CN112964639B - LCM detection method and equipment - Google Patents
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Abstract
An LCM detection method, comprising the following steps: using alignment marks at two ends of the LCM product as two identification points; acquiring two images at two identification points, thereby identifying the alignment mark and two gold fingers with the farthest distance in the two images; synthesizing images acquired by the two CCD cameras to obtain a first distance value between the two identification points and a second distance value between the two gold fingers with the farthest distance; judging whether the first distance value and the second distance value are respectively located in corresponding preset ranges; which comprises the following steps: and obtaining a first distance value and a second distance value according to the two images and the distance between the two CCD cameras. The method saves the time for obtaining the image, improves the efficiency of LCM product detection, and can realize the effect of quickly obtaining the first distance value and the second distance value. The situation that the image acquisition precision is influenced due to vibration caused by the motion of the CCD camera or inaccurate focusing of the CCD camera is avoided, and the detection accuracy of the LCM product is improved.
Description
Technical Field
The invention relates to the field of product detection, in particular to an LCM detection method and equipment.
Background
The LCM, i.e., a liquid crystal module, refers to a component in which peripheral circuits such as a liquid crystal display device, a connector, a control and drive device, etc. are assembled with a PCB, a backlight, a structural member, etc. CCDs, collectively known in chinese as charge coupled devices, may be referred to as CCD image sensors. A CCD is a semiconductor device that can convert an optical image into a digital signal. The CCD camera has the characteristics of high sensitivity, small volume, vibration resistance and the like. The LCM product has alignment marks at two ends for positioning during installation and use of the product. The LCM product is provided with a plurality of connecting golden fingers at intervals along the two side directions of the alignment mark connecting line. The conventional LCM detection method only uses one camera, when an LCM product needs to be detected, the camera needs to position one alignment mark and shoot an image, then a lens is moved to the other alignment mark, and the alignment mark is positioned and the image is shot after the lens is zoomed again. The whole process is cumbersome and results in a long test time.
Disclosure of Invention
In order to overcome the defects in the prior art, embodiments of the present invention provide an LCM detection method and device, which are used to solve the problem that the LCM detection process is complicated and results in long detection time.
The embodiment of the application discloses: an LCM detection method, comprising the following steps: using alignment marks at two ends of the LCM product as two identification points; the two CCD cameras respectively acquire two images at two identification points, so that the alignment mark and two gold fingers which are farthest away in the two images are identified; synthesizing two images acquired by the two CCD cameras to obtain a first distance value between the two identification points and a second distance value between the two gold fingers with the farthest distance; judging whether the first distance value and the second distance value are respectively located in corresponding preset ranges; in the step "synthesizing two images acquired by two CCD cameras to obtain a first distance value between two recognition points and a second distance value between two gold fingers farthest away", the method includes: and obtaining a first distance value and a second distance value according to the two images and the distance between the two CCD cameras.
Further, a correcting step is included, wherein the correcting step includes correcting a result of synthesizing the two images by the standard ruler.
The embodiment of the application also discloses: an LCM detection apparatus comprising: a stage for placing LCM products; the two CCD cameras are fixedly arranged above the object stage, can align to the alignment marks at the two ends of the LCM product and acquire an aligned image, and the aligned image comprises the alignment marks and two gold fingers with the farthest distance; the image synthesis device is electrically connected with the two CCD cameras, can synthesize the images intercepted by the two CCD cameras, and analyzes the distance between the two end alignment marks of the LCM product and the distance between the two farthest golden fingers according to the synthesized images; the detection device is electrically connected with the image synthesis device, can receive the distance between the two end alignment marks of the LCM product analyzed by the image synthesis device and the distance between the two farthest golden fingers, and can detect the change of the distance between the alignment marks and the change of the distance between the two farthest golden fingers.
Further, the two CCD cameras are located at the same level.
Further, the LED lamp comprises a lamp strip which is arranged around the two CCD cameras.
Further, the object stage comprises a supporting platform and a glass plate arranged on the supporting platform.
Furthermore, the support platform is provided with a avoiding hole at a corresponding position below the glass plate, and a bottom lamp is arranged below the avoiding hole.
Furthermore, the object stage is connected with a first guide shaft and a second guide shaft which are vertically arranged in the horizontal direction in a sliding mode.
Further, the preset distance between the centers of the two CCD cameras is 60 mm.
Furthermore, the device comprises a display device electrically connected with the detection device, and the display device can display the distance detected by the detection device.
The invention has the following beneficial effects:
1. in the process of identifying and acquiring the images, the two CCD cameras can focus the images and acquire the images without moving, so that the time for acquiring the images is saved, and the detection efficiency of LCM products is improved;
2. the first distance value and the second distance value are obtained by synthesizing the two images and the preset distance, so that the effect of quickly obtaining the first distance value and the second distance value can be realized. The CCD camera does not need to move in the process of acquiring the image, so that the situation that the image acquisition precision is influenced due to vibration caused by the movement of the CCD camera or inaccurate focusing of the CCD camera is avoided, and the detection precision of the LCM product is improved;
3. through two CCD cameras, the two alignment marks are positioned at the same time. Because two CCD cameras are fixedly arranged, the time of the CCD cameras moving between two alignment marks is saved, the whole LCM product detection process is simplified, and the detection time is shortened. In addition, because two CCD cameras are fixedly arranged, the CCD cameras can be prevented from being broken down due to movement, and the use stability of the whole LCM detection device is improved.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an LCM detection device in an embodiment of the present invention.
Fig. 2 is a schematic diagram of a positional relationship between a CCD camera and a light strip in an embodiment of the present invention.
Reference numerals of the above figures: 1. an object stage; 11. a support platform; 12. a base; 2. a CCD camera; 3. an image synthesizing device; 4. a detection device; 5. a first guide shaft; 6. a second guide shaft; 7. a light strip.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
As shown in fig. 1 to 2, the LCM detection method according to the embodiment of the present application includes the following steps:
using alignment marks at two ends of the LCM product as two identification points;
the two CCD cameras 2 respectively acquire two images at two identification points, so that the alignment mark and two golden fingers which are farthest away in the two images are identified;
synthesizing the images acquired by the two CCD cameras 2 to obtain a first distance value between the two identification points and a second distance value between the two gold fingers with the farthest distance, wherein the first distance and the second distance can be obtained according to the two images and the distance between the two CCD cameras 2;
and judging whether the first distance value and the second distance value are respectively located in the corresponding preset ranges.
The first distance value may be obtained by:
identifying alignment marks in the two images, obtaining a first distance and a second distance between the central points of the two CCD cameras 2 and the alignment marks along the connecting line direction of the two CCD cameras 2 through the images, and then performing vector addition on the first distance and the second distance and a preset distance between the two CCD cameras 2 to obtain a distance between the two alignment marks, namely a first distance value.
For example, when the preset distance is 55mm, when the first pitch is measured to be 3mm and the second pitch is measured to be 2mm, the alignment mark in the first pitch is located between the two CCD cameras 2 and the alignment mark in the second pitch is located away from the two CCD cameras 2. The distance between the two synthesized alignment marks is 55mm-3mm +2 mm-54 mm, i.e. the first distance value is 54 mm.
The second distance value may be obtained by:
and obtaining a third distance and a fourth distance from the center points of the two CCD cameras 2 to the two farthest golden fingers which are respectively close through the images, and then adding the third distance and the fourth distance to the preset distance seat vector between the two CCD cameras 2 to obtain the distance between the two farthest golden fingers, namely a second distance value.
For example, when the preset distance is 55mm, when the measured third pitch is 4mm and the fourth pitch is 1mm, and the gold finger in the third pitch is far from the two CCD cameras 2, the gold finger in the fourth pitch is between the two CCD cameras 2. The distance between the two gold fingers after the synthesis is 55mm +4mm-1 mm-58 mm, i.e. the second distance value is then 58 mm.
The above embodiment achieves the following technical effects: in the process of identifying and acquiring images, the two CCD cameras 2 can focus the images and acquire the images without moving, so that the time for acquiring the images is saved, and the efficiency of LCM product detection is improved. In addition, since the first distance value and the second distance value are obtained by synthesizing the two images and the preset distance, the effect of rapidly obtaining the first distance value and the second distance value can be realized. The CCD camera 2 does not need to move in the process of obtaining the image, thereby avoiding the situation that the image obtaining precision is influenced due to vibration caused by the movement of the CCD camera 2 or inaccurate focusing of the CCD camera, and improving the precision of the detection of the LCM product.
Specifically, the method comprises a correction step, wherein the correction step comprises correcting the result synthesized by the image synthesis device 3 through a standard ruler, so that the detection accuracy of the whole LCM detection method can be improved. The standard ruler can be a calibrated precision leveling ruler, a carbon fiber ruler, a line ruler (a geneva ruler) or a vertical ruler with a vernier and the like.
For example, the standard ruler measures the first distance value as 60mm and the second distance value as 65mm, and the first distance value after the synthesis by the image synthesizing apparatus 3 is 58mm and the second distance value as 62 mm. It is explained that the image synthesizing apparatus 3 has an error of 2mm when synthesizing the first distance value and an error of 3mm when synthesizing the second distance value. The synthesized result of the image synthesizing device 3 is corrected so that the first distance value is subtracted by 2mm from the synthesized distance value and the second distance value is subtracted by 3mm from the synthesized distance value, thereby completing the correction effect.
As shown in fig. 1 and fig. 2, the present embodiment further provides an LCM detection apparatus, including:
and the object stage 1 is used for placing LCM detection equipment. The object stage 1 may include a base 12 and a support platform 11 above the base 12, and the base 12 may provide a stable support for the whole LCM detection apparatus. The support platform 11 may be the same size as the upper surface of the base 12 to prevent situations where the support platform 11 is too large and the support is unstable or where the support platform 11 is too small and space is wasted. The support platform 11 is used for placing the LCM product, and the upper surface of the support platform 11 can be horizontally arranged, so that the LCM product can be stably placed. The support platform 11 may be a rectangular parallelepiped, but of course, in other alternative embodiments, the shape of the object stage 1 may be adjusted according to actual needs.
The two CCD cameras 2 may be fixedly disposed above the stage 1. Two CCD cameras 2 can be in the middle of leaving certain distance and set up side by side, be provided with the default distance between two CCD camera 2 camera lens centers. The two CCD cameras 2 can shoot alignment marks at two ends of the LCM circuit board and position shot pictures. The two CCD cameras 2 can locate the alignment marks and the two farthest golden fingers in the picture.
The image synthesizing device 3, the image synthesizing device 3 may be located at an upper portion of the CCD camera 2, thereby saving space. Of course, in other alternative embodiments, the position of the image synthesis apparatus 3 may be adjusted according to actual needs. The image synthesizing device 3 can be electrically connected with the two CCD cameras 2, so as to receive the pictures shot by the CCD cameras 2. The image synthesis device 3 can synthesize the images captured by the two CCD cameras 2, and analyze the distance between the two opposite end position markers of the LCM product and the distance between the two farthest golden fingers according to the synthesized images.
The detection device 4, the detection device 4 can be positioned inside the base 12, thereby keeping the whole LCM detection equipment as a whole. Of course, in other alternative embodiments, the position of the detection device 4 may be adjusted according to actual needs. The detection device 4 is electrically connected to the image synthesis device 3, so that the picture synthesized by the image synthesis device 3 can be received. The detection device 4 can receive the distance between the two end alignment marks of the LCM product and the distance between the two farthest golden fingers analyzed by the image synthesis device 3, and the detection device 4 can detect the change of the distance between the alignment marks and the change of the distance between the two farthest golden fingers.
In this embodiment, the support platform 11 on the objective table 1 is a cuboid, the two CCD cameras 2 are arranged along the direction of the long side of the support platform 11, and the preset distance between the two CCD cameras 2 is 55 mm.
When detecting, the LCM product is conveyed to the supporting platform 11 of the object stage 1, and the alignment marks at the two ends of the LCM product are respectively conveyed to the shooting areas of the two CCD cameras 2. The two CCD cameras 2 are respectively positioned on the alignment marks corresponding to the respective shooting areas, and shoot the positioned images containing the alignment marks. Then the two CCD cameras 2 respectively position the shot pictures and identify the alignment marks and the two farthest golden fingers in the pictures. In this process, the image can be located only without further analysis.
The image combining device 3 obtains two images from the two CCD cameras 2 and combines the two images.
The synthesis is explained below:
the image synthesis device 3 identifies the alignment marks in the two images, obtains a first distance and a second distance between the central points of the two CCD cameras 2 and the alignment marks along the connecting line direction of the two CCD cameras 2 through the images, and then performs vector addition on the first distance and the second distance and a preset distance between the two CCD cameras 2 to obtain a distance between the two alignment marks; and obtaining a third distance and a fourth distance from the center points of the two CCD cameras 2 to the two farthest golden fingers which are respectively close through the images, and then performing vector addition on the third distance and the fourth distance and the preset distance between the two CCD cameras 2 to obtain the distance between the two farthest golden fingers. That is, the image synthesis device 3 only needs to calculate and synthesize the distance between the two farthest golden fingers and the distance between the two alignment marks, and may not completely synthesize a complete image of the whole LCM product.
For example, when the first pitch is measured to be 3mm, the second pitch is measured to be 2mm, and the alignment mark in the first pitch is located between the two CCD cameras 2, the alignment mark in the second pitch is far from the two CCD cameras 2. The distance between the two synthesized alignment marks is 55mm-3mm +2 mm-54 mm. When the measured third distance is 4mm and the fourth distance is 1mm, the golden finger in the third distance is far away from the two CCD cameras 2, and the golden finger in the fourth distance is positioned between the two CCD cameras 2. The distance between the two gold fingers after synthesis is 55mm +4mm-1 mm-58 mm.
The detection device 4 obtains the synthesized image from the image synthesis device 3 and detects the synthesized image.
The procedure of detection is explained below:
the detection device 4 detects changes of two distances, namely the distance between the two farthest golden fingers and the distance between the two alignment marks in the image synthesized by the image synthesis device 3. It is set that the detection device 4 sends out a prompt signal when the change value of the two distances is larger than 30 um.
By means of the structure, the two alignment marks are positioned simultaneously through the two CCD cameras 2. Because two CCD cameras 2 are fixedly arranged, the time of the CCD cameras 2 moving between two alignment marks is saved, so that the whole LCM product detection process is simplified, and the detection time is shortened. In addition, because two CCD cameras 2 are fixed to be set up to can prevent that CCD camera 2 from breaking down because of the motion, promote whole LCM check out test set's stability in use.
Specifically, the two CCD cameras 2 may be located at the same level, so that the vertical distance between the two CCD cameras 2 and the alignment marks at both ends of the LCM product may be maintained to be the same, thereby increasing the photographing accuracy of the two CCD cameras 2. The imaging error caused by the distortion of the CCD camera 2 during imaging is reduced.
Specifically, the device comprises a light belt 7 which is arranged around the two CCD cameras 2 and used for supplementing light sources when the CCD cameras 2 shoot. The lamp area 7 can be fixed connection on the ring of 2 outer fringe of two CCD cameras, and the lamp area 7 can set up in the lower extreme of ring to LCM product on the objective table 1 can directly be shone. The light strip 7 can be kept on the same horizontal plane with the lower surfaces of the two CCD cameras 2, thereby increasing the brightness of the light during shooting. Of course, the specific installation position of the lamp strip 7 can be adjusted according to actual needs.
Specifically, the stage 1 may include a support platform 11 and a glass plate (not shown) disposed on the support platform 11. The support platform 11 is used for supporting the LCM product. The glass sheet may be disposed in a central region of the support platform 11.
In a preferred embodiment, the supporting platform 11 may be provided with an avoiding hole (not shown) at a corresponding position below the glass plate, and a bottom lamp may be disposed below the avoiding hole. The illumination direction of the bottom lamp can vertically face upward, so that a light source is supplemented from the lower part of the glass plate, and the definition of an image shot by the CCD camera 2 is increased.
Specifically, the stage 1 may be slidably coupled to a first guide shaft 5 and a second guide shaft 6 vertically arranged in a horizontal direction. The first guide shaft 5 may be disposed along a first direction, and the second guide shaft 6 may be disposed along a second direction. The first direction may be a width direction of a sheet of the first drawing, and the second direction may be a direction perpendicular to the sheet of the first drawing. Of course, the first direction and the second direction can be adjusted according to actual needs. The object stage 1 can move in the horizontal direction in a manner that the supporting platform 11 is slidably connected with the first guide shaft 5 and the second guide shaft 6, so that when multiple rows and multiple columns of LCM products are put in, the object stage 1 can move in the coverage range of the two CCD cameras 2 in a manner that the supporting platform 11 slides, and thus detection on multiple rows and multiple columns of LCM products can be realized.
Specifically, the preset distance between the centers of the two CCD cameras 2 may be 60 mm. Due to the fact that the size of most of existing LCM products ranges from 50mm to 70mm, when most of LCM products are detected, direct detection can be achieved without adjusting preset distance, and the use efficiency of LCM detection equipment is improved.
Specifically, including the display device that can be connected with detection device 4 electric property, display device can show the distance that detection device 4 detected to presenting detection device 4's result directly perceivedly, being convenient for detect the small change of the distance between two counterpoint signs and the distance between two farthest golden fingers.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An LCM detection method is characterized by comprising the following steps:
using alignment marks at two ends of the LCM product as two identification points;
the two CCD cameras respectively acquire two images at the two identification points, so that the alignment mark and two golden fingers which are farthest away in the two images are identified;
synthesizing the two images acquired by the two CCD cameras to obtain a first distance value between the two identification points and a second distance value between the two gold fingers with the farthest distance;
judging whether the first distance value and the second distance value are respectively located in corresponding preset ranges;
wherein, in the step of "synthesizing two images acquired by two CCD cameras to obtain a first distance value between two identification points and a second distance value between two gold fingers with the farthest distance", the method comprises the following steps: and obtaining the first distance value and the second distance value according to the two images and the distance between the two CCD cameras.
2. The LCM detection method according to claim 1, comprising a correction step, wherein the correction step comprises correcting the result of the synthesis of the two images by a standard ruler.
3. An LCM detection device, comprising:
a stage for placing LCM products;
the two CCD cameras are fixedly arranged above the object stage and can align to the alignment marks at the two ends of the LCM product and acquire an aligned image, and the positioned image comprises the alignment marks and two gold fingers with the farthest distance;
the image synthesis device is electrically connected with the two CCD cameras, can synthesize the images intercepted by the two CCD cameras, and analyzes the distance between the alignment marks at the two ends of the LCM product and the distance between the two farthest golden fingers according to the synthesized images;
the detection device can receive the distance between the two opposite alignment marks of the LCM product and the distance between the two farthest golden fingers analyzed by the image synthesis device, and can detect the change of the distance between the alignment marks and the change of the distance between the two farthest golden fingers.
4. The LCM detection apparatus of claim 3, wherein the two CCD cameras are located at the same level.
5. The LCM detection apparatus of claim 3, comprising a light strip that is enclosed around both of the CCD cameras.
6. The LCM detection apparatus of claim 3, wherein the stage comprises a support platform and a glass plate disposed on the support platform.
7. The LCM detection apparatus of claim 6, wherein the support platform is provided with an avoidance hole at a corresponding position below the glass plate, and a bottom lamp is arranged below the avoidance hole.
8. The LCM detection apparatus of claim 3, wherein the object stage is slidably connected to first and second guide shafts vertically arranged in a horizontal direction.
9. The LCM detection apparatus of claim 3, wherein the preset distance between the centers of the two CCD cameras is 60 mm.
10. The LCM detection apparatus of claim 3, comprising a display device electrically connected to the detection device, wherein the display device is capable of displaying the distance detected by the detection device.
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| CN208224653U (en) * | 2018-04-28 | 2018-12-11 | 深圳市科莱电子股份有限公司 | A kind of LCM module test fixture |
| CN108760235A (en) * | 2018-05-18 | 2018-11-06 | 深圳市永顺创能技术有限公司 | A kind of novel full-automatic alignment device of four cameras |
| CN208818970U (en) * | 2018-06-28 | 2019-05-03 | 江苏锦花电子股份有限公司 | A kind of full-automatic LCM defect intelligent detection equipment |
| CN210835525U (en) * | 2019-12-04 | 2020-06-23 | 深圳市赛德利电子科技有限公司 | Novel double-sided LCM (liquid crystal module) |
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