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A technology of powder spraying and powder spraying machine, applied in the direction of semiconductor devices, electrical components, circuits, etc., can solve the problems of unevenness, high operation efficiency, and large amount of powder spraying, to ensure consistency, improve accuracy, and satisfy color temperature. Effect
Active Publication Date: 2019-05-03
HONGLI ZHIHUI GRP CO LTD
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This powder spraying method can spray powder on multiple LED semi-finished products at one time, and the operation efficiency is high. However, due to the large-area powder spraying process, it cannot ensure that the powder falling on the surface of each LED semi-finished product is uniform. It is easy to cause the unevenness of more or less powder spraying in a certain area, resulting in poor color temperature consistency of the final product
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Embodiment 1
[0031] A kind of LED dusting method, comprises the following steps:
[0032] (1) Parameter setting of powder spraying machine: click to open the setting page, and ensure that the following important parameters of powder spraying are set correctly:
[0033] Heating (Heater): on (open);
[0034] Movement interval (ptich-monement): X: 5mm; Y: 5mm;
[0038] T4: 13.5ms (this value can be fine-tuned during the powder replenishment stage);
[0039] Dust spray area range (Size) setting (can be adjusted according to the actual powder spray situation): spray one piece: X 75mm; Y150mm; spray two pieces: X 145mm; Y 150mm; The area of the two pieces is 145*150mm;
[0040] (2) Mix powder-spraying glue solution: mix glue, fluorescent powder and diluent in a ratio of (1:1:3), then pour into a centrifugal...
Embodiment 2
[0061] Such as figure 2 As shown, the difference from Example 1 is that after the amount of powder spraying is determined, the LED product is sprayed with powder, and the color temperature value of the LED product is tested every time the powder is sprayed. If the color temperature is within the preset value range, it means that the powder sprayed this time The operation is over; if the color temperature value is less than the preset value, the substrate will be cleaned; if the color temperature value is greater than the preset value, the final supplementary powder spraying will be carried out according to the current color temperature of the LED product to calculate the amount of powder required to achieve the target color temperature.
[0062] At the same time, in order to prevent excessive supplementary powder spraying, if the color temperature value is greater than the preset value, the final supplementary powder spraying steps include: if the color temperature value is gr...
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Abstract
The invention provides an LED powder spraying method, which comprises the following steps of loading a mixed powder spraying glue solution into a powder spraying machine; spraying powder on paper and ensuring uniform powder spraying; spraying the powder on a support plate, weighing the support plate to confirm the power spraying amount on the support plate; ensuring that the primary powder spraying amount is within a preset range through debugging the powder spraying machine; after the powder spraying amount is determined, carrying out quantitative powder spraying on LED products according to the preset powder spraying amount for n times, lightening the LED products after quantitative powder spraying and testing color temperature values of the LED products; if the color temperatures reach a preset value, indicating that the powder spraying operation is completed; if the color temperatures are smaller than the preset value, cleaning a substrate; and if the color temperatures are greater than the preset value, calculating the powder spraying amount required for reaching a target color temperature according to the current color temperatures of the LED products and carrying out last supplementary powder spraying. The color temperature consistency of each LED product after powder spraying is relatively good and the yield is high.
Description
technical field [0001] The invention relates to the field of LEDs, in particular to an LED powder spraying method. Background technique [0002] LED products need to be covered with a layer of fluorescent glue on the surface of the chip after bonding wires. The light emitted by the chip emits light with different color temperatures by exciting different ratios of fluorescent glue. The fluorescent adhesive layer of existing LED products can be formed by molding, film sticking, powder spraying and other methods. For LED semi-finished products that act in batches, powder spraying is generally used. The operation process of the existing powder spraying method is as follows: convert the required color temperature into powder spraying amount; add a certain amount of powder glue solution to the powder spraying machine; powder spraying continues to spray powder on the sheet material according to the preset trajectory until the powder spraying The pre-set phosphor glue in the machi...
Claims
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