The first is to choose, choose the right size, illuminance, color, voltage, current LED lamp bead package chip, the following is a point description:
1. Expanding the crystal, using the dilating machine to uniformly expand the entire LED chip film provided by the manufacturer, so that the LED crystal grains closely attached to the surface of the film are pulled apart to facilitate the puncturing.
2, adhesive, the crystal expansion of the crystal expansion ring placed on the surface of the adhesive has been scraped silver paste, silver paste on the back. Point silver paste. Suitable for bulk LED chips. Use a dispenser to spot the right amount of silver paste on the PCB printed circuit board.
3. Solid crystal, the crystal expansion ring of the prepared silver paste is placed in the thorn crystal frame, and the operator punches the LED chip on the PCB printed circuit board with a lancet under the microscope.
4, crystallizing, the punctured PCB printed circuit board is placed in a thermal cycle oven for a period of time, after the silver paste is solidified and taken out (not permanently set, otherwise the LED chip coating will be baked yellow, that is, oxidation, to the state Difficult to make). If there is LED chip bonding, the above steps are required; if only the IC chip is bonded, the above steps are cancelled.
5, the welding wire, the aluminum wire bonding machine is used to bridge the wafer with the corresponding pad aluminum wire on the PCB board, that is, the inner lead of the COB is welded.
6, the initial test, the use of special testing tools (according to different uses of COB have different equipment, simple is high-precision regulated power supply) to detect COB board, the unqualified board is reworked.
7, dispensing, using a dispenser to place a good amount of AB glue to the bonding LED die, the IC is encapsulated with black plastic, and then according to customer requirements for the appearance of packaging.
8. Curing, put the sealed PCB printed circuit board or lamp holder into the heat cycle oven and let it stand at a constant temperature. Different drying time can be set according to requirements.
9, the total test, the packaged PCB printed circuit board or lamp holder with a dedicated testing tool for electrical performance testing, distinguish between good and bad.
10, splitting light, use the splitter to separate the brightness of the lamps of different brightness according to the requirements, and package them separately.
11, into the warehouse, and then go out in batches to create a comfortable LED lamp bead package for everyone to save energy.
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