Sheet panel window detection mechanism and detection method

Abstract

The invention provides a sheet panel window detection mechanism and method. The sheet panel window detection mechanism comprises a light source; the light source is used for irradiating a detected product; the tested product is located between the light source and the camera, and the camera is used for shooting the surface condition of the tested product irradiated by the light source; a shielding assembly is arranged between the light source and the camera, an opening is formed in the shielding assembly, a tested product is located at the position of the opening and corresponds to the plane range where the opening is located, and the shielding assembly is used for shielding light around the tested product. The device effectively prevents the problem that the defect recognition rate is affected by small brightness difference caused by the fact that the light source affects the panel, and greatly improves the detection efficiency and accuracy of the panel defects.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of panel detection equipment, in particular to a thin sheet panel window detection mechanism and a detection method. BACKGROUND

[0002] The glass panel of a mobile phone screen needs to be detected. The detection principle is to irradiate light onto the glass panel, then obtain the panel after being irradiated by light through image acquisition, highlight the defects and gaps on the surface of the screen through high brightness, and then detect the quality of the screen. Most of the above detection processes need to be realized through automatic flow lines, thereby improving work efficiency. The current method is to place the glass panel of the mobile phone on the conveying line and set a light source on the panel. However, the single light source irradiation causes the panel surface defects to be not obvious, and only 70% recognition rate can be achieved in identification. When additional light sources are added, as shown in the figure, the multiple light sources will also irradiate the front part of the panel while irradiating the panel, the light difference is small, and the defect recognition is affected. Figure 6 SUMMARY

[0003] To solve the above technical problems, the present application provides a thin sheet panel window detection mechanism, which comprises

[0004] a light source, which is used for irradiating on the measured product;

[0005] a camera, which is located between the light source and the camera, and is used for shooting the surface condition of the measured product after being irradiated by the light source;

[0006] a shielding assembly is arranged between the light source and the camera, and an opening is arranged on the shielding assembly. The measured product is located at the opening position, and the shielding assembly is used for shielding the light around the measured product.

[0007] Preferably, the shielding assembly comprises a dark shield plate.

[0008] Preferably, the shielding assembly comprises a box body, the light source is located in the box body, and ventilation grooves are arranged around the box body.

[0009] Preferably, the light source comprises a plurality of lamp bodies, and the lamp bodies are respectively located at the bottom, both sides and top of the measured product.

[0010] Preferably, the light source comprises a fixing column, a clamping block is arranged on the fixing column, a connecting plate is connected to the clamping block, and the lamp body is connected to the connecting plate.

[0011] Preferably, the camera is a plane array camera or a line scanning camera.

[0012] ​Preferably, the product positioning device further comprises a clamping assembly, which comprises a support, a motor fixedly connected to the support, at least one fixed plate connected to the output end of the motor, a slot formed in the fixed plate, and at least one clamping cylinder arranged on the both sides of the slot in the length direction.

[0013] A sheet material detection method comprises a detection mechanism, and the detection method comprises the following steps:

[0014] The product to be detected is conveyed between the blocking mechanism and the camera, and the opening position is ensured to be within the plane of the opening.

[0015] A plurality of light sources are arranged around the opening and irradiate the opening position, and the light irradiated through the opening is blocked by the blocking assembly.

[0016] The camera acquires the surface image information of the product to be detected at the position of the other side of the product to be detected.

[0017] The sheet panel window detection mechanism and the detection method have the following beneficial effects: the device effectively prevents the light source from affecting the panel to cause the light brightness difference, thereby affecting the flaw recognition rate, and greatly improves the detection efficiency and accuracy of the panel flaw. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced.

[0019] Figure 1 It is a structural schematic diagram of the present application;

[0020] Figure 2 It is a structural schematic diagram of the present application provided with a baffle;

[0021] Figure 3 It is a structural schematic diagram of the present application provided with a box;

[0022] Figure 4 It is a structural schematic diagram of the clamping assembly of the present application;

[0023] Figure 5 It is an enlarged view of the clamping cylinder of the present application;

[0024] Figure 6 It is a schematic diagram of the light of the prior art with low recognition rate;

[0025] Figure 7 It is a schematic diagram of the light of the present application;

[0026] Among them, 1. Light source; 11. Lamp body; 12. Fixing column; 13. Clamping block; 14. Connecting plate; 2. Camera; 3. Product under test; 41. Opening; 42. Baffle; 43. Box; 44. Ventilation slot; 5. Clamping assembly; 51. Bracket; 52. Motor; 53. Fixing plate; 54. Slot; 55. Clamping cylinder; 56. Locking block; 57. Slider; 58. Connecting shaft; 59. Spring. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] Example 1

[0029] like Figure 1 As shown, the present invention proposes a thin-film panel window detection mechanism, including...

[0030] Light source 1; the light source 1 is used to illuminate the product 3 under test;

[0031] Camera 2, the product under test 3 is located between light source 1 and camera 2. Camera 2 is used to capture the surface condition of product under test 3 after being illuminated by light source 1. In this embodiment, camera 2 can be an area scan camera or a line scan camera, and the type of camera is not limited.

[0032] A shielding component is provided between the light source 1 and the camera 2. The shielding component has an opening 41, and the product under test 3 is located at the opening 41, corresponding to the plane area where the opening 41 is located. The shielding component is used to block the light around the product under test 3, such as... Figure 2 As shown, the shielding component can be a baffle 42, which is vertically positioned between the product and the light source 1. The baffle 42 has an opening 41, the size of which is basically the same as that of the product to be tested, ensuring that the size of the product to be tested is within the range of the opening 41. When the light source 1 shines on the opening 41, the light passing through the opening 41 can effectively illuminate the product to be tested. Sufficient light passes through the product to be tested, that is, the light source 1 is arranged in a ring around the product. The light source 1 includes multiple sets of lamp bodies 11, which are located at the bottom, sides and top of the product to be tested 3, respectively.

[0033] When there are surface defects, they can be clearly identified after being captured by camera 2. In this case, by setting up a blocking component, the illumination area is limited to an opening 41, ensuring that the light captured by camera 2 is light that passes through the product surface and basically no light from the shooting side of the product under test. This makes the dark areas of defects more obvious and greatly improves the detection accuracy. It solves the problem that when multiple light sources 1 illuminate the product under test, the entire shooting surface of the product will have a lot of light, resulting in a small contrast in brightness at the defect location and thus a low recognition accuracy.

[0034] It should be noted that the surface of the board is non-reflective to prevent reflected light from affecting defect detection.

[0035] Of course, the shielding component is not limited to a single baffle 42; it can also be a housing 43, such as... Figure 3 As shown, the light source 1 is located inside the housing 43. The housing 43 has an opening 41, which is the same as the baffle 42 in the embodiment. The principle of the opening 41 will not be repeated here. However, the housing 43 is provided with ventilation slots 44 around its perimeter. This is mainly to reduce the temperature caused by internal light and to facilitate air circulation in the entire cleanroom FFU, ensuring that the cleanroom environment prevents airborne particles from affecting the detection accuracy.

[0036] To better stabilize the light source 1, the light source 1 includes a fixing post 12, a clamping block 13 is provided on the fixing post 12, a connecting plate 14 is connected to the clamping block 13, and the lamp body 11 is connected to the connecting plate 14. The camera 2 is an area scan camera 2 or a line scan camera 2.

[0037] A method for testing sheet materials, comprising a testing mechanism, wherein the testing method includes:

[0038] The product to be tested is conveyed between the blocking mechanism and the camera 2, and corresponding to the position of the opening 41, ensuring that the product to be tested is within the area of ​​the plane where the opening 41 is located; specifically, this is achieved through the clamping assembly 5, such as... Figure 4 , Figure 5 As shown, the clamping assembly 5 includes a bracket 51, which is fixed in front of the shielding assembly. A motor 52 is fixedly connected to the bracket 51, and at least one fixing plate 53 is connected to the output end of the motor 52. In this embodiment, two sets of fixing plates 53 are provided for positioning the product. The fixing plate 53 is provided with a slot 54, which is square and can be used to accommodate the product to be tested. At least one clamping cylinder 55 is provided on each side of the slot 54 along its length. For greater stability, at least one clamping cylinder 55 is provided on each side. The upper and lower sets of clamping cylinders 55 are rodless cylinders, which can be purchased from Wuxi Zhongqi Industrial Automation Technology Co., Ltd. A locking block 56 is connected to the slider 57 of the rodless cylinder via a connecting shaft 58. A spring 59 is fitted onto the connecting shaft 58, located between the locking block 56 and the slider 57. The locking block 56 has a V-shaped opening. The opposing locking blocks 56 extend and retract via the clamping cylinder 55, positioning the product to be tested through the V-shaped opening. The spring 59 provides cushioning for the clamped product, preventing damage to the panel. In use, after the product to be tested is placed in the clamping cylinder 55 position by the preceding gripping device, it is driven by the motor 52 to rotate to the opening 41 position.

[0039] like Figure 7As shown, the plurality of light sources 1 respectively irradiate from the opening 41 around to the opening 41 position, the light rays irradiate to the product through the opening 41, the light rays around the opening 41 are shielded by the shielding assembly, which ensures that the light source 1 irradiates to the product from the opening 41 position, and there is no strong light at the edge position of the product. The camera 2 obtains the image information of the surface of the product to be measured at the position of the other side of the product 3 being irradiated, thereby ensuring that there is no strong light around the product when the camera 2 obtains the product image, which can effectively ensure the flaw acquisition rate of the product surface. The actual verification flaw reading rate is 99%. After a single panel is detected, it is driven to rotate to the other side by the motor 52. At this time, when the panel on the other side is detected, a new panel is continued to be clamped on the empty clamping device.

Claims

1. A sheet panel window detection mechanism, characterized by, The utility model relates to a detection mechanism and detection method thereof, and the detection mechanism comprises the following parts: a light source, which is used for irradiating on a product to be detected; a camera, which is located between the light source and the camera, and is used for shooting the surface condition of the product to be detected after being irradiated by the light source; characterized in that a shielding assembly is arranged between the light source and the camera, and the shielding assembly is provided with an opening, the product to be detected is located at the opening position, and the shielding assembly is used for shielding the light around the product to be detected corresponding to the plane range where the opening is located.

2. The sheet material window detection mechanism of claim 1, wherein, The shielding assembly comprises a dark shielding plate.

3. The sheet material window detection mechanism of claim 1, wherein, The shielding assembly comprises a box body, the light source is located in the box body, and ventilation grooves are arranged around the box body.

4. The sheet material window detection mechanism of claim 1 or 3, wherein, The light source comprises a plurality of lamp bodies, and the lamp bodies are respectively located at the bottom, both sides and top of the product to be detected.

5. The sheet material window detection mechanism of claim 4, wherein, The light source comprises a fixing column, the fixing column is provided with a clamping block, a connecting plate is connected to the clamping block, and the lamp body is connected to the connecting plate.

6. The sheet material window detection mechanism of claim 1, wherein, The camera is a plane array camera or a line scanning camera.

7. The sheet material window detection mechanism of claim 1, wherein, The utility model further comprises a clamping assembly for positioning the product, the clamping assembly comprises a support, a motor is fixedly connected to the support, at least one fixed plate is connected to the output end of the motor, a slot is arranged on the fixed plate, at least one clamping air cylinder is arranged on the both sides of the length direction of the slot, and a clamping block is arranged on the output end of the clamping air cylinder.

8. A method of inspecting a sheet material, characterized by, The utility model relates to a detection mechanism and detection method thereof, and the detection mechanism comprises the following parts: The product to be detected is conveyed to the position between the shielding assembly and the camera and corresponds to the opening position, so that the product to be detected is located in the plane range of the opening; a plurality of light sources respectively irradiate the opening position from around the opening, the light irradiates on the product through the opening, and the light around the opening is shielded by the shielding assembly; the camera obtains the surface image information of the product to be detected at the position of the other side of the product to be detected which is irradiated, and the system judges whether the product has defects according to whether the picture surface obtained has darkness.

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