Device and method for measuring edge grinding width of glass panel

Abstract

The present invention discloses a device and method for measuring the edge-grinding width of a glass panel. A coaxial light source is used to illuminate a glass panel on a conveyor. Because a semi-reflective mirror is located below the conveyor, the coaxial light source can produce a first reflective area on the un-edge-grinded portion of the glass panel, a second reflective area on the edge-grinded portion of the glass panel, and a third reflective area on the semi-reflective mirror. The second reflective area is located between the first and third reflective areas. As can be seen, after capturing the image with a camera, the glass panel surface, the edge-grinding surface, and the background can be clearly distinguished, thereby measuring the edge size and calculating the edge width. In this way, the edge width can be detected using a single light source, reducing detection costs and the difficulty of adjustment during the measurement process, and improving measurement stability.

Description

Technical Field

[0001] The present invention relates to the technical field of glass panel measurement, and in particular to a device and method for measuring the edge grinding width of a glass panel. Background Art

[0002] Machine vision enables microscopic visual inspection, achieving levels of inspection efficiency unattainable by manual inspection. Currently, many products are made of glass, including LCD panels, wafers, and optical products. To enhance product strength and safety, glass edges often require edge grinding. Typically, the edge grinding is controlled to approximately 0.2mm, improving product reliability, control accuracy, strength, and impact resistance. Because glass has the properties of transmissivity, refraction, and reflection, edge inspection often utilizes a combination of front and back lighting, enabling microscopic edge inspection of large products.

[0003] However, because line scan cameras need to be moved for image capture, combined light sources are bulky, heavy, and inflexible. They cannot be installed in space-constrained environments, and control is complex and expensive. Furthermore, the front and back light sources interfere with each other, and the combined light enters the inspection camera, making adjustment procedures complex and difficult to debug. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for measuring the edge grinding width of a glass panel, which can reduce the difficulty of adjustment during the measurement process and improve the stability of the measurement.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A device for measuring the edge grinding width of a glass panel, comprising a conveying device, a linear array camera and a measuring device;

[0007] The measuring device includes a coaxial light source and a half-reflecting mirror;

[0008] The coaxial light source is located above the conveying device, the line array camera is located above the coaxial light source, and the semi-reflective mirror is located below the conveying device.

[0009] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0010] A method for measuring the edge grinding width of a glass panel, applied to the above-mentioned device for measuring the edge grinding width of a glass panel, comprises the following steps:

[0011] irradiating the edge of the glass panel on the conveying device with the coaxial light source to obtain a first reflective region of the unpolished portion of the glass panel, a second reflective region of the polished portion of the glass panel, and a third reflective region of the half-reflective mirror, wherein the second reflective region is located between the first reflective region and the third reflective region;

[0012] The line array camera is used to photograph the edge of the glass panel illuminated by the coaxial light source, and the edging width of the glass panel is calculated based on the second reflection area in the photographed image.

[0013] The beneficial effect of the present invention lies in the following: using a coaxial light source to illuminate a glass panel on a conveyor, and because the semi-reflective mirror is located below the conveyor, the coaxial light source can produce a first reflection area on the unpolished portion of the glass panel, a second reflection area on the polished portion of the glass panel, and a third reflection area on the semi-reflective mirror, with the second reflection area located between the first and third reflection areas. As can be seen, after capturing the image, the camera can clearly distinguish between the glass panel surface, the polished surface, and the background, thereby measuring the polished edge size and calculating the polished edge width. In this way, the polished edge width can be detected using a single light source, reducing detection costs and the difficulty of adjustments during the measurement process, and improving measurement stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of a device for measuring the edge grinding width of a glass panel according to an embodiment of the present invention;

[0015] Figure 2 This is a flow chart of a method for measuring the edge grinding width of a glass panel according to an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of a method for measuring the edge grinding width of a glass panel according to an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the edge grinding width measurement principle according to an embodiment of the present invention;

[0018] Figure 5 This is a picture taken by a line scan camera according to an embodiment of the present invention;

[0019] Figure 6 Schematic diagram of edge chipping and breakage of a glass panel according to an embodiment of the present invention;

[0020] Description of labels:

[0021] 1. Linear array camera; 2. Coaxial light source; 3. Glass panel; 4. Half-mirror. DETAILED DESCRIPTION

[0022] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0023] Please refer to Figure 1 , an embodiment of the present invention provides a device for measuring the edge grinding width of a glass panel, comprising a conveying device, a linear array camera, and a measuring device;

[0024] The measuring device includes a coaxial light source and a half-reflecting mirror;

[0025] The coaxial light source is located above the conveying device, the line array camera is located above the coaxial light source, and the semi-reflective mirror is located below the conveying device.

[0026] As can be seen from the above description, the beneficial effect of the present invention lies in: using a coaxial light source to illuminate the glass panel on the conveyor. Since the semi-reflective mirror is located below the conveyor, the coaxial light source can produce a first reflection area on the unpolished portion of the glass panel, a second reflection area on the polished portion of the glass panel, and a third reflection area on the semi-reflective mirror, with the second reflection area located between the first and third reflection areas. As can be seen, after the camera captures the image, it can clearly distinguish between the glass panel surface, the polished surface, and the background, thereby measuring the polished edge size and calculating the polished edge width. In this way, the polished edge width can be detected using a single light source, reducing detection costs and the difficulty of adjustment during the measurement process, and improving measurement stability.

[0027] Furthermore, the axial direction of the line array camera and the irradiation direction of the coaxial light source are both perpendicular to the conveying device, and the semi-reflective mirror is parallel to the conveying device.

[0028] From the above description, it can be seen that the axial direction of the linear array camera and the irradiation direction of the coaxial light source are both perpendicular to the conveying device, and the half mirror is perpendicular to the axial direction of the linear array camera, which can ensure measurement accuracy.

[0029] Furthermore, the line array camera and the coaxial light source are movably arranged.

[0030] From the above description, it can be seen that the positions of the line array camera and the coaxial light source can be adjusted according to the width of the glass panel. Since measurement can be performed using only one light source, the adjustment process is simple and convenient, which can further improve the adjustment efficiency during the measurement process.

[0031] Please refer to Figure 2 Another embodiment of the present invention provides a method for measuring the edge grinding width of a glass panel, comprising the steps of:

[0032] irradiating the edge of the glass panel on the conveying device with the coaxial light source to obtain a first reflective region of the unpolished portion of the glass panel, a second reflective region of the polished portion of the glass panel, and a third reflective region of the half-reflective mirror, wherein the second reflective region is located between the first reflective region and the third reflective region;

[0033] The line array camera is used to photograph the edge of the glass panel illuminated by the coaxial light source, and the edging width of the glass panel is calculated based on the second reflection area in the photographed image.

[0034] As can be seen from the above description, a coaxial light source is used to illuminate the glass panel on the conveyor. Since the semi-reflective mirror is located below the conveyor, the coaxial light source can produce a first reflection area on the unpolished portion of the glass panel, a second reflection area on the polished portion of the glass panel, and a third reflection area on the semi-reflective mirror, with the second reflection area located between the first and third reflection areas. Therefore, the camera can clearly distinguish between the glass panel surface, the polished surface, and the background after taking the image, thereby measuring the polished edge size and calculating the polished edge width. In this way, the polished edge width can be detected using a single light source, reducing detection costs and the difficulty of adjustment during the measurement process, and improving measurement stability.

[0035] Furthermore, the calculating the glass panel edge grinding width according to the second reflection area in the captured image includes:

[0036] The edge grinding width of the glass panel is calculated according to the width of the second reflection area and the preset edge grinding angle.

[0037] As can be seen from the above description, the edge grinding width of the glass panel is calculated according to the width of the second reflection area in the captured image and the preset edge grinding angle, so that the edge grinding width can be measured quickly.

[0038] Furthermore, the step of calculating the glass panel edge grinding width according to the second reflection area in the captured image includes:

[0039] According to the continuously calculated edge grinding width, it is determined whether the edge grinding of the glass panel is in a defective condition.

[0040] As can be seen from the above description, for the continuously calculated edge grinding width of the glass panel, it is possible to determine whether the glass panel has any defective conditions such as damage, cracking, or edge chipping according to the change in the edge grinding value.

[0041] Furthermore, it also includes:

[0042] According to the width of the glass panel on the conveyor, adjust the positions of the line array camera and the coaxial light source above the edges of both sides of the glass panel.

[0043] From the above description, it can be seen that the positions of the line array camera and the coaxial light source can be adjusted according to the width of the glass panel. Since measurement can be performed using only one light source, the adjustment process is simple and convenient, which can further improve the adjustment efficiency during the measurement process.

[0044] The device and method for measuring the edge grinding width of a glass panel of the present invention are suitable for reducing the difficulty of adjustment during the measurement process and improving the stability of the measurement when measuring the edge grinding width of a glass panel. The following is an explanation of the specific implementation method:

[0045] Example 1

[0046] Please refer to Figure 1 , a device for measuring the edge grinding width of a glass panel, comprising a conveying device, a line array camera 1 and a measuring device;

[0047] The measuring device includes a coaxial light source 2 and a half-reflecting mirror 4;

[0048] The coaxial light source 2 is located above the conveying device, the line array camera 1 is located above the coaxial light source 2, and the semi-reflective mirror 4 is located below the conveying device.

[0049] In some embodiments, the axial direction of the line array camera 1 and the irradiation direction of the coaxial light source 2 are both perpendicular to the conveying device, and the semi-reflective mirror 4 is parallel to the conveying device.

[0050] In some embodiments, the line array camera 1 and the coaxial light source 2 are movably arranged.

[0051] Example 2

[0052] Please refer to Figure 2 A method for measuring the edge grinding width of a glass panel comprises the following steps:

[0053] S1. Install a line array camera 1 and a coaxial light source 2 above the conveying device, and install a half-reflecting mirror 4 below the conveying device.

[0054] The axial direction of the line array camera 1 and the irradiation direction of the coaxial light source 2 are both perpendicular to the conveying device, and the semi-reflective mirror 4 is parallel to the conveying device.

[0055] For details, please refer to Figure 3 , install the line scan camera 1 and the coaxial light source on the glass panel 3, and install the half mirror 4 on the back of the glass panel 3. Adjust the angle of the half mirror 4 so that it is perpendicular to the axial direction of the line scan camera 1 to ensure the accuracy of the measurement.

[0056] The positions of the line array camera 1 and the coaxial light source 2 above the edges of both sides of the glass panel 3 are adjusted according to the width of the glass panel 3 on the conveying device.

[0057] Specifically, this embodiment includes two sets of line array cameras 1 and coaxial light sources 2. The positions of the line array cameras 1 and the coaxial light sources 2 are adjusted according to the width of the glass panel 3 to ensure that the cameras can capture the edge of the glass panel 3 and the semi-reflective mirror 4 at the bottom of the glass panel 3.

[0058] S2. Irradiate the edge of the glass panel 3 on the conveying device with the coaxial light source 2 to obtain a first reflection area of the unpolished portion of the glass panel 3, a second reflection area of the polished portion of the glass panel 3, and a third reflection area of the half-reflecting mirror 4, wherein the second reflection area is located between the first reflection area and the third reflection area.

[0059] Specifically, in this embodiment, the reflectivity of the half-mirror 4 is 20%, which can reflect a portion of the coaxial light from the front, namely the third reflection area, as the background pattern. Because the reflected light and the front light have the same source, the control characteristics remain consistent, making the control simple. The edge grinding position has a larger reflection angle and does not enter the camera, but appears dark, namely the second reflection area. The edge grinding position of the product is directly reflected back to the camera, namely the first reflection area. The reflected light increases the brightness difference of the edge grinding boundary, which can easily determine the actual edge grinding boundary.

[0060] S3. Use the line array camera 1 to photograph the edge of the glass panel 3 illuminated by the coaxial light source 2, and calculate the edge grinding width of the glass panel 3 according to the second reflection area in the photographed image.

[0061] S31 . Calculate the edge grinding width of the glass panel 3 according to the width of the second reflective area and a preset edge grinding angle.

[0062] For details, please refer to Figure 4 and Figure 5 , scan the glass panel 3 to obtain an image, visually separate the second reflection area, and calculate the edge grinding width according to the width of the second reflection area and the preset edge grinding angle.

[0063] S32: judging whether the edge grinding of the glass panel 3 is in a defective condition according to the continuously calculated edge grinding width.

[0064] For details, please refer to Figure 6 According to the continuously calculated edge grinding width, it can be determined whether the edge grinding of the glass panel 3 is chipped or damaged.

[0065] Therefore, this embodiment uses coaxial light to illuminate the edged surface, without reflecting light to the visual camera; coaxial light to illuminate the product, mostly reflecting light; and the semi-reflecting mirror 4 reflects only a portion of the light. Imaging clearly distinguishes the product surface, the edged surface, and the background, allowing for measurement of edge dimensions and calculation of edge width. Furthermore, irregularities in the edged surface can be used to identify defects such as damage, breakage, and chipping. This allows for edge width detection using a single frontal light source, avoiding interference from multiple light sources. Adjustment is simple and convenient, and detection is stable. It can also be used in space-constrained environments, reducing manufacturing costs and improving adjustment efficiency.

[0066] In summary, the present invention provides a device and method for measuring the edge grinding width of a glass panel. The device utilizes a coaxial light source to illuminate the glass panel on a conveying device. Since the semi-reflective mirror is located below the conveying device, the coaxial light source can obtain a first reflection area of the un-edge grinding portion of the glass panel, a second reflection area of the edge grinding portion of the glass panel, and a third reflection area of the semi-reflective mirror when irradiating the glass panel. The second reflection area is located between the first reflection area and the third reflection area. As can be seen, after the camera is photographed, the surface of the glass panel, the edge grinding surface, and the background can be clearly distinguished, so that the edge grinding size can be measured and the edge grinding width can be calculated. The edge grinding width can be detected by a single front light source, avoiding interference from multiple light sources. Adjustment is simple and convenient, detection is stable, and it can also be conveniently used in places with limited space. In this way, the edge grinding width can be detected by a single light source, reducing detection costs and the difficulty of adjustment during the measurement process, and improving measurement stability.

[0067] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for measuring the edge width of a glass panel, applied to a device for measuring the edge width of a glass panel, the device comprising a conveying device, a linear array camera, and a measuring device; the measuring device comprising a coaxial light source and a semi-reflective mirror; the coaxial light source is located above the conveying device, the linear array camera is located above the coaxial light source, and the semi-reflective mirror is located below the conveying device, characterized in that: Including steps: irradiating the edge of the glass panel on the conveying device with the coaxial light source to obtain a first reflective region of the unpolished portion of the glass panel, a second reflective region of the polished portion of the glass panel, and a third reflective region of the half-reflective mirror, wherein the second reflective region is located between the first reflective region and the third reflective region; The line array camera is used to photograph the edge of the glass panel illuminated by the coaxial light source, and the edging width of the glass panel is calculated based on the second reflection area in the photographed image.

2. The method for measuring the edge grinding width of a glass panel according to claim 1, wherein: The axial direction of the linear array camera and the irradiation direction of the coaxial light source are both perpendicular to the conveying device, and the semi-reflective mirror is parallel to the conveying device.

3. The method for measuring the edge grinding width of a glass panel according to claim 1, wherein: The line array camera and the coaxial light source are movably arranged.

4. The method for measuring the edge grinding width of a glass panel according to claim 1, wherein: Calculating the glass panel edge grinding width according to the second reflection area in the captured image includes: The edge grinding width of the glass panel is calculated according to the width of the second reflection area and the preset edge grinding angle.

5. The method for measuring the edge grinding width of a glass panel according to claim 1, wherein: The method further comprises: calculating the glass panel edge grinding width according to the second reflection area in the captured image; According to the continuously calculated edge grinding width, it is determined whether the edge grinding of the glass panel is in a defective condition.

6. The method for measuring the edge grinding width of a glass panel according to claim 1, wherein: Also includes: According to the width of the glass panel on the conveyor, adjust the positions of the line array camera and the coaxial light source above the edges of both sides of the glass panel.

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