First of all, choose the right size, luminance, color, voltage, current LED bead packaging chip. The following are the steps:
1. Crystallization. The whole film of LED wafer provided by the manufacturer is evenly expanded by expander, so that the LED grains which are closely arranged on the surface of the film are pulled apart, which is convenient for spinning.
2. Gum. Place the expanded crystal ring on the back glue machine with scraped silver paste layer and back silver paste. It is suitable for bulk LED chips. A proper amount of silver paste is dotted on PCB printed circuit board by dispensing machine.
3. Fixing crystal. Put the expanded ring with silver paste into the spinning frame. The operator will use the spinning pen to spin the LED wafer on the PCB printed circuit board under the microscope.
4. Crystallization. Put the PCB printed circuit boards with prickly crystals in the thermal cycle oven for a period of time, and then take them out after the silver paste solidification (not permanent, otherwise the coating of the LED chip will be yellowed, that is, oxidation, which will cause difficulties for Bonding). If there is LED chip bonding, the above steps are needed; if only IC chip bonding, the above steps are canceled.
5. Welding wire. Aluminum wire welding machine is used to bridge the wafer and the corresponding pad aluminum wire on PCB board, that is, internal lead welding of COB.
6. Preliminary test. Using special testing tools (COB for different purposes has different equipment, simple is high precision regulated power supply) to detect COB board, and to repair unqualified boards.
7. Dispensing. A dispenser is used to place the dispensed AB glue on the bonded LED grains, while IC is encapsulated with black glue, and then the appearance is encapsulated according to the customer's requirements.
8. Curing. PCB printed circuit boards or lamp holders sealed with glue are placed in a heat cycle oven at constant temperature and can be set different drying time according to requirements.
9. Total measurement. The encapsulated PCB printed circuit boards or lamp holders are tested with special testing tools to distinguish the good from the bad.
10. Spectrum. Light with different brightness can be divided into different brightness according to the requirements and packaged separately.
11. Warehousing. Then go out in batches to create a comfortable LED bead packaging energy-saving life for everyone.
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