A product appearance inspection device

Abstract

This utility model relates to the field of testing equipment technology, specifically to a product appearance inspection device. The product appearance inspection device includes: a testing platform, a carrier assembly, a pattern projection assembly, an image acquisition assembly, and an analysis device; wherein, the carrier assembly is used to carry the product to be tested; the pattern projection assembly is used to project a coded pattern onto one side of the product to be tested; the image acquisition assembly is used to acquire the coded pattern obtained after reflection from the product to be tested; the analysis device is signal-connected to the image acquisition assembly, and the analysis device is used to perform phase analysis on the collected reflected coded pattern to determine whether the product to be tested has appearance defects. This application projects a coded pattern onto the product using the pattern projection assembly, acquires the reflected coded pattern using the image acquisition assembly, and performs phase unfolding analysis on the phase in the pattern to reconstruct the 3D surface morphology, achieving more accurate identification of appearance defects.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a product appearance testing device. Background Technology

[0002] With the advent of the "mobile" era, portable and efficient tablet electronic products will become the preferred equipment for business people and the younger generation. From mobile phones, laptops, MP3 players to GPS devices, we can easily put them in our pockets and carry them with us, changing our lifestyles and habits. Lightweight and portable tablet electronic products will be mainstream products in the IT market and dominate the portable digital product market. Touchscreen LCD displays are also widely used in tablet electronic products, playing an important role in both daily life and industrial control.

[0003] In related technologies, product defects refer to areas of damage (such as chipped corners, foreign objects, etc.) on or inside the display screen. These defects can be analyzed by capturing images with a camera and then performing image inspection. However, as products are applied in more and more fields, have more and more functions, and their pixel structure becomes more and more complex, defect detection becomes more difficult. In particular, the presence of circuit areas on the product display screen reduces the detection accuracy of appearance defects (display defects and screen defects). Utility Model Content

[0004] In related technologies, there is a lack of effective detection methods for product appearance defects, resulting in low accuracy of product appearance inspection.

[0005] In a first aspect, embodiments of this application provide a product appearance inspection device, which includes: an inspection platform, a carrier assembly, a pattern projection assembly, an image acquisition assembly, and an analysis device; wherein... Carrier assembly, which is used to carry the product under test; A pattern projection component for projecting a coded pattern onto one side of the product under test; An image acquisition component is used to acquire the coded pattern obtained after reflection from the product under test; An analysis device is connected to the image acquisition component via a signal. The analysis device is used to perform phase analysis on the collected reflected coded pattern to determine whether the product under test has any appearance defects.

[0006] In conjunction with the first aspect, in one embodiment, the image acquisition component includes: A camera bracket is mounted on the detection platform, and the camera bracket is equipped with an adjustment slide rail; A camera device is movably mounted on the adjustment slide rail, and the camera device can move along the adjustment slide rail to adjust the height position of the camera device.

[0007] In conjunction with the first aspect, in one embodiment, the camera device includes: A degree-of-freedom adjustment component, which is mounted on the adjustment slide rail; A camera, which is connected to the aforementioned degree-of-freedom adjustment component.

[0008] In conjunction with the first aspect, in one embodiment, the degree-of-freedom adjustment member has three different degree-of-freedom adjustment directions.

[0009] In conjunction with the first aspect, in one embodiment, the detection platform is provided with an ion rod.

[0010] In conjunction with the first aspect, in one embodiment, the pattern projection component includes: A monitor stand, which is mounted on the testing platform; A display, which is connected to the display stand.

[0011] In conjunction with the first aspect, in one embodiment, the display bracket has a rotating rod connected to the display, and the end of the rotating rod is provided with a rotation angle indicator.

[0012] In conjunction with the first aspect, in one embodiment, the vehicle assembly includes: The vehicle slide rail is mounted on the detection platform; A platform is mounted on the vehicle rail and is movable along the vehicle rail.

[0013] In conjunction with the first aspect, in one embodiment, the platform is provided with a position sensor, which is used to monitor whether the platform has reached the detection position.

[0014] In conjunction with the first aspect, in one embodiment, it further includes: a detection chamber having the detection platform mounted thereon, the detection chamber having an upper cover, the upper cover and the detection chamber forming a cavity for housing the detection platform.

[0015] The beneficial effects of the technical solutions provided in this application include at least the following: This application projects a coded pattern onto a product using a pattern projection component, acquires the reflected coded pattern using an image acquisition component, performs phase unfolding analysis on the phase in the pattern, and reconstructs the 3D surface morphology, thereby achieving more accurate identification of appearance defects. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a partial structural schematic diagram of the product appearance inspection equipment in the embodiments of this application; Figure 2 This is a partial front view of the product appearance inspection equipment in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the image acquisition component in an embodiment of this application; Figure 4 This is a schematic diagram of the camera device in the embodiments of this application; Figure 5 This is a front view of the camera device in an embodiment of this application; Figure 6 This is a front view of the pattern projection component in the embodiments of this application; Figure 7 This is a schematic diagram of the pattern projection component in an embodiment of this application; Figure 8 This is a schematic diagram of the structure of the vehicle component in the embodiments of this application; Figure 9 This is a schematic diagram of the product appearance inspection equipment in the automatic door open state in the embodiments of this application; Figure 10 This is a schematic diagram of the product appearance inspection equipment in the automatic door closed state in the embodiments of this application.

[0018] In the diagram: 1. Detection platform; 11. Ion rod; 2. Carrier assembly; 21. Carrier slide rail; 22. Stage; 3. Pattern projection assembly; 31. Display bracket; 32. Display; 33. Rotating rod; 34. Rotation angle indicator; 4. Image acquisition assembly; 41. Camera bracket; 42. Adjustment slide rail; 43. Degree of freedom adjustment component; 431. Rx adjustment unit; 432. Ry adjustment unit; 433. Rz adjustment unit; 44. Camera; 5. Detection chamber; 51. Upper cover; 6. Display; 7. Power instrument; 8. Gas source; 9. Automatic door. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0020] Regarding related technologies, such as Figure 1 and Figure 2 As shown, there is a lack of effective detection methods for product appearance defects, resulting in low accuracy of product appearance inspection.

[0021] In a first aspect, embodiments of this application provide a product appearance inspection device, which includes: an inspection platform 1, a carrier assembly 2, a pattern projection assembly 3, and an image acquisition assembly 4; wherein... The carrier assembly 2 is used to carry the product under test; the pattern projection assembly 3 is used to project a coded pattern onto one side of the product under test; the image acquisition assembly 4 is used to acquire the coded pattern obtained after reflection from the product under test; and the analysis device is signal-connected to the image acquisition assembly 4. The analysis device is used to perform phase analysis on the collected reflected coded pattern to determine whether the product under test has appearance defects.

[0022] It should be noted that PMD equipment modulates a light source to emit light signals of a specific frequency and analyzes the reflection characteristics of the light signals using Time-of-Flight (ToF) or phase difference measurement. The specific operation steps of a PMD device include: light source modulation, reflection reception, and signal demodulation. Light source modulation involves the device emitting modulated infrared or visible light (typically high-frequency sine or square waves), which illuminates the surface of the product being tested. Reflection reception involves the PMD sensor (integrated camera) receiving the reflected light from the product surface. Since defective areas (such as scratches, dents, and stains) cause changes in the intensity, phase, or time delay of the reflected light, the sensor captures these differences. Signal demodulation involves calculating the optical path change by comparing the phase difference or time difference between the emitted and reflected signals, thereby inferring the surface morphology or defects.

[0023] It is worth noting that the product appearance inspection equipment in this application adopts the working principle of a PMD (Phase Deflection) device. Optionally, the pattern projection component 3 is used to project an coded stripe pattern (such as Gray code or sinusoidal stripes) onto one side of the product under test. These stripes will be distorted due to unevenness or defects on the product surface. The image acquisition component 4 is used to capture the distorted stripe pattern. The analysis device can locate the defect location and type by analyzing the degree of stripe distortion (such as phase shift, breakage, and brightness abnormality).

[0024] In some specific implementation methods, such as Figure 3 As shown, the image acquisition component 4 includes: a camera bracket 41 and a camera device; wherein, A camera bracket 41 is assembled on the detection platform 1, and an adjustment slide rail 42 is provided on the camera bracket 41; a camera device is movably mounted on the adjustment slide rail 42, and the camera device can move along the adjustment slide rail 42 to adjust the height position of the camera device.

[0025] Understandably, the camera device captures the reflective stripes of the product under test, and the algorithm analyzes whether the adhesive coating on the product's light-emitting area is uniform.

[0026] In some preferred embodiments, such as Figure 3 As shown, the camera device includes: a degree-of-freedom adjustment component 43 and a camera 44; wherein, A degree-of-freedom adjustment component 43 is mounted on the adjustment slide rail 42; a camera 44 is connected to the degree-of-freedom adjustment component 43.

[0027] It's important to note that the core of depth measurement in PMD devices is the precise measurement of phase difference, which directly corresponds to depth. The depth calculation for each pixel strictly depends on the geometric relationship between the light signal received by that pixel and its corresponding precise emission point position. Tiny, sub-pixel-level geometric positional deviations between the projected and received patterns are significantly amplified by the direct phase difference-depth conversion relationship and the baseline of the triangulation system, leading to unacceptably large depth errors. This deviation also reduces modulation depth and signal-to-noise ratio, weakening the ability to suppress multipath interference. Therefore, a high-precision pattern is a fundamental prerequisite for accurate device calibration and normal algorithm operation. Thus, to obtain high-precision, high-reliability depth data, PMD devices must ensure extremely high alignment accuracy and stability in the geometric position of the projected pattern at the transmitter and the imaging pattern at the receiver, typically requiring sub-pixel-level control.

[0028] Furthermore, such as Figure 4 and Figure 5As shown, the degree-of-freedom adjustment member 43 has three different degree-of-freedom adjustment directions. Specifically, the degree-of-freedom adjustment member 43 includes: an Rx adjustment section 431, an Ry adjustment section 432, and an Rz adjustment section 433.

[0029] It is worth noting that, through the Rx adjustment unit 431, Ry adjustment unit 432, Rz adjustment unit 433 and adjustment slide rail 42, the detection angle between the camera 44 and the product under test can be adjusted to 23°±10° and the detection distance to 500±75mm.

[0030] In some optional embodiments, the pattern projection assembly 3 includes: a display bracket 31 and a display 32; wherein, A monitor bracket 31 is mounted on the testing platform 1; a monitor 32 is connected to the monitor bracket 31.

[0031] It is worth noting that the display 32 is used to display horizontal and vertical stripe patterns. After the camera captures the reflective stripes of the product under test, the analysis device uses algorithms to analyze whether the adhesive coating on the light-emitting area of ​​the product under test is uniform.

[0032] Preferably, such as Figure 6 and Figure 7 As shown, the monitor bracket 31 has a rotating rod 33, which is connected to the monitor 32. The end of the rotating rod 33 is provided with a rotation angle indicator 34.

[0033] It is understood that the rotating rod 33 allows the display 32 body to be adjusted by an angle of 23°±10°, and the detection distance to be adjusted by 375±75mm. According to the angle indication of the rotation angle indicator 34, the rotating rod 33 can be adjusted to allow the display 32 to be adjusted to a suitable posture position.

[0034] Furthermore, a screw is provided in the middle of the display 32, and a locking nut is provided on the display bracket 31. The locking nut is used to lock into the screw to fix the display 32 in a fixed position.

[0035] In some specific implementation methods, such as Figure 8 As shown, the vehicle assembly 2 includes: a vehicle slide rail 21 and a platform 22; wherein, The vehicle slide rail 21 is assembled on the detection platform 1; the platform 22 is installed on the vehicle slide rail 21 and can move along the vehicle slide rail 21.

[0036] It is worth noting that the stage 22 is equipped with a docking structure, which is used to dock with the product under test to fix the product under test.

[0037] Furthermore, the stage 22 is equipped with a POGO protective cover, and the testing platform 1 is equipped with an optical fiber testing device. The optical fiber testing device is used to detect whether the POGO is open when the product to be tested is fed in. Here, POGO refers to the crimped connection module, which is used to conduct electrical connections between the signal generator and the screen under test.

[0038] Preferably, the platform 22 is equipped with a position sensor, which is used to monitor whether the platform 22 has reached the detection position.

[0039] In some specific embodiments, such as Figure 9 and Figure 10 As shown, the product appearance inspection equipment further includes: an inspection chamber 5, on which the inspection platform 1 is mounted; an upper cover 51 is mounted on the inspection chamber 5, and the upper cover 51 and the inspection chamber 5 together form a cavity for housing the inspection platform 1. The upper cover 51 is equipped with an automatically opening door 9.

[0040] Understandably, the automatic door 9 is open before testing, exposing the testing platform 1. At this time, a robotic arm can transfer the product to be tested onto the carrier 22 to complete the docking. As the robotic arm leaves the automatic door 9, the sensor on the automatic door 9 detects the departure of the robotic arm, and the automatic door 9 closes. The carrier rail 21 moves the product to be tested to the designated position for testing.

[0041] In some alternative implementations, the detection platform 1 is provided with an ion rod 11.

[0042] It is worth noting that the ion bar 11 is used to remove static electricity near the product being tested by the equipment.

[0043] Those skilled in the art should know that the application scenarios of this application include, but are not limited to: display defect detection: such as bright and dark spots, Mura (non-uniformity) of OLED / LCD; optical component inspection: lens scratches, coating defects; industrial surface inspection: flatness or contamination of metals and glass.

[0044] In summary, the product appearance inspection equipment of this application can detect micron-level surface defects with high detection sensitivity through phase measurement. Furthermore, because it uses modulated light signals to filter ambient light noise, it has the ability to resist ambient light interference. At the same time, its non-contact structure avoids damage to products (such as displays and optical components). The product appearance inspection equipment of this application has a faster detection rate and is suitable for large-area inspection. Moreover, the product appearance inspection equipment enhances defect contrast through phase information, making it more sensitive to low-contrast defects. Through the above principles, the PMD equipment achieves efficient and accurate detection of defects on luminescent surfaces.

[0045] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0046] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A product appearance inspection apparatus characterized by comprising: include: Detection platform (1); Carrier assembly (2), which is used to carry the product under test; Pattern projection component (3) is used to project a coded pattern onto one side of the product under test; Image acquisition component (4), which is used to acquire the coded pattern obtained after reflection from the product under test; An analysis device is connected to the image acquisition component (4) via a signal. The analysis device is used to perform phase analysis on the collected reflected coded pattern in order to determine whether the product under test has any appearance defects.

2. The product appearance inspection apparatus according to claim 1, wherein The image acquisition component (4) includes: A camera bracket (41) is mounted on the detection platform (1), and an adjustment slide rail (42) is provided on the camera bracket (41). A camera device is movably mounted on the adjustment slide rail (42), and the camera device can move along the adjustment slide rail (42) to adjust the height position of the camera device.

3. The product appearance inspection apparatus according to claim 2, wherein The camera device includes: The degree-of-freedom adjustment component (43) is mounted on the adjustment slide rail (42); The camera (44) is connected to the degree of freedom adjustment member (43).

4. The product appearance inspection apparatus according to claim 3, characterized by: The degree-of-freedom adjustment component (43) has three different degree-of-freedom adjustment directions.

5. The product appearance inspection equipment as described in claim 1, characterized in that: The detection platform (1) is equipped with an ion rod (11).

6. The product appearance inspection apparatus according to claim 1, wherein The pattern projection component (3) includes: A display stand (31) is mounted on the testing platform (1); The display (32) is connected to the display bracket (31).

7. The product appearance inspection apparatus according to claim 6, characterized by: The monitor bracket (31) has a rotating rod (33) connected to the monitor (32), and the end of the rotating rod (33) is provided with a rotation angle indicator (34).

8. The product appearance inspection apparatus according to claim 1, wherein The vehicle assembly (2) includes: The vehicle slide rail (21) is mounted on the detection platform (1); A platform (22) is mounted on the vehicle rail (21) and the platform (22) is movable along the vehicle rail (21).

9. The product appearance inspection apparatus according to claim 8, characterized by: The platform (22) is equipped with a position sensor, which is used to monitor whether the platform (22) has reached the detection position.

10. The product appearance inspection apparatus according to claim 1, wherein Also includes: The detection box (5) is provided with the detection platform (1) and the detection box (5) is provided with an upper cover (51). The upper cover (51) and the detection box (5) form a cavity that houses the detection platform (1).

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