CN111398300A - Imaging method for detecting defects of glass cover plate - Google Patents
Imaging method for detecting defects of glass cover plate Download PDFInfo
- Publication number
- CN111398300A CN111398300A CN202010407793.4A CN202010407793A CN111398300A CN 111398300 A CN111398300 A CN 111398300A CN 202010407793 A CN202010407793 A CN 202010407793A CN 111398300 A CN111398300 A CN 111398300A
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- China
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- light source
- laser light
- cover plate
- glass cover
- scanning camera
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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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
-
- 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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
-
- 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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8901—Optical details; Scanning details
- G01N2021/8908—Strip illuminator, e.g. light tube
-
- 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
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/892—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the flaw, defect or object feature examined
- G01N21/896—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod
- G01N2021/8965—Optical defects in or on transparent materials, e.g. distortion, surface flaws in conveyed flat sheet or rod using slant illumination, using internally reflected light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
Abstract
The invention relates to the technical field of optical imaging, in particular to an imaging method for detecting defects of a glass cover plate, which comprises the following steps of S1: setting a line scanning camera; step S2: adjusting the position of the line scanning camera to ensure that the shooting direction of the line scanning camera is arranged opposite to the conveyor belt; step S3: a first laser light source and a second laser light source are respectively arranged in front of and behind the on-line scanning camera along the moving direction of the conveyor belt; step S4: adjusting the first laser light source and the second laser light source to enable the light paths of the first laser light source and the second laser light source to be located right below the line scanning camera; step S5: controlling a line scanning camera to acquire images while controlling the first laser light source to be turned on; step S6: and controlling the scanning camera to acquire images while controlling the second laser light source to be lightened. The imaging method for detecting the defects of the glass cover plate has better brightness, lower manufacturing cost and lower laser power consumption, and is beneficial to saving energy.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of optical imaging, in particular to an imaging method for detecting defects of a glass cover plate.
[ background of the invention ]
In the defect detection of the glass cover plate, the brightness of the light source plays an important role in the performance of the defects in the image, the image shot by the camera is not clear due to the dark light, the analysis accuracy of the image by an analysis instrument is influenced, and the requirement on the brightness of the light source is higher for a production line requiring a high detection speed.
Most of glass cover plate detection equipment in the market can adopt a TDI camera with high sensitivity or a brightening and stroboscopic controller to reduce the influence of the brightness of a light source on the detection quality, but the manufacturing cost of the product is high, so that the problem that the brightness of the light source is insufficient and the cost cannot be increased too much under the condition that the detection speed is required to be high is solved, and the key point to be solved is achieved.
[ summary of the invention ]
In order to overcome the technical problem, the invention provides an imaging method for detecting the defects of a glass cover plate.
The invention provides an imaging method for detecting defects of a glass cover plate, which solves the technical problem and comprises the following steps:
step S1: setting a line scanning camera;
step S2: adjusting the position of the line scanning camera to ensure that the shooting direction of the line scanning camera is arranged opposite to the conveyor belt;
step S3: a first laser light source and a second laser light source are respectively arranged in front of and behind the on-line scanning camera along the moving direction of the conveyor belt;
step S4: adjusting the first laser light source and the second laser light source to enable the light paths of the first laser light source and the second laser light source to be located right below the line scanning camera;
step S5: controlling a line scanning camera to acquire images while controlling the first laser light source to be turned on;
step S6: and controlling the scanning camera to acquire images while controlling the second laser light source to be lightened.
Preferably, the time for each image acquisition by the line scan camera is 40-60 μ sec.
Preferably, the acute angle formed by the light emitting direction of the first laser light source and the surface of the conveyor belt is 30-75 degrees.
Preferably, the acute angle formed by the light emitting direction of the second laser light source and the surface of the conveyor belt is 30-75 degrees.
Preferably, when the first laser light source is controlled to be turned on, the current passing through the first laser light source is 4-6 times of the rated current of the first laser light source.
Preferably, when the second laser light source is controlled to be turned on, the current passing through the second laser light source is 4-6 times of the rated current of the second laser light source.
Preferably, in step S5, the first laser light source is turned on for the same time as the line scan camera captures a complete image of the glass cover plate.
Preferably, in step S6, the second laser light source is turned on for the same time as the line scan camera captures a complete image of the glass cover plate.
Compared with the prior art, the imaging method for detecting the defects of the glass cover plate has the following advantages:
the problem that whether the glass cover plate is defective or not and the type of defects cannot be determined well due to poor image quality acquired because of insufficient illumination brightness in the rapid detection of the glass cover plate is solved by adopting the laser light source instead of a traditional light source, the laser light source has better brightness and better directivity, the manufacturing cost of the laser light source is lower than that of a TDI camera with high sensitivity and a controller for enhancing stroboscopic effect, the control of enterprises on production cost is facilitated, the power consumption of the laser light source is lower, and the energy is saved.
[ description of the drawings ]
FIG. 1 is a schematic view of a detailed flow structure of an imaging method for detecting defects of a glass cover plate according to the present invention.
FIG. 2 is a schematic perspective view of the first laser source, the second laser source, the line scanning camera, a part of the conveyor belt and the glass cover plate in the imaging method for detecting defects of the glass cover plate according to the present invention.
Description of reference numerals:
11. a first laser light source; 12. a second laser light source; 13. a line scanning camera; 20. a glass cover plate; 30. and (4) a conveyor belt.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1-2, the present invention provides an imaging method for detecting defects of a glass cover plate 20, which is used for acquiring an image of the glass cover plate 20 during the process that the manufactured glass cover plate 20 is conveyed by a conveyor 30, so that a subsequent external analysis device can analyze the defects of the glass cover plate 20 through the image, and the method includes the following steps:
step S1: a line scan camera 13 is provided;
step S2: adjusting the position of the line scanning camera 13 to ensure that the shooting direction of the line scanning camera 13 is arranged opposite to the conveyor belt 30;
step S3: a first laser light source 11 and a second laser light source 12 are respectively arranged in front of and behind the line scanning camera 13 along the moving direction of the conveyor belt 30;
step S4: the first laser light source 11 and the second laser light source 12 are adjusted so that the optical paths of the first laser light source 11 and the second laser light source 12 are both located right below the line scanning camera 13.
Step S5: controlling the line scanning camera 13 to collect images while controlling the first laser light source 11 to be turned on;
step S6: the second laser light source 12 is controlled to be turned on, and the line scanning camera 13 is controlled to perform image acquisition.
The quality of the glass cover plate 20, which is an important component of an electronic product such as a mobile phone and a flat panel, also determines the quality of the electronic product, so it is important to detect defects before the glass cover plate is matched with other components, and if the glass cover plate 20 has defects, which are detected after being matched with other components, it takes manpower and material resources to disassemble.
In steps S5 and S6, the first laser light source 11, the second laser light source 12 and the line scanning camera 13 may be controlled by the time-sharing controller, specifically, the time-sharing controller controls the first laser light source 11 to be turned on and controls the line scanning camera 13 to perform image capturing at the same time, it can be understood that the image of the glass cover 20 illuminated by the first laser light source 11 is captured by the line scanning camera 13 at this time; the time-sharing controller controls the second laser light source 12 to be turned on and controls the line scanning camera 13 to perform image acquisition, and it can be understood that the image acquired by the line scanning camera 13 is the image of the glass cover plate 20 under the illumination of the second laser light source 12. In the invention, the time-sharing controller does not simultaneously control the first laser light source 11 and the second laser light source 12 to be simultaneously lightened, so that the phenomenon of light interference can be prevented. The accuracy of the external analysis equipment for analyzing the defects of the glass cover plate 20 is improved by the images acquired by the line scanning camera 13 through the light sources in two directions.
Preferably, an acute angle formed by the light emitting direction of the first laser light source 11 and the surface where the conveyor belt 30 is located is 30-75 °, an acute angle formed by the light emitting direction of the second laser light source 12 and the surface where the conveyor belt 30 is located is 30-75 °, that is, light rays emitted by the first laser light source 11 and the second laser light source 12 do not enter the line scanning camera 13 after being reflected, so that the first laser light source 11 and the second laser light source 12 are dark field illumination for the line scanning camera 13, and an image acquired by the line scanning camera 13 is a dark field image for the first laser light source 11 and the second laser light source 12.
Further, in step S5, the time for the first laser light source 11 to be turned on is the same as the time for the line scanning camera 13 to collect the complete image of the glass cover plate 20 once, that is, when the time-sharing controller turns on the first laser light source 11, the line scanning camera 13 collects the image of the glass cover plate 20, and when the time-sharing controller controls the first laser light source 11 to be turned off, the line scanning camera 13 completes the complete image collection of the glass cover plate 20 under the illumination of the first laser light source 11; similarly, in step S6, the time for the second laser light source 12 to be turned on is the same as the time for the line scanning camera 13 to collect the complete image of the glass cover plate 20 once, that is, when the time-sharing controller turns on the second laser light source 12, the line scanning camera 13 collects the image of the glass cover plate 20, when the time-sharing controller controls the first laser light source 11 to be turned off, the line scanning camera 13 completes the complete image collection of the glass cover plate 20 once under the illumination of the second laser light source 12, and the external analysis device analyzes the complete image of the glass cover plate 20 collected by the line scanning camera 13 twice, which is beneficial to increase the accuracy of the result of analyzing the defect of the glass cover plate 20 and to identify the defective glass cover plate 20 before the glass cover plate 20 is assembled with other accessories.
Preferably, the time for capturing the image by the line scanning camera 13 is 40-60 μ sec each time, i.e. the time for the line scanning camera 13 to complete the image capturing of the glass cover plate 20 for one time is 40-60 μ sec.
The collection of image is accomplished in short time, and the luminance height of light source also plays great influence to image acquisition's quality, and when luminance is not enough, the image definition of gathering is not enough, when being analyzed by external analytical equipment, just difficult analysis goes out the defect and is difficult for determining the kind of defect. In the invention, when the first laser light source 11 and the second laser light source 12 are controlled to be turned on, that is, when the first laser light source 11 and the second laser light source 12 work, the time-sharing controller controls the currents passing through the first laser light source 11 and the second laser light source 12 to be 4-6 times of the rated currents of the first laser light source 11 and the second laser light source 12 respectively, and increases the actual powers of the first laser light source 11 and the second laser light source 12 to increase the actual brightnesses of the first laser light source 11 and the second laser light source 12, so that the line scanning camera 13 can obtain enough brightness when working to enable the acquired image to be suitable for accurate analysis of the defect by external analysis equipment.
Compared with the prior art, the imaging method for detecting the defects of the glass cover plate has the following advantages:
the problem that whether the glass cover plate is defective or not and the type of defects cannot be determined well due to poor image quality acquired because of insufficient illumination brightness in the rapid detection of the glass cover plate is solved by adopting the laser light source instead of a traditional light source, the laser light source has better brightness and better directivity, the manufacturing cost of the laser light source is lower than that of a TDI camera with high sensitivity and a controller for enhancing stroboscopic effect, the control of enterprises on production cost is facilitated, the power consumption of the laser light source is lower, and the energy is saved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. An imaging method for detecting defects of a glass cover plate, which is applied to the manufactured glass cover plate in the process of being conveyed by a conveyor belt, and is characterized in that: the method comprises the following steps:
step S1: setting a line scanning camera;
step S2: adjusting the position of the line scanning camera to ensure that the shooting direction of the line scanning camera is arranged opposite to the conveyor belt;
step S3: a first laser light source and a second laser light source are respectively arranged in front of and behind the on-line scanning camera along the moving direction of the conveyor belt;
step S4: adjusting the first laser light source and the second laser light source to enable the light paths of the first laser light source and the second laser light source to be located right below the line scanning camera;
step S5: controlling a line scanning camera to acquire images while controlling the first laser light source to be turned on;
step S6: and controlling the scanning camera to acquire images while controlling the second laser light source to be lightened.
2. The method of imaging for defect detection of a glass cover plate of claim 1, wherein: the time for acquiring the image by the line scanning camera is 40-60 mu seconds each time.
3. The method of imaging for defect detection of a glass cover plate of claim 1, wherein: an acute angle formed by the light emitting direction of the first laser light source and the surface of the conveyor belt is 30-75 degrees.
4. The method of imaging for defect detection of a glass cover plate of claim 1, wherein: and an acute angle formed by the light emitting direction of the second laser light source and the surface of the conveyor belt is 30-75 degrees.
5. The method of imaging for defect detection of a glass cover plate of claim 1, wherein: when the first laser light source is controlled to be lightened, the current passing through the first laser light source is 4-6 times of the rated current of the first laser light source.
6. The method of imaging for defect detection of a glass cover plate of claim 1, wherein: when the second laser light source is controlled to be lightened, the current passing through the second laser light source is 4-6 times of the rated current of the second laser light source.
7. The method of imaging for defect detection of a glass cover plate of claim 1, wherein: in step S5, the first laser light source is turned on for the same time as the line scan camera captures a complete image of the glass cover plate.
8. The method of imaging for defect detection of a glass cover plate of claim 1, wherein: in step S6, the second laser light source is turned on for the same time as the line scan camera captures a complete image of the glass cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010407793.4A CN111398300A (en) | 2020-05-14 | 2020-05-14 | Imaging method for detecting defects of glass cover plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010407793.4A CN111398300A (en) | 2020-05-14 | 2020-05-14 | Imaging method for detecting defects of glass cover plate |
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| Publication Number | Publication Date |
|---|---|
| CN111398300A true CN111398300A (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010407793.4A Pending CN111398300A (en) | 2020-05-14 | 2020-05-14 | Imaging method for detecting defects of glass cover plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023092970A1 (en) * | 2021-11-24 | 2023-06-01 | 威海华菱光电股份有限公司 | Image scanning system and scanning method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000162146A (en) * | 1998-11-24 | 2000-06-16 | Nippon Electro Sensari Device Kk | Surface inspecting device |
| CN203534979U (en) * | 2013-10-11 | 2014-04-09 | 长春理工大学 | Portable metal surface defect laser scanning detection device |
| CN104897693A (en) * | 2015-06-12 | 2015-09-09 | 武汉中导光电设备有限公司 | Glass surface defect enhancement device and detection method thereof |
| CN105738384A (en) * | 2016-03-11 | 2016-07-06 | 伍祥辰 | Glass surface defect detector |
| CN109987117A (en) * | 2019-04-23 | 2019-07-09 | 上海欣铁机电科技有限公司 | A kind of machine vision line scanning device, system and inspection car |
| CN209764751U (en) * | 2019-04-12 | 2019-12-10 | 北京深度奇点科技有限公司 | Surface defect detection system |
| CN111007075A (en) * | 2020-01-03 | 2020-04-14 | 佛亚智能装备（苏州）有限公司 | Method for shooting surface defects of engine precision part by multi-angle switching light source |
-
2020
- 2020-05-14 CN CN202010407793.4A patent/CN111398300A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000162146A (en) * | 1998-11-24 | 2000-06-16 | Nippon Electro Sensari Device Kk | Surface inspecting device |
| CN203534979U (en) * | 2013-10-11 | 2014-04-09 | 长春理工大学 | Portable metal surface defect laser scanning detection device |
| CN104897693A (en) * | 2015-06-12 | 2015-09-09 | 武汉中导光电设备有限公司 | Glass surface defect enhancement device and detection method thereof |
| CN105738384A (en) * | 2016-03-11 | 2016-07-06 | 伍祥辰 | Glass surface defect detector |
| CN209764751U (en) * | 2019-04-12 | 2019-12-10 | 北京深度奇点科技有限公司 | Surface defect detection system |
| CN109987117A (en) * | 2019-04-23 | 2019-07-09 | 上海欣铁机电科技有限公司 | A kind of machine vision line scanning device, system and inspection car |
| CN111007075A (en) * | 2020-01-03 | 2020-04-14 | 佛亚智能装备（苏州）有限公司 | Method for shooting surface defects of engine precision part by multi-angle switching light source |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023092970A1 (en) * | 2021-11-24 | 2023-06-01 | 威海华菱光电股份有限公司 | Image scanning system and scanning method |
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Application publication date: 20200710 |
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