LED device

Abstract

The utility model relates to the field of semiconductor light emitting technology, and discloses an LED device, including a bracket, an LED light emitting chip, a fluorescent glue layer, a diffusion glue layer and a lens. The LED light emitting chip is arranged on the bracket, and the fluorescent glue layer covers the upper surface of the LED light emitting chip. The diffusion glue layer is arranged on the bracket and covers the upper surface and side surface of the fluorescent glue layer, as well as the side surface of the LED light emitting chip, and diffusion particles are arranged therein. The lens is arranged on the bracket and fits tightly on the top of the diffusion glue layer. The side surface of the fluorescent glue layer is provided with a concave structure or an inverted cone structure, which is used to shorten the optical path of the outgoing light around the edges of the LED light emitting chip in the fluorescent glue layer. The concave structure and the inverted cone structure of the utility model effectively prevent the edges around the light spot from yellowing, ensure the consistency of the light color, and improve the light efficiency and light flux. The setting of the diffusion glue layer further ensures uniform light output. The refractive index of the diffusion glue layer is less than the refractive index of the lens, and the light collection effect is good and the irradiation is precise.

Description

Technical Field

[0001] The utility model belongs to the technical field of semiconductor light emitting, and specifically relates to an LED device. Background Art

[0002] Semiconductor light sources are widely used in various lighting devices, especially in various electronic devices, because of their advantages of small size, low power consumption, long service life, high brightness, etc. LED light sources are common semiconductor light sources.

[0003] In order to achieve wavelength conversion, existing LED light sources usually apply a fluorescent glue layer on the light-emitting surface of the LED light-emitting chip. The existing problems are: the edges of the light spot are yellowed, the color is inconsistent, and the light output is uneven, resulting in poor quality of the light spot of the packaged finished product and low light efficiency.

[0004] Based on the above, the problem to be solved at present is: to provide an LED device with uniform light output, consistent color, good light collection effect, precise illumination and high light efficiency. Utility Model Content

[0005] The utility model aims to provide an LED device, aiming to solve the problems in the prior art of inconsistent color of the light spot of the LED device, uneven light output, inaccurate illumination and low light efficiency.

[0006] The utility model is implemented as follows: an LED device comprises:

[0007] Bracket;

[0008] An LED light-emitting chip is arranged on the bracket;

[0009] A fluorescent adhesive layer covering the upper surface of the LED light-emitting chip;

[0010] A diffusion adhesive layer is arranged on the bracket and covers the upper surface and side surfaces of the fluorescent adhesive layer and the side surfaces of the LED light-emitting chip; diffusion particles are arranged in the diffusion adhesive layer;

[0011] A lens is disposed on the bracket and is closely attached to the top of the diffusion adhesive layer;

[0012] The side surface of the fluorescent glue layer is provided with a concave structure or an inverted cone structure, which is used to shorten the optical path of the edge emitted light from the LED light-emitting chip in the fluorescent glue layer.

[0013] Furthermore, the concave structure is a curved surface that is recessed toward the inside of the fluorescent glue layer.

[0014] Furthermore, the length L of the upper surface of the fluorescent glue layer is less than or equal to the length W of the upper surface of the LED light-emitting chip.

[0015] Furthermore, the inverted cone structure is an inclined curved surface or a plane that gradually approaches the optical axis from the LED light-emitting chip towards the lens direction.

[0016] Furthermore, the refractive index of the diffusion glue layer is less than that of the lens.

[0017] Furthermore, the lens includes a first optical interface on the side close to the diffusion glue layer and a second optical interface on the side背离 the diffusion glue layer, and the first optical interface and the second optical interface are set as a plane or a free-form surface.

[0018] Furthermore, the first optical interface is a plane or a micro-arc surface, and the second optical interface is a convex curved surface.

[0019] Furthermore, the top view contour line of the second optical interface is circular or rectangular or elliptical or a shape between a rectangle and an ellipse.

[0020] Compared with the prior art, an LED device provided by the present utility model has the following beneficial effects:

[0021] 1. The concave structure 31 and the inverted cone structure 32 of the fluorescent glue layer 3 of the present utility model shorten the optical path of the light emitted from the four peripheral edges of the LED light-emitting chip 2 compared with the vertical plane 33 of the fluorescent glue layer 3 of the prior art. Refer to Figure 3 、 Figure 5 , the optical paths of the light emitted from the four peripheral edges of the present utility model are D1 and D3 respectively, and the optical paths of the light emitted from the four peripheral edges of the prior art are D2 and D4 respectively. Obviously, D1 < D2 and D3 < D4. The shortening of the optical path can prevent the light at large angles at the edges from exciting excessive phosphor, and can weaken the yellowing of the light spot edge caused by the excessive excitation of the phosphor by the blue light. Finally, the light output of the LED device is made uniform and the color is consistent, further improving the light efficiency and luminous flux.

[0022] 2. Diffusion particles are provided in the diffusion glue layer 4. The light after the action of the fluorescent glue layer 3 enters the diffusion glue layer 4, and the light of different colors is scattered in the diffusion glue layer 4, and after multiple interleaved mixtures, it is emitted after the optical adjustment of the lens 5. The diffusion glue layer 4 makes the light output uniform and the color uniform, can improve the light efficiency, and ensure the light output quality. At the same time, the diffusion glue layer 4 also has the function of connecting the lens 5 and the bracket 1, making the structure of the entire LED device more stable.

[0023] 3. The refractive index of the diffusion glue layer 4 is less than that of the lens 5, and this setting has a good light collection effect and high light energy utilization rate. By setting the surface shape of the lens 5, the emitted light can accurately reach the preset optical angle and light intensity range, meeting the needs of the application scenario. Description of the Drawings

[0024] Figure 1It is a schematic diagram of the cross-sectional structure of the LED device provided by the utility model;

[0025] Figure 2 It is a cross-sectional view of the LED light-emitting chip and the fluorescent adhesive layer combination provided by the utility model;

[0026] Figure 3 This is a comparison diagram of the optical path length of the fluorescent adhesive layer provided by the utility model and the fluorescent adhesive layer of the prior art;

[0027] Figure 4 This is a schematic cross-sectional structure diagram of another LED device provided by the utility model;

[0028] Figure 5 This is a comparison diagram of the optical path length of another fluorescent adhesive layer provided by the utility model and the fluorescent adhesive layer of the prior art;

[0029] Figure 6 It is a front view of the lens provided by the utility model;

[0030] Figure 7 It is a top view of the lens provided by the utility model;

[0031] In the figure: 1- bracket; 2- LED light emitting chip; 3- fluorescent adhesive layer; 31- concave structure; 32-C; 33- vertical plane; 4- diffusion adhesive layer; 5- lens; 51- first optical interface; 52- second optical interface; OO'- optical axis. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0033] The implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0034] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present utility model, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] Reference Figure 1-7As shown, it is a preferred embodiment provided by the present utility model.

[0036] The LED device of the present utility model includes: a bracket 1, an LED light-emitting chip 2, a fluorescent glue layer 3, a diffusion glue layer 4, and a lens 5. Refer to Figure 1 , Figure 4 . The LED light-emitting chip 2 is fixed on the bracket 1. The fluorescent glue layer 3 closely covers the upper surface of the LED light-emitting chip 2 and is used to convert the light emitted by the LED light-emitting chip 2 into a preset light-emitting color. The lens 5 is arranged above the fluorescent glue layer 3, and the bottom surface around the lens 5 is connected to the top surface around the bracket 1. A diffusion glue layer 4 is filled between the lens 5 and the bracket 1. The diffusion glue layer 4 covers the upper surface and the side surface of the fluorescent glue layer 3 and covers the side surface of the LED light-emitting chip 2. Preferably, the diffusion glue layer 4 fills the gap between the lens 5 and the bracket 1. Diffusion particles are provided in the diffusion glue layer 4, and the diffusion particles have a scattering effect on light. When light is incident on the light-scattering particles, it will deviate from the original incident direction and scatter in all directions. Each light-scattering particle is equivalent to a virtual light source that emits light in all directions, so that the light output from the diffusion glue layer 4 is more uniform. The light after the action of the fluorescent glue layer 3 enters the diffusion glue layer 4, and lights of different colors are scattered in the diffusion glue layer 4. After lights of different colors intersect and mix multiple times in the diffusion glue layer 4, they are then emitted after the optical adjustment of the lens 5. The diffusion glue layer 4 makes the light-emitting color uniform, can improve the light efficiency, and ensure the light output quality. At the same time, the diffusion glue layer 4 also has the function of connecting the lens 5 and the bracket 1, making the structure of the entire LED device more stable.

[0037] Two implementation manners of the fluorescent glue layer 3:

[0038] Manner 1: Refer to Figure 1 , the side surface of the fluorescent glue layer 3 is provided with a concave structure 31, and the concave structure 31 is an arc surface that is recessed into the interior of the lens 5. The concave structure 31 shortens the optical path of the light emitted from the four peripheral edges of the LED light-emitting chip 2 compared with the vertical plane 33 of the fluorescent glue layer 3 in the prior art. Refer to Figure 3 , the optical paths of the light emitted from the four peripheral edges of the present utility model and the prior art are D1 and D2 respectively. Obviously, D1 < D2, so that the large-angle light at the edge will not excite an excessive amount of phosphor. For example, it can effectively prevent the situation that the edge of the light spot turns yellow due to the excessive excitation of the phosphor by blue light. Finally, the light output of the LED light source device is made uniform and the color is consistent, further improving the light efficiency and luminous flux.

[0039] Further, refer to Figure 2, on the same cross-section, the length L of the upper surface of the fluorescent glue layer 3 is less than or equal to the length W of the upper surface of the LED light-emitting chip 2, which is more conducive to the formation of the concave structure 31, enabling the concave structure 31 to effectively play the role of shortening the optical path. If the length L of the upper surface of the fluorescent glue layer 3 is greater than the length W of the upper surface of the LED light-emitting chip 2, on the one hand, it is difficult to form the concave structure 31, and the distance where L is greater than W is equivalent to increasing the optical path, making the setting of the concave structure 31 prone to failure.

[0040] Method 2: Refer to Figure 4 , an inverted cone structure 32 is provided on the side surface of the fluorescent glue layer 3. The inverted cone structure 32 is an inclined curved surface or plane that gradually approaches the optical axis OO' from the LED light-emitting chip 2 towards the lens 5. The inverted cone structure 32 shortens the optical path of the light emitted from the four peripheral edges of the LED light-emitting chip 2 compared to the vertical plane 33 of the fluorescent glue layer 3 in the prior art. Refer to Figure 5 , the optical paths of the light emitted from the four peripheral edges of the present invention and the prior art are D3 and D4 respectively. Obviously, D3 < D4, so that the large-angle light at the edge will not excite an excessive amount of phosphor. For example, it can effectively prevent the edge of the light spot from turning yellow due to the excessive excitation of the phosphor by blue light. Finally, the light output of the LED light source device is uniform, the color is consistent, and the light efficiency and luminous flux are further improved.

[0041] Preferably, the refractive index of the diffusing glue layer 4 is less than that of the lens 5, so that the light collection effect of the lens 5 is better and the light energy utilization rate is higher.

[0042] The light emitted by the LED light-emitting chip 2 undergoes wavelength conversion by the fluorescent glue layer 3 and then scattering by the diffusing glue layer 4, resulting in uniform light output, uniform color, and high light efficiency. Finally, through the optical shaping of the lens 5, the light collection effect is good, and the emitted light accurately reaches the preset optical angle and light intensity range. The lens 5 includes a first optical interface 51 on the side close to the diffusing glue layer 4 and a second optical interface 52 on the side背离 the diffusing glue layer 4. The first optical interface 51 and the second optical interface 52 are planes or free-form surfaces. The surface shapes of the first optical interface 51 and the second optical interface 52 are set according to the application scenario to meet the needs of the application scenario. Preferably, referring to Fig. 1, Figure 4 、 Figure 6 , the first optical interface 51 is a plane or a micro-arc surface, and the second optical interface 52 is a convex curved surface. The top view contour of the second optical interface 52 is circular or rectangular or elliptical or a shape between a rectangle and an ellipse. Refer to Figure 7 .

[0043] The above is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An LED device, characterized in that: include: Bracket (1); An LED light-emitting chip (2), which is arranged on the bracket (1); A fluorescent glue layer (3), which covers the upper surface of the LED light-emitting chip (2); a diffusion adhesive layer (4) which is arranged on the support (1) and covers the upper surface and side surfaces of the fluorescent adhesive layer (3), and covers the side surfaces of the LED light-emitting chip (2); the diffusion adhesive layer (4) has diffusion particles arranged therein; A lens (5) disposed on the support (1) and tightly attached to the top of the diffusion adhesive layer (4); The side surface of the fluorescent glue layer (3) is provided with a concave structure (31) or an inverted cone structure (32) for shortening the optical path of the edge emitted light from the LED light-emitting chip (2) in the fluorescent glue layer (3).

2. The LED device according to claim 1, characterized in that: The concave structure (31) is a curved surface that is concave toward the inside of the fluorescent glue layer (3).

3. The LED device according to claim 2, characterized in that: The length L of the upper surface of the fluorescent glue layer (3) is less than or equal to the length W of the upper surface of the LED light-emitting chip (2).

4. The LED device according to claim 1, characterized in that: The inverted cone structure (32) is an inclined curved surface or a plane that gradually approaches the optical axis (OO') in the direction from the LED light-emitting chip (2) to the lens (5).

5. The LED device according to claim 1, characterized in that: The refractive index of the diffusion adhesive layer (4) is smaller than the refractive index of the lens (5).

6. The LED device according to claim 1, characterized in that: The lens (5) comprises a first optical interface (51) on a side close to the diffusion adhesive layer (4) and a second optical interface (52) on a side away from the diffusion adhesive layer (4), wherein the first optical interface (51) and the second optical interface (52) are arranged as planes or free-form surfaces.

7. The LED device according to claim 6, characterized in that: The first optical interface (51) is a plane or a slightly curved surface, and the second optical interface (52) is a convex curved surface.

8. The LED device according to claim 6, characterized in that: The top view contour line of the second optical interface (52) is circular, rectangular, elliptical, or a shape between rectangular and elliptical.

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