LED packaging process and centrifugal precipitation device

Abstract

The present invention relates to the field of LED processing, and in particular to a packaging process and centrifugal precipitation device for LED. A packaging process for LED comprises the following steps: a glue making step: mixing and evenly mixing packaging glue and fluorescent powder to form fluorescent glue; a centrifugal precipitation step: dotting the prepared fluorescent glue onto the blue LED chip to be packaged, and then loading it into the centrifugal barrel of the centrifugal precipitation device in batches, the axis of the centrifugal barrel is in the horizontal direction, the centrifugal barrel is started, and the centrifugal barrel is rotated at a speed of 2600-2800 rpm for 180-300 seconds, and the rotation stops and then stops for 1 hour; a baking step: putting the LED after centrifugal precipitation into an oven, first baking at 60-80°C for 50-70 minutes, then baking at 140-160°C for 230-250 minutes, and naturally cooling to room temperature after baking. The present invention can effectively improve the concentration of color areas, and has obvious effects on removing bubbles and improving light spots.

Description

Technical Field

[0001] The invention relates to the field of LED processing, and in particular to an LED packaging process and a centrifugal precipitation device. Background Art

[0002] In the LED packaging process, many packaging companies directly bake after dispensing glue, which can easily lead to uneven phosphor powder, affect the quality of LED, and easily lead to many dead corners of phosphor glue on the chip bracket. In order to improve this undesirable phenomenon, the traditional general packaging process is currently used by many packaging factories, but its production process has obvious defects, the color zone yield is often low, which directly affects the shipment rate, increases inventory costs, and cannot meet the increasingly fierce market competition. At the same time, the natural precipitation time is long, and even no precipitation or uneven precipitation, resulting in scattered light in the luminous color area, non-concentration, and non-uniformity. In this case, many defective products are produced, increasing the production cost of LED. Summary of the invention

[0003] In view of the above, the present invention is to solve the deficiencies of the prior art and provide a centrifugal sedimentation device that can improve the uniformity of phosphor distribution, reduce the color zone drift problem, and improve the light spot.

[0004] In order to achieve the above object, the technical solution adopted by the present invention to solve the technical problem is:

[0005] A packaging process for LEDs comprises the following steps:

[0006] Glue preparation steps: mixing the encapsulation glue and the phosphor powder evenly to form fluorescent glue;

[0007] Centrifugal precipitation step: dot the prepared fluorescent glue onto the LED material board to be packaged, and then load the LED material board into the centrifugal barrel of the centrifugal precipitation device in batches, with the axis of the centrifugal barrel in the horizontal direction, start the centrifugal barrel, and rotate it at a speed of 2600-2800 rpm for 180-300 seconds. The fluorescent powder in the fluorescent glue is precipitated onto the bottom surface of the packaging bracket and the surface of the LED chip by the action of centrifugal force to form a high-concentration fluorescent powder layer. After the rotation stops, it is left to stand for 1 hour;

[0008] In the baking step, the LED after centrifugal precipitation is placed in a baking device for baking, and then naturally cooled to room temperature after baking.

[0009] Preferably, in the centrifugal sedimentation step, the centrifugal barrel rotates at a speed of 2700 rpm for 240 seconds and then stands still for 1 hour after the rotation stops.

[0010] Another inventive object of the present invention is to provide a centrifugal sedimentation device specially designed for implementing the centrifugal sedimentation step, including a centrifugal barrel and a cabinet, a rotating shaft is fixedly provided on the inner side surface of the cabinet, a centrifugal barrel is provided on the rotating shaft, a plurality of axial ridges are provided on the inner wall of the centrifugal barrel, at least one side of the ridge has an inwardly recessed fixing groove, an LED material plate is provided between the fixing grooves arranged opposite to each other between adjacent ridges, the clamping portion on the LED material plate is clamped in the fixing groove, and a locking assembly is provided on the edge of the ridge.

[0011] Preferably, the ridges are evenly spaced from the inner wall of the centrifugal drum, and both sides of the ridges have inwardly recessed fixing grooves.

[0012] Preferably, 10-30 ridges are provided on the inner wall of the centrifugal drum.

[0013] Preferably, a control panel is provided on the cabinet, on which a start button, a stop button, a power switch, an interface and a display screen are provided.

[0014] Preferably, the locking assembly comprises a locking plate, a guide rod and a fixing block, the fixing block is arranged on the convex ridge, the guide rod is fixedly connected to the locking plate, and a spring is arranged on the guide rod.

[0015] Preferably, a storage box is further provided on the centrifugal drum, an ultrasonic generator is arranged in the storage box, and a box cover is fixedly provided on the storage box.

[0016] Preferably, a vibration motor is further provided in the storage box.

[0017] It can be seen from the above technical solutions that the present invention uses the centrifugal precipitation process of the LED packaging process to evenly cover the fluorescent powder on the chip surface, effectively improving the color zone concentration, and no longer being affected by the length of time after dispensing and before baking. The drift of the center point of the color zone is affected; it has obvious effects on removing bubbles and improving the light spot; it effectively improves the color zone yield of LED products, increases product shipment rate, reduces inventory pressure, significantly improves the light spot, and makes the luminous color more uniform; through high-speed centrifugation to generate a huge centrifugal force, the fluorescent powder suspended on the shallow surface or surface of the glue is thrown and precipitated, and gathered in the cup, so that the LED luminous color area is concentrated, and at the same time, the differences between the fluorescent powders in the colloid between each product are reduced. The parameter performance parameters are excellent, and the color consistency and shipment yield of the product are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a centrifugal sedimentation device specially designed for implementing the centrifugal sedimentation step of the present invention.

[0019] Figure 2 yes Figure 1 A is an enlarged schematic diagram of the middle figure.

[0020] Figure 3 It is a schematic diagram of a locking assembly on the centrifugal sedimentation device of the present invention.

[0021] Explanation of the reference numerals: 1-cabinet, 11-baffle, 2-control panel, 3-centrifugal barrel, 31-convex ridge, 32-storage box, 33-LED material board, 34-locking assembly, 341-locking plate, 342-guide rod, 343-fixing block. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with specific embodiments:

[0023] A packaging process for LEDs comprises the following steps:

[0024] Glue preparation steps: mixing the encapsulation glue and the phosphor powder evenly to form fluorescent glue;

[0025] Centrifugal precipitation step: dot the prepared fluorescent glue onto the LED material board to be packaged, and then load the LED material board into the centrifugal barrel of the centrifugal precipitation device in batches, with the axis of the centrifugal barrel in the horizontal direction, start the centrifugal barrel, and rotate it at a speed of 2600-2800 rpm for 180-300 seconds. The fluorescent powder in the fluorescent glue is precipitated onto the bottom surface of the packaging bracket and the surface of the LED chip by the action of centrifugal force to form a high-concentration fluorescent powder layer. After the rotation stops, it is left to stand for 1 hour;

[0026] In the baking step, the LED after centrifugal precipitation is placed in a baking device for baking, and then naturally cooled to room temperature after baking.

[0027] A more preferred solution of this embodiment is that in the centrifugal sedimentation step, the centrifugal barrel rotates at a speed of 2700 rpm for 240 seconds, and then stands still for 1 hour after the rotation stops.

[0028] The centrifugal precipitation step generally only requires the phosphor to be precipitated slightly below halfway, without complete precipitation, thus reducing phosphor waste. At the same time, excessive precipitation of phosphor will have the adverse effect of blocking light. Furthermore, when the completely precipitated phosphor is left to stand, it will reversely precipitate due to the reaction between the particles.

[0029] After many experiments and actual production, we have come to the conclusion that: generally, the rotation speed is 2700, the operation time is 240 seconds, the time is unified, and changing the rotation speed to determine the degree of precipitation can better ensure the precipitation effect and production efficiency. This method can make the phosphor evenly distributed, thereby improving the color uniformity and color consistency, and it is also significantly effective in improving the light spot effect.

[0030] See also Figure 1 , Figure 2 , Figure 3A centrifugal sedimentation device specially designed for implementing the centrifugal sedimentation step includes a centrifugal barrel 2 and a cabinet 1. A rotating shaft is fixedly provided on the inner side surface of the cabinet 1. A baffle 11 is provided on the cabinet 1. The centrifugal barrel 2 is provided on the rotating shaft. A plurality of axial convex ridges 31 are provided on the inner wall of the centrifugal barrel 2. At least one side of the convex ridge 31 has an inwardly recessed fixing groove. An LED material plate 33 is provided between the fixing grooves oppositely arranged between adjacent convex ridges 31. The clamping portion on the LED material plate 33 is clamped in the fixing groove. A locking component 34 is provided on the edge of the convex ridge 31.

[0031] The present invention generates huge centrifugal force through high-speed centrifugation, which precipitates the fluorescent powder suspended on the shallow surface or surface of the glue and gathers it in the cup, so that the LED luminous color area is concentrated, and at the same time reduces the difference between the fluorescent powders in the colloid of each product. The parameter performance parameters are excellent, and the color consistency and shipment yield of the product are greatly improved.

[0032] The locking assembly 34 can ensure that the high-speed rotating centrifugal tube will not cause the fluorescent glue to adhere to the outer edge of the fixed groove due to shaking, thereby avoiding contamination of the drum of the centrifugal sedimentation machine due to glue sticking.

[0033] The ridges 31 on the inner wall of the centrifugal drum 2 are evenly spaced, and both sides of the ridges 31 have inwardly recessed fixing grooves.

[0034] The inner wall of the centrifugal drum 2 is provided with 10-30 ridges 31 .

[0035] The cabinet 1 is provided with a control panel 2 which is provided with a start button, a stop button, a power switch, an interface and a display screen; the control panel 2 is used to control the operation of the centrifugal barrel 2, and the control panel 2 is connected to the controller.

[0036] See also Figure 3 The locking assembly 34 includes a locking plate 341, a guide rod 342 and a fixing block 343. The fixing block 343 is arranged on the convex ridge 31. The guide rod 342 is fixedly connected to the locking plate 341. A spring is arranged on the guide rod 342. The locking plate 341 is pushed to both sides, and the LED material board 33 is placed in the fixing groove between the two convex ridges 31. The locking plate 341 returns to its original position driven by the spring, and the LED material board 33 is locked. The use of this assembly not only has a good locking effect and strong stability, but also has a compact structure and is easy to operate.

[0037] The centrifugal drum is also provided with a storage box 32, in which an ultrasonic generator is arranged, and a box cover is fixedly provided on the storage box 32; the ultrasonic generator is used to evenly disperse the phosphor before precipitation to reduce agglomeration.

[0038] The storage box 32 is also provided with a vibration motor; after the product is doped with fluorescent glue, the product doped with fluorescent glue is placed in a precipitation device for precipitation treatment. The main precipitation technology is to use a centrifugal container and adopt the principle of high-speed centrifugation. Vibration can further disperse the distribution of the fluorescent powder and obtain a higher precipitation efficiency.

[0039] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A LED packaging process, characterized in that: The steps include: Glue preparation steps: mixing the encapsulation glue and the phosphor powder evenly to form fluorescent glue; Centrifugal precipitation step: dot the prepared fluorescent glue onto the LED material board to be packaged, and then load the LED material board into the centrifugal barrel of the centrifugal precipitation device in batches, with the axis of the centrifugal barrel in the horizontal direction, start the centrifugal barrel, and rotate it at a speed of 2700 rpm for 240 seconds. Through the action of centrifugal force, the fluorescent powder in the fluorescent glue is precipitated onto the bottom surface of the packaging bracket and the surface of the LED chip to form a layer of high-concentration fluorescent powder layer. After the rotation stops, it is left to stand for 1 hour; Baking step: putting the centrifugally precipitated LED into a baking device for baking, and then naturally cooling it to room temperature after baking; In the centrifugal precipitation step, the rotation is stopped and the mixture is left to stand for 1 hour; A specially designed centrifugal sedimentation device is used to implement the centrifugal sedimentation step, and the centrifugal sedimentation device includes a centrifugal barrel and a cabinet. A rotating shaft is fixed on the inner side of the cabinet, and a centrifugal barrel is arranged on the rotating shaft. 10-30 convex ridges are arranged on the inner wall of the centrifugal barrel. Both sides of the convex ridges have inwardly concave fixing grooves. An LED material plate is arranged between the fixing grooves arranged opposite to each other between adjacent convex ridges. The clamping part on the LED material plate is clamped in the fixing groove, and a locking assembly is arranged on the edge of the convex ridge. The ridges on the inner wall of the centrifugal drum are arranged at even intervals; The cabinet is provided with a control panel, and the control panel is provided with a start button, a stop button, a power switch, an interface and a display screen; The locking assembly includes a locking plate, a guide rod and a fixing block, wherein the fixing block is arranged on the convex ridge, the guide rod is fixedly connected to the locking plate, and a spring is arranged on the guide rod; the LED material board can be placed in the fixing groove between the two convex ridges by pushing the locking plate to both sides, and the locking plate returns to the original position driven by the spring to lock the LED material board; The centrifugal drum is also provided with a storage box, an ultrasonic generator is arranged in the storage box, and a box cover is fixedly provided on the storage box; A vibration motor is also arranged in the storage box.

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