Detection device

Abstract

The invention provides a detection device, which comprises a light source part used for emitting polarized light on a to-be-detected surface of a to-be-detected piece; the image acquisition part comprises an imaging unit and a polarized lens, the polarized lens covers the image acquisition end of the imaging unit, and the imaging unit is used for acquiring detection image information of the to-be-detected surface under the irradiation of the polarized light through the polarized lens; wherein the polarized lens is rotatably connected to the image acquisition end, so that the direction of a light-transmitting axis of the polarized lens is adjustable. The detection device can reduce background texture imaging in the detection image information and weaken the influence of background textures on the imaging effect of actual defects, so that in the process of judging the defect condition of the to-be-detected surface according to the detection image information, the accuracy of a judgment result is ensured, the probability of false detection and missing detection is reduced, and the detection efficiency is improved. And a guarantee is provided for the production yield.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of visual detection, and particularly relates to a detection device. BACKGROUND

[0002] In the production process of electronic products, at least part of the components of the products usually need to be subjected to appearance detection to screen out components with appearance defects. In the prior art, an AOI (Automated Optical Inspection) device is usually used to collect appearance images of the components, and whether the corresponding components have appearance defects is judged based on the collected appearance images.

[0003] However, as the requirement for the appearance of products is increasingly improved, the surface background texture design of product outer decoration parts such as mobile phone back covers is increasingly diversified and complicated, so that the detection device is also easy to simultaneously image the background texture and actual defects of the corresponding surface when collecting the surface images of the foregoing outer decoration parts, which leads to the difficulty in identifying the defects in the images and is not conducive to ensuring the accuracy of the detection results. SUMMARY

[0004] The present disclosure aims to at least solve one of the problems in the prior art or related art.

[0005] Therefore, according to an embodiment of the present disclosure, a detection device is provided, which comprises: A light source part configured to emit polarized light to a detection surface of a detection piece; An image collection part comprising an imaging unit and a polarized lens, the polarized lens being arranged on an image collection end of the imaging unit, and the imaging unit being configured to collect detection image information of the detection surface under the irradiation of the polarized light through the polarized lens; The polarized lens is rotatably connected to the image collection end, so that the direction of the light transmission axis of the polarized lens is adjustable.

[0006] In a possible implementation, the polarized lens has a polarized ratio greater than or equal to 10 5 :1.

[0007] In a possible implementation, the light source part comprises a linear polarized light source, and the polarized lens comprises a linear polarized lens.

[0008] In a possible implementation, the light source part is configured to emit the polarized light to the detection surface along a target incident direction, and the target incident direction has an included angle greater than 0° and less than or equal to 45° with respect to the normal of the detection surface.

[0009] In a possible implementation, the thickness direction of the polarized lens is parallel to the optical axis direction of the imaging unit, and the rotation axis of the polarized lens coincides with the optical axis of the imaging unit.

[0010] In an implementation, the imaging unit comprises: a linear array camera; a line-scan lens, one end of the line-scan lens is arranged at the linear array camera, and the other end is configured as an image acquisition end.

[0011] In an implementation, the detection device further comprises: a conveying unit, configured to drive the to-be-detected member to move along a target moving direction, the target moving direction intersecting the scanning direction of the linear array camera.

[0012] In an implementation, the target moving direction is perpendicular to the scanning direction of the linear array camera.

[0013] In an implementation, the conveying unit comprises: a plurality of conveying rollers, the plurality of conveying rollers are arranged along the target moving direction, and the roller surfaces of the conveying rollers are configured to rollingly cooperate with a side of the to-be-detected member away from the to-be-inspected surface.

[0014] In an implementation, the detection device further comprises: a first control unit, signal-connected to the linear array camera and the conveying unit, and configured to control the linear array camera and the conveying unit to operate.

[0015] In an implementation, the first control unit comprises: a first control module, signal-connected to the linear array camera, and configured to control a scanning rate of the linear array camera; a second control module, signal-connected to the conveying unit, and configured to control the conveying unit to drive the to-be-detected member to move at a preset moving speed, the direction of the preset moving speed being consistent with the target moving direction; wherein the preset moving speed is positively correlated with the scanning rate of the linear array camera.

[0016] In an implementation, the scanning rate of the linear array camera is greater than or equal to 5700 rows / s and less than or equal to 9000 rows / s; the preset moving speed is greater than or equal to 70 mm / s and less than or equal to 110 mm / s.

[0017] In an implementation, the detection device further comprises: a second control unit, signal-connected to the light source unit, and configured to control the light source unit to emit polarized light to the to-be-inspected surface when the to-be-inspected surface is located within a field of view range of the imaging unit.

[0018] In an implementation, the detection device further comprises: a processing unit, signal-connected to the imaging unit, and configured to determine defect condition information of the to-be-inspected surface according to the detection image information.

[0019] In an implementation, the detection device further comprises: a warning unit connected to the processing unit, the warning unit configured to generate a warning information when the surface under test has a defect.

[0020] In an implementation, the detection device further comprises: a sorting unit connected to the processing unit, the sorting unit configured to transfer the piece under test to a defective product collection device when the surface under test has a defect, or to transfer the piece under test to a good product collection device when the surface under test has no defect.

[0021] In an implementation, the number of polarized lenses is multiple, and the multiple polarized lenses are alternatively arranged on the image acquisition end.

[0022] In an implementation, the detection device further comprises: a driving unit connected to the polarized lens, for driving the polarized lens to rotate.

[0023] In an implementation, the driving unit comprises: a servo motor; a transmission mechanism connected between the servo motor and the polarized lens, the servo motor being configured to drive the polarized lens to rotate through the transmission mechanism.

[0024] In an implementation, the image acquisition unit further comprises: a locking member having a locked state and an unlocked state; wherein, in the locked state, the locking member restricts the polarized lens from rotating relative to the image acquisition end; and in the unlocked state, the polarized lens can rotate relative to the image acquisition end.

[0025] The above description is only a summary of the technical solutions provided by the present disclosure. In order to enable one skilled in the art to better understand the technical means of the present disclosure, the content of the specification can be implemented, and in order to make the above and other characteristics and effects of the present disclosure more apparent and easy to understand, the following embodiments of the present disclosure are described. BRIEF DESCRIPTION OF DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are included to provide a description of exemplary embodiments and are not meant to limit the present disclosure. Moreover, the same reference numerals in the attached drawings indicate the same or similar components. In the drawings: Figure 1 a schematic structural diagram of a detection device according to an embodiment of the present disclosure; Figure 2The detection device of one embodiment provided by the present disclosure and the schematic use effect analogy diagram of the detection device in the first scenario of the prior art are compared. Figure 3 The detection device of one embodiment provided by the present disclosure and the schematic use effect analogy diagram of the detection device in the second scenario of the prior art are compared.

[0027] Wherein, Figure 1 The correspondence between the reference signs and the component names in the drawings is as follows: 100, detection device; 110, light source part; 120, image acquisition part; 121, imaging unit; 121a, linear array camera; 121b, line scanning lens; 122, polarizing lens; 130, conveying part; 131, conveying roller; 140, first control part; 1211, image acquisition end; 200, piece to be detected; 201, surface to be detected. DETAILED DESCRIPTION

[0028] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0029] It should be noted that in the production process of electronic products, at least part of the components of the product usually need to be detected in appearance to screen out components with appearance defects. In the prior art, an AOI device is usually used to acquire the appearance image of the component, and whether the corresponding component has an appearance defect is judged based on the acquired appearance image.

[0030] However, as the requirement for product aesthetics is increasingly improved, the surface background texture design of product outer decoration parts such as mobile phone back covers is increasingly diversified and complicated. Since the detection device in the prior art directly images the detected piece, the detection device is also likely to image the background texture and actual defects of the corresponding surface at the same time when acquiring the surface image of the aforementioned outer decoration part, which makes it difficult to identify the defects in the image and is not conducive to ensuring the accuracy of the detection result.

[0031] In view of this, as Figures 1 to 3As shown, according to the embodiment of the present disclosure, a detection device 100 is provided, comprising: a light source part 110, configured to emit polarized light to a detection surface 201 of a detection piece 200; an image acquisition part 120, comprising an imaging unit 121 and a polarized lens 122, the polarized lens 122 is arranged on an image acquisition end 1211 of the imaging unit 121, and the imaging unit 121 is configured to acquire detection image information of the detection surface 201 under the irradiation of the polarized light through the polarized lens 122; wherein the polarized lens 122 is rotationally connected to the image acquisition end 1211, so that the direction of the light transmission axis of the polarized lens 122 is adjustable.

[0032] The detection device 100 provided by the embodiment of the present disclosure comprises a light source part 110 and an image acquisition part 120. The image acquisition part 120 comprises an imaging unit 121 and a polarized lens 122. The imaging unit 121 can receive light reflected by an object through an image acquisition end 1211 and process the light received by the image acquisition end 1211 to obtain image information of the object. The polarized lens 122 is arranged on the imaging unit 121 and covers the image acquisition end 1211. Therefore, when the image acquisition part 120 collects image information of an object, the polarized lens 122 can be used to filter the reflected light that is incident on the image acquisition end 1211, so that the image acquisition end 1211 receives reflected light whose vibration direction is the same as or approximately the same as the light transmission axis direction of the polarized lens 122. The polarized lens 122 is rotationally connected to the image acquisition end 1211. Therefore, during use, the imaging unit 121 can image an object based on reflected light of different polarization directions by rotating the polarized lens 122. In actual application, the light source part 110 is used to emit polarized light to a detection surface 201 of a detection piece 200. Correspondingly, when the light source part 110 emits polarized light to the detection surface 201, the detection surface 201 can reflect the polarized light. The imaging unit 121 is used to collect detection image information of the detection surface 201 under the irradiation of the polarized light through the polarized lens 122. Because the polarization state of the polarized light changes before and after reflection, and the change of the polarization state is related to the medium of the reflecting surface, there is a large difference in polarization direction between the polarized light reflected by the background texture of the detection surface 201 and the polarized light reflected by the defect part of the detection surface 201. Based on this, during use, the detection device 100 provided by the embodiment of the present disclosure can adjust the light transmission axis direction of the polarized lens 122 by rotating the polarized lens 122 in combination with the surface characteristics of the detection surface 201, so that the polarized lens 122 can filter at least part of the polarized light reflected by the background texture of the detection surface 201. Therefore, the imaging of the background texture in the detection image information can be reduced, the influence of the imaging effect of the background texture on the actual defect can be weakened, and then the accuracy of the judgment result can be ensured, the probability of false detection and missed detection can be reduced, and the production yield can be ensured.

[0033] It should be noted that the detection device 100 provided by the embodiment of the present disclosure can be used for, but is not limited to, appearance detection of electronic product parts in actual application. The electronic product can be, but is not limited to, 3C (Computer / Communication / Consumer; computer, communication, and consumer) electronic products such as mobile phones, tablet computers, notebook computers, and digital cameras. Correspondingly, the detection piece 200 can be, but is not limited to, an outer decoration part of an electronic product such as a mobile phone back cover, a tablet computer back cover, and a notebook computer shell.

[0034] Taking the aforementioned detection device 100 as an example when applied to the appearance inspection of a mobile phone back cover, the aforementioned surface to be inspected 201 can be one side of the thickness direction of the mobile phone back cover. Before acquiring the aforementioned inspection image information, the detection device 100 can be adjusted. The aforementioned adjustment process includes adjusting the transmission axis direction of the polarizing lens 122 according to the surface characteristics of the surface to be inspected 201, so that the adjusted polarizing lens 122 can filter out at least part of the polarized light reflected by the background texture of the surface to be inspected 201, thereby reducing the imaging of the background texture in the inspection image information and weakening the influence of the background texture on the imaging effect of the actual defect; the aforementioned surface characteristics include the material, color, and texture type of the surface to be inspected 201.

[0035] For example, during the process of adjusting the transmission axis direction of the polarizing lens 122 according to the surface characteristics of the surface to be inspected 201, a test sample can be selected first based on the surface characteristics of the surface to be inspected 201. The test sample has a test reference surface, the surface characteristics of which are the same as those of the surface to be inspected 201. Multiple different detection angle positions can be selected based on the rotation angle range of the polarizing lens 122 on the image acquisition end 1211. It is understood that the detection angle positions do not exceed the rotation angle range, and the transmission axis direction of the polarizing lens 122 changes with the change in the detection angle position. Then, the light source unit 110 can be controlled to emit polarized light onto the test reference surface. The polarizing lens 122 is rotated to be positioned sequentially at one of the aforementioned detection angle positions. Correspondingly, when the polarizing lens 122 is at each of the aforementioned detection angle positions, the imaging unit 121 is controlled to acquire reference image information of the reference surface under the aforementioned polarized light illumination. After acquiring the reference image information corresponding to each detection angle position, the detection angle position corresponding to the reference image information with the smallest gray value variance can be selected as the target angle position of the polarizing lens 122. When the detection device 100 subsequently acquires detection image information of the surface 201 to be inspected, the polarizing lens 122 can be set to be at the aforementioned target angle position.

[0036] It is understandable that the smaller the grayscale variance of the image information acquired by the imaging unit 121, the more uniform the corresponding image background, and the lower the visibility of the background texture of the surface under inspection 201 or the debugging reference surface in the image. Correspondingly, this also indicates that the polarizing lens 122 filters out more polarized light reflected by the background texture of the surface under inspection 201. Based on this, by setting the polarizing lens 122 to the aforementioned target angle position when the detection device 100 subsequently acquires the detection image information of the surface under inspection 201, the polarizing lens 122 can filter out more polarized light reflected by the background texture of the surface under inspection 201, thereby reducing the imaging of background texture in the detection image information and weakening the influence of background texture on the imaging effect of actual defects.

[0037] It is understood that the process of adjusting the transmission axis direction of the polarizing lens 122 according to the surface characteristics of the surface to be inspected 201 is not limited to the process provided in the above example. In practical applications, other adjustment methods can also be adopted so that the polarizing lens 122 can filter out at least part of the polarized light reflected by the background texture of the surface to be inspected 201.

[0038] Understandably, in practical applications, the target detection positions determined in each debugging process can be recorded, so that when performing appearance inspection on the workpiece 200 with the same surface features in the future, the corresponding target detection positions can be directly called, which helps to reduce the amount of debugging work.

[0039] It is understandable that the aforementioned polarizing lens 122 maintains its coverage of the image acquisition end 1211 during rotation, thereby ensuring the filtering effect of the polarizing lens 122.

[0040] like Figure 2 As shown, Figure 2 The image pointed to by the middle arrow A1 is a partial surface image of a mobile phone back cover acquired by the detection device 100 in the prior art, and the image pointed to by the arrow B1 is a partial surface image of a mobile phone back cover acquired by the detection device 100 proposed in this disclosure. The images pointed to by the arrow A1 and the images pointed to by the arrow B1 correspond to the same part of the same mobile phone back cover. It is not difficult to see that, compared with the image pointed to by the arrow A1, the image pointed to by the arrow B1 has better background uniformity and a lower degree of display of the background texture of the mobile phone back cover.

[0041] like Figure 3 As shown, Figure 3The image pointed to by arrow A2 is a partial surface image of a mobile phone back cover acquired by the detection device 100 in the prior art, and the image pointed to by arrow B2 is a partial surface image of a mobile phone back cover acquired by the detection device 100 proposed in this disclosure. The images pointed to by arrow A2 and arrow B2 correspond to the same part of the same mobile phone back cover. Figure 2 The bright area circled by the dotted line D is the defective part of the phone's back cover. Figure 3 It is easy to see that, compared with the detection device 100 in the prior art, the detection device 100 proposed in this disclosure acquires images that display defects more clearly, which can reduce the probability that the actual defects of the mobile phone back cover are buried by the background texture, and help improve the accuracy of the detection results.

[0042] In some examples, the polarizing ratio of polarizing lens 122 is greater than or equal to 105:1.

[0043] In this technical solution, the polarization ratio (also known as the extinction ratio) of the polarizing lens 122 is constrained. Based on the aforementioned settings, the detection device 100 may include a polarizing lens 122 with a high polarization ratio, thereby enhancing the accuracy of the polarizing lens 122, improving the filtering effect of the polarizing lens 122, and enabling the polarizing lens 122 to more reliably filter out polarized light reflected from the background texture of the surface under inspection 201 during the detection process, reducing the imaging of background texture in the detection image information, and further weakening the influence of background texture on the imaging effect of actual defects.

[0044] The polarization ratio of the polarizing lens 122 can be, but is not limited to, 105:1, 106:1 or 107:1.

[0045] In some examples, the light source 110 includes a linearly polarized light source, and the polarizing lens 122 includes a linearly polarizing plate.

[0046] In this technical solution, the aforementioned light source 110 may include a linearly polarized light source, and the aforementioned polarizing lens 122 may include a linearly polarizing plate. Based on the aforementioned configuration, the light source 110 can emit linearly polarized light from the surface 201 under inspection using a linearly polarized light source. The polarizing lens 122 can filter the linearly polarized light reflected from the surface 201 under inspection using a linearly polarizing filter. The vibration direction of the linearly polarized light is singular, and the background texture is usually more regular and uniform than the defect area. Therefore, the linearly polarized light reflected from the background texture often has a relatively singular polarization direction, while the polarization direction of the linearly polarized light reflected from the defect area is relatively chaotic. Consequently, after the linearly polarized light emitted by the light source 110 is reflected by the surface 201 under inspection, the linearly polarized light reflected from the background texture and the linearly polarized light reflected from the defect area are more likely to form a large difference in polarization state. This is beneficial for the polarizing lens 122 to specifically filter out the polarized light reflected from the background texture of the surface 201 under inspection and to increase the probability of the linearly polarized light reflected from the defect area passing through the polarizing lens 122. This can further reduce the imaging of background texture in the inspection image information and weaken the influence of background texture on the imaging effect of the actual defect, providing a more reliable guarantee for the accuracy of the judgment result.

[0047] like Figure 1 As shown, in some examples, the light source unit 110 is configured to emit polarized light rays along the target incident direction C2 to the surface under inspection 201, and the angle α between the target incident direction C2 and the normal of the surface under inspection 201 is greater than 0° and less than or equal to 45°.

[0048] In this technical solution, the direction of the polarized light emitted by the light source 110 is constrained. Based on the aforementioned arrangement, the propagation direction of the polarized light emitted by the light source 110 is inclined to the surface under inspection 201. Correspondingly, most of the polarized light reflected from the surface under inspection 201 will also propagate along the direction inclined to the surface under inspection 201. Therefore, in practical applications, it is convenient to arrange the light source 110 and the image acquisition unit 120 in a staggered manner along the extension direction of the surface under inspection 201, and it is convenient to set the arrangement position of the light source 110 and the image acquisition unit 120 according to the propagation path of the polarized light, reducing the layout difficulty of the light source 110 and the image acquisition unit 120. Furthermore, by limiting the aforementioned included angle α to less than or equal to 45°, it is also possible to avoid the incident angle of the polarized light on the surface under inspection 201 being too large, which can reduce the distance between the light source 110 and the incident point, thus helping to ensure the illumination effect of the light source 110 on the surface under inspection 201 and the image quality acquired by the image acquisition unit 120.

[0049] It should be noted that, Figure 1The center line C1 is used to schematically represent the optical axis direction of the imaging unit 121. In practical applications, the optical axis direction C1 of the imaging unit 121 and the aforementioned target incident direction C2 can be mirror-symmetric about the normal of the surface under inspection 201, so that the line scan camera 121a can receive the reflected light from the surface under inspection 201 through the line scan lens 121b. Figure 1 The direction Z in the diagram can be used to indicate a direction parallel to the normal of the surface 201 to be inspected.

[0050] For example, the aforementioned included angle α can be, but is not limited to, 5°, 10°, 20°, 30° or 45°.

[0051] like Figure 1 As shown, in some examples, the thickness direction of the polarizing lens 122 is parallel to the optical axis direction C1 of the imaging unit 121, and the rotation axis of the polarizing lens 122 coincides with the optical axis of the imaging unit 121.

[0052] In this technical solution, the thickness direction of the polarizing lens 122 can be set parallel to the optical axis C1 of the imaging unit 121, and the rotation axis of the polarizing lens 122 coincides with the optical axis of the imaging unit 121. Based on the aforementioned settings, during the rotation of the polarizing lens 122, it is possible to prevent the polarizing lens 122 from deviating from the image acquisition end 1211, which helps to ensure the coverage effect of the polarizing lens 122 on the image acquisition end 1211, thereby preventing the image acquisition end 1211 from receiving light that has not been filtered by the polarizing lens 122.

[0053] like Figure 1 As shown, in some examples, the imaging unit 121 includes: a line scan camera 121a; a line scan lens 121b, one end of which is disposed on the line scan camera 121a, and the other end is configured as an image acquisition end 1211.

[0054] In this technical solution, the imaging unit 121 may include the aforementioned line scan camera 121a and line scan lens 121b. Based on the aforementioned configuration, the imaging unit 121 can use the line scan camera 121a and line scan lens 121b to acquire the aforementioned detection image information by scanning the surface 201 to be inspected line by line, which is beneficial to improving the accuracy and resolution of the detection image information and can provide a more reliable guarantee for the accuracy of the detection results.

[0055] It is understood that when the imaging unit 121 includes the aforementioned line scan camera 121a and line scan lens 121b, during the process of acquiring the aforementioned detection image information, the image acquisition unit 120 can be set to move relative to the surface 201 to be inspected, and the direction of the aforementioned relative movement intersects with the scanning direction of the line scan camera 121a, thereby facilitating the imaging unit 121 to perform line-by-line scanning of the surface 201 to be inspected.

[0056] likeFigure 1 As shown, in some examples, the detection device 100 further includes a transport unit 130 for driving the object to be detected 200 to move along the target movement direction X, which intersects the scanning direction of the line scan camera 121a.

[0057] In this technical solution, the detection device 100 may further include the aforementioned conveying unit 130. Based on the aforementioned configuration, the detection device 100 can use the conveying unit 130 to drive the surface to be inspected 201 to move stably along the target movement direction X, thereby facilitating the imaging unit 121 to perform line-by-line scanning of the surface to be inspected 201 to achieve the acquisition of the aforementioned detection image information, which is beneficial to improving the ease of use of the detection device 100.

[0058] Understandably, in practical applications, the target movement direction X and the scanning direction of the line scan camera 121a can be set as two intersecting directions that are both parallel to the surface 201 to be inspected.

[0059] like Figure 1 As shown, in some examples, the target movement direction is perpendicular to the scanning direction of the line scan camera 121a.

[0060] In this technical solution, the target movement direction can be set to be perpendicular to the scanning direction of the line scan camera 121a, which can avoid the phenomenon of oblique distortion in the detection image, which is conducive to restoring the shape of the surface 201 under inspection in the detection image, and facilitates the location of the defect when judging the defect status of the surface 201 under inspection based on the detection image information.

[0061] It is understandable that the aforementioned detection image is obtained based on the detection image information acquired by the imaging unit 121.

[0062] like Figure 1 As shown, in some examples, the conveying unit 130 includes a plurality of conveying rollers 131 arranged along the target movement direction X, and the roller surface of the conveying rollers 131 is used for rolling engagement with the side of the workpiece 200 opposite to the surface 201 to be inspected.

[0063] In this technical solution, the conveying unit 130 may include a plurality of the aforementioned conveying rollers 131. Based on the aforementioned configuration, the conveying unit 130 can use the conveying rollers 131 to drive the workpiece 200 to be inspected to translate along the aforementioned target movement direction X, thereby facilitating the imaging unit 121 to scan the surface 201 to be inspected line by line to achieve the acquisition of the aforementioned detection image information; and the conveying rollers 131 can drive the workpiece 200 to be inspected to translate by rolling with the side of the workpiece 200 away from the surface 201 to be inspected, which on the one hand can avoid the conveying unit 130 from blocking the surface 201 to be inspected, thereby ensuring that the interference of the conveying unit 130 on the acquisition of detection image information is reduced, and on the other hand can also reduce the friction between the workpiece 200 to be inspected and the conveying unit 130, reducing the risk of scratches on the surface of the workpiece 200.

[0064] It is understood that the axes of the multiple conveying rollers 131 are arranged in parallel, and the conveying rollers 131 are configured to rotate about their own axes. The scanning direction of the aforementioned line scan camera 121a can be parallel to the axial direction of the conveying rollers 131. The conveying unit 130 may also include a driving member for driving the conveying rollers 131 to rotate.

[0065] like Figure 1 As shown, in some examples, the detection device 100 further includes a first control unit 140, which is signal-connected to the line scan camera 121a and the conveying unit 130. The first control unit 140 is used to control the operation of the line scan camera 121a and the conveying unit 130.

[0066] In this technical solution, the detection device 100 may further include the aforementioned first control unit 140. Based on the aforementioned configuration, the detection device 100 can utilize the first control unit 140 to control the operation of the line scan camera 121a and the conveying unit 130, thereby improving the convenience of start-stop control and operation parameter adjustment of the line scan camera 121a and the conveying unit 130, which is beneficial to improving the ease of use of the detection device 100.

[0067] It is understood that the aforementioned signal connection method can be either a wired signal connection or a wireless signal connection, and the specific method can be set according to actual needs. No further restrictions will be imposed here.

[0068] In some examples, the first control unit 140 includes: a first control module connected to the line scan camera 121a, the first control module being used to control the scanning rate of the line scan camera 121a; and a second control module connected to the transport unit 130, the second control module being used to control the transport unit 130 to drive the object to be tested 200 to move at a preset moving speed, the direction of the preset moving speed being consistent with the target moving direction; wherein, the preset moving speed is positively correlated with the scanning rate of the line scan camera 121a.

[0069] In this technical solution, the first control unit 140 may include the aforementioned first control module and second control module. Based on the aforementioned configuration, the first control unit 140 can control the scanning rate of the line scan camera 121a and the driving rate of the transport unit 130 on the workpiece 200 to be inspected through the first control module and the second control module, respectively. Furthermore, the moving speed of the workpiece 200 in the target moving direction can be positively correlated with the aforementioned scanning rate. Thus, when one of the aforementioned scanning rate and the aforementioned preset moving speed increases or decreases, the first control unit 140 can also control the other of the aforementioned scanning rate and the aforementioned preset moving speed to make corresponding adjustments. This avoids excessive stretching or compression of the inspection image, which is beneficial for restoring the shape of the inspected surface in the inspection image, ensuring the quality of the inspection image information acquisition, and facilitating the location of defective parts when subsequently judging the defect status of the inspected surface 201 based on the inspection image information.

[0070] In some examples, the scanning rate of the line scan camera 121a is greater than or equal to 5700 lines / s and less than or equal to 9000 lines / s; the preset movement speed is greater than or equal to 70 mm / s and less than or equal to 110 mm / s.

[0071] In this technical solution, the range of values ​​for the aforementioned scanning rate and preset moving speed is constrained. Based on the aforementioned settings, the matching between the aforementioned scanning rate and preset moving speed can be improved, avoiding stretching or compression of the detected image and ensuring the detection image's ability to reproduce the shape of the inspected surface.

[0072] It is understood that the aforementioned scanning rate may be, but is not limited to, 5700 lines / s, 6500 lines / s, 7200 lines / s, 8000 lines / s, or 9000 lines / s; and the aforementioned preset moving speed may be, but is not limited to, 70mm / s, 80mm / s, 90mm / s, 100mm / s, or 110mm / s. For example, the aforementioned scanning rate may be 7500 lines / s, and the aforementioned preset moving speed may be 90mm / s.

[0073] In some examples, the detection device 100 further includes a second control unit connected to the light source unit 110. The second control unit is used to control the light source unit 110 to emit polarized light from the surface to be inspected 201 when the surface to be inspected 201 is within the field of view of the imaging unit 121.

[0074] In this technical solution, the detection device 100 may further include the aforementioned second control unit. Based on the aforementioned configuration, when the surface to be inspected 201 enters the field of view of the imaging unit 121, the detection device 100 can control the light source unit 110 to automatically illuminate via the second control unit to emit polarized light from the surface to be inspected 201, thereby providing an illumination environment for the acquisition of the aforementioned detection image information. This can further improve the automation level and ease of use of the detection device 100, and facilitate the polarizing lens 122 to filter out at least part of the polarized light reflected by the background texture during the acquisition process, reducing the imaging of the background texture.

[0075] Understandably, in practical applications, the first control unit 140 and the second control unit can be assembled as a single unit, thereby improving the integration and structural compactness of the control system of the detection device 100.

[0076] For example, the second control unit is also configured to control the light source unit 110 to turn off when there is no surface 201 to be inspected within the field of view of the imaging unit 121, thereby reducing the operating energy consumption of the detection device 100.

[0077] In some examples, the detection device 100 further includes a processing unit connected to the imaging unit 121, which is used to determine the defect status information of the surface 201 to be inspected based on the detection image information.

[0078] In this technical solution, the detection device 100 may further include the aforementioned processing unit. Based on the aforementioned configuration, the detection device 100 can use the processing unit to analyze and process the aforementioned detection image information, thereby determining whether there are defects on the surface 201 to be inspected, so as to facilitate the screening of defective products and ensure the production quality of the products.

[0079] It is understood that, based on the aforementioned settings of the detection device 100, during the process of acquiring detection image information, since the polarized light reflected by the background texture can be filtered by the polarizing lens 122, the detection device 100 can reduce the influence of background texture imaging on defect identification. Therefore, in practical applications, the aforementioned algorithm for determining the defect status information of the surface to be inspected 201 based on the detection image information can adopt, but is not limited to, algorithms in the prior art. The specific algorithm can be selected according to actual needs, which will not be elaborated here.

[0080] It is understood that the aforementioned defect information may include, but is not limited to, the presence of defects (e.g., whether a defect exists or not), the location of defects, and the type of defects (e.g., scratches, dents, etc.).

[0081] Understandably, in practical applications, the first control unit 140, the second control unit, and the processing unit can be assembled as a single unit.

[0082] In some examples, the detection device 100 further includes an alert unit connected to the processing unit, the alert unit being configured to generate an alert message in the event of a defect on the surface 201 to be inspected.

[0083] In this technical solution, the detection device 100 may further include the aforementioned warning unit. Based on the aforementioned configuration, when the processing unit determines that there is a defect on the surface 201 to be inspected based on the aforementioned detection image information, the detection device 100 can issue a warning message through the warning unit to remind on-site personnel to re-inspect or collect the corresponding part 200 to be inspected, which is beneficial to improving the processing efficiency of defective products.

[0084] It should be noted that the aforementioned warning information may include, but is not limited to, acoustic warning information (e.g., voice broadcast, warning sound effects, etc.) or optical warning information (e.g., warning lights, text displays, etc.). Accordingly, the aforementioned warning unit may include, but is not limited to, a buzzer, a speaker, a display screen, a warning light, etc.

[0085] In some feasible examples, the inspection device 100 further includes a sorting unit, signal-connected to the processing unit, configured to transfer the inspection piece 200 to a defective product collection device if a defect exists on the surface 201 to be inspected; or to transfer the inspection piece 200 to a good product collection device if no defect exists on the surface 201 to be inspected.

[0086] In this technical solution, the detection device 100 may further include the aforementioned sorting unit. Based on the aforementioned configuration, after the processing unit judges the defect status of the workpiece 200 to be inspected, the detection device 100 can use the sorting unit to perform a transfer operation between good and defective products according to the detection results, thereby facilitating the classification and processing of good and defective products and improving the execution efficiency of product production operations.

[0087] For example, the aforementioned sorting unit may include a robotic arm.

[0088] In some examples, there are multiple polarizing lenses 122, which can be interchangeably overlaid on the image acquisition end 1211.

[0089] In this technical solution, the detection device 100 may include a plurality of the aforementioned polarizing lenses 122, and the plurality of polarizing lenses 122 are replaceably covered on the image acquisition end 1211, thereby facilitating the maintenance and replacement of the polarizing lenses 122 during use, improving the cleanliness of the polarizing lenses 122, and helping to ensure the acquisition quality of the detection image information.

[0090] In some examples, the detection device 100 further includes a drive unit connected to the polarizing lens 122 for driving the polarizing lens 122 to rotate.

[0091] In this technical solution, the detection device 100 may further include the aforementioned driving unit. Based on the aforementioned configuration, the detection device 100 can rotate the polarizing lens 122 via the driving unit, thereby reducing the need for manual operation during use and lowering the risk of dirt and damage to the polarizing lens 122 during use. This improves the ease of use of the detection device 100 and reduces the maintenance cost of the image acquisition unit 120.

[0092] In some examples, the drive unit includes: a servo motor; and a transmission mechanism that is connected between the servo motor and the polarizing lens 122, wherein the servo motor is used to drive the polarizing lens 122 to rotate via the transmission mechanism.

[0093] In this technical solution, the drive unit may include the aforementioned servo motor and transmission mechanism. Based on the aforementioned configuration, the drive unit can use the servo motor to provide power for the rotation of the polarizing lens 122, and can improve the angular displacement accuracy of the polarizing lens 122 during the rotation process. This is beneficial to improving the positional accuracy of the detection device 100 during the image acquisition process, thereby ensuring the image acquisition quality. Furthermore, the servo motor can drive the polarizing lens 122 to rotate through the transmission mechanism, which can further improve the rotational stability of the polarizing lens 122.

[0094] It is understandable that the aforementioned transmission mechanism can have various transmission methods, such as gear transmission, belt transmission, or chain transmission, etc. The specific method can be set according to actual needs, and no further restrictions are imposed here.

[0095] In some examples, the image acquisition unit 120 further includes a locking member having a locked state and an unlocked state; wherein, in the locked state, the locking member restricts the polarizing lens 122 from rotating relative to the image acquisition end 1211; and in the unlocked state, the polarizing lens 122 can rotate relative to the image acquisition end 1211.

[0096] In this technical solution, the image acquisition unit 120 may further include the aforementioned locking member. Based on the aforementioned configuration, during the debugging process of the detection device 100, the aforementioned locking member can be set to the aforementioned unlocked state, thereby facilitating the rotation adjustment of the polarizing lens 122. After the detection device 100 is debugged, the aforementioned locking member can be set to the aforementioned locked state to prevent the polarizing lens 122 from rotating, thus ensuring that the angular position of the polarizing lens 122 remains stable, thereby guaranteeing the filtering effect of the polarizing lens 122 on the polarized light reflected from the background texture.

[0097] It is understood that the aforementioned locking member can have various structural forms and rotation restriction methods for the polarizing lens 122. For example, the aforementioned locking member can be a buckle provided on the imaging unit 121, and the polarizing lens 122 can have a slot adapted to the aforementioned buckle. When the aforementioned buckle is engaged with the aforementioned slot, the buckle can restrict the rotational freedom of the polarizing lens 122 on the image acquisition end 1211. Alternatively, the aforementioned locking member can be a sleeve-shaped structure, with a first mating hole and a second mating hole inside the locking member. The shape of the aforementioned first mating hole is adapted to the shape of the imaging unit 121, and the shape of the aforementioned second mating hole is adapted to the shape of the polarizing lens 122. The locking member is detachably connected to the imaging unit 121 and the polarizing lens 122. When the locking member is connected to the imaging unit 121 and the polarizing lens 122, both the imaging unit 121 and the polarizing lens 122 are limited and engaged with the locking member. In practical applications, the structure of the aforementioned locking component and the method of restricting the rotation of the polarizing lens 122 can be selected according to actual needs, and no further restrictions are imposed here.

[0098] In this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0099] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0100] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0101] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A detection device (100), characterized in that, include: The light source unit (110) is used to emit polarized light to the surface (201) of the workpiece (200) to be inspected; The image acquisition unit (120) includes an imaging unit (121) and a polarizing lens (122). The polarizing lens (122) is disposed on the image acquisition end (1211) of the imaging unit (121). The imaging unit (121) is used to acquire detection image information of the surface to be inspected (201) under polarized light illumination through the polarizing lens (122). The polarizing lens (122) is rotatably connected to the image acquisition end (1211) so that the light transmission axis direction of the polarizing lens (122) is adjustable.

2. The detection device (100) according to claim 1, characterized in that, The polarizing ratio of the polarizing lens (122) is greater than or equal to 105:

1.

3. The detection device (100) according to claim 1, characterized in that, The light source unit (110) includes a linearly polarized light source, and the polarizing lens (122) includes a linearly polarizing plate.

4. The detection device (100) according to claim 1, characterized in that, The light source (110) is configured to emit polarized light onto the surface to be inspected (201) along the target incident direction, wherein the angle between the target incident direction and the normal of the surface to be inspected (201) is greater than 0° and less than or equal to 45°.

5. The detection device (100) according to claim 1, characterized in that, The thickness direction of the polarizing lens (122) is parallel to the optical axis of the imaging unit (121), and the rotation axis of the polarizing lens (122) coincides with the optical axis of the imaging unit (121).

6. The detection device (100) according to claim 1, characterized in that, The imaging unit (121) includes: Line scan camera (121a); A line scan lens (121b) is provided at one end of the line scan camera (121a) and at the other end of the image acquisition end (1211).

7. The detection device (100) according to claim 6, characterized in that, Also includes: The transport unit (130) is used to drive the test piece (200) to move along the target moving direction, which intersects with the scanning direction of the line scan camera (121a).

8. The detection device (100) according to claim 7, characterized in that, The target's movement direction is perpendicular to the scanning direction of the line scan camera (121a).

9. The detection device (100) according to claim 7, characterized in that, The conveying unit (130) includes: Multiple conveying rollers (131) are arranged along the target movement direction, and the roller surface of the conveying rollers (131) is used to roll in contact with the side of the workpiece to be inspected (200) away from the surface to be inspected (201).

10. The detection device (100) according to claim 7, characterized in that, Also includes: A first control unit (140) is connected to the line scan camera (121a) and the conveying unit (130) via signals. The first control unit (140) is used to control the operation of the line scan camera (121a) and the conveying unit (130).

Images