical axis 13 of the imaging optical path. The arrow will emit light under the illumination of a light source (not shown in the figure) and be imaged through the photographic device for trace evidence; specifically, taking the imaging of the top of the arrow as an example, many light rays (not shown in the figure) are emitted from the top of the arrow (that is, the trace evidence 9). Among them, some of the light rays that reach and pass through the imaging objective lens 4 start to converge towards the camera lens 5. The light rays that reach and pass through the camera lens 5 finally converge into a point on the photosensitive element 6 for imaging; subsequently, taking one of the many light rays emitted from the top of the arrow as an example, the imaging light ray 12 parallel to the optical axis 13 of the imaging optical path enters the box body 1 through the specimen hole 3. The imaging light ray 12 changes its direction after being refracted by the imaging objective lens 4, so that the imaging light ray 12 is no longer parallel to the optical axis 13 of the imaging optical path, but travels straight towards the focus direction of the imaging objective lens 4. The camera lens 5 and the photographic hole 2 are both coaxially arranged with the optical axis 13 of the imaging optical path, and the camera lens 5 is located at the focus of the imaging objective lens 4. Therefore, the imaging light ray 12 traveling straight towards the focus direction of the imaging objective lens 4 does not refract when passing through the center point of the camera lens 5, and still travels straight and is imaged on the photosensitive element 6.

[0030] As Figure 2 、 Figure 6 、 Figure 7 shown, the optical principle of the present invention is:

[0031] The distance between the trace evidence 9 and the specimen hole 3 at the bottom of the box body 1 is PD, that is, the photographing distance;

[0032] The distance between the imaging objective lens 4 and the camera lens 5 is denoted as f, which is also the focal length of the imaging objective lens 4 and is a constant;

[0033] The distance between the camera lens 5 and the photosensitive element 6 is denoted as u and is a constant;

[0034] The intersection point of the imaging objective lens 4 and the imaging light ray 12 is denoted as A;

[0035] The intersection point of the imaging objective lens 4 and the optical axis 13 of the imaging optical path is denoted as B;

[0036] The intersection point of the camera lens 5 and the optical axis 13 of the imaging optical path is denoted as O;

[0037] The intersection point of the photosensitive element 6 and the imaging light ray 12 is denoted as C;

[0038] The intersection point of the photosensitive element 6 and the optical axis 13 of the imaging optical path is denoted as D;

[0039] Since the camera lens 5 is located at the focus of the imaging objective lens 4, the intersection point O overlaps with the focus of the imaging objective lens 4, that is, the length of BO is equal to f;

[0040] The distance from the optical axis 13 of the imaging optical path to the top of the arrow of the trace evidence 9 is denoted as h1, which is also the length of the arrow of the trace evidence 9 and represents the lateral dimension of the object;

[0041] The distance from the optical axis 13 of the imaging optical path on the photosensitive element 6 to the top of the arrow is denoted as h2, which is also the length of the arrow image and represents the lateral dimension of the image;

[0042] Specifically, the trace evidence 9 is represented by an arrow. The bottom of the arrow is located on the optical axis 13 of the imaging optical path. The top of the arrow emits many light rays under the illumination of a light source (not shown in the figure). Taking one of the imaging light rays 12 as an example, this imaging light ray 12 is parallel to the optical axis 13 of the imaging optical path. According to the basic optical principle that parallel light passes through a convex lens and converges to the focus, the imaging light ray 12 that enters the box 1 through the inspection hole 3 undergoes refraction after passing through the intersection point A and travels straight along the AO direction. Since the intersection point O is both the focus of the imaging objective lens 4 and the center point of the camera lens 5, according to another basic optical principle that light rays will pass straight through the center point of the lens, the imaging light ray 12 continues to travel straight in the original direction after passing through the intersection point O until it reaches the intersection point C, that is, the length h2 of the arrow image is formed; Whether it is based on the imaging principle in the case of a short photographing distance PD as shown in Figure 6 or according to the imaging principle in the case of a short photographing distance PD as shown in Figure 7The imaging principle in the case of a relatively long photographing distance PD as shown. All the imaging light rays 12 emitted by the trace evidence 9 have to pass through the intersection point A. That is to say, the length of AB is always equal to the arrow length h1 and does not change with the change of the photographing distance PD. The camera lens 5 is located at the focus of the imaging objective lens 4, so that the distance between the camera lens 5 and the imaging objective lens 4 is equal to the focal length f of the imaging objective lens. After determining a certain model of imaging objective lens according to the situation, the focal length f is a fixed value. And since the camera lens 5 and the photographic aperture 2 are both coaxially arranged with the optical axis of the imaging light path, then Figure 6 BOD in it is a straight line. The light ray AO does not refract after passing through point O and still propagates in a straight line direction until the intersection point C. Then AOC is also a straight line. Therefore, according to ∠AOB = ∠COD and ∠ABO = ∠CDO = 90°, △AOB and △COD have two identical angles, and the third angle must also be the same. So △AOB and △COD are similar triangles. CD÷AB = OD÷OB. So h2÷h1 = u÷f. Among them, the focal length f and the distance u are both fixed constants, so the value of h2÷h1 is also a fixed constant, that is, the optical magnification (the horizontal size ratio of the image to the object) is a fixed constant. Then no matter how the photographing distance PD between the bottom of the box body 1 and the trace evidence 9 changes, the imaging size of the trace evidence 9 always remains unchanged.

[0043] Embodiment 2

[0044] As Figure 3 shown, the difference between Embodiment 2 and Embodiment 1 of the present invention is that: a reflective optical device is provided in the imaging light path in the box body 1. Specifically, a reflective component is provided on the imaging light path in the box body 1. The reflective component includes a first reflector 10 and a second reflector 11. The imaging objective lens 4 is arranged on the imaging light path between the first reflector 10 and the second reflector 11. The first reflector 10 is located directly above the specimen hole 3, and the second reflector 11 is located directly below the photographic aperture 2; the first reflector 10 forms an angle of 45° with the horizontal plane to reflect the vertically upward optical axis 13 of the imaging light path entering the box body 1 through the specimen hole 3 into the imaging objective lens 4 in a horizontal direction; the second reflector 11 forms an angle of 135° with the horizontal plane to reflect the horizontal optical axis 13 of the imaging light path into the photographic aperture 2 in a vertically upward direction.

[0045] The working principle of Embodiment 2 of the present invention is: As Figure 4As shown, the specimen hole 3 is located directly above the object 8, and the trace evidence 9 attached to the object 8 is indicated by an arrow. The bottom of the arrow is located on the optical axis 13 of the imaging optical path. The arrow will emit light under the illumination of a light source (not shown in the figure) and be imaged by the trace evidence photographing device. Specifically, taking the imaging of the arrow tip as an example, many light rays (not shown in the figure) are emitted from the tip of the arrow (i.e., the trace evidence 9). Among them, the light rays that are reflected by the first mirror 10 and reach and pass through the imaging objective lens 4, a part of them are reflected by the second mirror 11 and converge towards the camera lens 5. The light rays that reach and pass through the camera lens 5 finally converge into a point and are imaged on the photosensitive element 6. Subsequently, taking one of the many light rays emitted from the arrow tip as an example, the imaging light ray 12 parallel to the optical axis 13 of the imaging optical path enters the box body 1 through the specimen hole 3. The imaging light ray 12 remains parallel to the optical axis 13 of the imaging optical path after being reflected by the first mirror 10 and reaches the imaging objective lens 4. After being refracted by the imaging objective lens 4, the direction of the imaging light ray 12 is changed, so that the imaging light ray 12 is no longer parallel to the optical axis 13 of the imaging optical path, but travels straight towards the focal point direction of the imaging objective lens 4 until it enters the second mirror 11 directly below the photographing hole 2, and is reflected by the second mirror 11 to reach the focal point of the imaging objective lens 4. The camera lens 5 and the photographing hole 2 are both coaxially arranged with the optical axis 13 of the imaging optical path, and the camera lens 5 is located at the focal point of the imaging objective lens 4. Therefore, the imaging light ray 12 traveling straight towards the focal point direction of the imaging objective lens 4 does not refract when passing through the center point of the camera lens 5 and still travels straight and is imaged on the photosensitive element 6.

[0046] As Figure 5 shown, the optical principle of the second embodiment of the present invention is the same as that of the first embodiment. Specifically, the trace evidence 9 can form a first virtual image 9' through the first mirror 10, and the first virtual image 9' can form a second virtual image 9'' through the second mirror 11, and the imaging objective lens 4 can form a third virtual image 4'' through the second mirror 11. The third virtual image 4'' is located directly above the second virtual image 9''. Therefore, in the second embodiment, by placing two parallel mirrors for imaging, it is equivalent to the light emitted from the second virtual image 9'' passing through the third virtual image 4'', then entering the photographing hole 2, and finally being imaged by the camera. That is, the same optical path imaging principle is adopted in the first embodiment and the second embodiment. And through the above description, it can be known that the optical path imaging principle of the second embodiment can be referred to Figure 6 and Figure 7 . In the second embodiment, the optical magnification (the ratio of the lateral dimensions of the image to the object) is still h2÷h1 = u÷f, where the focal length f and the distance u are both fixed constants. Therefore, the optical magnification is still a fixed constant. Then, no matter how the photographing distance PD between the bottom of the box body 1 and the trace evidence 9 changes, the imaging size of the trace evidence 9 always remains unchanged.

[0047] In the first and second embodiments of the present invention, the same optical path imaging principle is adopted. Therefore, only one of the technical solutions is selected for specific experimental verification:

[0048] Figure 8 and Figure 9 are the physical scale photos taken by a mobile phone with specially developed photo software with an electronic scale through the trace evidence photographing device of the second embodiment at the photographing distances PD = 0 cm and PD = 12 cm respectively. The electronic scale has been synthesized on the photos.

[0049] Figure 8 and Figure 9 have exactly the same magnification, and the synthesized electronic scale with a white background and black lines is also exactly the same. As can be seen in the figure, the scale lines of the electronic scale and the physical scale correspond one by one. From this, it is judged that Figure 8 and Figure 9 the images of the physical scales taken are also of the same size, that is to say, the images of the physical scales taken at the photographing distances PD = 0 cm and PD = 12 cm are of the same size. The experimental verification shows that as long as the electronic scale of the trace evidence photographing device of the present invention is calibrated well before leaving the factory, regardless of how the photographing distance changes, the user does not need to calibrate the electronic scale during the use process.

[0050] In summary, for the trace evidence photographing device of the present invention, by setting the camera lens 5 at the focus of the imaging objective lens 4, the purpose of keeping the optical magnification (the ratio of the lateral dimensions of the image to the object) unchanged with the change of the photographing distance is achieved. It can not only take photos of trace evidence at the crime scene at different photographing distances, but also keep the imaging size of the trace evidence unchanged, thus solving the problem that the electronic scale needs to be recalibrated once the photographing distance changes when using the electronic scale to replace the physical scale for photographing. It not only eliminates the need to calibrate the electronic scale, but also can avoid contaminating or damaging potential evidence on the object, making the work of photographing trace evidence at the crime scene more convenient, efficient and safe. A small invention solves a big problem, and it has novelty, creativity and practicality for the photographing and fixation of trace evidence at the crime scene.

[0051] Compared with the first embodiment, in the second embodiment, two optical reflecting devices are arranged in the imaging optical path: the first reflecting mirror 10 and the second reflecting mirror 11. In addition to obtaining the beneficial effects of the first embodiment, the second embodiment can also obtain the beneficial effects of reducing the height of the photographing device, making the photographing device more compact and convenient to use; in addition, the box body 1 is not limited to the shape and structure in the first and second embodiments.

[0052] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. For example, by changing Embodiment 2 and placing the imaging objective lens 4 between the specimen hole 3 and the first reflector 10, the same effect as that of the present invention can also be obtained. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0053] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A trace evidence photographing device, adapted to be connected with a built-in camera device, wherein the camera part of the built-in camera device includes a camera lens and a photosensitive element, and the trace evidence photographing device includes a box body, wherein the box body is provided with a sample hole and a photographing hole, and is characterized in that: The box body is equipped with an imaging objective lens placed on the imaging light path between the inspection hole and the photographic hole; the camera lens, photographic hole, imaging objective lens, inspection hole and the optical axis of the imaging light path are all coaxially arranged, and the camera lens is located at the focus of the imaging objective lens, so that the trace evidence located below the inspection hole is imaged on the photosensitive element.

2. A trace evidence photographing device according to claim 1, characterized in that: The built-in camera device is placed on the top of the box, the camera hole is placed on the top of the box, and the inspection hole is placed on the bottom of the box.

3. The trace evidence photographing device according to claim 1, characterized in that: The trace evidence is imaged on the photosensitive element and satisfies: the ratio of the optical imaging length of the trace evidence to the length of the trace evidence is equal to the ratio of the distance from the camera lens to the photosensitive element to the focal length of the imaging objective lens.

4. A trace evidence photographing device according to any one of claims 1 to 3, characterized in that: The imaging objective lens is located directly above the sample inspection hole, and the photographic hole is located directly above the imaging objective lens.

5. A trace evidence photographing device according to any one of claims 1 to 3, characterized in that: A reflective component is arranged on the imaging light path in the box, and the reflective component includes a first reflector and a second reflector. The imaging objective lens is arranged on the imaging light path between the first reflector and the second reflector. The first reflector is located directly above the sample hole, and the second reflector is located directly below the photographic hole.

6. A trace evidence photographing device according to claim 5, characterized in that: The first reflector is at an angle of 45° to the horizontal plane, so as to reflect the optical axis of the imaging light path entering the box through the sample hole to enter the imaging objective lens in a horizontal direction; the second reflector is at an angle of 135° to the horizontal plane, so as to reflect the optical axis of the imaging light path in the horizontal direction to enter the photographic hole in a vertical upward direction.

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