A multi-dimensional coaxial imaging device

Abstract

The present application relates to the technical field of visual detection, and particularly relates to a multi-dimensional coaxial imaging device, which comprises a device shell, a detection area and a light path area are formed in the device shell along a Z axis; a workpiece to be detected is placed on the detection area; an observation window is arranged on the device shell and is in communication with the inside of the device shell, a detection input port is arranged on the front side of the device shell and is in communication with the detection area; a first light source group is arranged in the inside of the device shell, the first light source group comprises a first coaxial light source module and a first optical lens group, the first coaxial light source module is arranged opposite to the detection area along a Y axis direction; a second light source group is arranged in the inside of the device shell, the second light source group comprises a second coaxial light source module and a second optical lens group, the second coaxial light source module is arranged opposite to the detection area along an X axis direction. The present application realizes synchronous acquisition of multi-dimensional information in single detection, and significantly improves detection efficiency and data consistency.

Description

Technical Field

[0001] This invention relates to the field of visual inspection technology, and in particular to a multi-dimensional coaxial imaging device. Background Technology

[0002] In the field of high-precision industrial vision inspection, achieving comprehensive and high-quality imaging of products with complex geometries (such as deep holes, steps, curved surfaces, and grooves) and high reflectivity (metals, mirrors, and coatings) has always been a core challenge and a key technological hurdle. Existing inspection solutions suffer from the following systemic deficiencies when dealing with such complex inspection tasks:

[0003] 1. Using a single illumination mode, traditional coaxial light can suppress specular reflection and clearly present planar features, but it cannot effectively illuminate areas such as deep holes and sidewalls, creating information blind spots; low-angle ring light can highlight the contours of sidewalls, but it is easy to form strong flares in planar or highly reflective areas, obscuring the true defects; a single mode cannot simultaneously meet the opposing needs of different geometric features for illumination conditions.

[0004] 2. In order to overcome the shortcomings of a single lighting mode, multiple light source combinations are commonly used in the market. That is, multiple light sources are stacked to obtain multi-dimensional information. However, such multiple light source combinations are prone to optical path cross-interference, stray light pollution of images, and occupy a large space, messy wiring, and complicated debugging. High power density causes local temperature rise, affecting optical stability. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a multi-dimensional coaxial imaging device. This invention realizes the synchronous acquisition of multi-dimensional information in a single detection, which significantly improves detection efficiency and data consistency.

[0006] To achieve the above objectives, the present invention provides a multi-dimensional coaxial imaging device, comprising:

[0007] The device housing has a detection area and an optical path area stacked along the Z-axis inside; the workpiece to be measured is placed on the detection area; the device housing has an observation window communicating with the interior of the device housing, and a detection input port communicating with the detection area is opened on the front side of the device housing;

[0008] The first light source group is disposed inside the device housing. The first light source group includes a first coaxial light source module and a first optical lens group. The first coaxial light source module is disposed opposite to the detection area along the Y-axis direction. The first optical lens group is disposed between the first coaxial light source module and the detection area along the X-axis direction, so that the first optical lens group is disposed opposite to the detection area and the observation window respectively.

[0009] The second light source group is located inside the device housing. The second light source group includes a second coaxial light source module and a second optical lens group. The second coaxial light source module is arranged opposite to the detection area along the X-axis. The second optical lens group is arranged between the second coaxial light source module and the detection area along the Z-axis. The other end of the second optical lens group is placed in the optical path area and is arranged opposite to the observation window.

[0010] Furthermore, the first optical lens group includes a first prism and a first reflecting prism. The first coaxial light source module is coaxially arranged with the first prism along the Y-axis. The detection area is located on the positive Y-axis side of the first prism, so that the light emitted by the first coaxial light source module can be transmitted through the first prism along the Y-axis and illuminate the side of the workpiece being measured. The first reflecting prism is arranged opposite to the first prism along the X-axis. The reflecting surface of the first reflecting prism faces the first prism and is opposite to the direction of the observation window, which is used to deflect the light from the first prism to the observation window.

[0011] Furthermore, the first light source group also includes a first mounting base and a first cold light source. The first cold light source is fixed to the lower side of the device housing via the first mounting base. The first cold light source, the first coaxial light source module, and the detection area are coaxially arranged in the Y-axis direction.

[0012] Furthermore, the first coaxial light source module includes a first light source housing arranged along the Y-axis direction, a first LED light source array and a first coaxial diffuser plate built into the first light source housing, and a first mounting groove and a second mounting groove arranged along the X-axis direction are provided on the lower side of the first light source housing, and the first prism and the first reflecting prism are respectively snapped into the first mounting groove and the second mounting groove.

[0013] Furthermore, the first prism is a semi-transparent, semi-reflective square prism, and the first reflecting prism is a roof prism.

[0014] Furthermore, the second optical lens group includes a second prism, a second reflecting prism, and a third reflecting prism. The second coaxial light source module is coaxially arranged with the second prism along the X-axis. The detection area is located on the positive X-axis side of the second prism, so that the light emitted by the second coaxial light source module can be transmitted along the X-axis through the second prism and illuminate the other side of the workpiece being measured. The second reflecting prism is arranged opposite to the second prism along the Z-axis. The third reflecting prism is arranged opposite to the second reflecting prism along the X-axis and opposite to the direction of the observation window, and is used to deflect the light from the second prism to the observation window.

[0015] Furthermore, the second light source group also includes a second mounting base and a second cold light source. The second cold light source is fixed to one side of the device housing via the second mounting base. The second cold light source, the second coaxial light source module, and the detection area are coaxially arranged in the X-axis direction.

[0016] Furthermore, the second coaxial light source module includes a second light source housing, a prism mounting base, a second LED light source array, and a second coaxial diffuser plate built into the second light source housing. A third mounting groove and a fourth mounting groove are provided on the side of the second light source housing away from the second coaxial diffuser plate, which are arranged along the Z-axis. The second prism and the second reflecting prism are respectively snapped into the third mounting groove and the fourth mounting groove. The prism mounting base is fixed to the other side of the device housing relative to the second light source housing. The prism mounting base is placed in the optical path area and is arranged opposite to the second light source housing. The third reflecting prism is fixed to the prism mounting base.

[0017] Furthermore, the second prism is a semi-transparent, semi-reflective square prism, and both the second and third reflecting prisms are triangular reflecting prisms.

[0018] Furthermore, the device housing includes a back plate, a front plate, a left side plate, a right side plate, a top plate, and a bottom plate that are spliced ​​together. The plates are fastened together by countersunk screws and positioning pins. The detection input port is located on the front plate, and the observation window is located on the bottom plate.

[0019] Compared with existing technologies, this invention uses a first light source group and a second light source group to construct two independent illumination-observation optical paths that are optically isolated from each other. It enables simultaneous observation of different sides of the same observation target from multiple angles and in multiple modes. The light from different channels is strictly guided within the two optical lens groups to avoid crosstalk and achieve high image purity. This enables the synchronous acquisition of multi-dimensional information in a single setup, significantly improving detection efficiency and data consistency.

[0020] This invention integrates optical components such as semi-transparent and semi-reflective square prisms, roof prisms, and triangular prisms into a compact device housing through precision optical bonding or micron-level positioning assembly. All optical components are fixedly assembled into a whole, exhibiting strong vibration resistance, permanent stable optical axis relationship, maintenance-free operation, and high stability. This invention compresses the multi-view detection that traditionally requires multiple cameras or multiple workstations into a single camera and single workstation, greatly improving detection efficiency while avoiding the calibration and synchronization problems of multi-camera systems. Attached Figure Description

[0021] To more clearly illustrate the technology in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a multi-dimensional coaxial imaging device according to the present invention;

[0023] Figure 2 yes Figure 1 A schematic diagram of the decomposition process;

[0024] Figure 3 yes Figure 1 A cross-sectional view along line AA in the middle;

[0025] Figure 4 This is a schematic diagram after the front panel, part of the first light source housing, and part of the second light source housing have been hidden.

[0026] Figure 5 This is a schematic diagram of the structure of the first light source group of the present invention;

[0027] Figure 6 yes Figure 5 A cross-sectional view along the BB line;

[0028] Figure 7 This is a schematic diagram of the structure of the second light source group of the present invention (part of the housing of the second light source housing is hidden);

[0029] Figure 8 This is a schematic diagram of the two optical paths of the present invention;

[0030] Figure 9 yes Figure 8 A magnified diagram of region C.

[0031] The diagram includes:

[0032] 1. Device housing; 11. Detection area; 12. Optical path area; 13. Observation window; 14. Detection input port; 15. Back plate; 16. Front plate; 161. Second through hole; 17. Left side plate; 18. Right side plate; 19. Top plate; 191. First through hole; 10. Bottom plate; 101. Long strip mounting hole; 2. First light source group; 21. First coaxial light source module; 211. First light source housing; 212. First LED light source array; 213. First coaxial diffuser plate; 214. First vertical section; 215. First horizontal section; 216. First mounting slot; 217. Second mounting slot; 218. First heat sink; 22. First optical lens group; 221. First prism; 2 22. First reflecting prism; 23. First cold light source; 231. First mounting base; 3. Second light source group; 31. Second coaxial light source module; 311. Second light source housing; 312. Prism fixing base; 313. Second LED light source array; 314. Second coaxial diffuser plate; 315. Second vertical section; 316. Second horizontal section; 317. Third mounting slot; 318. Fourth mounting slot; 319. Second heat sink; 32. Second optical lens group; 321. Second prism; 322. Second reflecting prism; 323. Third reflecting prism; 33. Second cold light source; 331. Second mounting base; 4. Camera; 5. Detection workpiece; 6. First optical path; 7. Second optical path. Detailed Implementation

[0033] The technology of this embodiment of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the invention, and not all embodiments. Based on this embodiment of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0035] Furthermore, if the embodiments of the present invention involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0036] Please see Figures 1 to 9 The present invention provides a multi-dimensional coaxial imaging device, comprising:

[0037] The device housing 1 has a detection area 11 and an optical path area 12 stacked along the Z-axis inside the device housing 1; the workpiece to be measured is placed on the detection area 11; the device housing 1 has an observation window 13 that communicates with the inside of the device housing 1; and the front side of the device housing 1 has a detection input port 14 that communicates with the detection area 11.

[0038] The first light source group 2 is disposed inside the device housing 1. The first light source group 2 includes a first coaxial light source module 21 and a first optical lens group 22. The first coaxial light source module 21 is disposed opposite to the detection area 11 along the Y-axis direction. The first optical lens group 22 is disposed between the first coaxial light source module 21 and the detection area 11 along the X-axis direction, so that the first optical lens group 22 is disposed opposite to the detection area 11 and the observation window 13 respectively.

[0039] The second light source group 3 is disposed inside the housing 1 of the device. The second light source group 3 includes a second coaxial light source module 31 and a second optical lens group 32. The second coaxial light source module 31 is disposed opposite to the detection area 11 along the X-axis direction. The second optical lens group 32 is disposed between the second coaxial light source module 31 and the detection area 11 along the Z-axis direction. The other end of the second optical lens group 32 is placed in the optical path area 12 and is disposed opposite to the observation window 13.

[0040] like Figure 2 As shown, in this embodiment, the device housing 1 includes a back plate 15, a front plate 16, a left side plate 17, a right side plate 18, a top plate 19, and a bottom plate 10 that are spliced ​​together. The plates are fastened together by countersunk screws and locating pins. The left side plate 17 and the right side plate 18 are arranged in parallel. The back plate 15 and the front plate 16 are arranged in parallel, and their ends are locked to the ends of the left side plate 17 and the right side plate 18, respectively. The top plate 19 and the bottom plate 10 are respectively positioned at the upper and lower ends and locked to the left side plate 17 and the right side plate 18, thereby forming a hollow device housing 1. Figure 3 As shown, from inside the device housing 1 Figure 3 The dashed line divides the internal space of the device housing 1 along the X-axis, forming a parallel detection area 11 and an optical path area 12. Specifically, the area near the front plate 16 is the detection area 11, used to place the workpiece 5 to be detected, and the area near the back plate 15 is the optical path area 12, used to accommodate the optical path and imaging components. The two are arranged in parallel so that when the workpiece 5 is placed in the detection area 11, it will not interfere with the light propagation in the optical path area 12. The detection input port 14 is located on the front plate 16, and the observation window 13 is located on the bottom plate 10. The observation window 13 penetrates the bottom plate 10 along the Z-axis and maintains optical path communication with both the detection area 11 and the optical path area 12.

[0041] like Figures 4 to 6As shown, in this embodiment, the first light source group 2 is positioned directly above the detection area 11 to detect the upper side of the workpiece 5. The first coaxial light source module 21 includes a first light source housing 211 arranged along the Y-axis, a first LED light source array 212 and a first coaxial diffuser plate 213 built into the first light source housing 211, and the first optical lens group 22 includes a first prism 221 and a first reflecting prism 222. The upper end and right side of the first light source housing 211 are fixedly connected to the top plate 19 and the right side plate 18, respectively. Figure 4 As shown, the first light source housing 211 has an "L" shaped structure, which includes a first vertical section 214 and a first horizontal section 215 arranged perpendicularly to each other. The first vertical section 214 extends along the Y-axis, and the first horizontal section 215 extends along the X-axis. The first LED light source array 212, the first coaxial diffuser plate 213, and the first prism 221 are arranged sequentially from top to bottom on the first vertical section 214, realizing the coaxial arrangement of the first coaxial light source module 21 and the first prism 221 along the Y-axis. At this time, the detection area 11 is located on the positive Y-axis side of the first prism 221, so that the light emitted by the first coaxial light source module 21 can be transmitted along the Y-axis through the first prism 221 and illuminate the upper side of the workpiece being tested.

[0042] On the lower side of the first light source housing 211, i.e. the first horizontal section 215, there are a first mounting groove 216 and a second mounting groove 217 arranged along the X-axis direction. The first prism 221 and the first reflecting prism 222 are respectively snapped into the first mounting groove 216 and the second mounting groove 217, so that the first reflecting prism 222 and the first prism 221 are arranged opposite to each other along the X-axis direction, and the reflecting surface of the first reflecting prism 222 faces the first prism 221 and is opposite to the direction of the observation window 13, so as to deflect the light from the first prism 221 to the observation window 13. The first mounting groove 216 is placed in the overlapping area of ​​the first vertical section 214 and the first horizontal section 215, so that the first prism 221 can be coaxially arranged with the first coaxial light source module 21 and the first reflecting prism 222 at the same time. Thus, the light reflected from the workpiece being tested passes through the first prism 221 and the first reflecting prism 222 in sequence, and then passes through the observation window 13 along the Y-axis direction, finally entering the imaging system to complete image acquisition. The entire optical path is designed to be compact and stable, and each optical element is precisely positioned, ensuring that the light propagation path is unique and free from stray light interference during the detection process, significantly improving imaging contrast and edge recognition accuracy.

[0043] Furthermore, the first light source group 2 also includes a first mounting base 231 and a first cold light source 23. The first cold light source 23 is fixed to the lower side of the device housing 1 via the first mounting base 231. The first cold light source 23, the first coaxial light source module 21, and the detection area 11 are coaxially arranged in the Y-axis direction. The first cold light source 23 works in conjunction with the first coaxial light source module 21 to provide supplementary lighting directly below the detection area 11 (fixed to the lower side of the housing via the first mounting base 231). Because it is a cold light source, it generates almost no heat when emitting light, avoiding the impact on detection accuracy due to thermal expansion or deformation of the workpiece. This is particularly important for high-precision dimensional measurement or micron-level defect detection.

[0044] In this preferred embodiment, the first prism 221 is a semi-transparent and semi-reflective square prism, the first reflecting prism 222 is a roof prism, and the interior of the first prism 221 is provided with a semi-transparent and semi-reflective optical film arranged at 45° diagonally.

[0045] Furthermore, a first heat sink 218 for dissipating heat from the first LED light source array 212 is also provided on the first light source housing 211. A first through hole 191 is provided on the top plate 19. The first heat sink 218 contacts the external space through the first through hole 191 to dissipate heat. At the same time, the wiring can be laid through the first through hole 191 to ensure that the temperature of the LED light source array remains within the safe threshold during long-term stable operation. The first heat sink 218 is integrally die-cast from high thermal conductivity aluminum alloy and the surface is anodized, which improves both heat dissipation efficiency and structural durability.

[0046] like Figure 2 , Figure 4 and Figure 7 As shown, in this embodiment, the second light source group 3 is positioned on the left side of the detection area 11 to detect the left side of the workpiece 5. The second coaxial light source module 31 includes a second light source housing 311, a prism mounting base 312, and a second LED light source array 313 and a second coaxial diffuser plate 314 built into the second light source housing 311. The second optical lens group 32 includes a second prism 321, a second reflecting prism 322, and a third reflecting prism 323. The lower end of the second light source housing 311 is directly fixed to the base plate 10, as shown... Figure 7As shown, the second light source housing 311 has an L-shaped structure, including a second vertical section 315 and a second horizontal section 316. The second vertical section 315 extends along the X-axis direction, and the second horizontal section 316 extends along the Z-axis direction, so that the second horizontal section 316 can be placed directly in front of the detection area 11 and the optical path area 12 respectively. The second LED light source array 313, the second coaxial diffuser plate 314 and the second prism 321 are coaxially arranged in the second vertical section 315 from left to right along the X-axis direction. The second coaxial light source module 31 and the second prism 321 are coaxially arranged along the X-axis direction. At this time, the detection area 11 is located on the positive X-axis side of the second prism 321, so that the light emitted by the second coaxial light source module 31 can be transmitted through the second prism 321 along the X-axis and illuminate the left side of the workpiece being tested.

[0047] On the side of the second light source housing 311 away from the second coaxial diffuser plate 314, namely the second horizontal section 316, a third mounting groove 317 and a fourth mounting groove 318 are provided along the Z-axis direction. The second prism 321 and the second reflecting prism 322 are respectively snapped into the third mounting groove 317 and the fourth mounting groove 318, so that the second reflecting prism 322 and the second prism 321 are arranged opposite to each other along the Z-axis direction. In this embodiment, the second prism 321 is a semi-transparent and semi-reflective square prism, and the second reflecting prism 322 is a triangular reflecting prism. The interior of the second prism 321 is provided with a semi-transparent and semi-reflective optical film arranged at 45° diagonally, and the surface of the second reflecting prism 322 is coated with a high-reflection film to ensure that the light is perpendicularly incident on the second reflecting prism 322 after being transmitted through the second prism 321, and turns at 90° along the positive X-axis direction through the light path region 12 to enter the third reflecting prism 323.

[0048] The prism holder 312 is fixed to the other side of the device housing 1 opposite to the second light source housing 311, as shown in the figure. The device housing 1 and the prism holder 312 are respectively disposed on both sides of the optical path region 12. The prism holder 312 is positioned in the optical path region 12 opposite to the second light source housing 311. The third reflecting prism 323 is fixed to the prism holder 312. The third reflecting prism 323 and the second reflecting prism 322 are positioned opposite each other along the X-axis and opposite to the direction of the observation window 13. The light from the second prism 321 is redirected at 90° and passes through the observation window 13 along the positive Y-axis. Finally, the image is captured by the camera 4. The first mounting slot 216 is placed in the overlapping area of ​​the first vertical section 214 and the first horizontal section 215, so that the first prism 221 can be coaxially set with the first coaxial light source module 21 and the first reflecting prism 222 at the same time. The third reflecting prism 323 is a triangular reflecting prism. A high reflectivity film is set on the third reflecting prism 323 to ensure efficient reflection of light, ensure stable light path and clear imaging. It should be noted that the high reflectivity film is generally a reflectivity film with a reflectivity of ≥90%, preferably a medium high reflectivity film with a reflectivity of ≥95%.

[0049] Furthermore, the second light source group 3 also includes a second mounting base 331 and a second cold light source 33. The second cold light source 33 is fixed to the right side plate 18 via the second mounting base 331. The second cold light source 33, the second coaxial light source module 31, and the detection area 11 are coaxially arranged in the X-axis direction. The second cold light source 33 works in conjunction with the second coaxial light source module 31 to provide supplementary lighting in the detection area 11. Because it is a cold light source, it generates almost no heat when emitting light, avoiding the impact on detection accuracy due to thermal expansion or deformation of the workpiece. This is particularly important for high-precision dimensional measurement or micron-level defect detection.

[0050] Preferably, a second heat sink 319 is also provided on the second light source housing 311 to abut against the second LED light source array 313. A heat dissipation gap is provided between the second light source housing 311 and the left side plate 17, so that the second heat sink 319 has a good heat dissipation area. At the same time, a second through hole 161 is opened on the front plate 16. The position of the second through hole 161 corresponds to the second heat sink 319. The second through hole 161 can be used for circuit layout and to assist in the heat dissipation of the second heat sink 319, ensuring that the temperature of the LED light source array remains within the safe threshold during long-term stable operation. The second heat sink 319 is integrally die-cast from high thermal conductivity aluminum alloy and the surface is anodized, which improves both heat dissipation efficiency and structural durability.

[0051] In some embodiments, a U-shaped elongated mounting hole 101 is provided on the base plate 10. The second light source housing 311 is threadedly connected to the base plate 10 through the U-shaped elongated mounting hole 101, which facilitates fine adjustment of the position of the second light source housing 311 along the X-axis direction, thereby accurately calibrating the optical axis coincidence of the second coaxial light source module 31 and the detection area 11. Furthermore, a precise linear drive mechanism can be provided to perform precise displacement control of the light source housing, such as a stepper motor combined with a lead screw module.

[0052] This invention enables detection using dual optical paths, and different combinations of optical paths can be selected to form different modes to meet different needs.

[0053] First, determine the dual optical path implemented in this invention, such as... Figure 8 and Figure 9 As shown, the first optical path 6 ( Figure 8The observation channel (with the hollow arrow in the image) is used to place the workpiece 5 in the detection area 11. The light emitted from the first coaxial light source module 21 passes through the first prism 221 from the Y-axis direction and is perpendicularly incident on the upper side of the workpiece 5 in the detection area 11. The first cold light source 23 provides counter-lighting. The light is reflected by the workpiece surface and returns along the original path. After being reflected by the first prism 221, it enters the first reflecting prism 222 and is then turned 90° along the positive Y-axis through the observation window 13, and finally received by the camera 4. This light path is turned by the first reflecting prism 222 (total reflection roof prism) to realize the observation of the top and specific side wall features of the product from a top view (a side wall can be fixed to replace the top position of this application), providing a shadowless, high-contrast basic image, which is suitable for planar defect detection and character recognition.

[0054] Each reflecting prism's optical surface is coated with a reflective film, and each semi-transparent, semi-reflective square prism is coated with a semi-transparent, semi-reflective film to ensure the independence of each optical path and low loss, and to suppress stray light to the maximum extent.

[0055] Second optical path 7 ( Figure 8 and Figure 9 The lateral detection channel (with the solid arrow in the image) is formed as follows: the light emitted by the second coaxial light source module 31 passes through the second prism 321 and is horizontally incident on the right side of the workpiece 5 along the X-axis. The second cold light source 33 provides synchronous supplementary light. The reflected light is deflected by 90° by the second prism 321 and enters the second reflecting prism 322. The second reflecting prism 322 turns the light by 90° and passes through the light path area 12 along the X-axis before entering the third reflecting prism 323. Subsequently, the third reflecting prism 323 deflects the light beam by 90° again, so that it enters the camera 4 along the positive Z-axis. Both the second reflecting prism 322 and the third reflecting prism 323 are total reflection triangular prisms, which enable observation of the features of the other side of the product from a side viewpoint, supplementing the viewpoint information that the first channel cannot cover. It is especially suitable for the detection of side wall textures and groove inner walls.

[0056] By combining the composite optical path design of the first light source group 2 and the second light source group 3 with independent control of the light sources, multiple imaging modes can be achieved:

[0057] Mode A (Top View Enhancement Mode): Only the first light source group 2 is turned on, the first optical path is working, and the camera 4 acquires a top view coaxial image that has been refracted by the first reflecting prism 222, which is used to detect top plane features.

[0058] Mode B (Side View Enhancement Mode): Only the second light source group 3 is turned on, the second optical path is working, and the camera 4 acquires a side view coaxial image that is refracted by the second prism 321, the second reflection prism 322 and the third reflection prism 323, which is used to detect side features.

[0059] Mode C (Dual-channel fusion mode): The first light source group 2 and the second light source group 3 are turned on at the same time, and the camera 4 receives light information from both channels at the same time, realizing "parallel imaging" to acquire multi-view images in a single exposure.

[0060] Mode D (Scan Reconstruction Mode): During continuous motion, the first light source group 2 and the second light source group 3 are switched alternately, while the position of the second coaxial light source module 31 is adjusted, and the three-dimensional shape of the product is reconstructed by combining the algorithm.

[0061] This invention compresses the multi-view inspection process, which traditionally requires multiple cameras or multiple workstations, into a single camera and single workstation, significantly improving inspection efficiency while avoiding the calibration and synchronization challenges of multi-camera systems. Each corner coaxial light source employs a standard structure with a high-uniformity surface light source and a semi-transparent, semi-reflective prism, ensuring high collimation and uniformity of the emitted light. For highly reflective curved surfaces such as metals and mirrors, coaxial illumination effectively suppresses specular reflection flares, making surface defects (such as fine scratches, pits, and oxidation points) clearly visible due to differences in scattered light. Two coaxial lights in different directions can separately address reflection issues in areas of different curvatures, ensuring high-quality imaging across the entire product area.

[0062] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-dimensional coaxial imaging device, characterized in that, include: The device housing (1) has a detection area (11) and an optical path area (12) stacked along the Z-axis inside the device housing (1); The workpiece to be tested is placed on the detection area (11); an observation window (13) communicating with the inside of the device housing (1) is provided on the device housing (1), and a detection input port (14) communicating with the detection area (11) is opened on the front side of the device housing (1); The first light source group (2) is set inside the device housing (1). The first light source group (2) includes a first coaxial light source module (21) and a first optical lens group (22). The first coaxial light source module (21) is arranged opposite to the detection area (11) along the Y-axis direction. The first optical lens group (22) is arranged between the first coaxial light source module (21) and the detection area (11) along the X-axis direction, so that the first optical lens group (22) is arranged opposite to the detection area (11) and the observation window (13) respectively. The second light source group (3) is located inside the housing (1) of the device. The second light source group (3) includes a second coaxial light source module (31) and a second optical lens group (32). The second coaxial light source module (31) is arranged opposite to the detection area (11) along the X-axis direction. The second optical lens group (32) is arranged between the second coaxial light source module (31) and the detection area (11) along the Z-axis direction. The other end of the second optical lens group (32) is placed in the optical path area (12) and is arranged opposite to the observation window (13).

2. The multi-dimensional coaxial imaging device according to claim 1, characterized in that, The first optical lens group (22) includes a first prism (221) and a first reflecting prism (222). The first coaxial light source module (21) and the first prism (221) are coaxially arranged along the Y-axis. The detection area (11) is located on the positive Y-axis side of the first prism (221), so that the light emitted by the first coaxial light source module (21) can be transmitted through the first prism (221) along the Y-axis and illuminate the side of the workpiece under test. The first reflecting prism (222) and the first prism (221) are arranged opposite to each other along the X-axis. The reflecting surface of the first reflecting prism (222) faces the first prism (221) and is opposite to the direction of the observation window (13), which is used to deflect the light from the first prism (221) to the observation window (13).

3. The multi-dimensional coaxial imaging device according to claim 2, characterized in that, The first light source group (2) also includes a first mounting base (231) and a first cold light source (23). The first cold light source (23) is fixed to the lower side of the device housing (1) through the first mounting base (231). The first cold light source (23) is coaxially arranged with the first coaxial light source module (21) and the detection area (11) in the Y-axis direction.

4. The multi-dimensional coaxial imaging device according to claim 2, characterized in that, The first coaxial light source module (21) includes a first light source housing (211) arranged along the Y-axis direction, a first LED light source array (212) and a first coaxial diffuser plate (213) built into the first light source housing (211). A first mounting groove (216) and a second mounting groove (217) arranged along the X-axis direction are provided on the lower side of the first light source housing (211). The first prism (221) and the first reflecting prism (222) are respectively snapped into the first mounting groove (216) and the second mounting groove (217).

5. A multi-dimensional coaxial imaging device according to claim 2, characterized in that, The first prism (221) is a semi-transparent and semi-reflective square prism, and the first reflecting prism (222) is a roof prism.

6. The multi-dimensional coaxial imaging device according to claim 1, characterized in that, The second optical lens group (32) includes a second prism (321), a second reflecting prism (322), and a third reflecting prism (323). The second coaxial light source module (31) and the second prism (321) are coaxially arranged along the X-axis. The detection area (11) is located on the positive X-axis side of the second prism (321), so that the light emitted by the second coaxial light source module (31) can be transmitted through the second prism (321) along the X-axis and illuminate the other side of the workpiece being measured. The second reflecting prism (322) and the second prism (321) are arranged opposite to each other along the Z-axis. The third reflecting prism (323) and the second reflecting prism (322) are arranged opposite to each other along the X-axis and opposite to the direction of the observation window (13), and are used to deflect the light from the second prism (321) to the observation window (13).

7. A multi-dimensional coaxial imaging device according to claim 6, characterized in that, The second light source group (3) also includes a second mounting base (331) and a second cold light source (33). The second cold light source (33) is fixed to one side of the device housing (1) through the second mounting base (331). The second cold light source (33) is coaxially arranged with the second coaxial light source module (31) and the detection area (11) in the X-axis direction.

8. A multi-dimensional coaxial imaging device according to claim 6, characterized in that, The second coaxial light source module (31) includes a second light source housing (311), a prism mounting base (312), a second LED light source array (313) and a second coaxial diffuser plate (314) built into the second light source housing (311). A third mounting groove (317) and a fourth mounting groove (318) are provided on the side of the second light source housing (311) away from the second coaxial diffuser plate (314) along the Z-axis direction. The second prism (321) and the second reflecting prism (322) are respectively snapped into the third mounting groove (317) and the fourth mounting groove (318). The prism mounting base (312) is fixed to the other side of the device housing (1) relative to the second light source housing (311). The prism mounting base (312) is placed in the optical path area (12) opposite to the second light source housing (311). The third reflecting prism (323) is fixed to the prism mounting base (312).

9. A multi-dimensional coaxial imaging device according to claim 6, characterized in that, The second prism (321) is a semi-transparent and semi-reflective square prism, and the second reflecting prism (322) and the third reflecting prism (323) are both triangular reflecting prisms.

10. A multi-dimensional coaxial imaging device according to claim 1, characterized in that, The device housing (1) includes a back plate (15), a front plate (16), a left side plate (17), a right side plate (18), a top plate (19), and a bottom plate (10) that are spliced ​​together. The plates are fastened together by countersunk screws and positioning pins. The detection input port (14) is located on the front plate (16), and the observation window (13) is located on the bottom plate (10).

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