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LED packaging lens appearance control method

A technology of LED packaging and control method, applied in semiconductor devices, electrical components, circuits, etc., can solve the problems of long manufacturing cycle, difficult mold processing, easy wear, etc., to improve surface finish, shorten processing cycle, and improve optical performance. Effect

Active Publication Date: 2015-11-18
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mold processing is difficult, the cost is high, the manufacturing cycle is long, and it is easy to wear and tear. The mold will be scrapped after repeated use, and the lens is easy to be damaged when demolding. The residual stress problem will also affect the use of the lens.
In addition, the temperature, pressure, and viscosity of the polymer fluid during molding may affect the surface morphology of the free-form surface lens, thereby affecting its optical performance and lighting effect
From the above, it can be known that the traditional molded lens processing method has serious deficiencies

Method used

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Experimental program
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Effect test

Embodiment 1

[0042] The invention forms crater-shaped grooves on the polymer surface through the gravity and surface tension of the non-phase solution drop itself, and realizes the shape control of the lens through the evaporation of the non-phase solution drop and the solidification of the polymer. The crater-shaped groove size is controlled by the droplet size. An immiscible solution droplet refers to a liquid droplet that is immiscible with the polymer.

[0043] The concrete steps of this embodiment are as follows:

[0044] Step 1. Transfer the polymer to the LED module and cover the LED chip.

[0045] See figure 1 , using a dispensing device (3) to transfer the polymer (2) to the LED module (1) and cover the LED chip (8). The amount of polymer transferred to the LED module (1) can be controlled by using a dispensing device (3) so that it assumes a natural Lambertian state. The polymer in this embodiment is silica gel.

[0046] Step 2, transfer the immiscible solution droplet to th...

Embodiment 2

[0056] See Figure 17 , The difference between this embodiment and Embodiment 1 is that a connecting rod (6) is added above the immiscible solution drop (5), and the connecting rod (6) is made of a hydrophilic material, such as a copper rod or an iron rod. After the immiscible solution drop (5) drops onto the surface of the polymer (2), the connecting rod (6) touches the upper surface of the immiscible solution drop (5), and then pushes the connecting rod (6) downwards, and is controlled by its adhesion. The phase solution droplets (5) penetrate deep into the polymer (2), thereby controlling the morphology of the crater-shaped grooves. One end of the connecting rod (6) contacting the drop of the immiscible solution (5) is a round end.

[0057] The radius of the connecting rod directly determines the size of the adsorbed droplet at its lower end. The larger the radius, the larger the adsorbed droplet, and the smaller the adsorbed droplet, the size of the crater-shaped groove o...

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Abstract

The invention discloses an LED packaging lens appearance control method. The method comprises steps: 1, dispensing equipment is adopted for shifting a polymer or molten glass for preparing the lens to an LED module, and an LED chip is covered; 2, the dispensing equipment or a micro syringe is adopted for shifting liquid drops which are not dissolved with the polymer to the surface of the polymer; and 3, a heating method is adopted for curing the polymer and evaporating the liquid drops, and a lens with a volcanic vent-shaped groove is acquired. The method of the invention can be applied to various LED packaging forms such as a support form, a chip on board form, an array form, a system packaging form, a printed circuit board packaging form and a silicon-based packaging form, and has the advantages that the processing cost is reduced, the processing cycle is shortened, the surface finishment of the lens is greatly improved, and the optical performance of the LED product can be improved.

Description

technical field [0001] The invention belongs to the technical field of LED packaging, and more specifically relates to a method for controlling the shape of an LED packaging lens. Background technique [0002] LED (Light Emitting Diode) is a semiconductor light-emitting device based on the principle of P-N junction electroluminescence. It has the advantages of high electro-optical conversion efficiency, long service life, environmental protection and energy saving, and small size. It is known as the green lighting source in the 21st century. If LED can be used in the field of traditional lighting, it will achieve a very significant energy-saving effect, which is of great significance in today's increasingly tense global energy sources. With the breakthrough of the third-generation semiconductor material technology represented by nitrides, the semiconductor lighting industry based on high-power and high-brightness light-emitting diodes (LEDs) is rapidly emerging in the world,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/58
CPCH01L33/58
Inventor 郑怀郭醒楚劲草雷翔刘胜
Owner WUHAN UNIV