LED package surface defect intelligent detection device

Abstract

The application discloses a kind of LED packaging surface defect intelligent detection devices, it includes: workbench, one side is provided with feeding table;Material taking manipulator is set in workbench and is suspendedly installed above transport guide rail;Tray is rotatably installed in the inside of workbench, the upper end surface of the tray is evenly provided with multiple grooves;Visual inspection component is set in workbench and is located at the periphery of tray;Sorting unit is set at the periphery of tray and is located at the downstream station of visual inspection component;LED packaging surface defect intelligent detection device in the application, feeding table is sent into workbench by transport guide rail after glue filling molding LED, LED can be temporarily fixed by material taking manipulator one by one into the groove of tray, flexible substrate used in groove can be powered on to light LED on one hand, on the other hand, it can realize LED packaging surface posture dynamics in flexible deformation, and it is convenient for visual inspection component to carry out multi-angle detection.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of LED detection, and specifically relates to an intelligent LED packaging surface defect detection device. BACKGROUND

[0002] After the existing LED packaging die bonding, the insufficient glue pouring may cause the chip leakage, the poor wire printing, and the chip non-power-on phenomenon caused by die bonding; in the traditional technology, the production factory adopts the power lightening LED light source mode, workers detect whether the chip leakage and non-power-on phenomenon exist after the die bonding by using the naked eye, the mode is slow and low in efficiency, is difficult to match the rhythm of the automatic production line, a large number of skilled inspectors need to be invested, the labor cost is high, and the judgment standard is not the same due to fatigue, individual differences and other factors; secondly, whether the artificial detection or the simple fixed camera detection, usually only the LED packaging surface can be observed from a single angle (such as directly above), the single visual angle is easy to miss the defects (such as scratches, bubbles and stains) existing on the side, curved surface or specific angle; and in order to adjust the product angle or carry out the power-on test, the visual detection equipment usually adopts the hard fixture or probe frequently contacting the product surface, which has the risk of scratching, pressure loss or electrostatic damage for the small LED packaging body. SUMMARY

[0003] To achieve the above object, the application provides the following technical scheme: an LED packaging surface defect intelligent detection device, which comprises:

[0004] A workbench is provided with a feeding table on one side, and a conveying guide rail is horizontally connected between the feeding table and the workbench;

[0005] A material taking manipulator is arranged in the workbench and suspended above the conveying guide rail;

[0006] A material disc is rotatably installed in the interior of the workbench, and a plurality of material grooves are uniformly arranged on the upper end face of the material disc;

[0007] A visual detection assembly is arranged in the workbench and located at the periphery of the material disc;

[0008] A sorting unit is arranged at the periphery of the material disc and located at the downstream station of the visual detection assembly, and a material distribution box is arranged on the side of the workbench away from the feeding table.

[0009] Further, as a preferred, the visual detection assembly is arranged in three groups, and appearance detection, scratch detection and optical performance detection are sequentially carried out on the LED.

[0010] Further, as a preferred, the visual detection assembly comprises:

[0011] A support column has its upper end surface fixed vertically with a lighting device through an L-shaped bracket;

[0012] An adjusting plate is horizontally installed on the support column, and a sliding groove is formed on the side wall of the adjusting plate, and a fixing plate is slidingly installed outside the sliding groove;

[0013] A CCD industrial camera is vertically installed on the fixing plate.

[0014] Further, as a preferred, a flexible substrate is horizontally arranged in the trough, two probe contacts are symmetrically arranged on the flexible substrate, the probe contacts are in contact with the LED pins, and two convex edges are symmetrically distributed on the inner wall of the trough and are pressed on the upper ends of the LED pins;

[0015] A plurality of guide cavities are circumferentially distributed below the flexible substrate in the trough, and a guide support rod is slidingly installed in each guide cavity, and the upper end of the guide support rod is in contact with the flexible substrate.

[0016] Further, as a preferred, a fixing groove is formed in the middle of the trough, and the guide support rod is located in the fixing groove;

[0017] A hydraulic cavity is arranged below the guide cavity, the hydraulic cavity is filled with hydraulic oil, and a hydraulic pipe is arranged outside the hydraulic cavity.

[0018] Further, as a preferred, the sorting unit comprises:

[0019] A three-axis frame is fixed in the workbench, and two sliding plates are slidingly installed on the three-axis frame;

[0020] A first sorting frame and a second sorting frame are respectively installed on the two sliding plates;

[0021] A sorting head is vertically installed below the first sorting frame and the second sorting frame, and an axle sleeve is arranged in each of the first sorting frame and the second sorting frame, and the upper end of the sorting head is connected with the axle sleeve.

[0022] Further, as a preferred, a machine shell cover is fixedly sleeved on the sorting head, and a spectrometer probe is arranged inside and below the machine shell cover.

[0023] Further, as a preferred, a sealing ring is vertically fixed below the sorting head, a gas sleeve is coaxially arranged outside the sealing ring, a taper head is arranged between the gas sleeve and the sealing ring, and an adhesive layer is connected to the lower end of the taper head.

[0024] A sleeve pipe is coaxially fixed on the sorting head, the upper end of the sleeve pipe extends into the axle sleeve, a gas pressure pipe is vertically and rotatably connected in the axle sleeve, and the lower end of the gas pressure pipe is in communication with the sealing ring.

[0025] The lower end side wall of the air pressure pipe is provided with a side hole, the inner wall of the air sleeve is circumferentially provided with a plurality of air holes, the lower end of the air hole is inclined towards the adhesive layer, and the side hole is sealed and connected with each air hole during rotation of the air pressure pipe.

[0026] Further, as preferred, an internal motor is installed in the shaft sleeve, and the output end of the internal motor is connected and driven with the air pressure pipe through gear meshing;

[0027] The upper part of the first sorting frame and the second sorting frame is provided with an air injection device, the air injection device is sealed and connected with the air pressure pipe, and the air pressure pipe is provided with an eccentric block.

[0028] The adhesive layer is in an arc structure of concave or convex under the air pressure regulation.

[0029] Further, as preferred, an axial assembly gap is left between the sleeve and the shaft sleeve, and an internal spring is connected between the assembly gaps, a toothed ring is provided on the air pressure pipe, and the lower end surface of the toothed ring is in abutting contact with the sleeve.

[0030] Compared with the prior art, the beneficial effects of the present application are:

[0031] In the present application, the LED packaging surface defect intelligent detection device, the feeding table sends the LED after glue pouring and molding into the workbench through the transportation guide rail, the LED can be temporarily fixed in the material groove of the material disc by the taking material manipulator one by one, the flexible substrate used in the material groove can on the one hand power on the LED and light, and on the other hand realize the dynamic posture of the LED packaging surface in the flexible deformation, which is convenient for the multi-angle detection of the visual detection assembly;

[0032] In the present application, the first sorting frame and the second sorting frame used in the sorting unit can correspondingly sort the LED good products and defective products into the corresponding material boxes in the cooperative work, the sorting efficiency is high, the automatic test classification of the LED packaging is realized, a large amount of labor cost is saved, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0034] Figure 2 It is a top view of the material disc in the present application;

[0035] Figure 3 It is a structure schematic diagram of the visual detection assembly in the present application;

[0036] Figure 4 It is a structure schematic diagram of the flexible substrate in the present application;

[0037] Figure 5 It is a structure schematic diagram of the sorting unit in the present application;

[0038] Figure 6 The internal structure diagram of the shaft sleeve in the application;

[0039] Figure 7 The sectional view of the sorting head in the application;

[0040] In the figure: 1, workbench; 11, feeding table; 12, conveying guide rail; 13, material taking manipulator; 2, tray; 21, trough; 22, flexible substrate; 23, probe contact; 24, convex edge; 25, guide support rod; 26, fixing groove; 27, hydraulic cavity; 3, visual inspection assembly; 31, support column; 32, lighting device; 33, adjusting plate; 34, fixing plate; 35, CCD industrial camera; 4, sorting unit; 41, three-axis rack; 42, first sorting rack; 43, second sorting rack; 44, machine shell cover; 5, shaft sleeve; 51, air pressure pipe; 52, side hole; 53, air injection device; 54, eccentric block; 55, threaded ring; 6, sorting head; 61, sealing ring; 62, air sleeve; 63, cone head; 64, adhesive layer; 65, sleeve; 66, air hole. DETAILED DESCRIPTION

[0041] Please refer to Figures 1-7 In the embodiment of the application, an LED packaging surface defect intelligent detection device comprises:

[0042] The workbench 1 is provided with the feeding table 11 on one side, and the conveying guide rail 12 is horizontally connected between the feeding table 11 and the workbench 1;

[0043] The material taking manipulator 13 is arranged in the workbench 1 and is suspendedly installed above the conveying guide rail 12; wherein the LED can be temporarily placed in the LED carrier tray in the feeding table 11 after the die bonding and glue filling are completed, and the material taking manipulator 13 can sort and transport the LED in the LED carrier tray one by one, and an auxiliary camera can also be arranged on the material taking manipulator 13 to preliminarily detect the vision, so that the obviously unqualified LED is sorted out, thereby improving the subsequent detection efficiency;

[0044] The tray 2 is rotatably installed in the inside of the workbench 1, and a plurality of troughs 21 are uniformly arranged on the upper end face of the tray 2 for placing the LED;

[0045] The visual inspection assembly 3 is arranged in the workbench and located at the periphery of the tray 2;

[0046] The sorting unit 4 is arranged at the periphery of the tray 2 and located at the downstream station of the visual inspection assembly 3, and the workbench 1 is provided with a sorting box on the side far away from the feeding table 11, and the sorting unit 4 can sort the LED good products and defective products recognized by the visual inspection assembly 3 into different sorting boxes respectively.

[0047] In the embodiment, the visual detection assemblies 3 are arranged in three groups and sequentially perform appearance detection, scratch detection and optical performance detection on the LEDs. Specifically, the first visual station, the second visual station and the third visual station are sequentially arranged in the rotation direction of the tray 2. The first visual station can adopt a high-resolution color area array camera and is configured with a ring-shaped shadowless white light LED light source. The first visual station mainly detects whether the LED is successfully placed in the trough 21, identifies whether the positive and negative directions of the LED are correct (for tests requiring to distinguish the polarity), and performs basic appearance screening, such as detecting obvious damage, cracking and dirt. Of course, when the LED is powered on, it can also confirm whether the LED is successfully lit and screen out invalid LEDs.

[0048] The second visual station adopts an ultra-high-resolution black-and-white area array camera. The second visual station utilizes low-angle light to highlight the micro scratches on the surface of the packaging glue and detects bubbles and impurities inside or on the surface of the LED.

[0049] The third visual station can be configured with a color brightness meter so as to measure the color temperature, color coordinates, brightness and other photoelectric parameters of the LED when the LED is lit.

[0050] The three groups of visual detection assemblies 3 sequentially perform detection work in cooperation with each other, improve the detection accuracy, and the camera and light source of each visual station are used for detecting specific defects. The detection ability is stronger, the missed detection rate and the misjudgment rate are lower, and the intelligent detection of the LED packaging is realized.

[0051] As a preferred embodiment, the visual detection assembly 3 comprises:

[0052] A support column 31, the upper end face of which is vertically fixed with an illumination device 32 through an L-shaped bracket. The illumination device 32 is an illumination system, and different visual detection assemblies 3 are configured with corresponding illumination systems.

[0053] An adjusting plate 33 is horizontally installed on the support column 31. A sliding groove is formed in the side wall of the adjusting plate 33, and a fixed plate 34 is slidably installed outside the sliding groove.

[0054] A CCD industrial camera 35 is vertically installed on the fixed plate 34.

[0055] In the embodiment, the flexible substrate 22 is horizontally arranged in the trough 21, two probe contacts 23 are symmetrically arranged on the flexible substrate 22, and the probe contacts 23 are in contact with the LED pins. When the LED is placed in the trough 21, the pins can be automatically and reliably connected with the contacts, and the LED is automatically powered on and lit. Not only can it detect whether the LED can normally emit light (exclude dead light and bad light), but also can observe whether the light brightness, color and uniformity have defects under the visual detection component 3 in the lit state, so as to realize the integrated automatic detection of optical performance and appearance defects. The inner wall of the trough 21 is symmetrically distributed with two convex edges 24, and the two convex edges 24 are respectively pressed and contacted on the upper end of the LED pin. The traditional lighting test may need additional tooling or be completed by manual holding, which is low in efficiency and easy to have poor contact. In the present application, the two convex edges 24 can limit and press the LED pin to form a temporary pressing effect after the LED is placed in the trough 21 by the taking mechanical hand 13, so as to ensure the contact pressure of the LED pin and the probe contact 23, and avoid poor contact in the detection process.

[0056] A plurality of guide cavities are circumferentially distributed below the flexible substrate 22 in the trough 21, a guide support rod 25 is slidably installed in each guide cavity, and the upper end of the guide support rod 25 is in contact with the flexible substrate 22. The flexible substrate 22 used in the present device can be bent and deformed, so that the LED on it can change the angle and orientation with the deformation of the flexible substrate 22. When the guide support rod 25 drives the flexible substrate 22 to deform slightly, the LED package surface can be tilted and rotated, so that the side surface, colloid curved surface and other areas which are difficult to observe are exposed, and full imaging without detection dead angle is realized, which greatly improves the defect detection rate. The flexible substrate 22 itself has certain buffering and adaptive capacity. When the LED is placed on it, the flexible contact can effectively reduce the physical damage such as scratches and indentation on the LED pin and package surface compared with the hard metal clamp.

[0057] In the embodiment, a fixing groove 26 is formed in the middle of the trough 21, and the guide support rod 25 is located in the fixing groove 26. The fixing groove 26 is mainly used as a retreat groove. When the LED is sorted into the trough 21, the taking mechanical hand 13 presses and places the LED into the trough 21. At this time, the flexible substrate 22 is bent and deformed downward, and the gap between the flexible substrate 22 and the convex edge 24 is enlarged, so as to facilitate the clamping of the pin of the LED below the convex edge 24. After the detection is completed, the action of picking up the LED is consistent with the above.

[0058] The lower part of the guide cavity is provided with a hydraulic cavity 27 filled with hydraulic oil, and the outer part of the hydraulic cavity is provided with a hydraulic pipe (not shown in the figure). In this way, the hydraulic oil in the hydraulic cavity 27 flows into the guide cavity in high pressure, thereby pushing the guide support rod 25 upward to be ejected, and at this time, the flexible base plate 22 is deformed due to the pressing effect, wherein the guide cavity in each trough 21 is preferably provided with three, thereby reducing the complexity of the control system.

[0059] In this embodiment, the sorting unit 4 comprises:

[0060] A three-axis frame 41 is fixed in the workbench 1, and two sliding plates are slidingly installed on the three-axis frame 41.

[0061] A first sorting frame 42 and a second sorting frame 43 are respectively installed on the two sliding plates.

[0062] A sorting head 6 is vertically installed below the first sorting frame 42 and the second sorting frame 43, and the first sorting frame 42 and the second sorting frame 43 are both provided with a shaft sleeve 5, the upper end of the sorting head 6 is connected with the shaft sleeve 5, and the sorting head 6 can contact the surface of the LED, thereby realizing the picking of the LED.

[0063] As a preferred embodiment, a shell cover 44 is sleeved and fixed on the sorting head 6, and a spectrometer probe (not shown in the figure) is arranged inside and below the shell cover 44. The spectrometer probe can detect the overall brightness change of the LED from lighting to extinguishing during the picking of the LED, dynamically capture the LED brightness decay curve, and indirectly evaluate the response characteristics of the LED.

[0064] In this embodiment, a sealing ring 61 is vertically fixed below the sorting head 6, a gas sleeve 62 is coaxially arranged outside the sealing ring 61, a taper head 63 is arranged between the gas sleeve 62 and the sealing ring 61, the lower end of the taper head 63 is connected with a sticky layer 64, and the surface of the sticky layer 64 has high viscosity, which can contact and adhere to the surface of the LED, thereby taking out the LED from the trough 21.

[0065] A sleeve pipe 65 is coaxially fixed on the sorting head 6, the upper end of the sleeve pipe 65 extends into the shaft sleeve 5, a gas pressure pipe 51 is vertically and rotatably connected in the shaft sleeve 5, and the lower end of the gas pressure pipe 51 is connected with the sealing ring 61. In this way, the airflow in the gas pressure pipe 51 can flow downward into the sealing ring 61.

[0066] The lower end side wall of the air pressure pipe 51 is provided with a side hole 52, the inner wall of the air sleeve 62 is circumferentially provided with a plurality of air holes 66, the lower end of the air hole 66 is inclined towards the adhesive layer 64, and the side hole 52 is sealed and connected with each air hole 66 during the rotation of the air pressure pipe 51. Thus, the airflow in the air pressure pipe 51 can also enter the corresponding air hole 66 through the side hole 52, so as to blow towards the LED below the adhesive layer 64 through the inclined end below the air hole 66, thereby realizing the air blowing separation of the LED.

[0067] In this embodiment, the shaft sleeve 5 is provided with an internal motor, and the output end of the internal motor is connected and driven with the air pressure pipe 51 through gear meshing.

[0068] The upper part of the first sorting frame 42 and the second sorting frame 43 are provided with air injection devices 53, the air injection devices 53 are sealed and connected with the air pressure pipe 51, and the air pressure pipe 51 is provided with an eccentric block 54. Thus, when the internal motor drives the air pressure pipe 51 to rotate at a constant speed, the eccentric block 54 can generate vibration through centrifugal force, thereby realizing high-frequency and small-amplitude mechanical vibration of the end of the sorting head 6, directly acting on the adhesive layer 64, effectively destroying the adhesion between the adhesive and the LED chip, and making the LED loose and fall off quickly, thereby realizing discharging.

[0069] The adhesive layer 64 has an arc-shaped structure under the action of air pressure, and the inside of the air pressure pipe 51 is in a negative pressure state before use. The side hole 52 is not connected with any air hole 66 at this time, and the adhesive layer 64 has an arc-shaped structure concave to the inside, which is matched with the surface of the LED, so as to be fully adhered to the surface of the LED. When discharging, the air pressure pipe 51 sends airflow at high pressure, and the adhesive layer 64 is deformed outwardly to form an arc shape, which is gradually separated from the surface of the LED. In order to further accelerate the separation efficiency, the internal motor drives the air pressure pipe 51 to rotate quickly, which generates centrifugal force through the eccentric block 54 to realize high-frequency and small-amplitude mechanical vibration of the end of the sorting head 6, and the side hole 52 is connected with different positions of the air hole 66 one by one, so that the air hole 66 blows alternately to blow off the material from multiple angles.

[0070] In this embodiment, the sleeve 65 and the shaft sleeve 5 have an axial assembly gap, and an internal spring is connected between the assembly gaps, which can form bottom support for the sleeve 65 under the action of elastic force. The air pressure pipe 51 is provided with a toothed ring 55, the lower end surface of the toothed ring 55 abuts against the sleeve 65, and the surface of the sleeve 65 can be provided with a cutting groove. Thus, when the toothed ring 55 rotates with the air pressure pipe 51, the sleeve 65 can realize axial vibration through intermittent contact between the tooth peak and the cutting groove, thereby realizing vibration discharging.

[0071] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An LED package surface defect intelligent detection device, characterized in that, It includes: Workbench (1), one side is provided with a feeding table (11), the feeding table (11) and the workbench (1) are connected with the transport guide rail (12) horizontally; Material taking manipulator (13) is arranged in the workbench (1) and is suspendedly installed above the transport guide rail (12); The tray (2) is rotatably installed in the inside of the workbench (1), and a plurality of troughs (21) are uniformly arranged on the upper end face of the tray (2); Visual inspection assembly (3) is arranged in the workbench and located at the periphery of the tray (2); The sorting unit (4) is arranged at the periphery of the tray (2) and located at the downstream station of the visual inspection assembly (3), and the workbench (1) is provided with a distribution box away from the feeding table (11) on one side. The sorting unit (4) comprises: Three-axis rack (41) is fixed in the workbench (1), and two sliding plates are slidably installed on the three-axis rack (41); First sorting frame (42) and second sorting frame (43) are respectively installed on the two sliding plates; The sorting head (6) is vertically installed below the first sorting frame (42) and the second sorting frame (43), the shaft sleeve (5) is arranged in the first sorting frame (42) and the second sorting frame (43), and the upper end of the sorting head (6) is connected with the shaft sleeve (5); The sealing ring (61) is vertically fixed below the sorting head (6), the gas sleeve (62) is coaxially arranged outside the sealing ring (61), the taper head (63) is arranged between the gas sleeve (62) and the sealing ring (61), and the lower end of the taper head (63) is connected with the adhesive layer (64); The sleeve pipe (65) is coaxially fixed on the sorting head (6), the upper end of the sleeve pipe (65) extends into the shaft sleeve (5), the gas pressure pipe (51) is vertically rotatably connected in the shaft sleeve (5), and the lower end of the gas pressure pipe (51) is communicated with the sealing ring (61); The side hole (52) is arranged on the side wall of the lower end of the gas pressure pipe (51), a plurality of air holes (66) are circumferentially arranged on the inner wall of the gas sleeve (62), the lower end of the air hole (66) is inclined to the adhesive layer (64), and the side hole (52) is sealed and connected with each air hole (66) during rotation of the gas pressure pipe (51). 2.The LED package surface defect intelligent detection device according to claim 1, characterized in that: The visual inspection assembly (3) is arranged in three groups and sequentially detects the appearance, scratch and optical performance of the LED. 3.The LED package surface defect intelligent detection device according to claim 1, characterized in that, The visual inspection assembly (3) comprises: The upper end face of the support column (31) is vertically fixed with the illuminating device (32) through the L-shaped frame; The adjusting plate (33) is horizontally installed on the support column (31), and the side wall of the adjusting plate (33) is provided with a sliding groove, and the fixed plate (34) is slidably installed outside the sliding groove; The CCD industrial camera (35) is vertically installed on the fixed plate (34). 4.The LED package surface defect intelligent detection device of claim 1, wherein: The flexible substrate (22) is horizontally arranged in the trough (21), two probe contacts (23) are symmetrically arranged on the flexible substrate (22), the probe contacts (23) are in contact with the LED pins, two convex edges (24) are symmetrically distributed on the inner wall of the trough (21), and the two convex edges (24) are pressed on the upper ends of the LED pins, respectively. A plurality of guide cavities are circumferentially distributed below the flexible substrate (22) in the trough (21), a guide support rod (25) is slidingly installed in each guide cavity, and the upper end of the guide support rod (25) is in contact with the flexible substrate (22).

5. The LED package surface defect intelligent detection device according to claim 4, characterized in that: A fixing groove (26) is formed in the middle of the trough (21), and the guide support rod (25) is located in the fixing groove (26). A hydraulic cavity (27) is arranged below each guide cavity, the hydraulic cavity (27) is filled with hydraulic oil, and a hydraulic pipe is arranged outside the hydraulic cavity. 6.The LED package surface defect intelligent detection device according to claim 1, characterized in that: A machine shell cover (44) is sleeved and fixed on the sorting head (6), and a spectrometer probe is arranged below the inside of the machine shell cover (44). 7.The LED package surface defect intelligent detection device according to claim 1, characterized in that: An inner motor is installed in the shaft sleeve (5), and the output end of the inner motor is connected and driven with the air pressure pipe (51) through gear meshing. An air injection device (53) is arranged above the first sorting frame (42) and the second sorting frame (43), the air injection device (53) is sealed and communicated with the air pressure pipe (51), an eccentric block (54) is sleeved on the air pressure pipe (51). The adhesive layer (64) is in an arc structure of concave or convex under the action of air pressure adjustment. 8.The LED package surface defect intelligent detection device according to claim 1, characterized in that: An axial assembly gap is left between the sleeve (65) and the shaft sleeve (5), an inner spring is connected between the assembly gaps, a toothed ring (55) is sleeved on the air pressure pipe (51), and the lower end surface of the toothed ring (55) is in abutting contact with the sleeve (65).

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