CN110658201B - Optical detection mechanism of diaphragm - Google Patents
Optical detection mechanism of diaphragm Download PDFInfo
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- CN110658201B CN110658201B CN201910944381.1A CN201910944381A CN110658201B CN 110658201 B CN110658201 B CN 110658201B CN 201910944381 A CN201910944381 A CN 201910944381A CN 110658201 B CN110658201 B CN 110658201B
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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
- G01N21/8806—Specially adapted optical and illumination features
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Abstract
The invention relates to the technical field of processing and production of lithium batteries, and discloses an optical detection mechanism of a diaphragm, which comprises an image acquisition device and a detection light source, wherein the detection light source is positioned under the diaphragm to be detected and comprises a first light source and a second light source, the first light source and the second light source are configured to be capable of sequentially emitting first light and second light to the diaphragm to be detected, and the first light and the second light irradiate the same position of the diaphragm to be detected; the image acquisition device is configured to acquire appearance images of the diaphragm to be detected when the first light source and the second light source sequentially emit first light and second light to the diaphragm to be detected respectively. By arranging the first light source and the second light source, the image acquisition device is used for acquiring images of the diaphragm under the irradiation of the first light source and acquiring images of the diaphragm under the irradiation of the second light source, two groups of images acquired at the same position are compared, and defects of holes and oil stains are identified according to the difference of the images.
Description
Technical Field
The invention relates to the technical field of processing and production of lithium batteries, in particular to an optical detection mechanism of a diaphragm.
Background
With the development of industries such as mobile phones, tablet computers, electric vehicles and the like, lithium ion batteries are widely applied. The lithium ion battery consists of a positive electrode, a negative electrode, a diaphragm (transparent film) and electrolyte, wherein the positive electrode and the negative electrode are soaked in the electrolyte, and lithium ions move between the positive electrode and the negative electrode by taking the electrolyte as a medium, so that the charging and discharging of the battery are realized. In order to avoid the short circuit of the anode and the cathode through the electrolyte, the anode and the cathode need to be separated by a diaphragm. The diaphragm is a specially formed polymer film, and the film has a microporous structure, so that lithium ions can freely pass through the film, but electrons cannot pass through the film.
The diaphragm is used as the core material of the lithium ion battery, the performance of the diaphragm directly determines the interface structure and the internal resistance of the battery, and the electrical performance of the battery is directly influenced. In the production process of the diaphragm, the diaphragm has defects due to the production environment, the material and equipment of the sputtering target, human factors and the like. Therefore, the diaphragm needs to be tested before it is put into use.
There are currently two major types of inspection for these defects, manual and automated optical inspection. The manual detection mainly depends on the observation of naked eyes, and the mode of the detection completely depends on the naked eyes, which has great errors and misjudgment, can not accurately judge the flaws in time, and wastes time and labor; the automatic optical detection is realized by acquiring an appearance image of the diaphragm in a mode of adding a backlight source through a line scanning camera and analyzing the appearance image by image processing equipment to obtain whether flaws exist or not, and the automatic optical detection is efficient and accurate.
The existing automatic optical detection adopts a single backlight source, and can not detect the defects of holes and oil stains on the diaphragm, because the oil stains and the holes are irradiated by the single backlight source, images displayed under a camera are the same, and the holes and the oil stains can not be distinguished.
In view of the above-mentioned drawbacks, the present designer is actively making research and innovation to create an optical detection mechanism for a diaphragm with a novel structure, so that the optical detection mechanism has more industrial utility value.
Disclosure of Invention
The invention aims to provide an optical detection mechanism of a diaphragm, which can detect defects such as holes, oil stains and the like on the diaphragm.
In order to achieve the purpose, the invention adopts the following technical scheme:
an optical detection mechanism of a diaphragm comprises an image acquisition device and a detection light source, wherein:
the detection light source is positioned under the diaphragm to be detected and comprises a first light source and a second light source, the first light source and the second light source are configured to be capable of sequentially emitting first light and second light to the diaphragm to be detected, and the first light and the second light irradiate the same position of the diaphragm to be detected;
the image acquisition device is configured to acquire appearance images of the diaphragm to be detected when the first light source and the second light source sequentially emit first light and second light to the diaphragm to be detected respectively.
As a preferable mode of the optical detection mechanism of the above-described diaphragm, an angle between the irradiation of the first light and the irradiation of the second light is in a range of 5 ° to 45 °.
As a preferable mode of the optical detection mechanism for a diaphragm described above, the direction of the first light ray is perpendicular to the diaphragm to be detected.
In a preferable embodiment of the optical detection mechanism for a diaphragm, the first light source and the second light source emit light sequentially at a time interval of 20 microseconds to 50 microseconds.
As a preferable mode of the optical detection mechanism for a diaphragm described above, the first light source emits light for a duration of more than 20 microseconds each time.
As a preferable mode of the optical detection mechanism for a diaphragm described above, the image acquisition device is located above the diaphragm to be detected.
As a preferable mode of the optical detection mechanism for a diaphragm described above, the image acquisition device includes two sets of camera mechanisms arranged in a collinear manner, and the line scanning radiation ranges of the two sets of camera mechanisms can intersect.
As a preferable mode of the optical detection mechanism for a diaphragm, a shooting angle of the camera mechanism is adjustable.
In a preferred embodiment of the optical detection mechanism for a diaphragm, an illumination angle of the first light source and/or the second light source is adjustable.
As a preferable mode of the optical detection mechanism for a diaphragm described above, a distance of the detection light source from the diaphragm to be detected is adjustable.
The invention has the beneficial effects that: by arranging the first light source and the second light source, the image acquisition device is used for acquiring images of the diaphragm under the irradiation of the first light source and acquiring images of the diaphragm under the irradiation of the second light source, two groups of images acquired at the same position are compared, and defects of holes and oil stains are identified according to the difference of the images.
Drawings
FIG. 1 is a schematic perspective view of an optical detection mechanism for a diaphragm according to an embodiment of the present invention;
FIG. 2 is an enlarged view at A in FIG. 1;
fig. 3 is a side view of an optical detection mechanism for a diaphragm according to an embodiment of the present invention.
In the figure: 100-support, 200-image acquisition device, 210-camera mechanism, 211-mount, 2111-first support, 2112-second support, 2113-third support, 212-line scan camera, 300-detection light source, 301-support, 302-support, 303-first light source, 304-second light source, 400-diaphragm.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1 to 3, the optical detection mechanism for a diaphragm of the present invention includes a support 100, an image capturing device 200 disposed on the support 100, and a detection light source 300. The support 100 is of a gantry structure and can be used for a membrane 400 to be detected to pass through; the detection light source 300 is positioned right below the diaphragm 400 to be detected and comprises a first light source 303 and a second light source 304, the first light source 303 and the second light source 304 are configured to sequentially emit a first light ray and a second light ray to the diaphragm 400 to be detected, and the first light ray and the second light ray irradiate the same position of the diaphragm 400 to be detected; the image capturing device 200 is located above the diaphragm 400 to be detected, and the image capturing device 200 is configured to capture an appearance image of the diaphragm 400 to be detected when the first light source 303 and the second light source 304 sequentially emit the first light and the second light to the diaphragm 400 to be detected. The detection light source 300 is disposed below the diaphragm 400 to be detected as a backlight source, and transmits the diaphragm 400 to be detected by illumination.
According to the invention, the first light source 303 and the second light source 304 are arranged, the image acquisition device 200 is used for taking images of the diaphragm 400 under the irradiation of the first light source 303 and the diaphragm 400 under the irradiation of the second light source 304, two groups of images taken at the same position are compared, and defects of holes and oil stains are identified according to the difference of the images.
In an embodiment, for the specific relationship between the first light source 303 and the second light source 304, the included angle between the first light emitted from the first light source 303 and the second light emitted from the second light source 304 is 5 ° to 45 °, and the direction of the first light is perpendicular to the membrane 400 to be detected. The included angle of the first light and the second light is in the range of 5 ° to 15 °, which is a preferred embodiment of the present invention, and of course, the included angle between the first light and the second light may also be other angles such as 1 °, 2 °, 3 °, 4 °, 50 °, 55 °, and the like, and can be set according to actual situations.
For the setting of the light emitting time and the light emitting duration of the first light source 303 and the second light source 304, in the present invention, the time interval between the first light source 303 and the second light source 304 sequentially emits light is 20 microseconds to 50 microseconds, and the light emitting duration of the first light source 303 is greater than 20 microseconds each time. The time interval is the interval from when the first light source 303 is turned off to when the second light source 304 is turned on, so as to avoid the second light source 304 from causing illumination interference to the first light source 303. For example, the specific time interval may be 25 microseconds, 30 microseconds, 35 microseconds, 40 microseconds, or 45 microseconds, but the time interval may also be less than 20 microseconds or greater than 50 microseconds, and the actual time interval depends on the hardware conditions of the camera, the diaphragm 400, and the like, but is not limited thereto. In order to ensure that the image capturing device 200 completely captures the image of the diaphragm 400 when the first light irradiates the diaphragm 400, the light emitting duration of the first light source 303 is greater than 20 microseconds each time, specifically, 25 microseconds, 30 microseconds, 35 microseconds, and the like, and of course, the light emitting duration of the first light source 303 may also be less than 20 microseconds each time, and the actual duration is also determined according to hardware conditions of a camera, a diaphragm, and the like, and is not limited thereto. Likewise, the second light source 304 emits light for more than 20 microseconds each time.
As a preferred embodiment of the present invention, the image capturing apparatus 200 in the present invention includes two sets of camera mechanisms 210 arranged collinearly, and the line-scan radiation ranges of the two sets of camera mechanisms 210 can intersect. Set up two sets of camera mechanisms 210, can shoot the diaphragm 400 that awaits measuring that is located the detection position comprehensively, moreover, sweep radiation range alternately through the line that makes two sets of camera mechanisms 210, more can treat the diaphragm 400 that detects comprehensively and shoot, avoid local shooting can not reach, produce and miss examining. The way of crossing the line scan radiation ranges of the two sets of camera mechanisms 210 can be implemented by translating the camera mechanisms 210, i.e., adjusting the distance between the two sets of camera mechanisms 210.
In the present invention, the shooting angle of the camera mechanism 210 can be adjusted. Through adjusting the shooting angle, can adapt to the diaphragm 400 of different width and angle and shoot, be applicable to different production lines, the suitability is higher.
Specifically, the camera mechanism 210 includes a holder 211 and a line-scan camera 212. The fixing frame 211 includes a first support 2111 connected to the bracket 100, a second support 2112 rotatably connected to the first support 211, and a third support 2113 rotatably connected to the second support 2112, and the line scanner 212 is rotatably connected to the third support 2113. The second support 2112 is rotatable about a first axis (X direction in fig. 2) with respect to the first support 2111; the third support 2113 is able to rotate with respect to the second support 2112 about a second axis (Y direction in fig. 2), which is perpendicular to the first axis; the line scan camera 212 is capable of rotating relative to the third support 2113 about a third axis (Z-direction in fig. 2), which is perpendicular to the second axis and the first axis. Thus, the line scan camera 212 can realize rotation in three directions, so that the diaphragm 400 with different widths and angles can be adapted to be photographed, and the applicability is high.
In addition, in order to make the included angle between the first light and the second light adjustable between 5 ° and 45 °, in the present invention, the illumination angle of the first light source 303 and/or the second light source 304 can be adjusted. Through the illumination angle of adjusting detection light source 300, can adapt to the diaphragm 400 of different width and angle and shoot, be applicable to different production lines, the suitability is higher.
For the adjusting structure of the detection light source 300, the two ends of the first light source 303 and the second light source 304 are both connected with the supporting base 301, the supporting base 301 is rotatably connected with the supporting frame 302, and the supporting frame 302 is fixed on the bracket 100. The mounting structure can realize the rotation of the detection light source 300, thereby adjusting the illumination angle of the detection light source 300.
In order to enable the detection light source 300 to illuminate the diaphragm 400 to be detected within a proper range, the support base 301 is provided with an arc-shaped groove for limiting the rotation angle of the support base, and the support frame 302 is provided with a stop column in sliding fit with the arc-shaped groove. The arc-shaped groove is used for limiting the rotation angle of the supporting seat 301, the structure is simple, and the influence on the illumination effect caused by excessive rotation of the detection light source 300 can be avoided.
In addition, in the present invention, the distance of the sensing light source 300 from the diaphragm 400 to be sensed can be adjusted. The distance between the detection light source 300 and the diaphragm 400 to be detected is adjusted so as to adapt to the illumination of different diaphragms 400 to be detected, and the optimal illumination effect is ensured. The supporting seat 301 can move along the vertical strip-shaped groove arranged on the supporting frame 302, and the distance between the detection light source 300 and the diaphragm 400 to be detected can be adjusted.
The detection light source 300 in the invention is an LED linear light source, and the LED linear light source has the advantages of high uniformity and high brightness, so that the image acquired by the line scanning camera 212 is clearer, and the detection effect is further improved.
When the diaphragm 400 is detected by using the optical detection mechanism of the diaphragm, the method comprises the following steps:
s1: provided is an optical detection mechanism for a diaphragm.
S2: the first light source 303 and the second light source 304 are sequentially driven to emit first light and second light to the diaphragm 400 to be detected, respectively, and the first light and the second light irradiate the same position of the diaphragm 400 to be detected.
Specifically, step S2 includes the steps of:
s21: driving the first light source 303 to emit first light to the diaphragm 400 to be detected, wherein the first light is perpendicular to the diaphragm 400 to be detected;
s22: turn off the first light source 303;
s23: driving the second light source 304 to emit second light to the diaphragm 400 to be detected, wherein the included angle between the second light and the first light is 5-45 degrees;
s24: the second light source 304 is turned off.
The time interval between the sequential driving of the first light source 303 and the second light source 304 is 20 microseconds to 50 microseconds, the duration of the first light emitted by the first light source 303 is greater than 20 microseconds, and the duration of the second light emitted by the second light source 304 is greater than 20 microseconds.
S3: the image obtaining device 200 is driven to obtain a first image and a second image of the diaphragm 400 to be detected during the first light irradiation and the second light irradiation, respectively.
Specifically, step S3 includes the steps of:
s31: driving the two sets of camera mechanisms 210 to simultaneously acquire a first image;
s32: the two sets of camera mechanisms 210 are driven to simultaneously acquire a second image.
S4: and judging whether the diaphragm 400 to be detected has defects or not according to the first image and the second image.
Specifically, step S4 includes the steps of:
s41: looping step S2 and step S3N times to obtain a combined image with a line height of 2N;
s42: splitting odd and even rows of the combined image, and respectively obtaining a first whole image with the row height of N of the first image under the irradiation of the first light source 303 and a second whole image with the row height of N of the second image under the irradiation of the second light source 304; wherein N is a positive integer;
s43: and judging whether the diaphragm 400 to be detected has defects according to the first whole graph and/or the second whole graph.
S5: if it is determined in step S4 that the separator 400 to be inspected has a defect, the type of the defect is determined. Namely, whether the defects at the same position in the first whole image and the second whole image have difference or not is compared to judge the type of the defects.
For the driving of the light source and the camera, an encoder can be used for outputting a pulse signal to a counting card, the counting card modulates the pulse signal and outputs a trigger signal to the light source controller, the light source controller simultaneously outputs the trigger signal to the first light source 303, the second light source 304 and the two groups of camera mechanisms 210 through internal frequency division, and the working time and the extension time of the first light source 303 and the second light source 304 are set through a PC.
In summary, the optical detection mechanism of the diaphragm of the present invention not only can detect defects such as holes and oil stains on the diaphragm 400, but also can adjust the scanning angle of the camera and the illumination angle of the backlight source, and is suitable for taking pictures of diaphragms 400 with different widths and angles produced by different production lines, and meanwhile, the detection effect is also improved.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (8)
1. An optical detection mechanism for a diaphragm, comprising a support (100), and an image acquisition device (200) and a detection light source (300) arranged on the support (100), wherein:
the detection light source (300) is positioned right below the diaphragm (400) to be detected and comprises a first light source (303) and a second light source (304), the first light source (303) and the second light source (304) are configured to sequentially emit a first light ray and a second light ray to the diaphragm (400) to be detected, and the first light ray and the second light ray irradiate the same position of the diaphragm (400) to be detected;
the image acquisition device (200) is configured to acquire appearance images of the diaphragm (400) to be detected when the first light source (303) and the second light source (304) sequentially emit first light rays and second light rays to the diaphragm (400) to be detected respectively;
the image acquisition device (200) comprises two groups of camera mechanisms (210) which are arranged in a collinear way, and the line scanning radiation ranges of the two groups of camera mechanisms (210) can be crossed; the shooting angle of the camera mechanism (210) can be adjusted; the camera mechanism (210) comprises a fixed frame (211) and a line scanning camera (212), the fixed frame (211) comprises a first support (2111) connected with the bracket (100), a second support (2112) rotationally connected with the first support (2111) and a third support (2113) rotationally connected with the second support (2112), and the line scanning camera (212) is rotationally connected with the third support (2113); the second seat (2112) is rotatable with respect to the first seat (2111) about a first axis; the third seat (2113) is rotatable with respect to the second seat (2112) about a second axis; the line scan camera (212) is rotatable about a third axis relative to the third mount (2113); the second axis is perpendicular to the first axis, and the third axis is perpendicular to the second axis and the first axis.
2. An optical diaphragm sensor mechanism as claimed in claim 1 wherein the first light beam is directed at an angle in the range of 5 ° to 45 ° to the second light beam.
3. Optical diaphragm detection mechanism according to claim 2, characterized in that the direction of the first light ray is perpendicular to the diaphragm (400) to be detected.
4. The optical detection mechanism of the membrane according to claim 1, characterized in that the first light source (303) and the second light source (304) emit light sequentially for a time interval of 20-50 microseconds.
5. The optical detection mechanism of the membrane according to claim 4, characterized in that said first light source (303) emits light for a duration greater than 20 microseconds each.
6. Optical diaphragm detection mechanism according to claim 1, characterized in that the image acquisition device (200) is located above the diaphragm (400) to be detected.
7. A diaphragm optical detection mechanism according to claim 1, wherein the illumination angle of the first light source (303) and/or the second light source (304) is adjustable.
8. Optical diaphragm detection mechanism according to one of the claims 1 to 7, characterized in that the distance of the detection light source (300) from the diaphragm (400) to be detected is adjustable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910944381.1A CN110658201B (en) | 2019-09-30 | 2019-09-30 | Optical detection mechanism of diaphragm |
| PCT/CN2019/122593 WO2021062938A1 (en) | 2019-09-30 | 2019-12-03 | Optical detection mechanism for diaphragm |
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| CN201910944381.1A CN110658201B (en) | 2019-09-30 | 2019-09-30 | Optical detection mechanism of diaphragm |
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| CN110658201A CN110658201A (en) | 2020-01-07 |
| CN110658201B true CN110658201B (en) | 2021-06-22 |
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| CN111678921B (en) * | 2020-06-19 | 2024-04-16 | 京东方科技集团股份有限公司 | Optical detection device |
| CN112326676A (en) * | 2020-10-26 | 2021-02-05 | 北京半导体专用设备研究所（中国电子科技集团公司第四十五研究所） | Online quality inspection device and adjusting method thereof |
| CN112782182B (en) * | 2020-12-28 | 2024-05-24 | 武汉理工氢电科技有限公司 | Appearance detection method of 7 MEA |
| CN114047204B (en) * | 2021-09-27 | 2023-04-07 | 广州超音速自动化科技股份有限公司 | Lithium battery diaphragm detector |
| CN116147544B (en) * | 2023-04-03 | 2023-09-29 | 广东汇发塑业科技有限公司 | Plastic film surface flatness detection device |
| CN116609336A (en) * | 2023-04-26 | 2023-08-18 | 晶诺微(上海)科技有限公司 | Defect detection apparatus |
| CN116818785B (en) * | 2023-08-30 | 2023-12-01 | 杭州百子尖科技股份有限公司 | Defect detection method, system and medium based on machine vision |
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| DE19840482A1 (en) * | 1998-09-04 | 2000-03-09 | Giesecke & Devrient Gmbh | Method and device for checking securities |
| WO2008100703A1 (en) * | 2007-02-16 | 2008-08-21 | 3M Innovative Properties Company | Method and apparatus for illuminating film for automated inspection |
| HUP0900142A2 (en) * | 2009-03-06 | 2010-10-28 | 3Dhistech Kft | Method and arrangement for dark-field and bright-field digitalization of sample with or without visible dyestuft in transmitted light |
| JP2012107952A (en) * | 2010-11-16 | 2012-06-07 | Toppan Printing Co Ltd | Optical unevenness inspection device |
| WO2012139088A2 (en) * | 2011-04-08 | 2012-10-11 | Accusentry, Inc. | System and method for generating multiple, interlaced images using a single scanning camera with multiple, alternating light sources |
| DE102011113670A1 (en) * | 2011-09-20 | 2013-03-21 | Schott Ag | Lighting device, inspection device and inspection method for the optical inspection of an object |
| CN103884650B (en) * | 2014-03-28 | 2016-08-24 | 北京大恒图像视觉有限公司 | A kind of multiple light courcess linear array imaging system and method |
| CN104634789A (en) * | 2014-04-24 | 2015-05-20 | 东旭集团有限公司 | System and method for performing foreign matter inspection on upper surface of ultrathin glass substrate |
| CN105784723A (en) * | 2014-12-24 | 2016-07-20 | 日东电工株式会社 | Transmission-type defect detection device and transmission-type defect detection method |
| CN106093068A (en) * | 2016-08-10 | 2016-11-09 | 武汉科技大学 | The imaging system of lithium battery pole slice surface defect detection apparatus and using method thereof |
| CN206920358U (en) * | 2017-07-05 | 2018-01-23 | 深圳市振宇达智能机器人科技有限公司 | Stacked film detection machine |
| CN110609040B (en) * | 2019-09-30 | 2022-01-07 | 苏州精濑光电有限公司 | Optical detection method of diaphragm |
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