Light source device

Abstract

The invention relates to the technical field of semiconductor light emitting, and discloses a light source device which comprises a support, a light-emitting chip, a first light-transmitting glue layer, a high-reflection glue layer and a second light-transmitting glue layer. The light-emitting chip is arranged in the support. The first light-transmitting glue layer covers the front face and the side face of the light-emitting chip. The high-reflection glue layer is arranged on the periphery of the first light-transmitting glue layer and in the support. And the interface of the first light-transmitting glue layer and the high-reflection glue layer is arranged to be a reflection surface which forms a certain angle with the front surface of the light-emitting chip. The second light-transmitting glue layer is arranged above the high-reflection glue layer and completely covers the first light-transmitting glue layer, and the second light-transmitting glue layer is used for optimizing and shaping the light beams or changing the color of the emitted light. The light source device realizes front light emitting, fully utilizes side light, and is high in light energy utilization rate and good in brightness. Meanwhile, the second light-transmitting glue layer containing the fluorescent powder is separated from the light-emitting chip, so that the light-emitting efficiency is high, the light-emitting color is uniform and stable, and the service life is long.

Description

Technical Field

[0001] The present invention belongs to the technical field of semiconductor light emitting, and in particular, relates to a light source device. Background Art

[0002] In order to realize the special optical function of the light source device, a transparent glue layer or a fluorescent glue layer needs to be coated on the surface of the light-emitting chip. At present, the coating process mainly uses electrophoresis, spraying, sputtering and other methods to achieve good results. However, due to the complex process, expensive equipment and serious material waste, the process cost is too high and it is not suitable for low-cost mass production.

[0003] The existing technology realizes this by using a bowl-cup structure bracket to carry the fluorescent glue, which can achieve low-cost mass production under the limitation of the bowl-cup structure. Figure 3 The light source device of the prior art includes a bracket 1, a light-emitting chip 2 arranged in the bracket 1, the front and side of the light-emitting chip 2 are covered with a first light-transmitting adhesive layer 3, and the outer periphery of the side of the first light-transmitting adhesive layer 3 is surrounded by a high-reflective adhesive layer 4. The first light-transmitting adhesive layer 3 can be set as a fluorescent adhesive layer. Due to the existence of the high-reflective adhesive layer 4, the side light of the light-emitting chip 2 will be reflected back into the first light-transmitting adhesive layer 3, so that the light-emitting chip 2 can emit light from the front. However, there is a problem that the interface between the first light-transmitting adhesive layer 3 and the high-reflective adhesive layer 4 is a vertical plane. When the light emitted from the side of the light-emitting chip 2 is incident on the high-reflective adhesive layer 4, it returns to the side of the light-emitting chip 2. The emitted light from the side of the light-emitting chip 2 propagates back and forth between the first light-transmitting adhesive layer 3 and the high-reflective adhesive layer 4. After several round trips, the light is absorbed by the material itself. The light from the side of the light-emitting chip 2 can reach very little of the front light, and the light energy utilization rate is low.

[0004] In addition, when the first light-transmitting adhesive layer 3 is set as a fluorescent adhesive layer, the fluorescent adhesive layer is in direct contact with the light-emitting chip 2, and the temperature of the fluorescent adhesive layer will rise rapidly when the light-emitting chip 2 is working, and the fluorescent adhesive layer will age due to the heat generated by the light-emitting chip 2, resulting in a decrease in its luminous efficiency. In addition, the color coordinates of the fluorescent adhesive layer will also shift due to the increase in the working environment temperature, ultimately affecting the luminous efficiency, luminous color and service life of the light source device.

[0005] Based on the above, the problem to be solved at present is: to provide a light source device with front light emission, high light energy utilization rate, uniform and stable light color, long service life and high light spot quality. Summary of the invention

[0006] The purpose of the present invention is to provide a light source device, aiming to solve the problems in the prior art that the light source device has low light energy utilization rate, uneven light color, easy aging, and unsatisfactory light spot quality.

[0007] Light source device, including:

[0008] Bracket;

[0009] A light-emitting chip is disposed in the bracket;

[0010] A first light-transmitting adhesive layer, which covers the front and side surfaces of the light-emitting chip;

[0011] A highly reflective adhesive layer, which is arranged on the periphery of the first light-transmitting adhesive layer and inside the bracket; the interface between the first light-transmitting adhesive layer and the highly reflective adhesive layer is set as a reflective surface that is at a certain angle to the front surface of the light-emitting chip, and the reflective surface is used to reflect the emitted light from the side of the light-emitting chip to the front surface;

[0012] The second light-transmitting adhesive layer is arranged above the high-reflective adhesive layer and completely covers the first light-transmitting adhesive layer. The second light-transmitting adhesive layer is used to optimize, shape or change the light beam color.

[0013] Furthermore, the first light-transmitting adhesive layer and the second light-transmitting adhesive layer are tightly attached to each other or a cavity structure is provided between the first light-transmitting adhesive layer and the second light-transmitting adhesive layer.

[0014] Furthermore, the second light-transmitting adhesive layer is configured as a light-transmitting medium including at least fluorescent powder.

[0015] Furthermore, a cross section of the reflective surface tapers from the front surface of the light emitting chip toward the bottom surface of the light emitting chip.

[0016] Furthermore, the reflecting surface is set to be a flat surface or a curved surface.

[0017] Furthermore, the front side of the first light-transmitting adhesive layer is a flat surface or a slightly curved surface.

[0018] Furthermore, the light emitting surface of the second light-transmitting adhesive layer is configured as a plane or a free-curved surface.

[0019] The present invention provides a reflective surface at a certain angle to the front of the light-emitting chip on the side of the light-emitting chip, and the reflective surface is the interface between the first light-transmitting adhesive layer and the high-reflective adhesive layer. The reflective surface can reflect the emitted light from the side of the light-emitting chip to the front of the light-emitting chip. Compared with the prior art, Figure 3 , making full use of the side light, further improving the brightness of the front light, and improving the utilization rate of light energy. The second light-transmitting adhesive layer is attached to the top of the high-reflective adhesive layer and completely covers the front of the first light-transmitting adhesive layer. After the light beam passes through the first light-transmitting adhesive layer, it is emitted from the front of the first light-transmitting adhesive layer and enters the second light-transmitting adhesive layer. The second light-transmitting adhesive layer optimizes and shapes the incident light beam to achieve the preset light output angle, brightness and uniformity, etc., ensuring the high quality of the light spot.

[0020] The second light-transmitting adhesive layer can be set as a light-transmitting medium that at least includes phosphors. In the traditional method, the phosphor adhesive layer directly covers the light-emitting chip. When the light-emitting chip is working, the temperature of the phosphor adhesive layer will rise rapidly, and the phosphor adhesive layer will age due to the heat generated by the light-emitting chip, causing its luminous efficiency to decrease. In addition, the color coordinates of the phosphor adhesive layer will also shift due to the increase in the working environment temperature, which will ultimately affect the luminous efficiency, luminous color and service life of the light source device. The present invention separates the second light-transmitting adhesive layer with phosphors from the light-emitting chip to solve the above problems. Combined with the surface setting of the second light-transmitting adhesive layer, the light source device has high luminous efficiency, uniform and stable luminous color and long service life, ensuring the high quality of the light spot. The structure of the present invention is reasonable and simple, easy to manufacture, and has low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic cross-sectional structural diagram of a light source device according to Embodiment 1 provided by the present invention;

[0022] Figure 2 is a schematic cross-sectional structural diagram of a light source device according to Embodiment 2 provided by the present invention;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of a light source device in the prior art;

[0024] In the figure: 1- bracket; 2- light-emitting chip; 3- first light-transmitting adhesive layer; 4- high-reflective adhesive layer; 41- reflecting surface; 5- second light-transmitting adhesive layer; 51- light-emitting surface; 6- cavity structure. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0027] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, 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 invention 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.

[0028] Reference Figure 1-3 The figure shows a preferred embodiment of the present invention.

[0029] Reference Figure 1-2 The light source device includes a bracket 1, a light emitting chip 2, a first light-transmitting adhesive layer 3, a highly reflective adhesive layer 4, and a second light-transmitting adhesive layer 5. The bracket 1 is preferably in a bowl-cup shape, and can also be set as a flat bracket as needed. The light emitting chip 2 is solid-crystaled on the bottom surface of the bracket 1, and the electrode of the light emitting chip 2 is arranged on the bottom surface of the light emitting chip 2. The first light-transmitting adhesive layer 3 covers the front and surrounding sides of the light emitting chip 2 to improve the light extraction rate of the light emitting chip 2. The front of the first light-transmitting adhesive layer 3 is preferably a flat surface or a slightly curved surface, which can further improve the uniformity of the light output.

[0030] A high-reflective adhesive layer 4 with high reflective effect is provided on the inner side of the bracket 1 and the outer side of the first light-transmitting adhesive layer 3. The high-reflective adhesive layer 4 is preferably a high-reflective white adhesive layer. The high-reflective adhesive layer 4 is tightly coated on the four sides of the first light-transmitting adhesive layer 3. The interface between the high-reflective adhesive layer 4 and the first light-transmitting adhesive layer 3 forms a reflective surface 41. The reflective surface 41 forms a certain angle with the front of the light-emitting chip 2. The angle satisfies that when the edge of the light-emitting chip 2 has a large angle and is incident on the reflective surface 41, total reflection is easy to occur. After reflection, the edge light is emitted from the front of the light-emitting chip 2. The cross-section of the reflective surface 41 gradually shrinks from the front of the light-emitting chip 2 to the bottom of the light-emitting chip 2. The reflective surface 41 is preferably a plane or a curved surface.

[0031] The second light-transmitting adhesive layer 5 is attached to the top of the high-reflective adhesive layer 4 and completely covers the front of the first light-transmitting adhesive layer 3. After the light emitted by the light-emitting chip 2 passes through the first light-transmitting adhesive layer 3, it is emitted from the front of the first light-transmitting adhesive layer 3 and enters the second light-transmitting adhesive layer 5. The second light-transmitting adhesive layer 5 optimizes and shapes the incident light beam to achieve a preset light output angle, brightness, uniformity, etc. The light-emitting surface of the second light-transmitting adhesive layer 5 is set to a plane or a curved surface according to the needs of the light output effect. The second light-transmitting adhesive layer 5 can be set to a light-transmitting medium that includes at least phosphor powder, which is used to change the color of the light output. For example, the blue light emitted by the blue light chip is excited by the phosphor powder to form white light output. In the traditional way, the phosphor powder adhesive layer directly covers the light-emitting chip, and the phosphor powder adhesive layer is in direct contact with the light-emitting chip. When the light-emitting chip is working, the temperature of the phosphor powder adhesive layer will rise rapidly, and the phosphor powder adhesive layer will age due to the heat generated by the light-emitting chip, resulting in a decrease in its luminous efficiency. In addition, the color coordinates of the phosphor glue layer will also shift due to the increase in the working environment temperature, which will eventually affect the luminous efficiency, luminous color and service life of the light source device. However, this arrangement separates the second light-transmitting glue layer 5 with phosphor from the light-emitting chip 2, which can solve the above problems. Combined with the surface setting of the second light-transmitting glue layer 5, the light source device has high luminous efficiency, uniform and stable luminous color and long service life.

[0032] Example 1: Reference Figure 1The light source device includes a bowl-shaped bracket 1, a light-emitting chip 2 arranged at the bottom of the bracket 1, a first light-transmitting adhesive layer 3 covering the front and side surfaces of the light-emitting chip 2, and a high-reflective adhesive layer 4 surrounding the outer periphery of the first light-transmitting adhesive layer 3. The interface between the first light-transmitting adhesive layer 3 and the high-reflective adhesive layer 4 forms an emitting surface 41 having a certain angle with the front surface of the light-emitting chip 2. The second light-transmitting adhesive layer 5 is arranged on the high-reflective adhesive layer 4 and completely covers the first light-transmitting adhesive layer 3, and the upper surface of the first light-transmitting adhesive layer 3 is tightly attached to the lower surface of the second light-transmitting adhesive layer 5. By setting different refractive indices for the first light-transmitting adhesive layer 3 and the second light-transmitting adhesive layer 5, a preset light-emitting effect is achieved.

[0033] Example 2: Reference Figure 2 The implementation method is substantially the same as that of Example 1, the main difference being the way in which the second light-transmitting adhesive layer 5 covers the first light-transmitting adhesive layer 3, and a cavity structure 6 is provided between the first light-transmitting adhesive layer 3 and the second light-transmitting adhesive layer 5, and the two are arranged at intervals. The cavity structure 6 can be used for light propagation, and by setting different refractive indices for the first light-transmitting adhesive layer 3, the second light-transmitting adhesive layer 5 and the cavity structure 6, a preset light refraction effect can be achieved.

[0034] The present invention is not limited thereto; any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A light source device, characterized in that: include: Bracket (1); A light-emitting chip (2), which is arranged in the bracket (1); A first light-transmitting adhesive layer (3), which covers the front and side surfaces of the light-emitting chip (2); A highly reflective adhesive layer (4) is arranged on the periphery of the first light-transmitting adhesive layer (3) and inside the bracket (1); the interface between the first light-transmitting adhesive layer (3) and the highly reflective adhesive layer (4) is arranged as a reflective surface (41) which is at a certain angle to the front surface of the light-emitting chip (2), and the reflective surface (41) is used to reflect the light emitted from the side surface of the light-emitting chip (2) to the front surface; A second light-transmitting adhesive layer (5) is arranged above the high-reflective adhesive layer (4) and completely covers the first light-transmitting adhesive layer (3), and the second light-transmitting adhesive layer (5) is used to optimize, shape or change the color of the light beam.

2. The light source device according to claim 1, characterized in that: The first light-transmitting adhesive layer (3) and the second light-transmitting adhesive layer (5) are tightly attached to each other, or a cavity structure (6) is provided between the first light-transmitting adhesive layer (3) and the second light-transmitting adhesive layer (5).

3. The light source device according to claim 1, characterized in that: The second light-transmitting adhesive layer (5) is configured as a light-transmitting medium comprising at least fluorescent powder.

4. The light source device according to claim 1, characterized in that: The cross section of the reflective surface (41) tapers gradually from the front surface of the light-emitting chip (2) toward the bottom surface of the light-emitting chip (2).

5. The light source device according to claim 1, characterized in that: The reflection surface (41) is configured as a flat surface or a curved surface.

6. The light source device according to claim 1, characterized in that: The front surface of the first light-transmitting adhesive layer (3) is a flat surface or a slightly curved surface.

7. The light source device according to claim 1, characterized in that: The light-emitting surface (51) of the second light-transmitting adhesive layer (5) is arranged as a plane or a free-form surface.

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