CN210982961U - Light guide plate bright spot and shadow defect detection device - Google Patents

Abstract

The utility model provides a light guide plate bright spot and shadow defect detection device: comprising a base plate, a light guide plate position correction device, a grasping device and a shadow detection device located on the top of the base plate, and a bright spot detection device located under the base plate; the grasping device It includes a front-end grabbing device and a rear-end grabbing device, which are located on the front and rear sides of the light guide plate position correction device respectively; the device is used in conjunction with the enterprise automated production line and manipulator, which improves the automation level of product production and reduces the cost of production and use; light guide plate The horizontal restraint baffle in the position correction device can automatically adjust the distance, which improves the applicability of different types of light guide plate products; Debuggable performance. The bright spot detection device and the shadow detection device share the same station, which improves the utilization rate of the station.

Description

Light guide plate bright spot and shadow defect detection device

technical field

The utility model belongs to the technical field of auxiliary equipment for automatic detection of light guide plate defects, in particular to a light guide plate defect detection device for bright spots and shadows.

Background technique

In the field of flat panel displays, liquid crystal displays (LCDs) have become mainstream products and have huge market potential. As the lighting system of LCD, backlight module has also been developed rapidly. As one of the key components of the LCD panel, the backlight module costs about 30%-50% of the cost of the LCD module, and consumes 75% of the power of the module. The backlight module is mainly composed of light source, light guide plate, reflective film, prism film and other parts. The light guide plate is an important component in the liquid crystal backlight module, and it is also one of the main technical costs of the backlight module. Therefore, the design, development and production of the light guide plate are of great significance. The light guide plate is made of optical-grade acrylic/PC sheet, and then uses high-tech materials with extremely high reflectivity and no light absorption to use laser engraving, V-shaped cross grid engraving, and UV screen printing technology on the bottom surface of the optical-grade acrylic sheet. The light guide points are printed. When the light passes through various light guide points of different density and size, the light guide plate can emit light evenly. The main function of the light guide plate is to convert a point light source or a line light source into a surface light source according to the principle of light scattering. After years of development, the light guide plate has undergone great changes in both manufacturing process and performance structure, and has made great progress .

The main defects of the light guide plate include scratches, stains, black spots, bright spots, shadows, etc. The defect detection method of the traditional light guide plate is mainly to enter the light from the side of the light guide plate, and observe the defects of the light guide plate with the naked eye. This method of identifying and judging defects by the naked eye has problems such as unstable detection quality and some defects that cannot be identified and judged due to factors such as eye fatigue and no fixed detection standards. At the same time, the manual detection method takes a lot of time, is expensive, labor-intensive, and inefficient.

Utility model content

The technical problem to be solved by the utility model is to provide a high-efficiency detection device for light guide plate bright spot and shadow defect, so as to solve the problem of low efficiency of manual inspection, high labor intensity, and no fixed inspection standard in the process of detecting bright spot and shadow defect of the light guide plate. This leads to problems such as false detection and missed detection.

In order to solve the above-mentioned technical problems, the technical scheme adopted by the present utility model is to provide a light guide plate bright spot and shadow defect detection device: comprising a base plate, a light guide plate position correction device, a grabbing device and a shadow detection device located on the base plate, and Bright spot detection device located under the bottom plate;

The grasping device includes a front-end grasping device and a rear-end grasping device, which are respectively located on the front and rear sides of the light guide plate position correction device;

The light guide plate position correction device includes a light guide plate introduction device, a position correction device and a position sensing device;

The light guide plate introduction device includes a stepping motor fixing plate fixed on the upper surface of the base plate, a stepping motor is arranged on the stepping motor fixing plate, and the stepping motor is connected with one end of the main shaft through a coupling; the other end of the main shaft Connected to the secondary shaft through a pulley block;

The pulley group is composed of a double round belt pulley and a quadruple round belt pulley that cooperate with each other;

The double round belt pulley is connected with the main shaft; the quadruple round belt pulley is connected with the auxiliary shaft;

The lateral position correcting device includes two position correcting brackets, and the head and tail ends of the main shaft and the secondary shaft are respectively fixed by the two position correcting brackets; each position correcting bracket is fixed on the bottom plate through a foot seat;

The two ends of the main shaft with gaps are respectively connected to the coupling and the pulley block after passing through a position correction bracket;

Each lateral restraint baffle is sleeved on two main shafts, and a gap is maintained between the lateral restraint baffle and the main shaft;

Two lateral restraint baffles are provided with screw nuts that match the screw; the screw is located below the main shaft; a screw handwheel is provided on the screw; the pneumatic telescopic element is fixed on the lateral pneumatic element on the position adjustment baffle; the pneumatic telescopic element, the pneumatic slider and the lateral restraint baffle are fixedly connected in sequence; two laterally arranged lateral pneumatic element position adjustment baffles are arranged below the main shaft, and the position of each lateral pneumatic element is adjusted The baffle is provided with a linear bearing II, and the fixed optical axis located between the two lateral pneumatic element position adjustment baffles is rotatably connected to the lateral pneumatic element position adjustment baffle through the linear bearing II;

The longitudinal position correction device includes a longitudinal pneumatic telescopic element support fixed on the bottom plate, and also includes a fixed optical axis, a longitudinal pneumatic telescopic element, a longitudinal pneumatic slider and a front-end positioning baffle;

A longitudinal pneumatic expansion element is provided on the longitudinal pneumatic expansion element support, and the longitudinal pneumatic expansion element is fixedly connected with the longitudinal pneumatic slider; the front-end positioning baffle is fixedly connected with the longitudinal pneumatic slider;

The position sensing device includes a sensor support, which is fixedly connected to the bottom plate; the photoelectric sensor is fixedly connected to the sensor support; the sensor support is located just below the front-end positioning baffle;

The front-end grabbing device includes two pneumatic guide rail frames I arranged longitudinally and fixedly mounted on the bottom plate, two ends of the pneumatic guide rail I are respectively fixedly connected with the tops of the two pneumatic guide rail frames I; The pneumatic guide rail I slider; the suction cup manipulator I, the pneumatic expansion element I and the middle rib plate I are connected in sequence, and the middle rib plate I is fixedly connected with the pneumatic guide rail I slider;

The rear-end grabbing device includes two pneumatic guide rail frames II arranged longitudinally and fixedly mounted on the bottom plate, the two ends of the pneumatic guide rail II are respectively fixedly connected with the upper ends of the two pneumatic guide rail frames II; The connected pneumatic guide rail slider II, the suction cup manipulator II, the pneumatic expansion element II and the middle rib plate II are connected in sequence, and the middle rib plate II is fixedly connected with the pneumatic guide rail slider II;

The shadow detection device includes a camera bracket, a screw lifting platform, an upper camera, an optical axis, a pneumatic element, a linear bearing I, a lower baffle, an upper baffle, a slider, a lower camera fixing plate and a bracket;

Fix the mounting bracket on the base plate; the camera bracket is fixed on the bracket

The screw lifting platform is vertically installed on the camera bracket; the screw lifting platform is slidably connected with the slider, a lower camera fixing plate is arranged on the slider, and the upper camera is connected with the lower camera fixing plate;

The optical axis is connected with the upper baffle and the lower baffle through the linear bearing I and is fixed on the bracket, and the pneumatic element is respectively connected with the upper baffle and the lower baffle;

The bright spot detection device includes a workbench, a lens baffle, a lower camera fixing plate, a manual displacement stage, a lower camera bracket and a lower camera; the lower camera fixing plate is fixedly mounted on the lower end of the base plate;

The worktable is a hollow box structure, and the bottom plate is provided with an opening of the same size corresponding to the inner cavity of the worktable; the worktable is fixedly connected to the bottom plate, and the center line of the worktable coincides with the center line of the bottom plate opening;

The lower camera fixing plate is fixedly installed on the lower surface of the bottom plate; a manual displacement stage is arranged on the lower camera fixing plate, and the manual displacement stage can move relative to the lower camera fixing plate in a vertical direction; a lower camera bracket is arranged on the manual displacement stage , the lower camera is installed on the lower camera bracket, and the lower camera is facing the workbench.

As an improvement to the light guide plate bright spot and shadow defect detection device of the present utility model:

Both the main shaft and the auxiliary shaft are provided with cams.

As a further improvement to the light guide plate bright spot and shadow defect detection device of the present utility model:

Four cams are provided on each spindle.

As a further improvement to the light guide plate bright spot and shadow defect detection device of the present utility model:

Two laterally arranged lateral restraint baffles are arranged between the two position correction brackets, and the cams fixedly connected with the main shaft and the auxiliary shaft are located between the two lateral restraint baffles.

As a further improvement to the light guide plate bright spot and shadow defect detection device of the present utility model:

The fixed optical axis is located just below the main shaft and is on the same plane as the screw rod; the fixed optical axis and the screw rod are both parallel to the main shaft.

As a further improvement to the light guide plate bright spot and shadow defect detection device of the present utility model:

The longitudinal position correcting device and the lateral position correcting device are located on the same plane and are perpendicular to each other.

It is beneficial to provide the applicability of the whole system to different types of light guide plates; when the device performs bright spot defect detection, the system controls the pneumatic components on the upper shadow defect detection device to open the upper baffle and close the lower baffle, and the area scan camera is located on the workbench. The light guide plate is photographed, and the system performs image processing and analysis on the collected light guide plate image to detect whether there is a bright spot defect in the light guide plate.

The advantages of the utility model are: the device is used in conjunction with the enterprise automated production line and the manipulator, which improves the automation level of product production and reduces the production and use cost; The applicability of different types of light guide plate products; the spatial position of the area scan camera in the bright spot detection device and the shadow detection device can be automatically adjusted, which improves the debug performance of the entire device. The bright spot detection device and the shadow detection device share the same station, which improves the utilization rate of the station, saves the detection time of the light guide plate, further improves the production efficiency of the light guide plate, and reduces the inspection cost of the product.

Description of drawings

The specific embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings.

Fig. 1 is the three-dimensional structure schematic diagram of the present utility model;

Fig. 2 is the top schematic view of Fig. 1;

Fig. 3 is the schematic diagram of the light guide plate position correcting device viewed in the direction of arrow 1 in Fig. 1;

FIG. 4 is a partially rotated schematic view of the C-C section in FIG. 3 .

5 is a schematic structural diagram of the shadow detection device viewed in the direction of arrow 2 in FIG. 1;

Fig. 6 is a schematic diagram of the structure of the shadow detection device in the direction indicated by arrow A in Fig. 5;

FIG. 7 is a schematic structural diagram of a bright spot detection device viewed from the direction of arrow 3 in FIG. 1 .

In the picture: 3-1 camera bracket, 3-2 screw lift table, 3-3 camera, 3-4 two optical axes, 3-5 pneumatic components, 3-6 linear bearing I, 3-7 lower baffle, 3-8 Upper baffle, 3-9 Pneumatic guide rail I, 3-10 Middle rib plate 1, 3-11 Pneumatic expansion element I, 3-12 Suction cup manipulator I, 3-13 Pneumatic guide rail frame 1, 3-14 Pneumatic guide rail frame 2. 3-15 Pneumatic guide rail II, 3-16 Middle rib plate 2, 3-17 Pneumatic expansion element II, 3-18 Suction cup manipulator II, 3-19 Pneumatic guide rail I slider, 3-20 Pneumatic guide rail slider II, 3 -21 worktable, 3-22 stepper motor, 3-23 position correction bracket 2 pieces, 3-24 coupling, 3-25 spindle, 3-26 cam 30 pieces, 3-27 double round belt pulley 1 piece , 3-28 10 four-faced round belt pulleys, 3-29 10 secondary shafts, 3-30 screw handwheel, 3-31 2 lateral restraint baffles, 3-32 bottom plate, 3-33 stepper motor fixed Plate, 4 3-34 feet, 3-35 front-end positioning baffle, 3-36 pneumatic slider, 3-37 pneumatic expansion element, 3-38 photoelectric sensor, 3-39 sensor support, 3-40 lead screw , 3-41 2 fixed optical shafts, 3-42 Pneumatic expansion element support, 3-43 2 pieces of transverse pneumatic element position adjustment baffles, 3-44 Linear bearing II, 3-45 2 pieces of baffles, 3-46 Pneumatic telescopic element, 3-47 pneumatic slider, 2 3-48 screw nuts, 3-49 slider, 3-50 lower camera fixing plate, 3-51 manual stage, 3-52 lower camera bracket, 3 -53 cameras.

Detailed ways

In the present invention, the direction parallel to the main shaft 3-25 is referred to as the transverse direction; the direction perpendicular to the main shaft 3-25 is referred to as the longitudinal direction. The direction in which the light guide plate is introduced into the device is vertical.

The present utility model is further described below in conjunction with specific embodiments, but the protection scope of the present utility model is not limited to this:

Embodiment 1, a light guide plate bright spot and shadow defect detection device,

It includes a base plate 3-32, a light guide plate position correction device, a grabbing device and a shadow detection device located above the base plate 3-32, and a bright spot detection device located below the base plate 3-32;

1. The light guide plate position correction device includes a light guide plate introduction device, a position correction device and a position sensing device;

1.1. The light guide plate introduction device includes a stepping motor fixing plate 3-33 fixed on the upper surface of the bottom plate 3-32, and a stepping motor 3-22 is arranged on the stepping motor fixing plate 3-33, so The stepping motor 3-22 is connected with one end of the main shaft 3-25 through the coupling 3-24; the other end of the main shaft 3-25 is connected with at least 10 auxiliary shafts 3-29 through the pulley group; It is composed of matching double round belt pulley 3-27 and quadruple round belt pulley 3-28;

The double round belt pulley 3-27 is connected with the main shaft 3-25; the quadruple round belt pulley 3-28 is connected with each auxiliary shaft 3-29; the main shaft 3-25 is fixed with the main shaft 3-25 Connected cams 3-26; four cams 3-26 are arranged on each main shaft 3-25; several cams 3-26 are also arranged on the secondary shaft 3-29.

In this way, the main shaft 3-25 and the auxiliary shaft 3-29 are connected through the double round belt pulley 3-27 and the four-face round belt pulley 3-28. When the system is working, the stepping motor drives the main shaft 3-25 and then drives the auxiliary shaft 3. -29 Send the light guide plate into the position correction device;

Note: In actual work, place the light guide plate on the cam 3-26.

The function of the secondary shaft 3-29 is mainly to drive the cam 3-26 to rotate, and then transmit the light guide plate located on the cam 3-29 forward, and also has the function of carrying the light guide plate to prevent the light guide plate from being scratched twice. The secondary shaft 3-29 will be passively moved, that is, driven by the pulley 3-28.

1.2. The position correction device includes a horizontal position correction device and a vertical position correction device;

The lateral position correcting device includes two position correcting brackets 3-23 arranged laterally and fixedly mounted on the base plate 3-32. -23 fixed. Each position correction bracket 3-23 is fixed on the base plate 3-32 through 4 feet 3-34. The function of the position correction bracket 3-23 is to fix 1 main shaft 3-25, 10 auxiliary shafts 3-29, wire The rod 3-40, 2 fixed optical axes 3-41, and 2 baffles 3-45 play the role of carrying the entire position correction device.

The stepping motor fixing plate 3-33 and the four feet 3-34 are fixedly installed on the base plate 3-32, so as to stably support the position correction device of the entire light guide plate.

Two lateral restraint baffles 3-31 are arranged between the two position correction brackets 3-23, and the cams 3-26 fixedly connected to the main shaft 3-25 and the auxiliary shaft 3-29 are located in the two lateral restraints Between the baffles 3-31, the number of cams 3-26 is 30, and the positions of the cams 3-26 on the sub-shaft 3-29 are randomly set to drive the light guide plate to move;

The two ends of the main shaft 3-25 with a gap respectively pass through a position correction bracket 3-23 and are respectively connected with the coupling 3-24 and the pulley block; that is, the main shaft 3-25 is not connected with the position correction bracket 3-23;

Each lateral restraint baffle 3-31 is sleeved on the two main shafts 3-25, and a gap is maintained between the lateral restraint baffle 3-31 and the main shaft 3-25, that is, the lateral restraint baffle 3-31 and the main shaft 3- 25 is not connected.

The two lateral restraint baffles 3-31 are provided with lead screw nuts 3-48 that match the lead screws 3-40, that is, the lead screws 3-40 rely on the lead screw nuts 3-48 and the lateral restraint baffles 3-31 is connected in rotation; the screw 3-40 is provided with a screw hand wheel 3-30; before the device works, the distance between the two lateral restraint baffles 3-31 can be adjusted through the screw hand wheel 3-30 In order to achieve the purpose of adapting to the defect detection of different types of light guide plates. The screw 3-40 is located below the main shaft 3-25. The pneumatic telescopic element 3-46 and the pneumatic slider 3-47 are fixedly connected to the lateral restraint baffle 3-31 in sequence; when the device is working, the control system controls the pneumatic expansion and contraction element 3-46 to expand and contract horizontally, and the pneumatic slider 3-47 drives the lateral pneumatic The element position adjusting baffle 3-43 performs lateral reciprocating motion, thereby correcting the lateral position of the light guide plate in the two-dimensional plane; the pneumatic telescopic element 3-46 is fixed on the lateral pneumatic element position adjusting baffle 3-43.

Two transverse pneumatic element position adjustment baffles 3-43 are arranged below the main shaft 3-25, and linear bearings II 3-44 are arranged on each transverse pneumatic element position adjustment baffle 3-43, located in the two transverse The fixed optical axis 3-41 between the position adjusting baffles 3-43 of the pneumatic components is rotatably connected with the position adjusting baffles 3-43 of the transverse pneumatic components through the linear bearing II 3-44;

The fixed optical axis 3-41 is located below the main shaft 3-25 and is on the same plane as the screw rod 3-40; the position of the fixed optical axis 3-41 and the screw rod 3-40 in the longitudinal direction is set: fixed optical axis 3-41 , screw 3-40, fixed optical axis 3-41. The fixed optical axis 3-41 and the screw rod 3-40 are parallel to the main shaft 3-25. The function of the fixed optical axis 3-41 is to fix the position adjustment baffle 3-43 of the lateral pneumatic element to prevent the lateral restraint baffle 3-31 from shaking.

The longitudinal position correction device includes a longitudinal pneumatic telescopic element support 3-42 fixed on the bottom plate 3-32, and also includes a fixed optical axis 3-41, a longitudinal pneumatic telescopic element 3-37, a longitudinal pneumatic slider 3-36 and Front positioning baffle 3-35,

A longitudinal pneumatic expansion element 3-37 is provided on the longitudinal pneumatic expansion element support 3-42, and the longitudinal pneumatic expansion element 3-37 is fixedly connected with the longitudinal pneumatic slider 3-36; the front-end positioning baffle 3-35 is connected with the longitudinal pneumatic slider 3-36. Blocks 3-36 are fixedly connected;

The entire longitudinal position correcting device and the entire lateral position correcting device are located on the same plane and are perpendicular to each other.

1.3. The position sensing device includes a sensor support 3-39, which is fixedly connected to the bottom plate 3-32; the photoelectric sensor 3-38 is fixedly connected to the sensor support 3-39; the sensor support 3-39 is located in The front-end positioning baffle 3-35 in the longitudinal position correction device is just below.

2. The grasping device includes a front-end grasping device and a rear-end grasping device, which are respectively located on the front and rear sides of the light guide plate position correction device.

The front-end grabbing device includes two pneumatic guide rail frames I3-13 arranged longitudinally and fixedly installed on the bottom plate 3-32. The two ends of the pneumatic guide rail I3-9 are respectively connected with the top of the two pneumatic guide rail frames I3-13; I3-9 is provided with a pneumatic guide rail I slider 3-19 which is slidably connected to it; the suction cup manipulator I3-12, the pneumatic expansion element I3-11 and the middle rib plate I3-10 are connected in sequence, and the middle rib plate I3-10 is connected with the pneumatic guide rail. ⅠSliders 3-19 are fixedly connected.

The rear-end grabbing device includes two pneumatic guide rail frames II3-14 arranged longitudinally and fixedly installed on the bottom plate 3-32. The two ends of the pneumatic guide rail II3-15 are respectively connected with the upper ends of the two pneumatic guide rail frames II3-14; The guide rail II3-15 is provided with a pneumatic guide rail slider II3-20 which is slidably connected to it. The suction cup manipulator II3-18, the pneumatic expansion element II3-17 and the middle rib plate II3-16 are connected in sequence, and the middle rib plate II3-16 is connected with the pneumatic guide rail. The slider II3-20 is fixedly connected.

The sliding block 3-19 of the pneumatic guide rail I controls the longitudinal movement of the suction cup manipulator I3-12, and the telescopic movement of the pneumatic telescopic element I3-11 controls the up and down movement of the suction cup manipulator I3-12 in space. The light plate is drawn from the light guide plate position correction device and placed on the workbench 3-21.

The installation method of the rear-end grabbing device is the same as that of the front-end grabbing device, that is, the pneumatic guide rail slider II3-20 controls the longitudinal movement of the suction cup manipulator II3-18, and the telescopic motion of the pneumatic telescopic element II3-17 controls the suction cup manipulator II3 -18 moves up and down in space, the main function of the rear-end grabbing device is to pick up the light guide plate on the workbench and place it to the next station.

The pneumatic guide rail frame I3-13 and the pneumatic guide rail frame II3-14 play the role of stabilizing the entire grasping device.

3. As shown in Figure 5 and Figure 6:

The shadow detection device includes camera bracket 3-1, screw lifting platform 3-2, upper camera 3-3, optical axis 3-4, pneumatic component 3-5, linear bearing I3-6, lower baffle 3-7, upper baffle 3-8, slider 3-49, lower camera fixing plate 3-50 and bracket 3-54;

The mounting bracket 3-54 is fixed on the base plate 3-32; the camera bracket 3-1 is fixedly installed on the bracket 3-54, the function of the bracket 3-54 is to stably support the entire hidden defect detection device; the camera bracket 3-1 is used for Steady on camera 3-3.

The screw lifting platform 3-2 is vertically installed on the camera bracket 3-1. The screw lifting platform 3-2 is slidably connected with the slider 3-49, the lower camera fixing plate 3-50 is set on the slider 3-49, and the upper camera 3-3 is connected with the lower camera fixing plate 3-50; it can be adjusted by adjusting The position of the slider 3-49 on the screw lifting platform 3-2 can adjust the up and down position of the upper camera 3-3 in space, that is, the up and down movement of the slider 3-49 in the screw lifting platform 3-2 is adjusted. The upper and lower positions of the upper camera 3-3 in space.

The optical axis 3-4 is connected with the upper baffle 3-8 and the lower baffle 3-7 through the linear bearing I3-6 and is fixed on the bracket 3-54, and the pneumatic element 3-5 is respectively connected with the upper baffle 3-8, The lower baffles 3-7 are connected, and the opening and closing of the upper baffles 3-8 and the lower baffles 3-7 are controlled by the expansion and contraction of the pneumatic element 3-5;

The opening and closing of the upper and lower baffles in the axial direction of the optical axis 3-4 is controlled by the expansion and contraction of the pneumatic element 3-5, that is, when the pneumatic element 3-5 is in the initial state, the upper and lower baffles are closed, and the pneumatic element 3-5 is in the closed state. 5 When in a contracted state. The upper and lower baffles are open.

When the device detects shadow defects, the system controls the pneumatic element 3-5 to open the lower baffle 3-7 and close the upper baffle 3-8, and the area scan camera takes pictures of the light guide plate located on the workbench 3-21, The collected images are processed and analyzed to detect whether there are shadow defects in the light guide plate.

4. The bright spot detection device includes a worktable 3-21, a lens baffle 3-55, a lower camera fixing plate 3-50, a manual displacement stage 3-51, a lower camera bracket 3-52, and a lower camera 3-53; the lower camera is fixed The plate 3-50 is fixedly installed on the lower end of the bottom plate 3-32, and is used to stably support the bright spot defect detection device.

The workbench 3-21 is a hollow box structure, and the bottom plate 3-32 has an opening of the same size corresponding to the inner cavity of the workbench 3-21; the workbench 3-21 is fixedly connected to the bottom plate 3-32, and the workbench The center line of 3-21 coincides with the center line of the opening of the bottom plate 3-32; the workbench 3-21 is used for placing the light guide plate.

The lower camera fixing plate 3-50 is fixedly installed on the lower surface of the base plate 3-32; a manual displacement stage 3-51 is arranged on the lower camera fixing plate 3-50, and the manual displacement stage 3-51 can be opposite to the lower camera fixing plate 3-50 Make relative movement in the vertical direction; set the lower camera bracket 3-52 on the manual stage 3-51, the lower camera 3-53 is installed on the lower camera bracket 3-52, and adjust the manual stage 3-51 to adjust the position of the lower camera The upper and lower positions in space. The lower camera 3-53 is facing the workbench 3-21.

The cameras used in the present invention are all area scan cameras.

The entire bright spot detection device is located directly below the above-mentioned dark detection device.

In actual work, the device of the present invention is connected to the enterprise automatic production line, and the transmission device on the enterprise automatic production line transmits the light guide plate to be inspected to the light guide plate bright spot and shadow defect detection device; the following control system belongs to the prior art , and therefore will not be described in detail in the present invention. The specific working process is as follows:

1. The light guide plate enters the position correction device of the light guide plate, the lateral position of the light guide plate in the two-dimensional plane is adjusted by the lateral position adjustment device, and the longitudinal position of the light guide plate in the two-dimensional plane is adjusted by the longitudinal position adjustment device;

Specifically:

The light guide plate is placed on the cam 3-26. Under the transmission action of the main shaft 3-25 and the auxiliary shaft 3-29, the light guide plate moves in a straight line perpendicular to the direction of the main shaft 3-25 and the auxiliary shaft 3-29;

The adjustment of the lateral position adjustment device is as follows: after the light guide plate enters the position correction device, it moves in a straight line to just above the photoelectric sensor 3-38, triggers the sensor, and the control system controls the two pneumatic expansion elements 3-46 to stretch in the lateral direction. Thereby, the two pneumatic sliders 3-47 connected to it and the two lateral restraint baffles 3-31 fixedly connected with the pneumatic slider 3-47 are driven to stretch in the lateral direction, and the two lateral restraint baffles 3 -31 Make relative movement in the lateral direction to clamp the light guide plate located on the cam 3-26, and then the pneumatic telescopic element 3-46, the pneumatic slider 3-47, and the lateral restraint baffle 3-31 follow the same way as above Shrink, and the lateral position of the light guide plate is adjusted.

The specific adjustment of the longitudinal position adjusting device is similar to the specific adjustment method of the above-mentioned lateral position adjusting device, that is, after the light guide plate enters the position correcting device, it moves in a straight line to just above the photoelectric sensor 3-38 to trigger the sensor. The control system controls the pneumatic telescopic element 3-37 to shrink in the longitudinal direction, and drives the pneumatic slider 3-36 slidably connected with it and the front-end positioning baffle 3-35 fixedly connected with the pneumatic slider to shrink in the longitudinal direction. Movement, the front-end positioning baffle 3-35 cooperates with the lateral position adjustment device to tighten the light guide plate to limit the position of the light guide plate in the longitudinal direction, and then the pneumatic telescopic element 3-37, the pneumatic slider 3-36, and the front-end positioning baffle 3-35 Extend in the same way as above, and the longitudinal position of the light guide plate is adjusted.

After the light guide plate enters the position correction device, the sensor is triggered, and the two lateral restraint baffles 3-31 and front-end positioning baffles 3-35 clamp the light guide plate in three directions, and then release, and the position correction is completed.

2. After the light guide plate enters the position correction device, it moves in a straight line to the top of the photoelectric sensor 3-38 to trigger the sensor. After the trigger signal enters the control system, an additional delay signal is added. The suction cup manipulator 3-18 directly above the light guide plate sucks the light guide plate. After the adjustment of the position of the light guide plate in the two-dimensional plane is completed, the photoelectric sensor 3-38 located at the end of the light guide plate position correction device is triggered, and the trigger signal of the photoelectric sensor is transmitted to the device control system. Describe in detail.

3. The control system controls the front-end grabbing device to move to the upper end of the light guide plate, and the suction cup manipulator of the front-end grabbing device absorbs the light guide plate and places the light guide plate on the workbench; that is, the control system controls the front-end grabbing device to move to the front of the light guide plate. Above, the suction cup manipulator of the front-end grabbing device sucks the light guide plate and places the light guide plate on the workbench; that is, the control system controls the pneumatic guide rail I slider 3-19 to move to the upper end of the light guide plate along the pneumatic guide rail I3-9 direction, and the pneumatic The telescopic element I3-11 stretches in the up-down direction, the suction cup manipulator I3-12 fixedly connected with the pneumatic telescopic element I3-11 moves downward, and the suction cup manipulator I3-12 absorbs the light guide plate; then the pneumatic guide rail I slide block 3-19 moves along the pneumatic The guide rail I3-9 moves to the top of the workbench 3-21, the pneumatic telescopic element I3-11 stretches down, the suction cup manipulator I3-12 connected to it moves downward, and the suction cup manipulator I3-12 places the light guide plate on the workbench Inside the notch 3-21, the front-end grabbing device is finished.

The control system controls the closing of the upper baffle, specifically: the control system manipulates the pneumatic element 3-5 to make a stretching movement along the axial direction of the optical axis 3-4, thereby realizing the closing of the upper baffle; at this time, the surface located at the lower end of the worktable The array camera collects the image of the light guide plate, which is mainly used for the detection of bright spot defects of the light guide plate.

After the acquisition of the lower end area scan camera is completed, the control system controls the opening of the upper baffle and the closing of the lower baffle. Specifically, the control system manipulates the pneumatic components 3-5 to perform telescopic movement along the optical axis 3-4 in the axial direction, so as to realize the upper and lower baffles. The baffle is opened and the lower baffle is closed; at this time, the area scan camera located at the upper end of the workbench starts to collect the image of the light guide plate, and the collected image is mainly used for the detection of shadow defects of the light guide plate;

After the image collection is completed, the system performs image processing and analysis on the collected images, and can detect bright spots and shadow defects on the light guide plate.

The acquisition of the light guide plate image by the area scan camera and the subsequent image processing and analysis belong to the prior art, and therefore will not be described in detail in the present invention.

4. The control system controls the rear end grabbing device to move to the upper end of the worktable, and the suction cup manipulator grabs the detected light guide plate and places the light guide plate to the next station. That is, the control system controls the pneumatic guide rail slider II3-20 to move to the top of the worktable 3-21 along the pneumatic guide rail II3-15 direction, and the pneumatic telescopic element II3-17 extends downward and is fixedly connected with the pneumatic telescopic element II3-17. The suction cup manipulator II3-18 moves downward, the suction cup manipulator II3-18 absorbs the light guide plate located on the worktable 3-21, and then the pneumatic telescopic element II3-17 contracts upward, and the suction cup manipulator II3-18 connected to it moves upward, driving the The light guide plate is separated from the workbench 3-21, and the pneumatic guide rail II3-20 moves to the next station along the direction of the pneumatic guide rail II3-15.

After the above operations, high-quality images can be collected and detected through automated operations, and products with bright spots and shadow defects can be screened out, thereby further improving the production efficiency of light guide plate products.

The specific implementation cases described in this document are only examples to illustrate the spirit of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the described specific embodiments or replace them in similar ways, but will not deviate from the spirit of the present invention or go beyond the appended claims the defined range.

Although the terms such as pneumatic guide rail, pneumatic telescopic element, pneumatic slider, and suction cup manipulator are used more in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; it is contrary to the spirit of the present invention to interpret them as any kind of additional limitations.

Claims (6)

1. The light guide plate bright spot and shadow defect detection device is characterized in that: comprising a base plate (3-32), a light guide plate position correcting device, a grabbing device and a shadow detection device located on the base plate (3-32), and a base plate (3-32). 3-32) the following bright spot detection device; The grasping device includes a front-end grasping device and a rear-end grasping device, which are respectively located on the front and rear sides of the light guide plate position correction device; The light guide plate position correction device includes a light guide plate introduction device, a position correction device and a position sensing device; The light guide plate introduction device includes a stepping motor fixing plate (3-33) fixed on the upper surface of the bottom plate (3-32), and a stepping motor (3-33) is provided on the stepping motor fixing plate (3-33). 22), the stepper motor (3-22) is connected with one end of the main shaft (3-25) through the coupling (3-24); the other end of the main shaft (3-25) is connected with the auxiliary shaft (3-29) through the pulley block connected; The pulley set is composed of a pair of round belt pulleys (3-27) and a quadruple round belt pulley (3-28) that cooperate with each other; The double round belt pulley (3-27) is connected with the main shaft (3-25); the quadruple round belt pulley (3-28) is connected with the secondary shaft (3-29); The lateral position correction device includes two position correction brackets (3-23), and the fore and aft ends of the main shaft (3-25) and the auxiliary shaft (3-29) are respectively fixed by two position correction brackets (3-23); each The position correction brackets (3-23) are all fixed on the base plate (3-32) through the feet (3-34); The two ends of the main shaft (3-25) with gaps respectively pass through a position correction bracket (3-23) and are respectively connected with the coupling (3-24) and the pulley block; Each lateral restraint baffle (3-31) is sleeved on the two main shafts (3-25), and a gap is maintained between the lateral restraint baffle (3-31) and the main shaft (3-25); A lead screw nut (3-48) matching the lead screw (3-40) is provided on the two lateral restraint baffles (3-31); the lead screw (3-40) is located on the main shaft (3-40) 25); the screw handle (3-30) is provided on the screw (3-40); the pneumatic telescopic element (3-46) is fixed on the horizontal pneumatic element position adjustment baffle (3-43) ; The pneumatic telescopic element (3-46), the pneumatic slider (3-47) and the lateral restraint baffle plate (3-31) are fixedly connected in turn; two laterally arranged horizontal blocks are arranged below the main shaft (3-25) Pneumatic element position adjustment baffles (3-43), linear bearings II (3-44) are provided on each lateral pneumatic element position adjustment baffles (3-43), located on two lateral pneumatic element position adjustment baffles ( The fixed optical axis (3-41) between 3-43) is rotatably connected to the horizontal pneumatic element position adjusting baffle (3-43) through the linear bearing II (3-44); The longitudinal position correction device includes a longitudinal pneumatic expansion element support (3-42) fixed on the bottom plate (3-32), and also includes a fixed optical axis (3-41), a longitudinal pneumatic expansion element (3-37), a longitudinal pneumatic expansion element (3-37), and a longitudinal pneumatic expansion element (3-37). Slider (3-36) and front-end positioning baffle (3-35); A longitudinal pneumatic expansion element (3-37) is provided on the longitudinal pneumatic expansion element support (3-42), and the longitudinal pneumatic expansion element (3-37) is fixedly connected with the longitudinal pneumatic slider (3-36). The positioning baffle (3-35) is fixedly connected with the longitudinal pneumatic slider (3-36); The position sensing device comprises a sensor support (3-39), which is fixedly connected to the base plate (3-32); the photoelectric sensor (3-38) is fixedly connected to the sensor support (3-39); the sensor support (3-39) is located just below the front-end positioning baffle (3-35); The front-end grabbing device includes two pneumatic guide rail frames I (3-13) arranged longitudinally and fixedly mounted on the bottom plate (3-32), and two ends of the pneumatic guide rail I (3-9) are respectively connected with the two pneumatic guide rails. The top of the frame I (3-13) is fixedly connected; the pneumatic guide rail I (3-9) is provided with a pneumatic guide rail I slider (3-19) that is slidably connected to it; the suction cup manipulator I (3-12), the pneumatic expansion element I (3-11) and the middle rib plate I (3-10) are connected in sequence, and the middle rib plate I (3-10) is fixedly connected with the pneumatic guide rail I slider (3-19); The rear end grabbing device includes two pneumatic guide rail frames II (3-14) arranged longitudinally and fixedly installed on the bottom plate (3-32), and two ends of the pneumatic guide rail II (3-15) are respectively connected with the two pneumatic guide rails II (3-15). The upper end of the guide rail frame II (3-14) is fixedly connected; the pneumatic guide rail II (3-15) is provided with a pneumatic guide rail slider II (3-20) which is slidably connected to it, the suction cup manipulator II (3-18), and the pneumatic telescopic element. II (3-17) and the middle rib plate II (3-16) are connected in sequence, and the middle rib plate II (3-16) is fixedly connected with the pneumatic guide rail slider II (3-20); The shadow detection device includes a camera bracket (3-1), a screw lifting platform (3-2), an upper camera (3-3), an optical axis (3-4), a pneumatic element (3-5), and a linear bearing I (3-6), lower baffle (3-7), upper baffle (3-8), slider (3-49), lower camera fixing plate (3-50) and bracket (3-54); Fix the mounting bracket (3-54) on the base plate (3-32); fix the camera bracket (3-1) on the bracket (3-54) The screw lifting platform (3-2) is vertically installed on the camera bracket (3-1); the screw lifting platform (3-2) is slidably connected to the slider (3-49), and is connected to the slider (3-49). 3-49) A lower camera fixing plate (3-50) is arranged on the upper part, and the upper camera (3-3) is connected with the lower camera fixing plate (3-50); The optical axis (3-4) is connected to the upper baffle (3-8) and the lower baffle (3-7) through the linear bearing I (3-6) and is fixed on the bracket (3-54), and the pneumatic The element (3-5) is respectively connected with the upper baffle plate (3-8) and the lower baffle plate (3-7); The bright spot detection device includes a worktable (3-21), a lens baffle (3-55), a lower camera fixing plate (3-50), a manual displacement stage (3-51), and a lower camera bracket (3-52) and a lower camera (3-53); the lower camera fixing plate (3-50) is fixedly mounted on the lower end of the bottom plate (3-32); The worktable (3-21) is a hollow box structure, and the bottom plate (3-32) is provided with an opening of the same size corresponding to the inner cavity of the worktable (3-21); the worktable (3-21) is fixed Connected to the bottom plate (3-32), the center line of the workbench (3-21) coincides with the center line of the opening of the bottom plate (3-32); The lower camera fixing plate (3-50) is fixedly installed on the lower surface of the base plate (3-32); a manual displacement stage (3-51) is arranged on the lower camera fixing plate (3-50), and the manual displacement stage (3- 51) It can move relative to the lower camera fixing plate (3-50) in the vertical direction; set the lower camera bracket (3-52) on the manual stage (3-51), and install the lower camera On the lower camera bracket (3-52), the lower camera (3-53) is facing the workbench (3-21). 2. The light guide plate bright spot and shadow defect detection device according to claim 1, wherein: Both the main shaft (3-25) and the auxiliary shaft (3-29) are provided with cams (3-26). 3. The light guide plate bright spot and shadow defect detection device according to claim 2, wherein: Four cams (3-26) are provided on each spindle (3-25). 4. The light guide plate bright spot and shadow defect detection device according to claim 3, wherein: Two laterally arranged lateral restraint baffles (3-31) are arranged between the two position correction brackets (3-23), and a cam (3-31) is fixedly connected to the main shaft (3-25) and the auxiliary shaft (3-29). -26) are located between the two lateral restraint baffles (3-31). 5. The light guide plate bright spot and shadow defect detection device according to claim 4, wherein: The fixed optical axis (3-41) is located just below the main shaft (3-25), and is located on the same plane as the lead screw (3-40); The fixed optical axis (3-41) and the screw rod (3-40) are parallel to the main shaft (3-25). 6. The light guide plate bright spot and shadow defect detection device according to claim 5, wherein: The longitudinal position correcting device and the lateral position correcting device are located on the same plane and are perpendicular to each other.

Images