CN111337516A - Glass cover plate inspection device - Google Patents
Glass cover plate inspection device Download PDFInfo
- Publication number
- CN111337516A CN111337516A CN201911194346.9A CN201911194346A CN111337516A CN 111337516 A CN111337516 A CN 111337516A CN 201911194346 A CN201911194346 A CN 201911194346A CN 111337516 A CN111337516 A CN 111337516A
- Authority
- CN
- China
- Prior art keywords
- glass cover
- cover plate
- image
- image pickup
- pickup apparatus
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8806—Specially adapted optical and illumination features
Abstract
The invention relates to a glass cover plate inspection device. The first imaging apparatus descends in a stepwise unit from an origin above a glass cover plate as an inspection object and obtains an image of the glass cover plate. The second image pickup apparatus obtains an image of the glass cover while descending in a step unit together with the first image pickup apparatus. The controller detects the top end position of the glass cover plate based on the image information obtained by the second camera device, and detects the defective position of the glass cover plate based on the detected top end position information of the glass cover plate and the image information obtained by the first camera device, thereby determining whether the genuineness defect occurs.
Description
Technical Field
The present invention relates to a technique for inspecting a glass cover used for a smartphone or the like for defects.
Background
The glass cover plate is a product located on the outermost side of a screen of a smart phone or the like in order to protect the screen from impact and scratch. For the smart phone, the glass cover plate is located on the outermost side of the screen of the smart phone to protect the display and the touch panel of the smart phone.
On the other hand, if there is a defect due to a foreign substance on the glass cover, the screen visibility is reduced because the screen view is obstructed due to the defect. When the glass cover plate is composed of multiple layers (multi-layer), the defects are located not only on the surface of the glass cover plate but also inside the glass cover plate.
Since the surface defect of the glass cover plate can be easily repaired by surface processing or the like, it can be classified as a false defect, and since the internal defect of the glass cover plate cannot be repaired, it can be classified as a true defect. Therefore, when the glass cover plate is inspected for defects, it is necessary to check the defective position to determine whether or not a genuine defect has occurred.
Disclosure of Invention
Technical problem
The invention provides a glass cover plate inspection device which can judge whether the genuineness is poor or not when the glass cover plate is inspected badly and can improve the inspection accuracy.
Means for solving the problems
The glass cover inspection apparatus of the present invention for achieving the above-described problems includes a first image pickup device, a second image pickup device, and a controller. The first imaging apparatus descends in a stepwise unit from an origin above a glass cover plate as an inspection object and obtains an image of the glass cover plate. The second image pickup apparatus obtains an image of the glass cover while descending in a step unit together with the first image pickup apparatus. The controller detects the top end position of the glass cover plate based on the image information obtained by the second camera equipment, detects the bad position of the glass cover plate based on the detected top end position information of the glass cover plate and the image information obtained by the first camera equipment, and judges whether the truth is bad.
The controller detects the defective position by multiplying a value obtained by subtracting the image number obtained at the top end position of the glass cover plate from the image number with the highest definition of the defective position of the glass cover plate according to the image mark number obtained by the first imaging device by a step value.
The first image pickup apparatus may include: a first illuminator above the glass cover plate for illuminating the glass cover plate; and a first camera for obtaining an image of the glass cover plate illuminated according to the first illuminator. The second image pickup apparatus may include: the second illuminator is arranged on the side of the glass cover plate and used for illuminating the glass cover plate; and a second camera for obtaining an image of the glass cover plate illuminated according to the second illuminator.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to determine whether a genuine defect or a fake defect occurs when a defect inspection is performed on a glass cover plate, and classify the types of defects, thereby improving the accuracy of the inspection of the glass cover plate.
Drawings
Fig. 1 is a structural view of a glass cover inspection apparatus according to an embodiment of the present invention.
Fig. 2 is a diagram showing a standby state of the first image pickup apparatus and the second image pickup apparatus at the origin positions.
Fig. 3 is a diagram showing a detection state in which the second image pickup apparatus is lowered to detect the tip end position of the glass cover.
Fig. 4 is a diagram showing a detection state in which the first image pickup apparatus is lowered to detect a defective position of the glass cover.
Fig. 5 is a diagram showing images obtained by the first image pickup apparatus at respective positions of fig. 2 to 4.
Fig. 6 is a diagram showing images obtained by the second image pickup apparatus at respective positions of fig. 2 to 4.
Description of reference numerals
10. Glass cover plate 11, defective part
110. First imaging apparatus 111 first illuminator
116. First camera 120, second image pickup apparatus
121. Second illuminator 126, second camera
130. Controller
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings. Here, the same reference numerals are used for the same components, and a repetitive description is omitted, thereby explaining well-known functions and configurations that may make the gist of the present invention unclear. Embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Therefore, the shapes, sizes, and the like of the components in the drawings may be enlarged for more clear description.
Fig. 1 is a structural view of a glass cover inspection apparatus according to an embodiment of the present invention. Fig. 2 is a diagram showing a standby state of the first image pickup apparatus and the second image pickup apparatus at the origin positions. Fig. 3 is a diagram showing a detection state in which the second image pickup apparatus is lowered to detect the tip end position of the glass cover. Fig. 4 is a diagram showing a detection state in which the first image pickup apparatus is lowered to detect a defective position of the glass cover. Fig. 5 is a diagram showing images obtained by the first image pickup apparatus at respective positions of fig. 2 to 4. Fig. 6 is a diagram showing images obtained by the second image pickup apparatus at respective positions of fig. 2 to 4.
Referring to fig. 1 to 6, a glass cover inspection apparatus 100 according to an embodiment of the present invention includes a first image capturing device 110, a second image capturing device 120, and a controller 130.
The first imaging apparatus 110 descends in a step (step) unit from the origin above the glass cover plate 10 as an inspection object and obtains an image of the glass cover plate 10. The first image pickup device 110 may obtain an image that is most perfectly focused on the defective portion 11 of the glass cover plate 10, i.e., an image with the highest resolution, by descending in a stepwise unit from above the defective portion 11 of the glass cover plate 10 as shown in fig. 5, and may provide the image to the controller 130.
The first image pickup apparatus 110 can perform an elevating operation in accordance with the elevating device 102 in a state where the glass cover 10 is positioned while being placed on the horizontal surface of the floor 101. The first imaging apparatus 110 is lowered from the origin in a step unit in accordance with the state where the lifting tool 102 is raised to the origin, and an image of the glass cover 10 can be obtained.
Wherein the step value may be more than a depth of focus (depth of focus) of the first image pickup apparatus 110. The depth of focus is a range in which a substance can move in focus when the position of the substance is changed according to the optical axis of the lens, and is a distance at which a clear image can be captured. Therefore, the first imaging device 110 can obtain an image focused on the defective portion 11 of the glass cover plate 10 at different steps. The bottom dead center of the first image capturing apparatus 110 may be set to obtain an image of the bottom end of the glass cover 10.
The lifting device 102 may be constituted by a linear actuator such as a piezoelectric actuator. The table 101 is horizontally moved by a horizontal moving means (not shown), and the glass cover 10 is thereby horizontally moved. Therefore, the first image pickup apparatus 110 scans while horizontally relatively moving the glass cover 10, whereby a defective portion of the glass cover 10 can be detected in advance. Of course, in a state where the top 101 is positioned, the first image pickup apparatus 110 can also be moved horizontally.
As an example, the first image capturing apparatus 110 may include: a first illuminator 111 that illuminates the glass cover plate 10 from above the glass cover plate 10; and a first camera 116 for obtaining an image of the glass cover plate 10 illuminated by the first illuminator 111.
The first illuminator 111 may include a light source 112, a mirror 113a, and a beam splitter 113 b. The light source 112 may be an led (light emitting diode). The light source 112 may be disposed above the glass cover plate 10 in such a manner as to irradiate light in a vertical direction. The mirror 113a transmits the light emitted from the light source 112 to the beam splitter 113 b. The beam splitter 113b reflects the light, illuminates the glass cover 10 from above, and transmits the light reflected from the glass cover 10 to the first camera 116.
The first image pickup apparatus 110 can transfer light reflected from the glass cover 10 to the first camera 116 via the objective lens 114 and a tube lens (tubelens, 115). The objective lens 114 is formed of a near infrared objective lens, and can compensate for chromatic aberration from a visible light band to a near infrared band. The tube lens 115 may determine a magnification together with the objective lens 114 and compensate for chromatic aberration. For example, tube lens 115 may have a magnification of 0.75, and objective lens 114 may have a magnification of 10. That is, the first imaging apparatus 110 includes a microscope optical system, and can obtain image information of the defective portion 11 of the glass cover plate 10.
The second image pickup apparatus 120 obtains an image of the glass cover 10 while descending in a step unit together with the first image pickup apparatus 110. The second image pickup apparatus 120 descends in a step unit as shown in fig. 6 and can provide the tip position information of the glass cover plate 10 to the controller 130. The second image pickup apparatus 120 is fixed to the elevating support together with the first image pickup apparatus 110, and can be moved up and down in accordance with the elevating device 102.
For example, the second image pickup apparatus 120 may include: a second illuminator 121 for illuminating the glass cover plate 10 from the side of the glass cover plate 10; and a second camera 126 for obtaining an image of the glass cover plate 10 illuminated by the second illuminator 121. The second illuminator 121 can irradiate light at an oblique angle with respect to the upper surface of the glass cover plate 10. The second illuminator 121 includes a laser light source or an LED light source, and irradiates light in the form of a line beam. That is, the second image pickup apparatus 120 includes an optical triangulation optical system, and can obtain tip position information of the glass cover plate 10.
The controller 130 detects the tip position of the glass cover 10 based on the image information obtained from the second imaging device 120, and detects the defective position of the glass cover 10 based on the detected tip position information of the glass cover 10 and the image information obtained from the first imaging device 110, thereby determining whether a genuine defect occurs.
For example, the controller 130 may detect the defective position by multiplying a value obtained by subtracting the image number obtained at the top end position of the glass cover 10 from the image number having the highest resolution for the defective position of the glass cover 10 based on the image mark number obtained by the first imaging device 110 by a step value.
That is, the controller 130 can detect the defective position of the glass cover plate based on the top end position of the glass cover plate 10 according to the following equation 1.
[ mathematical formula 1 ]
Bad position is Nth image number x step value
The nth image number corresponds to the number sequentially numbered from the image obtained from the top end position of the glass cover plate 10 to the image with the highest resolution of the defective portion 11 of the glass cover plate 10.
The controller 130 may determine a position of a starting point at which light reflected from the second illuminator 121 via the glass cover 10 is sensed by the set area of the second camera 126 as a tip end position of the glass cover 10, as shown in (b) of fig. 6, in the process in which the second imaging apparatus 120 descends in a stepwise unit and obtains an image of the glass cover 10. The setting area of the second camera 126 may correspond to the central area of the imaging portion of the second camera 126, but is not limited to the illustrated contents. The controller 130 may store the image number obtained at the top end position of the glass cover 10 according to the first photographing apparatus 110 in the memory.
In the process that the first imaging device 110 descends in a step unit and obtains the image of the glass cover 10, as shown in fig. 5 (c), the controller 130 selects the image with the highest definition of the defective portion 11 of the glass cover 10, and may store the image number thereof in the memory.
Among them, the controller 130 may select an image having the highest resolution at the defective portion 11 of the glass cover 10 by comparing a plurality of images obtained for each step by the first image pickup device 110, using an image-based method (edge-based method) for estimating resolution by spatially measuring the degree of spread of an edge (edge), or a frequency-based method (spread-based method) for estimating resolution by measuring a frequency distribution.
Therefore, the controller 130 may detect the defective position of the glass cover plate 10 according to the above equation 1. If the controller 130 determines that the detected defective position is located between the top end and the bottom end of the glass cover 10, that is, located inside the glass cover 10, it is determined that the authenticity is defective. If the controller 130 determines that the detected defective position is located at the top end or the bottom end of the glass cover 10, that is, on the surface of the glass cover 10, it is determined as a false defect.
The method of inspecting the glass cover plate 10 for defects according to the glass cover plate inspection apparatus 100 described above is explained as follows.
First, the first imaging apparatus 110 scans for the horizontal relative movement of the glass cover 10 at the height of the origin as shown in fig. 2, whereby the defective portion 11 of the glass cover 10 can be detected in advance. At this time, the controller 130 compares an image obtained by scanning according to the first imaging apparatus 110 with a reference image, thereby detecting the defective portion 11 of the glass cover plate 10.
If the defective portion 11 of the glass cover 10 is detected, the first imaging device 110 descends in a stepwise unit from the origin above the defective portion 11 of the glass cover 10 as shown in fig. 3 and obtains an image of the glass cover 10. Meanwhile, the second image pickup apparatus 120 descends in a stepwise unit together with the first image pickup apparatus 110 and obtains an image of the glass cover 10.
In this process, the controller 130 detects the tip end position of the glass cover plate 10 based on the image information obtained from the second imaging device 120. At this time, as shown in fig. 6 (b), the controller 130 may determine a position of a starting point at which light reflected from the second illuminator 121 via the glass cover 10 is sensed by the set area of the second camera 126 as a top end position of the glass cover 10, and may store an image number obtained from the first imaging device 110 at the top end position of the glass cover 10 in the memory.
As shown in fig. 4, the first image pickup device 110 continues to descend in a stepwise unit and obtains an image of the glass cover 10. The first camera device 110 descends to the bottom position of the glass cover plate 10, and an image of the glass cover plate 10 can be obtained. In this process, the controller 130 may select the image with the highest definition of the defective portion 11 of the glass cover plate 10. At this time, as shown in fig. 5 (c), the controller 130 may store the image number with the highest resolution of the defective portion 11 of the glass cover plate 10 in the memory.
Next, the controller 130 may detect the defective position by multiplying a value obtained by subtracting the image number obtained at the top end position of the glass cover plate 10 from the image number with the highest resolution of the defective portion 11 of the glass cover plate 10 by a step value after reading the image number with the highest resolution of the defective portion 11 of the glass cover plate 10 and the image number obtained at the top end position of the glass cover plate 10 from the memory.
Next, if the controller 130 determines that the detected defective position is located between the top end and the bottom end of the glass cover 10, that is, located inside the glass cover 10, it determines that the genuineness is defective. If the controller 130 determines that the detected defective position is located at the top end or the bottom end of the glass cover 10, that is, on the surface of the glass cover 10, it is determined as a false defect.
As described above, when the glass cover inspection apparatus 100 inspects the glass cover 10 for defects, it is determined whether a genuine defect or a fake defect occurs, and the types of defects can be classified, so that the inspection accuracy of the glass cover 10 can be improved.
While the invention has been described with reference to an embodiment shown in the drawings, it is to be understood that the same is by way of illustration and example only and that various modifications and equivalent other embodiments may be devised by those skilled in the art. Accordingly, the true scope of the invention should be defined only by the appended claims.
Claims (3)
1. A glass cover inspection device, comprising:
a first imaging device which descends in a step unit from an origin above a glass cover plate as an inspection object and obtains an image of the glass cover plate;
a second image pickup device which, together with the first image pickup device, acquires an image of the glass cover while descending in a step unit; and
and a controller for detecting the top position of the glass cover plate based on the image information obtained by the second camera equipment, detecting the defective position of the glass cover plate based on the detected top position information of the glass cover plate and the image information obtained by the first camera equipment, and judging whether the genuineness defect occurs.
2. The glass cover inspection apparatus according to claim 1, wherein the controller detects the defective position by multiplying a value obtained by subtracting the image number obtained at the top end position of the glass cover from the image number having the highest resolution of the defective position of the glass cover based on the image mark number obtained by the first imaging device by a step value.
3. The glass cover inspection device of claim 1,
the first image pickup apparatus described above includes:
a first illuminator above the glass cover plate for illuminating the glass cover plate; and
a first camera for obtaining an image of the glass cover plate illuminated by the first illuminator;
the second image pickup apparatus described above includes:
the second illuminator is arranged on the side of the glass cover plate and used for illuminating the glass cover plate; and
and a second camera for obtaining an image of the glass cover plate illuminated by the second illuminator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2018-0164771 | 2018-12-19 | ||
| KR1020180164771A KR102199313B1 (en) | 2018-12-19 | 2018-12-19 | Apparatus for inspecting cover glass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111337516A true CN111337516A (en) | 2020-06-26 |
| CN111337516B CN111337516B (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911194346.9A Active CN111337516B (en) | 2018-12-19 | 2019-11-28 | Glass cover plate inspection device |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR102199313B1 (en) |
| CN (1) | CN111337516B (en) |
| TW (1) | TWI726504B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102350996B1 (en) * | 2021-10-27 | 2022-01-14 | (주)메티스 | Inspection apparatus for particle of glass using optical lens |
| KR102386098B1 (en) * | 2021-10-27 | 2022-04-14 | (주)메티스 | Inspection apparatus of glass transmissivity using optical lens |
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2018
- 2018-12-19 KR KR1020180164771A patent/KR102199313B1/en active IP Right Grant
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2019
- 2019-11-26 TW TW108142947A patent/TWI726504B/en active
- 2019-11-28 CN CN201911194346.9A patent/CN111337516B/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| KR102199313B1 (en) | 2021-01-06 |
| KR20200076078A (en) | 2020-06-29 |
| TWI726504B (en) | 2021-05-01 |
| TW202024567A (en) | 2020-07-01 |
| CN111337516B (en) | 2023-06-23 |
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