CN113740340A - Large-size liquid crystal display light guide plate defect detection equipment and detection method - Google Patents
Large-size liquid crystal display light guide plate defect detection equipment and detection method Download PDFInfo
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- CN113740340A CN113740340A CN202110783031.9A CN202110783031A CN113740340A CN 113740340 A CN113740340 A CN 113740340A CN 202110783031 A CN202110783031 A CN 202110783031A CN 113740340 A CN113740340 A CN 113740340A
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- 238000006748 scratching Methods 0.000 claims abstract description 14
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Abstract
The invention discloses a large-size light guide plate defect detection device, which comprises a light guide plate line scratching and black point defect imaging device A and a light guide plate shadow and white point defect imaging device B; the light guide plate line scratching and black point defect imaging device A comprises a conveying device, a limiting device and a detecting device, wherein the limiting device and the detecting device are respectively arranged above the conveying device and are respectively used for limiting and detecting the light guide plates conveyed on the conveying device; the light guide plate shadow and white point defect imaging device B comprises a light guide plate suction device, a light guide plate position adjusting device and an image acquisition device. The invention also discloses a detection method by using the device. The invention can realize the detection of the defects of the light guide plate product such as online scratch, stain, shadow, bright spot and the like, can replace manual work to carry out the production detection operation of the light guide plate product, and can effectively improve the production quality of the light guide plate product.
Description
Technical Field
The invention relates to the technical field of light guide plate defect detection equipment, in particular to online large-size light guide plate defect detection equipment and a detection method based on machine vision.
Background
The light guide plate (light guide plate) is made of optical acrylic/PC plate, and then high-tech material with high reflectivity and no light absorption is used to print light guide points on the bottom surface of the optical acrylic plate by laser engraving, V-shaped cross grid engraving and UV screen printing technology. The optical-grade acrylic sheet is used for absorbing the light emitted from the lamp to stay on the surface of the optical-grade acrylic sheet, when the light irradiates each light guide point, the reflected light can be diffused towards each angle, and then the reflected light is damaged and is emitted from the front surface of the light guide plate. The light guide plate can uniformly emit light through various light guide points with different densities and sizes. The reflecting sheet is used for reflecting the light exposed from the bottom surface back to the light guide plate so as to improve the use efficiency of the light; under the condition of equal area brightness, the luminous efficiency is high and the power consumption is low. The single-sided microstructure array light guide plate is generally manufactured by an extrusion molding process.
Because the light guide plate product detects the degree of difficulty height, all has fairly high requirement to camera, light source and relevant hardware equipment, consequently the enterprise of producing the light guide plate product mostly still needs the defect that the mode of artifical utilization human eye observation detected the light guide plate at present, and this kind of mode has been unable to satisfy the demand of industrial automation rapid production, and it is not high to detect the rate of accuracy moreover, has probably reduced the production quality of light guide plate product.
The defects of the light guide plate mainly comprise scratches, stains, bright spots, black spots and the like. The appearance detection of the traditional light guide plate is mainly carried out by means of manpower, and because the factors of subjective judgment and eye fatigue exist in the manual detection, the detection quality is unstable, partial defects are not easy to identify, the labor is more, the cost is high, the labor intensity is high, and the labor efficiency is low.
Disclosure of Invention
The invention aims to provide a large-size liquid crystal display light guide plate defect detection device and a detection method.
In order to solve the technical problem, the invention provides an online defect detection device for a large-size light guide plate based on machine vision, which comprises the following steps: the device comprises a light guide plate line scratching and black point defect imaging device A and a light guide plate shadow and white point defect imaging device B;
the light guide plate line scratching and black point defect imaging device A comprises a conveying device, a limiting device and a detecting device, wherein the limiting device and the detecting device are respectively arranged above the conveying device and are respectively used for limiting and detecting the light guide plates conveyed on the conveying device;
the light guide plate shadow and white point defect imaging device B comprises a light guide plate suction device, a light guide plate position adjusting device and an image acquisition device.
Description of the drawings: device a may also include a stationary platform and device B may also include a support platform.
As an improvement of the defect detection device of the large-size light guide plate, the defect detection device comprises the following components:
the detection device in the light guide plate line scratch and black spot defect imaging device A comprises an area array camera, an upper light box, a line scanning camera and a lower light box;
the fixed platform support is provided with a first camera support, a first longitudinal screw rod lifting table is arranged at the first camera support, the area array camera is arranged on the first longitudinal screw rod lifting table, the position relation of the area array camera relative to the light guide plate on the transmission belt is adjusted by adjusting the first longitudinal screw rod lifting table, and the area array camera is over against the light guide plate and is used for photographing and detecting black spots and stains of the light guide plate;
the fixed platform support is provided with a second camera support, a second transverse screw rod moving platform is installed on the second camera support and used for adjusting the left-right distance, a second longitudinal screw rod lifting platform is installed on the second transverse screw rod moving platform and used for adjusting the up-down distance, a line scanning camera is installed on the second longitudinal screw rod lifting platform, the line scanning camera is right opposite to the light guide plate, and the line scanning camera is used for detecting line scratches of the light guide plate;
the detection device further comprises a second photoelectric sensor and a first photoelectric sensor.
As a further improvement of the defect detection device of the large-size light guide plate, the defect detection device comprises:
a lower lamp box support is arranged on the fixed platform support, a lower lamp box is arranged on the lower lamp box support, the lower lamp box is positioned below the light guide plate and is opposite to the light guide plate, and the lower lamp box is used for providing a light source below the light guide plate;
the fixed platform support is provided with an upper lamp box support, an upper lamp box is installed on the upper lamp box support and located above the light guide plate, and the upper lamp box is used for providing a light source for the line scanning camera.
Namely, a second photoelectric sensor and a first photoelectric sensor are correspondingly arranged on the lower lamp box and the upper lamp box; the line scanning camera and the area array camera are used for collecting images, and the defects of line scratch, pressure damage, stain, dark spots, bright spots and the like of the light guide plate are detected by utilizing image processing.
As a further improvement of the defect detection device of the large-size light guide plate, the defect detection device comprises:
the limiting device of the light guide plate line scratching and black spot defect imaging device A comprises a guide wheel mounting plate and a guide wheel;
the two sides of the conveying belt of the first belt conveying table are respectively provided with a guide wheel and a guide wheel mounting plate, the guide wheel mounting plate is fixedly connected with the first belt conveying table, the transverse screw rod moving table is connected with the guide wheel mounting plate in a sliding mode, the guide wheel is fixedly connected with the transverse screw rod moving table, and the distance between the guide wheel and the guide wheel mounting plate is adjusted by moving the transverse screw rod moving table.
As a further improvement of the defect detection device of the large-size light guide plate, the defect detection device comprises:
the conveying device in the light guide plate line scratching and black spot defect imaging device A comprises a first belt conveying table, a second belt conveying table and a third belt conveying table which are sequentially arranged on a fixed platform support, wherein the head end, the middle end and the rear end of each conveying belt respectively correspond to the conveying belt of the first belt conveying table, the conveying belt of the second belt conveying table and the conveying belt of the third belt conveying table, and the conveying belts are used for conveying light guide plates.
As a further improvement of the defect detection device of the large-size light guide plate, the defect detection device comprises:
the light guide plate suction device in the light guide plate shadow and white point defect imaging device B comprises a mechanical arm, a sucker is arranged on the mechanical arm, and the mechanical arm is installed on a fixed platform support.
One end of a rotating shaft of the manipulator is connected with the stepping motor and is arranged on the fixed platform, and the other end of the rotating shaft is connected with the positioning device jig.
As a further improvement of the defect detection device of the large-size light guide plate, the defect detection device comprises:
the light guide plate position adjusting device in the light guide plate shadow and white point defect imaging device B comprises a first positioning camera and a second positioning camera, wherein the first coaxial light source provides a light source for the first positioning camera, and the second coaxial light source provides a light source for the second positioning camera;
the first positioning camera and the second positioning camera respectively face the left half plane below the light guide plate and the right half plane below the light guide plate.
As a further improvement of the defect detection device of the large-size light guide plate, the defect detection device comprises:
the image acquisition device of the light guide plate shadow and white point defect imaging device B comprises an upper array camera, an upper array camera bracket, a lower array camera I, a lower array camera II, a lower array camera bracket and an LED lamp strip;
an upper area array camera support is arranged right above the jig, an upper area array camera is arranged on the upper area array camera support, the upper area array camera is right opposite to a light guide plate of the jig, and the upper area array camera is used for detecting shadows and stains of the light guide plate;
a lower array camera support is arranged right below the jig, a first lower array camera and a second lower array camera are respectively arranged on the lower array camera support, and a first lower array camera lifting table and a second lower array camera lifting table which are used for adjusting the shooting distance of the cameras are correspondingly arranged on the first lower array camera and the second lower array camera;
the first lower area array camera is opposite to the left half plane below the light guide plate; the second lower area-array camera is opposite to the right half plane below the light guide plate and is used for detecting shadows and stains below the light guide plate;
the jig is used for placing the light guide plate; the LED lamp area is located one side of tool 45, and the LED lamp area links to each other with the tool is fixed, and the effect in LED lamp area is the light guide plate of lightening.
In the invention, a manipulator is connected with a fixed platform, a first coaxial light source and a second coaxial light source are installed on the fixed platform, and a first positioning camera and a second positioning camera are respectively positioned under the first coaxial light source and the second coaxial light source. And the lower array camera I and the lower array camera II carry out image shooting on the light guide plates, and detect the defects of stains, dark spots and the like of the light guide plates by utilizing image processing. The upper array camera sliding pedestal is arranged on the upper array camera support, the upper array camera support is connected with the upper fixing platform, and the lower array camera support is connected with the lower fixing platform.
The invention also provides a detection method by using the device, which comprises the following steps:
firstly, the light guide plate flows through a light guide plate line scratch and black spot defect imaging device A, and high-quality image acquisition of the light guide plate is completed by a line scan camera, an area array camera and the like;
secondly, the light guide plate continuously flows through the light guide plate shadow and white point defect imaging device B, and the light guide plate shadow and white point image acquisition is finished by the vertical array camera, the LED lamp strip and the like;
thirdly, the information collected by the light guide plate line scratch and black spot defect imaging device A is the line scratch, the crush damage and the black spot defect of the light guide plate; the information collected by the light guide plate shadow and white point defect imaging device B is the shadow and white point defects of the light guide plate;
and determining the defects of the light guide plate according to the data.
In the production and manufacturing process of the light guide plate, various types of online defect detection of light guide plate products needs to be realized, and at present, production enterprises detect the defects of the light guide plate by adopting a mode of manually observing by human eyes, so that the mode has high labor intensity and low efficiency, and eye fatigue can occur in long-time operation, thereby affecting the production quality of the light guide plate products. Therefore, the invention provides the online defect detection equipment for the light guide plate based on machine vision, which can be used for detecting the defects of the light guide plate product such as online scratch, stain, shadow, bright spot and the like, and meanwhile, the production detection operation of the light guide plate product can be replaced by manual operation by adding the defect detection module, so that the production quality of the light guide plate product can be effectively improved.
In the present invention: a, imaging a scratch and black point defect of a light guide plate line, and adjusting the position of a guide wheel on a limiting device in advance according to the actual size of the light guide plate; and the conveyor belt carries the light guide plate product to be conveyed from the front end of the belt conveying table to the rear end of the belt conveying table by controlling the motor. The front end of the multi-angle light source is provided with a photoelectric sensor, and when the photoelectric sensor detects that the light guide plate enters the position below the multi-angle light source, the control system controls the line scanning camera to work so as to acquire a high-quality image of the light guide plate; aiming at the collected high-quality image processing and analysis, the defects of scratch, crush damage, stain, dark spots, bright spots and the like of the light guide plate line can be detected; the light guide plate which finishes high-quality image acquisition is carried by the belt conveying table and is conveyed to the rear end of the belt conveying table. After the detection, the light guide plate is conveyed to the detection device B by the conveyor belt. The light guide plate shadow and white point defect imaging device B absorbs the light guide plate by utilizing a manipulator, and the device can be combined with a control system to adjust the placing angle of the light guide plate to the jig by the manipulator so as to enable the light guide plate shadow and white point defect imaging device B to reach the optimal position state. When the light guide plate is placed at the optimal position above the jig, the LED lamp is lighted, and the area-array cameras and the two corresponding area-array cameras which are positioned right above and below the central position of the light guide plate collect shadow images of the light guide plate.
The invention aims at the problems that manual detection of a large-size light guide plate is inconvenient, the detection quality is unstable, and partial defects are difficult to identify. The line array camera and the area array camera can carry out double detection on point defects and line defects, and false detection and missed detection are avoided to the greatest extent. Be provided with light guide plate stop device before sweeping camera formation of image on line, influence to the testing result when can avoiding the light guide plate skew.
The invention has the following technical advantages: the whole light guide plate conveying device enables the rotating shaft to rotate at a constant speed by controlling the servo motor, and the conveying belt is guaranteed to carry the light guide plate to move forwards at a constant speed. The light guide plate line scratch and black spot defect imaging device A is characterized in that a limiting device and a detection device are reasonably designed on a conveying device, and the design of the limiting device ensures that the light guide plate is not dislocated when the conveying belt conveys the light guide plate; the detection device is provided with a line scanning camera, a multi-angle light source and a photoelectric sensor, when the photoelectric sensor detects that the light guide plate enters the multi-angle light source, the control system controls the line scanning camera to work, high-quality image acquisition is carried out, and defect detection of stains, bright spots, dark spots, line scratches, pressure damages and the like is completed according to analysis of the acquired images. After the detection is finished, the light guide plate is conveyed to a detection device B by a conveyor belt, and the structural design of the device B is compact. The light guide plate shadow and white point defect imaging device B utilizes the manipulator to snatch and fix a position the light guide plate, guarantees light guide plate shadow image acquisition's high efficiency and defect detection's accuracy. The whole light guide plate defect detection equipment can realize the online automatic detection of the light guide plate, and further improves the production efficiency of the light guide plate.
In summary, the present invention is used for detecting the optical performance, the brightness uniformity, and whether the appearance defects such as black dots, white dots, line scratches, pressure scars, white marks, etc. exist in the light guide plate, and then determining whether the detected light guide plate is used. The defect detection equipment for the large-size light guide plate has high detection efficiency and automation degree, is reasonable in structural design and stable in performance, can eliminate the influence on the detection result of the light guide plate caused by dust or slight wrinkles on the light guide plate, is convenient and fast in detection method, can replace manual work to automatically detect the defects of the light guide plate product, and improves the production efficiency of enterprises to a certain extent.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 and 8 are schematic structural views of a light guide plate defect detecting apparatus according to the present invention;
FIGS. 2-7 are schematic views of different angles of the light guide plate line scratching and black spot defect imaging device according to the present invention;
FIGS. 9-11 are schematic views of different angles of the light guide plate shadow and white dot defect imaging device according to the present invention;
in the figure: a-light guide plate line scratch and black point defect imaging device, B-light guide plate shadow and white point defect imaging device.
1. The system comprises a fixed platform support, 2. a motor, 3. an area-array camera, 4. a first longitudinal screw rod lifting table, 5. a first camera support, 6. a second transverse screw rod moving table, 7. a second longitudinal screw rod lifting table, 8. a second camera support, 9. a second transverse screw rod moving table, 10. a transverse screw rod moving table;
11. the device comprises a guide wheel mounting plate, 12 guide wheels, 13 a first belt conveying table, 14 an upper lamp box support, 15 an upper lamp box, 16 a first main power belt wheel of the belt conveying table, 17 a power main shaft, 18 a third belt conveying table, 19 a coupler and 20 a first V-shaped belt;
21. a belt conveying table II main power belt pulley, 22 auxiliary belt pulleys I and I, 23 auxiliary belt pulleys II and 24 belt conveying table III main power duplex belt pulley, 25V-shaped belt II and 26 transverse screw rod moving belt supporting frames, 27 bottom transverse screw rod moving belt supporting frames, 28 linear scanning cameras, 29 lower light boxes, 30 lower light box supporting frames;
31. the device comprises a longitudinal screw rod lifting table, a moving table support frame, a transverse screw rod moving table support frame, an auxiliary belt wheel support frame, a belt conveying table II and a belt conveying table 38, a lower array camera II translation table, a coaxial light source 1 fixing plate and a lower support plate 40;
41. the system comprises a large light barrier, 42 mechanical arms, 43 suckers, 44 LED lamp strips, 45 jigs, 46 translation stages of a lower array camera 1, 47 lower array camera supports, 48 lower array cameras I, 49 lower array cameras II and 50 lower array camera II lifting stages;
51. the method comprises the following steps that firstly, a lower array camera lifting platform 52, a first positioning camera 53, a first positioning camera support 54, a coaxial light source 1 supporting plate 55, a first coaxial light source 56, a second positioning camera 57, a second positioning camera support 58, a coaxial light source 2 fixing plate 59, a coaxial light source 2 supporting plate 60 and a second coaxial light source 54;
61. the device comprises an air cylinder, 62 small light barriers, 63 upper array cameras, 64 upper array camera sliding pedestals and 65 upper array camera supports.
Detailed Description
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto:
embodiment 1, a defect detection apparatus for a large-size light guide plate, as shown in fig. 1, mainly includes a light guide plate line scratching and black point defect imaging device a, a light guide plate shadow and white point defect imaging device B;
the light guide plate line scratching and black spot defect imaging device A comprises a fixed platform support 1, a camera support I5, a camera support II 8, an upper lamp box support 14, a transverse screw rod moving platform support 34, an auxiliary belt wheel support 35 and other components are arranged on the fixed platform support, and the light guide plate line scratching and black spot defect imaging device A plays a role in stably supporting a conveying device, a limiting device, a detection device and the like in a fixed connection mode; and the limiting device and the detection device are respectively arranged above the conveying device and are respectively used for limiting and detecting the light guide plate conveyed on the conveying device.
The conveying device comprises a fixed platform support 1, a motor 2, a power main shaft 17, a first belt conveying table 13, a first belt conveying table main power belt pulley 16, a third belt conveying table 18, a coupling 19, a first V-shaped belt 20, a second belt conveying table main power belt pulley 21, a first auxiliary belt pulley 22, a second auxiliary belt pulley 23, a third belt conveying table main power duplex belt pulley 24, a second V-shaped belt 25 and a second belt conveying table 37.
The first belt conveying table 13, the second belt conveying table 37 and the third belt conveying table 18 are sequentially arranged on the fixed platform support 1 to play a role in supporting and fixing. The conveyor belt of the first belt conveying table 13, the conveyor belt of the second belt conveying table 37 and the conveyor belt of the third belt conveying table 18 correspond to the head end, the middle end and the rear end of the whole conveyor belt and are used for conveying the light guide plate. The first belt conveying platform main power belt wheel 16 drives the conveying belt of the first belt conveying platform 13 to work, the second belt conveying platform main power belt wheel 21 drives the conveying belt of the second belt conveying platform 37 to work, and the third belt conveying platform main power duplex belt wheel 24 drives the conveying belt of the third belt conveying platform 18 to work.
A motor 2 is fixedly arranged on the fixed platform support 1, the motor 2 is used for providing power for the device, and the motor 2 is connected with a belt conveying table three-main-power duplex belt pulley 24 through a power main shaft 17 and a coupling 19 and is used for providing power for the device; the belt conveying table three-main-power double-belt pulley 24 is respectively connected with the belt conveying table one-main-power belt pulley 16 and the belt conveying table two-main-power belt pulley 21 through V-shaped belts, so that the rotating speeds of the belt conveying table three-main-power double-belt pulley 24, the belt conveying table one-main-power belt pulley 16 and the belt conveying table two-main-power belt pulley 21 are the same, namely the running speeds of the conveyor belt of the belt conveying table one 13, the conveyor belt of the belt conveying table two 37 and the conveyor belt of the belt conveying table three 18 are the same.
The V-shaped belt I20 is connected with a main power belt wheel 16 and an auxiliary belt wheel I22 of the belt conveying table I; the belt conveyor table three-main power duplex belt pulley 24 is connected with the V-belt one 20, namely, the belt conveyor table one-main power belt pulley 16 is driven to work by the belt conveyor table three-main power duplex belt pulley 24.
The second main power belt pulley 21 of the belt conveying table, the second auxiliary belt pulley 23 and the second V-shaped belt 25 are sequentially connected, the second main power belt pulley 21 of the belt conveying table is connected with the third main power duplex belt pulley 24 of the belt conveying table, namely, the third main power duplex belt pulley 24 of the belt conveying table drives the second main power belt pulley 21 of the belt conveying table to work, and therefore the transmission belt can transmit the light guide plate for detection.
The limiting device consists of a guide wheel mounting plate 11, a guide wheel 12, a transverse screw rod moving platform 10, a transverse screw rod moving belt supporting frame 26 and a bottom transverse screw rod moving belt supporting frame 27.
The guide wheel 12 and the guide wheel mounting plate 11 form a limiting assembly.
The guide wheel 12 and the guide wheel mounting plate 11 are respectively arranged on two sides of the conveying belt of the belt conveying table I13, the guide wheel mounting plate 11 is fixedly connected with the belt conveying table I13, the transverse lead screw moving table 10 is connected with the guide wheel mounting plate 11 in a sliding mode, and the guide wheel 12 is fixedly connected with the transverse lead screw moving table 10, so that the distance between the guide wheel 12 and the guide wheel mounting plate 11 can be adjusted by moving the transverse lead screw moving table 10; when the light guide plate is conveyed on the conveyor belt of the first belt conveying table 13, the light guide plate can be adjusted to be in a proper position on the conveyor belt and then enter the detection device due to deviation caused by conveying jitter.
The transverse screw rod moving belt supporting frame 26 and the bottom transverse screw rod moving belt supporting frame 27 are arranged on the first belt conveying table 13 and are used for adjusting the distance of the guide wheel mounting plate 11.
The transverse screw rod moving platform 10 is connected with a transverse screw rod moving belt support frame 26 and a bottom transverse screw rod moving belt support frame 27, and plays a role in supporting and fixing.
The limiting device is used for positioning the light guide plate and finishing position deviation correction to ensure that the light guide plate is conveyed on the conveying belt according to the position requirement.
The detection device consists of an area-array camera 3, a camera support I5, a lamp box support 14, an upper lamp box 15, a camera support II 8, a line scanning camera 28, a lower lamp box 29 and a lower lamp box support 30;
the area-array camera 3 and the upper lamp box 15 are respectively connected with the first camera support 5 and the lamp box support 14, and the line scan camera 28 and the lower lamp box 29 are respectively connected with the second camera support 8 and the lower lamp box support 30 to play a role in fixing.
The fixed platform support 1 is provided with a first camera support 5, the first camera support 5 is provided with a first longitudinal screw rod lifting platform 4, and the area array camera 3 is arranged on the first longitudinal screw rod lifting platform 4, so that the position relation of the area array camera 3 relative to the light guide plate on the transmission belt can be adjusted by adjusting the first longitudinal screw rod lifting platform 4, and the area array camera 3 is right opposite to the light guide plate and used for photographing and detecting black spots and stains of the light guide plate.
The fixed platform support 1 is provided with a lower lamp box support 30, a lower lamp box 29 is arranged on the lower lamp box support 30, the lower lamp box 29 is positioned below the light guide plate and is opposite to the light guide plate, and the lower lamp box 29 is used for providing a light source below the light guide plate.
The fixed platform support 1 is provided with an upper lamp box support 14, an upper lamp box 15 is installed on the upper lamp box support 14, the upper lamp box 15 is positioned above the light guide plate, and the upper lamp box 15 is used for providing a light source for the line scanning camera 28.
The fixed platform support 1 is provided with a second camera support 8, a second longitudinal screw rod lifting platform 7 is installed on a second transverse screw rod moving platform 6 and used for adjusting the vertical distance, and the second transverse screw rod moving platform 6 is installed on the second camera support 8 and used for adjusting the horizontal distance. The line scanning camera 28 is installed on the second longitudinal screw lifting platform 7, the line scanning camera 28 faces the light guide plate, and the line scanning camera 28 detects line scratches of the light guide plate.
A second photoelectric sensor is arranged in front of the second camera support 8, and a first photoelectric sensor is arranged in front of the first camera support 5; after receiving the second signal from the second photoelectric sensor, the system lights the upper lamp box 15, and triggers the line scan camera 28 to continuously capture images to obtain images of the light guide plate for subsequent algorithm to detect line defects. The light guide plate which has collected the line defect image is transmitted to the next working link by the rear end transmission device, when the system receives a signal of the photoelectric sensor, the lower lamp box 29 is lightened, and simultaneously the area array camera 3 is triggered to continuously collect images, so that the obtained light guide plate image is used for detecting defects such as scratches, black spots and the like by a subsequent algorithm.
The images acquired by the line scan camera 28 are mainly line defects, and the images acquired by the area-array camera 3 are mainly black dot defects.
The light guide plate shadow and white point defect imaging device B comprises a lower array camera second translation table 38, a lower support plate 40, a manipulator 42, a sucker 43, an LED lamp strip 44, a jig 45, a lower array camera support 47, a lower array camera first 48, a lower array camera second 49, a lower array camera second lifting table 50, a lower array camera first lifting table 51, a positioning camera first 52, a positioning camera first support 53, a coaxial light source first 55, a positioning camera second 56, a positioning camera second support 57, a coaxial light source second 60, an upper array camera 63, an upper array camera support 65 and the like.
A third photoelectric sensor is arranged at the tail end of the conveying belt of the third belt conveying table 18;
the light guide plate suction device comprises a manipulator 42, a sucker 43 is arranged on the manipulator 42, and the manipulator 42 is arranged on the fixed platform support 1;
the lower array camera two translation stage 38 is mounted on the lower support plate 40 for adjusting the distance of the camera relative to the light guide plate.
The coaxial light source I55 provides light for the positioning camera I52, and the positioning camera I52 is arranged on a positioning camera I bracket 53 and is opposite to the left half plane below the light guide plate;
the second coaxial light source 60 provides light for the second positioning camera 56, and the second positioning camera 56 is arranged on the second positioning camera bracket 57 and is opposite to the right half plane below the light guide plate;
the first positioning camera 52 and the second positioning camera 56 are used for photographing and positioning the light guide plate, the first positioning camera 52 is used for acquiring the image of the left half part of the light guide plate, and the second positioning camera 56 is used for acquiring the image of the right half part of the light guide plate; the manipulator 42 carries out position grabbing, the position grabbing refers to positioning and grabbing aiming at the light guide plate on the transmission belt of the belt transmission table, the sucker 43 is responsible for sucking the light guide plate, so the light guide plate sucked by the sucker 43 rotates along with the rotation of the manipulator 42, and the manipulator 42 is adjusted to grab according to the photographing detection of the positioning camera so as to adjust the position for grabbing the light guide plate.
The image acquisition device (detection device) mainly comprises an upper array camera 63, an upper array camera support 65, a lower array camera 48, a lower array camera 49, a lower array camera support 47 and an LED lamp strip 44. An upper area-array camera bracket 65 and a lower area-array camera bracket 47 can be installed on the fixed frame to play a role in stably supporting the detection device.
An upper area-array camera support 65 is arranged right above the jig 45, an upper area-array camera 63 is arranged on the upper area-array camera support 65, the upper area-array camera 63 is opposite to a light guide plate of the jig 45, and the function of the upper area-array camera is to detect shadows and stains of the light guide plate. A lower array camera support 47 is arranged right below the jig 45, a first lower array camera 48 and a second lower array camera 49 are respectively arranged on the lower array camera support 47, and a first lower array camera lifting platform 51 and a second lower array camera lifting platform 50 are arranged on the first lower array camera 48 and the second lower array camera 49 and used for adjusting the shooting distance of the cameras. The lower array camera I48 is opposite to the left half plane below the light guide plate; the lower array camera II 49 is opposite to the right half plane below the light guide plate and is used for detecting shadows and stains below the light guide plate. The jig 45 is fixedly connected with the device frame, and the jig 45 is used for fixedly placing the light guide plate. The LED lamp strip 44 is located on one side of the jig 45, the LED lamp strip 44 is fixedly connected with the jig 45, and the LED lamp strip 44 is used for lighting the light guide plate.
The light guide plate position adjusting device comprises the following parts: the device comprises a manipulator 42, a sucker 43, an LED lamp strip 44, a jig 45, a first positioning camera 52 and a second positioning camera 56. Sucking disc 43 installs on manipulator 42, and LED lamp area 44 is installed on tool 45, snatchs the light guide plate that carries on through sucking disc 43 by manipulator 42, and location camera one 52, location camera two 56 are taken a picture the location after, and the camera is taken a picture according to the location again and is detected snatching of adjustment manipulator 42 to adjust the position of snatching the light guide plate, place on tool 45 after manipulator 42 accurately snatchs the light guide plate.
The light guide plate sucked by the suction device, namely the suction cup 43, is adjusted in position by the light guide plate position adjusting device, the light guide plate is accurately placed on the jig 45, the LED lamp strip 44 is lightened at the moment, and shadow images of the upper surface and the lower surface of the light guide plate are collected by the upper array camera 63, the lower array camera 48 and the lower array camera 49. And detecting defects of the light guide plate, such as shadows, white spots and the like by using image processing.
The line scan camera 28, the area array camera 3, the first photoelectric sensor, the second photoelectric sensor, the third photoelectric sensor, the upper lamp box 15, the lower lamp box 29 and the like can form a signal connection relationship with a control system. According to the working process provided by the invention, technicians in the industry can easily prepare the control system; and therefore will not be described in detail herein.
The working process of the invention is as follows:
firstly, the light guide plate enters the detection equipment and is conveyed to each detection device by a conveyor belt, and firstly flows through a light guide plate line scratch and black point defect imaging device A, and high-quality image acquisition of the light guide plate is finished by light sources of a line scanning camera 28 and an area array camera 3;
the method comprises the following specific steps:
1) the light guide plate is firstly conveyed from the first belt conveying table 13 to the position limiting device of the device, and then enters the second belt conveying table 37 after position adjustment.
2) When the light guide plate is transmitted to the second photoelectric sensor triggered in front of the second camera support 8, the upper light box 15 is lightened, and the control system sends a photographing instruction to the line scanning camera 28 to acquire the line scratch information of the light guide plate. The line scan camera 28 can adjust the position of the light guide plate according to its own needs, thereby obtaining good light guide plate imaging.
3) When the light guide plate is transmitted to the first trigger photoelectric sensor in front of the first camera support 5, the lower lamp box 29 is lightened, and the control system sends a photographing instruction to the area array camera 3 to acquire the black spot information of the light guide plate. The area-array camera 3 may itself need to be position-adjusted with respect to the light guide plate so as to obtain good light guide plate imaging, and then transferred to the third belt conveying table 18.
And II, after the image acquisition in the step I is finished, conveying the light guide plate to a light guide plate shadow and white point defect imaging device B through a conveying belt, finishing grabbing the light guide plate by the mechanical arm 42, positioning the light guide plate through the area array camera and the coaxial light source, placing the light guide plate on a detection device, and finishing the image acquisition of the shadow and the white point of the light guide plate by the upper and lower area array camera and the LED lamp belt.
The method specifically comprises the following steps:
1) the light guide plate is conveyed to the tail end of the conveyor belt to trigger the photoelectric sensor III through the conveyor belt III 18, the control system is triggered, the conveyor belt is paused, and the manipulator 42 grabs the light guide plate and places the light guide plate above the positioning camera. The first positioning camera 52 and the second positioning camera 56 are used for photographing and positioning the light guide plate, the manipulator 42 is used for precisely grabbing, namely, the manipulator 42 is used for adjusting the grabbing position of the light guide plate by adjusting the grabbing position of the manipulator 42 according to photographing and detection of the positioning cameras, and the manipulator 42 is used for grabbing the light guide plate and accurately placing the jig 45.
2) When the light guide plate is placed on the jig 45 to trigger the LED lamp strip 44 to light, the control system sends a photographing instruction to the upper array camera 63 and the lower array camera 48/49 to photograph the upper surface and the lower surface of the light guide plate. The camera needs to adjust the position of the light guide plate, so that good light guide plate imaging is obtained, and defects such as shadows and white spots of the light guide plate are detected by image processing.
Thirdly, the information collected by the light guide plate line scratch and black spot defect imaging device A (device A for short) is the line scratch, crush damage and black spot defect of the light guide plate;
the light guide plate shadow and white point defect imaging device B (device B for short) acquires information, specifically shadow and white point defects of the light guide plate;
the device A and the device B respectively transmit the acquired data to the background processor, and the background processor analyzes and judges the defects of the light guide plate through operation. The above data analysis is a conventional technique, and for example, the data analysis can be performed by referring to a method of "research on defect detection method of light guide plate based on machine vision" disclosed in "photoelectron laser" and a method of visual detection of quality of light guide plate with one side entering light "disclosed in" computer system application ", and thus, the present invention will not be described in detail.
Finally, it is also noted that the above-mentioned lists merely illustrate a few specific embodiments of the invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (9)
1. Jumbo size light guide plate defect detecting equipment, its characterized in that: the device comprises a light guide plate line scratching and black point defect imaging device A and a light guide plate shadow and white point defect imaging device B;
the light guide plate line scratching and black point defect imaging device A comprises a conveying device, a limiting device and a detecting device, wherein the limiting device and the detecting device are respectively arranged above the conveying device and are respectively used for limiting and detecting the light guide plates conveyed on the conveying device;
the light guide plate shadow and white point defect imaging device B comprises a light guide plate suction device, a light guide plate position adjusting device and an image acquisition device.
2. The apparatus of claim 1, wherein:
the detection device in the light guide plate line scratch and black spot defect imaging device A comprises an area-array camera (3), an upper light box (15), a line scanning camera (28) and a lower light box (29);
the fixed platform support (1) is provided with a first camera support (5), a first longitudinal screw rod lifting table (4) is arranged at the first camera support (5), the area-array camera (3) is arranged on the first longitudinal screw rod lifting table (4), the position relation of the area-array camera (3) relative to a light guide plate on a transmission belt is adjusted by adjusting the first longitudinal screw rod lifting table (4), and the area-array camera (3) is over against the light guide plate and is used for photographing and detecting black spots and stains of the light guide plate;
a second camera support (8) is arranged on the fixed platform support (1), a second transverse screw rod moving platform (6) is installed on the second camera support (8) and used for adjusting the left-right distance, a second longitudinal screw rod lifting platform (7) is installed on the second transverse screw rod moving platform (6) and used for adjusting the up-down distance, a linear scanning camera (28) is installed on the second longitudinal screw rod lifting platform (7), the linear scanning camera (28) is right opposite to the light guide plate, and the linear scanning camera (28) is used for detecting the linear scratch of the light guide plate;
the detection device further comprises a second photoelectric sensor and a first photoelectric sensor.
3. The large-size light guide plate defect detecting apparatus of claim 2, wherein:
a lower lamp box support (30) is arranged on the fixed platform support (1), a lower lamp box (29) is arranged on the lower lamp box support (30), the lower lamp box (29) is positioned below the light guide plate and is opposite to the light guide plate, and the lower lamp box (29) is used for providing a light source below the light guide plate;
an upper lamp box support (14) is arranged on the fixed platform support (1), an upper lamp box (15) is installed on the upper lamp box support (14), the upper lamp box (15) is located above the light guide plate, and the upper lamp box (15) is used for providing a light source for the line scanning camera (28).
4. The large-size light guide plate defect detecting apparatus as claimed in claim 2 or 3, wherein:
the limiting device of the light guide plate line scratching and black spot defect imaging device A comprises a guide wheel mounting plate (11) and a guide wheel (12);
guide wheels (12) and guide wheel mounting plates (11) are respectively arranged on two sides of a conveying belt of a first belt conveying platform (13), the guide wheel mounting plates (11) are fixedly connected with the first belt conveying platform (13), a transverse screw rod moving platform (10) is connected with the guide wheel mounting plates (11) in a sliding mode, the guide wheels (12) are fixedly connected with the transverse screw rod moving platform (10), and the distance between the guide wheels (12) and the guide wheel mounting plates (11) is adjusted by moving the transverse screw rod moving platform (10).
5. The apparatus of claim 4, wherein:
the conveying device in the light guide plate line scratching and black spot defect imaging device A comprises a first belt conveying table (13), a second belt conveying table (37) and a third belt conveying table (18) which are sequentially arranged on a fixed platform support (1), wherein the head end, the middle end and the rear end of each conveying belt respectively correspond to the conveying belt of the first belt conveying table (13), the conveying belt of the second belt conveying table (37) and the conveying belt of the third belt conveying table (18), and the conveying belts are used for conveying light guide plates.
6. The apparatus for detecting defects of a large-size light guide plate according to any one of claims 1 to 5, wherein:
the light guide plate suction device in the light guide plate shadow and white point defect imaging device B comprises a manipulator (42), a sucker (43) is arranged on the manipulator (42), and the manipulator (42) is installed on a fixed platform support (1).
7. The apparatus of claim 6, wherein:
the light guide plate position adjusting device in the light guide plate shadow and white point defect imaging device B comprises a first positioning camera (52) and a second positioning camera (56), wherein the first coaxial light source (55) provides light for the first positioning camera (52), and the second coaxial light source (60) provides light for the second positioning camera (56);
the first positioning camera (52) and the second positioning camera (56) respectively face the left half plane below the light guide plate and the right half plane below the light guide plate.
8. The apparatus of claim 7, wherein:
the image acquisition device of the light guide plate shadow and white point defect imaging device B comprises an upper array camera (63), an upper array camera support (65), a lower array camera I (48), a lower array camera II (49), a lower array camera support (47) and an LED lamp strip (44);
an upper area-array camera support (65) is arranged right above the jig (45), an upper area-array camera (63) is arranged on the upper area-array camera support (65), the upper area-array camera (63) is right opposite to a light guide plate of the jig (45), and the upper area-array camera is used for detecting shadows and stains of the light guide plate;
a lower array camera support (47) is arranged right below the jig (45), a first lower array camera (48) and a second lower array camera (49) are respectively arranged on the lower array camera support (47), and a first lower array camera lifting platform (51) and a second lower array camera lifting platform (50) for adjusting the shooting distance of the cameras are correspondingly arranged on the first lower array camera (48) and the second lower array camera (49);
the first lower area-array camera (48) is opposite to the left half plane below the light guide plate; the second lower area-array camera (49) is opposite to the right half plane below the light guide plate and is used for detecting shadows and stains below the light guide plate;
the jig (45) is used for placing the light guide plate; the LED lamp strip (44) is located on one side of the jig (45), the LED lamp strip (44) is fixedly connected with the jig (45), and the LED lamp strip (44) is used for lighting the light guide plate.
9. A method of detection using the apparatus of any of claims 1 to 8, comprising the steps of:
firstly, the light guide plate flows through a light guide plate line scratch and black spot defect imaging device A, and the line scanning camera (28) and the area array camera (3) finish high-quality image acquisition of the light guide plate;
secondly, the light guide plate continuously flows through the light guide plate shadow and white point defect imaging device B, and the light guide plate shadow and white point image acquisition is completed by the vertical array camera and the LED lamp strip;
thirdly, the information collected by the light guide plate line scratch and black spot defect imaging device A is the line scratch, the crush damage and the black spot defect of the light guide plate; the information collected by the light guide plate shadow and white point defect imaging device B is the shadow and white point defects of the light guide plate;
and determining the defects of the light guide plate according to the data.
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