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Applying method for accurately controlling shape and thickness of coating

A technology of coating thickness and control algorithm, applied in the direction of coating, adaptive control, general control system, etc., can solve the problems affecting the performance of power LEDs, yellowish or blueish outgoing light, uneven white spot, etc. Improve color consistency, high light extraction efficiency, and improve optical performance

Inactive Publication Date: 2019-11-29
JIANGSU UNIV
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Problems solved by technology

At present, the phosphor coating process mainly adopts the spraying method and the dispensing method, but these two manufacturing processes are difficult to guarantee the precise shape and thickness of the coating, which will cause the outgoing light to be partially yellowish or bluish, and the white spot formed is uneven. , thus affecting the performance of power LEDs

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  • Applying method for accurately controlling shape and thickness of coating
  • Applying method for accurately controlling shape and thickness of coating
  • Applying method for accurately controlling shape and thickness of coating

Examples

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Embodiment Construction

[0051] A coating method that precisely controls the shape and thickness of the coating, such as Figure 1 As shown, it includes the following steps: (1) Control the patterned steel mesh engraved by the laser to move to the top of the substrate and coincide with the center of the substrate 11 (2) After step 1 is completed, control the spray gun head to move to the LED to be coated On the substrate, coincide with the center of the patterned steel mesh 12(3) After step 2 is completed, set the spraying parameters (spraying distance, colloid concentration, spraying speed, etc.) through the pulse operation screen 13(4) After step 3 is completed, complete the LED The spraying work of the substrate coating, and obtain its thickness shape 14 (5) through the infrared thermal imager + PC to complete the shape thickness error between the current coating and the set coating 15 (6) compare the error with the set error, If it is less than the set error, the spraying will also end. If it is ...

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Abstract

The invention discloses an applying method for accurately controlling the shape and thickness of a coating. According to the applying method, shape information of the coating and the temperatures of the upper and lower surfaces of the coating are measured through an infrared thermal imaging method, namely, the thickness of the coating is obtained through temperature difference and is fed back to acoating applying self-adaptive PID control algorithm, the process of conducting applying on an LED substrate by a pulse nozzle is accurately controlled, and high-precision control of the required shape and thickness of the coating is achieved. According to the applying method, pulse applying and graphic steel net mask applying are adopted to form approximate shape and thickness; the infrared thermal imaging method is used for measuring the shape and thickness of the coating; information obtained is transmitted to a database receiver for comparison; data processing errors are fed back to the self-adaptive PID control algorithm to continuously optimize and correct control parameters in the applying process; and accurate control of the applying shape and thickness of the coating is realized.

Description

technical field [0001] The invention relates to a coating method, in particular to a coating method for precisely controlling the shape and thickness of a coating. Background technique [0002] Coatings are used in various fields such as aerospace, gas chemical industry, microelectronics, and automobile industry. They have the advantages of anti-corrosion, heat insulation, and wear resistance, and have a huge effect on improving the life of products. Coating methods at home and abroad are also constantly improving and upgrading, so the coating method has certain research value. [0003] In the process of LED packaging to achieve white light, the phosphor powder converts the color and energy of the blue light emitted by the chip to form white light. Therefore, the coating process of phosphor powder determines the quality of white light LED to a certain extent. At present, the phosphor coating process mainly adopts the spraying method and the dispensing method, but these two ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/02B05D1/32B05B12/08G01B11/06G05B13/02
CPCB05B12/084B05D1/02B05D1/32G01B11/0616G05B13/024
Inventor 周骋杨平
Owner JIANGSU UNIV