LED packaging lens assembly capable of uniformly emitting light

Abstract

The utility model discloses an LED packaging lens assembly with uniform light emitting, which comprises a substrate, LED light-emitting chips and a packaging lens, the LED light-emitting chips comprise at least one LED red light-emitting chip, at least one LED green light-emitting chip and at least one LED blue light-emitting chip, the LED light-emitting chips are fixedly arranged on the substrate, and the packaging lens is arranged on the substrate. The packaging lens is fixed on the substrate and covers the LED light-emitting chips, a plurality of concave lens structures are arranged on the portion, located above the LED light-emitting chips, of the packaging lens, and each concave lens structure corresponds to one LED light-emitting chip. According to the utility model, through the concave lens structures corresponding to the LED light-emitting chips, the light of the plurality of LED light-emitting chips is refracted and emitted uniformly, so that the local condensation phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to an LED packaging component, in particular to an LED packaging lens component with uniform light output. Background Art

[0002] LED packaging can effectively protect the light-emitting chip and prevent the chip from failing due to long-term exposure to the air or mechanical damage. The lens used in LED packaging can refract light and change the light path, and is widely used in the fields of lighting, photography, and telescopes.

[0003] Currently, most existing LED packaging components are hemispherical lenses, which have a convergence effect on light, concentrating the light in a small area, resulting in uneven light output, which is prone to cause local overtemperature, thereby reducing the service life of the LED. In addition, the commonly used LED has a high blue light component, which is very harmful to the human eye. When used for outdoor lighting, it is necessary to overcome complex external interference such as rain, snow, and dust. Usually, a transparent glass cover is installed outside the LED lens to effectively block it, but it will change the original ideal refraction light path, thereby affecting the uniform light output effect. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the task of the utility model is to provide an LED packaging lens assembly with uniform light output, so as to improve the light output uniformity of multi-core LEDs.

[0005] The technical solution of the utility model is as follows: an LED packaging lens assembly with uniform light output, comprising a substrate, an LED light-emitting chip and a packaging lens, wherein the LED light-emitting chip comprises at least one LED red light-emitting chip, at least one LED green light-emitting chip and at least one LED blue light-emitting chip, wherein the LED light-emitting chip is fixedly arranged on the substrate, the packaging lens is fixed to the substrate and covers the LED light-emitting chip, and a portion of the packaging lens located above the LED light-emitting chip is provided with a plurality of concave lens structures, and each of the concave lens structures corresponds to one of the LED light-emitting chips.

[0006] Furthermore, the LED red light-emitting chip, LED green light-emitting chip and LED blue light-emitting chip are arranged in a 3*3 matrix, and each row, each column and each oblique line contains one LED red light-emitting chip, one LED green light-emitting chip and one LED blue light-emitting chip.

[0007] Furthermore, the light-emitting surface of the concave lens structure satisfies the arc surface equation

[0008]

[0009] Wherein I is the luminous intensity of the LED light-emitting chip corresponding to the concave lens structure, H is the vertical distance from the LED light-emitting chip corresponding to the concave lens structure to the light-emitting surface, L is the distance from the center of the LED light-emitting chip corresponding to the concave lens structure to the edge of the concave lens structure, and α is the angle between the line from the center of the LED light-emitting chip corresponding to the concave lens structure to the edge of the concave lens structure and the vertical direction.

[0010] Furthermore, a surface of the packaged lens is provided with an anti-blue light coating, and the thickness of the anti-blue light coating is 10 to 100 microns.

[0011] Furthermore, the anti-blue light coating is a silicon nitride, boron nitride or aluminum nitride coating.

[0012] Furthermore, the refractive index of the anti-blue light coating is the same as the refractive index of the packaging lens.

[0013] Furthermore, a surface mount heat sink is provided on the substrate.

[0014] The advantages of the utility model compared with the prior art are:

[0015] By setting a concave lens structure at the top of each LED light-emitting chip, the concave lens structure diverges and refracts the light of the LED light-emitting chip, so that the uniformity of the packaged LED light emission is improved and local focusing phenomenon is avoided; multiple LED light-emitting chips are packaged in the same component, and LED chips with different light-emitting frequencies and light-emitting intensities can be selected to ultimately obtain light sources of different colors and intensities; adding an anti-blue light coating can absorb blue light to a certain extent and improve the light output quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an LED package lens assembly with uniform light output according to an embodiment.

[0017] Figure 2 It is a top view schematic diagram of an LED package lens assembly with uniform light output according to an embodiment.

[0018] Figure 3 The schematic diagram is for determining the light-emitting surface parameters of the concave lens structure of the encapsulated lens. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the embodiments, but is not intended to limit the present invention.

[0020] Please combine Figures 1 to 3As shown, the present embodiment involves an LED package lens assembly with uniform light output, including a substrate, an LED light-emitting chip, a package lens, and a surface-mount heat sink. The LED light-emitting chip is packaged and fixed on the substrate. According to the different requirements for the final LED light color and intensity, LED light-emitting chips with different light-emitting intensities are selected. Generally speaking, the LED light-emitting chip includes at least one LED red light-emitting chip, one LED green light-emitting chip, and one LED blue light-emitting chip. In the present embodiment, in order to achieve the best color mixing and uniform light output effect, 9 LED light-emitting chips are packaged on the substrate, namely three LED red light-emitting chips, three LED green light-emitting chips, and three LED blue light-emitting chips. These LED light-emitting chips are distributed in a 3*3 matrix, and it is ensured that each row, each column, and each oblique line has a LED red light-emitting chip, a LED green light-emitting chip, and a LED blue light-emitting chip. The specific arrangement of the LED light-emitting chips in this embodiment is as follows Figure 2 As shown, the first row from left to right is LED red light-emitting chip, LED green light-emitting chip and LED blue light-emitting chip; the second row from left to right is LED blue light-emitting chip, LED red light-emitting chip and LED green light-emitting chip; the third row from left to right is LED green light-emitting chip, LED blue light-emitting chip and LED red light-emitting chip.

[0021] A packaging lens is fixed to the substrate and covers the LED light-emitting chip, that is, the packaging lens encloses all nine LED light-emitting chips inside and isolates them from the outside world, which can effectively avoid interference from external impurities such as dust. In addition, a concave lens structure is set on the packaging lens. Specifically, a concave curved surface is set on the light-emitting surface of the packaging lens (away from the top surface of the LED light-emitting chip) to form a concave lens structure, and the concave lens structure is multiple and corresponds to each LED light-emitting chip. In other words, there are nine concave lens structures on the light-emitting surface of the packaging lens, which correspond to the positions of the nine LED light-emitting chips one by one. By utilizing the divergent refraction of light by the concave lens, the uniformity of the combined light output formed by each LED light-emitting chip is improved.

[0022] As a preferred embodiment, the light-emitting surface of each concave lens structure satisfies the arc surface equation

[0023]

[0024] Where I is the luminous intensity of the LED light-emitting chip corresponding to the concave lens structure, H is the vertical distance from the LED light-emitting chip corresponding to the concave lens structure to the light-emitting surface, L is the distance from the center of the LED light-emitting chip corresponding to the concave lens structure to the edge of the concave lens structure, and α is the angle between the line from the center of the LED light-emitting chip corresponding to the concave lens structure to the edge of the concave lens structure and the vertical direction. The above equation mainly considers the influence of adjacent light sources on the light intensity of the light-emitting surface, and does not consider the influence of the secondary adjacent light source on the light intensity. Using these specific concave lens structures can further enhance the dispersion of light from the LED light-emitting chip and avoid local focusing.

[0025] In addition, in this embodiment, in order to reduce the blue light component in the light emission, a 10 to 100 micron anti-blue light coating is applied to the outside of the package lens. The anti-blue light coating is sprayed after mixing a hydrophobic anti-blue light material and an adhesive, and then formed after drying. The hydrophobic anti-blue light material is silicon nitride, boron nitride or aluminum nitride, and the adhesive is acrylic acid or polyurethane. The refractive index of the anti-blue light coating is the same as that of the package lens to ensure the light output quality. In order to improve the heat dissipation performance of the component, a patch heat sink is also provided on the substrate around the periphery of the package lens to dissipate heat and ensure the stability of light output.

Claims

1. An LED package lens assembly with uniform light output, characterized in that: It includes a substrate, an LED light-emitting chip and a packaging lens, wherein the LED light-emitting chip includes at least one LED red light-emitting chip, an LED green light-emitting chip and an LED blue light-emitting chip, the LED light-emitting chip is fixedly arranged on the substrate, the packaging lens is fixed to the substrate and covers the LED light-emitting chip, and the portion of the packaging lens located above the LED light-emitting chip is provided with a plurality of concave lens structures, and each of the concave lens structures corresponds to one of the LED light-emitting chips.

2. The LED package lens assembly with uniform light output according to claim 1, characterized in that: The LED red light-emitting chip, LED green light-emitting chip and LED blue light-emitting chip are arranged in a 3*3 matrix, and each row, each column and each oblique line contains one LED red light-emitting chip, one LED green light-emitting chip and one LED blue light-emitting chip.

3. The LED package lens assembly with uniform light output according to claim 1, characterized in that: The light-emitting surface of the concave lens structure satisfies the arc surface equation Wherein I is the luminous intensity of the LED light-emitting chip corresponding to the concave lens structure, H is the vertical distance from the LED light-emitting chip corresponding to the concave lens structure to the light-emitting surface, L is the distance from the center of the LED light-emitting chip corresponding to the concave lens structure to the edge of the concave lens structure, and α is the angle between the line from the center of the LED light-emitting chip corresponding to the concave lens structure to the edge of the concave lens structure and the vertical direction.

4. The LED package lens assembly with uniform light output according to claim 1, characterized in that: The surface of the packaged lens is provided with an anti-blue light coating, and the thickness of the anti-blue light coating is 10 to 100 microns.

5. The LED package lens assembly with uniform light output according to claim 4, characterized in that: The anti-blue light coating is a silicon nitride, boron nitride or aluminum nitride coating.

6. The LED package lens assembly with uniform light output according to claim 4, characterized in that: The refractive index of the anti-blue light coating is the same as the refractive index of the packaging lens.

7. The LED package lens assembly with uniform light output according to claim 1, characterized in that: A surface mount heat sink is arranged on the substrate.

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