Multi-angle imaging device

Abstract

The present invention discloses a multi-angle imaging device. The multi-angle imaging device includes: a translation stage for placing and moving a to-be-measured object to a preset position; a camera module spaced on one side of the translation stage where the to-be-measured object is placed and inclined with respect to the horizontal direction of the translation stage; a multi-angle reflecting prism spaced on the side of the camera module away from the translation stage; two fixed reflecting mirrors spaced between the translation stage and the multi-angle reflecting prism and spaced on opposite sides of the camera module; and a light source group spaced on one side of the translation stage where the to-be-measured object is placed to emit light sources to the preset position. The above solution can achieve multi-angle imaging of the to-be-measured object using the camera module, and the multi-angle images obtained are naturally aligned, naturally avoiding the subsequent alignment step, facilitating synchronous analysis of the multi-angle images, and improving the analysis efficiency and accuracy.

Description

Technical Field

[0001] The present invention relates to the field of image imaging, and particularly to a multi-angle imaging device. Background Art

[0002] The circuit board industry is an important part of the entire industrial chain of the electronics industry. The circuit board industry is characterized by large production volume, complex processes, and high quality inspection requirements.

[0003] Currently, the quality inspection method of most circuit board manufacturers is manual inspection. After relying on the existing imaging system to capture images, the quality inspector judges defects by observing the images. The method of manual inspection is inefficient and has low accuracy.

[0004] The imaging quality of the existing imaging system is lacking. It is impossible to achieve ideal imaging of each area of the product with a single camera. Using multiple cameras will increase costs, and it is difficult to align the images obtained by multiple cameras and synchronously analyze them. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is to provide a multi-angle imaging device to solve the problem that the images taken by multiple cameras of the imaging system are difficult to align.

[0006] To solve the above problems, the present invention provides a multi-angle imaging device, which includes: a translation stage for placing and moving a to-be-tested object to a preset position; a camera module spaced apart on one side of the translation stage where the to-be-tested object is placed and inclined to the preset position of the translation stage; a multi-angle reflecting prism spaced apart on the side of the camera module away from the translation stage; two fixed reflecting mirrors spaced apart between the translation stage and the multi-angle reflecting prism and respectively arranged on opposite sides of the camera module; and a light source group spaced apart on the side of the translation stage where the to-be-tested object is placed to emit light to the preset position.

[0007] Wherein, the multi-angle reflecting prism includes an overall bracket, a first reflecting mirror, a second reflecting mirror, and a third reflecting mirror; the overall bracket is an average three-pronged structure, and the first reflecting mirror, the second reflecting mirror, and the third reflecting mirror are respectively attached to the fork heads of the overall bracket.

[0008] Among them, the overall bracket includes a first bus bar, a second bus bar, and a third bus bar; the included angle between the first bus bar and the second bus bar is 60 degrees, the included angle between the second bus bar and the third bus bar is 60 degrees, and the included angle between the first bus bar and the third bus bar is 60 degrees; among them, the first reflector forms a 18.75-degree clockwise angle with the first bus bar; the second reflector forms a 18.75-degree clockwise angle with the second bus bar; the third reflector forms a 18.75-degree counterclockwise angle with the third bus bar.

[0009] Among them, the camera module is arranged at an angle of 52.5 degrees with respect to the horizontal direction where the translation stage is located.

[0010] Among them, the two fixed reflectors include a first fixed reflector and a second fixed reflector; the first fixed reflector is spaced apart on the side of the light source group away from the translation stage; the second fixed reflector is spaced apart on the side of the multi-angle reflecting prism close to the translation stage.

[0011] Among them, each of the fixed reflectors is arranged at an angle of 52.5 degrees with respect to the horizontal direction where the translation stage is located.

[0012] Among them, the light source group includes a coaxial light source, a low-angle light source, and a high-angle light source; among them, the included angles between the coaxial light source, the low-angle light source, and the high-angle light source and the horizontal direction where the translation stage is located are all different.

[0013] Among them, the translation stage includes: a blanking table, a bearing part, and a driving part; the first end of the bearing part is connected to the blanking table, and the second end of the bearing part is connected to the driving part.

[0014] Among them, the multi-angle imaging device further includes a detection module; the detection module is signal-connected to the camera module and is used to detect the image of the object to be measured taken by the camera module.

[0015] Among them, the multi-angle imaging device further includes a trigger module; the trigger module is signal-connected to the detection module and is respectively connected to the multi-angle reflecting prism and the light source group, so as to control the rotation of the multi-angle reflecting prism and the lighting of the light source group when the detection module detects that an object to be measured appears at the preset position.

[0016] The beneficial effects of the present invention are as follows: Different from the prior art, the multi-angle imaging device of the present invention combines a camera module including a line-scan camera with a multi-angle reflection prism. By using the different angles of reflection of the multi-angle reflection prism on the imaging optical path, multiple-angle imaging of the object to be measured is achieved by the camera module, and the multi-angle images obtained are naturally aligned, naturally avoiding the subsequent alignment step, facilitating synchronous analysis of the multi-angle images, and improving the analysis efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic three-dimensional structure diagram of an embodiment of the multi-angle imaging device of the present invention;

[0019] Figure 2 It is a schematic front view structure diagram of an embodiment of the multi-angle imaging device of the present invention;

[0020] Figure 3 It is a schematic cross-sectional structure diagram of an embodiment of the multi-angle reflection prism;

[0021] Figure 4 It is a schematic optical path imaging diagram of the first embodiment of the multi-angle imaging device;

[0022] Figure 5 It is a schematic optical path imaging diagram of the second embodiment of the multi-angle imaging device;

[0023] Figure 6 It is a schematic optical path imaging diagram of the third embodiment of the multi-angle imaging device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will describe the solutions of the embodiments of the present invention in detail with reference to the accompanying drawings of the specification.

[0025] In the following description, specific details such as specific system structures, interfaces, and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the present invention.

[0026] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "inner" and "outer" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present application. In addition, in the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined. In addition, parameters such as the designed angle of the mirror, the number of mirrors, and the imaging period in the present invention are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have specific parameters, and therefore cannot be construed as a limitation to the present application.

[0028] It should also be noted that unless otherwise clearly specified and defined, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] Please refer to Figure 1-2 , Figure 1 which is a schematic three-dimensional structure diagram of an embodiment of the multi-angle imaging device of the present invention. Figure 2 which is a schematic front view structure diagram of an embodiment of the multi-angle imaging device of the present invention.

[0030] The multi-angle imaging device 100 of this embodiment includes: a translation stage 10, a camera module 50, a multi-angle reflecting prism 20, two fixed mirrors 30, and a light source group 40.

[0031] The translation stage 10 is used to place and move the object to be measured 60 to a preset position 70; the object to be measured 60 includes a circuit board or other products, which are not limited here. The preset position 70 is the area on the translation stage 10 for imaging the object to be measured 60. After the translation stage 10 moves the object to be measured 60 to the preset position 70, the multi-angle imaging device 100 performs multi-angle imaging on the object to be measured 60.

[0032] The camera module 50 is arranged at intervals on one side of the translation stage 10 where the object to be measured 60 is placed, that is, above the translation stage 10, and is inclined with respect to the horizontal direction of the translation stage 10; the camera module 50 is used to collect images of the object to be measured 60 at multiple angles. The camera module 50 may include a single line-scan camera.

[0033] The multi-angle reflecting prism 20 is arranged at intervals on the side of the camera module 50 away from the translation stage 10, and can reflect the imaging light path of the camera module 50 to different angles by its own rotation.

[0034] Two fixed mirrors 30 are arranged at intervals between the translation stage 10 and the multi-angle reflecting prism 20, and are respectively arranged at intervals on the opposite sides of the camera module 50, and are used to connect the light paths reflected by the multi-angle reflecting prism 20.

[0035] The light source group 40 is arranged at intervals on one side of the translation stage 10 where the object to be measured 60 is placed, so as to emit light sources to the preset position 70 to illuminate the preset position 70.

[0036] With the above structure, the multi-angle imaging device of this embodiment combines a camera module including a single line-scan camera with a multi-angle reflecting prism, and uses the different angles of the multi-angle reflecting prism to reflect the imaging light path, so as to realize multi-angle imaging of the object to be measured by the camera module, and the multi-angle images obtained are naturally aligned, naturally avoiding the later alignment step, facilitating synchronous analysis of the multi-angle images, and improving the analysis efficiency and accuracy.

[0037] In other embodiments, the light source group 40 includes a coaxial light source 402, a low-angle light source 404, and a high-angle light source. Among them, the high-angle light source specifically includes a first high-angle light source 401 and a second high-angle light source 403.

[0038] Among them, the angles between the coaxial light source 402, the low-angle light source 404, the first high-angle light source 401, and the second high-angle light source 403 and the translation stage 10 are all different to adapt to the imaging of light paths at different angles.

[0039] Please refer to Figure 3 , Figure 3 is a schematic cross-sectional structure diagram of an embodiment of the multi-angle reflecting prism.

[0040] In other embodiments, the multi-angle reflecting prism 20 includes an integral bracket 204 , a first reflecting mirror 201 , a second reflecting mirror 202 , and a third reflecting mirror 203 .

[0041] The integral bracket 204 is an average three-pronged structure, that is, the integral bracket 204 is distributed in three prongs at an average angle of 120°. The first reflector 201 , the second reflector 202 and the third reflector 203 are respectively attached to the prongs of the integral bracket 204 .

[0042] By rotating the multi-angle reflecting prism 20 , the first reflecting mirror 201 , the second reflecting mirror 202 and the third reflecting mirror 203 are respectively facing the camera module 50 , thereby reflecting the imaging light path of the camera module 50 to different angles.

[0043] In other embodiments, the integral support 204 includes a first busbar 206, a second busbar 205, and a third busbar 207. The angle between the first busbar 206 and the second busbar 205 is 60 degrees, the angle between the second busbar 205 and the third busbar 207 is 60 degrees, and the angle between the first busbar 206 and the third busbar 207 is 60 degrees. The first busbar 206, the second busbar 205, and the third busbar 207 are used to represent the structural trend of the integral support 204, which is a three-pronged average 120-degree distribution.

[0044] The first reflector 201 and the first bus bar 206 are at an angle of 18.75 degrees clockwise; the second reflector 202 and the second bus bar 205 are at an angle of 18.75 degrees clockwise; and the third reflector 203 and the third bus bar 207 are at an angle of 18.75 degrees counterclockwise.

[0045] In other embodiments, the camera module 50 and the translation stage 10 are arranged at an angle of 52.5 degrees to the horizontal direction.

[0046] In other embodiments, the two fixed reflectors 30 include a first fixed reflector 301 and a second fixed reflector 302 .

[0047] The first fixed reflective mirror 301 is disposed at intervals on a side of the light source assembly 40 away from the translation stage 10 ; the second fixed reflective mirror 302 is disposed at intervals on a side of the multi-angle reflecting prism 20 close to the translation stage 10 .

[0048] In a specific application scenario, the coaxial light source 402 is disposed opposite the preset position 70 , and the fixed reflector 301 is spaced apart and disposed on a side of the coaxial light source 402 away from the translation stage 10 .

[0049] In other embodiments, each fixed reflector 30 is disposed at an angle of 52.5 degrees to the horizontal direction of the translation stage 10 .

[0050] By setting the devices at the above angles, three types of optical path imaging are achieved.

[0051] Please refer to Figure 4 , Figure 4 which is a schematic diagram of the optical path imaging of the first embodiment of the multi-angle imaging device.

[0052] When the first reflector 201 participates in imaging, the imaging rays of the camera module 50 sequentially pass through the first reflector 201 and the fixed reflector 301, and perpendicularly shoot at the object to be measured 60. At this time, the coaxial light source 402 is lit. This optical path has the best imaging effect on metals such as gold surfaces and pads.

[0053] Specifically, when the first generatrix 206 corresponding to the first reflector 201 coincides with the rays of the camera module 50, the rays emitted by the camera module 50 shoot at the first reflector 201 at an angle of 52.5°. After reflection, the angle changes by 37.5° and shoots at the fixed reflector 301. After reflection again, it shoots vertically downward at the object to be measured 60 at an angle of 90°. At this time, the coaxial light source 402 is lit, and the emission direction of the coaxial light source 402 also forms an angle of 90° with the horizontal direction.

[0054] Please refer to Figure 5 , Figure 5 which is a schematic diagram of the optical path imaging of the second embodiment of the multi-angle imaging device.

[0055] When the second reflector 202 participates in imaging, the imaging rays of the camera module 50 sequentially pass through the second reflector 202 and the fixed reflector 301, and perpendicularly shoot at the object to be measured 60. At this time, the first high-angle light source 401 and the second high-angle light source 403 are lit. This optical path has the best imaging effect on defects such as dirt in the ink area.

[0056] Specifically, when the second generatrix 205 corresponding to the second reflector 202 coincides with the rays of the camera module 50, the rays emitted by the camera module 50 shoot at the second reflector 202 at an angle of 52.5°. After reflection, the angle changes by 37.5° and shoots at the fixed reflector 301. After reflection again, it shoots vertically downward at the object to be measured 60 at an angle of 90°. At this time, the first high-angle light source 401 and the second high-angle light source 403 are lit, and the emission directions of the first high-angle light source 401 and the second high-angle light source 403 are symmetric with an angle of 75° with the horizontal direction.

[0057] Please refer to Figure 6 , Figure 6 which is a schematic diagram of the optical path imaging of the third embodiment of the multi-angle imaging device.

[0058] When the third reflector 203 participates in imaging, the imaging rays of the camera module 50 sequentially pass through the third reflector 203 and the fixed reflector 302, and obliquely shoot at the object to be measured 60 at a low angle. At this time, the low-angle light source 404 is lit. This optical path has the best imaging effect on defects such as scratches in the ink area.

[0059] Specifically, when the third bus bar 207 corresponding to the third reflecting mirror 203 coincides with the ray of the camera module 50, the ray emitted by the camera module 50 shoots at the third reflecting mirror 203 at an angle of 52.5°. After reflection, the angle changes by 37.5° and shoots at the fixed reflecting mirror 302, and then shoots at the object to be measured 60 at a low angle of 15° after reflection again. At this time, the coaxial light source 404 is lit, and the angle between the emission direction of the coaxial light source 404 and the horizontal direction is also 15°.

[0060] In other embodiments, the multi-angle imaging device 100 further includes a detection module (not shown in the figure); the detection module is signal-connected to the camera module 50 and is used to detect the image of the object to be measured 60 captured by the camera module 50.

[0061] Specifically, the detection module first preprocesses the image, splits each row of an image according to the corresponding imaging angle, recombines it into multiple images with different imaging angles, and performs simple alignment. Then, the detection module processes the multiple images with different imaging angles to identify defects in areas such as the pads and inks of the object to be measured 60. If a defect is identified, the defect result can be fed back to the customer MES system to control the logic of defective product rejection, abnormal alarm, data statistics, etc.

[0062] The detection module can perform image detection based on a trained deep neural model for image detection.

[0063] In other embodiments, the multi-angle imaging device 100 further includes a trigger module (not shown in the figure); the trigger module is signal-connected to the detection module and is respectively connected to the multi-angle reflecting prism 20 and the light source group 40, so as to control the rotation of the multi-angle reflecting prism 20 and the lighting of the light source group 40 when the detection module detects that the object to be measured 60 appears at the preset position 70, and further control the switch of the multi-angle imaging device 100.

[0064] When the multi-angle imaging device 100 operates, the translation stage 10 moves the object to be measured 60 to the preset position 70 at a constant speed. When the detection module detects that the object to be measured 60 appears at the preset position 70, it sends a signal to the trigger module. The trigger module controls the multi-angle reflecting prism 20 to start rotating and the light sources in the light source group 40 to be lit in sequence based on the signal, realizing multi-angle optical path imaging.

[0065] In other embodiments, the translation stage 10 may include: a blanking table (not shown in the figure), a bearing part 11, and a driving part (not shown in the figure); the first end of the bearing part 11 is connected to the blanking table, and the second end of the bearing part 11 is connected to the driving part. The driving part may include driving devices such as a cylinder and a motor.

[0066] The bearing part is used to place the object to be measured 60, and the driving part is used to drive the bearing part to realize the stable movement of the object to be measured thereon.

[0067] In other embodiments, the translation stage 10 may further include components such as a translation module, a servo motor, a stepper motor, an encoder, and a pneumatic adsorption device, to maintain a stable and uniform speed during the movement of the object to be measured 60. At the same time, it can communicate with the MES system when the object to be measured 60 enters and leaves the preset position 70 to complete the start and end processes.

[0068] With the above structure, the multi-angle imaging device of this embodiment combines a camera module including a line scan camera with a multi-angle reflection prism. By using the different angles of reflection of the imaging light path by the multi-angle reflection prism, it realizes multi-angle imaging of the object to be measured using one camera, and the multi-angle images obtained are naturally aligned, naturally avoiding the subsequent alignment step, facilitating synchronous analysis of the multi-angle images, being applicable to defect detection of the object to be measured, and improving the detection efficiency and accuracy of defect detection.

[0069] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A multi-angle imaging device, characterized in that, The multi-angle imaging device includes: A translation stage for placing and moving the object to be measured to a preset position; A camera module, which is spaced on one side of the translation stage where the object to be measured is placed and is inclined with respect to the horizontal direction of the translation stage; A multi-angle reflecting prism, which is spaced on the side of the camera module away from the translation stage; the multi-angle reflecting prism includes an integral bracket, a first reflector, a second reflector and a third reflector; the integral bracket is an average three-pronged structure, and the first reflector, the second reflector and the third reflector are respectively attached to the fork heads of the integral bracket; wherein, the integral bracket includes a first generatrix, a second generatrix and a third generatrix; the angle between the first generatrix and the second generatrix is 60 degrees, the angle between the second generatrix and the third generatrix is 60 degrees, and the angle between the first generatrix and the third generatrix is 60 degrees; wherein, the first reflector forms a 18.75-degree clockwise angle with the first generatrix; the second reflector forms a 18.75-degree clockwise angle with the second generatrix; the third reflector forms a 18.75-degree counterclockwise angle with the third generatrix; Two fixed reflectors, which are spaced between the translation stage and the multi-angle reflecting prism and are respectively arranged on opposite sides of the camera module; A light source group, which is spaced on one side of the translation stage where the object to be measured is placed to emit light sources to the preset position.

2. The multi-angle imaging device according to claim 1, wherein The camera module is arranged at an angle of 52.5 degrees with respect to the horizontal direction where the translation stage is located.

3. The multi-angle imaging device according to claim 1, characterized in that The two fixed reflectors include a first fixed reflector and a second fixed reflector; The first fixed reflector is spaced on the side of the light source group away from the translation stage; The second fixed reflector is spaced on the side of the multi-angle reflecting prism close to the translation stage.

4. The multi-angle imaging device according to claim 1, wherein Each of the fixed reflectors is arranged at an angle of 52.5 degrees with respect to the horizontal direction where the translation stage is located.

5. The multi-angle imaging device according to claim 1, wherein The light source group includes a coaxial light source, a low-angle light source and a high-angle light source; Wherein, the angles between the coaxial light source, the low-angle light source and the high-angle light source and the horizontal direction where the translation stage is located are all different.

6. The multi-angle imaging device according to claim 1, wherein The translation stage includes: a blanking table, a bearing part and a driving part; The first end of the bearing part is connected to the blanking table, and the second end of the bearing part is connected to the driving part.

7. The multi-angle imaging device according to claim 1, wherein The multi-angle imaging device further includes a detection module; The detection module is signal-connected to the camera module for detecting the image of the object to be measured captured by the camera module.

8. The multi-angle imaging device according to claim 7, wherein The multi-angle imaging device further includes a trigger module; The trigger module is signal-connected to the detection module and is respectively connected to the multi-angle reflecting prism and the light source group to control the rotation of the multi-angle reflecting prism and the lighting of the light source group when the detection module detects that an object to be measured appears at the preset position.

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