LED light source device

Abstract

The utility model relates to the technical field of semiconductor light emitting, and discloses an LED light source device which comprises a substrate, a light emitting chip, a first lens, a second lens and a cavity structure. The light-emitting chip is arranged on the substrate. The first lens at least covers the upper surface of the light-emitting chip. The second lens is arranged above the first lens. The cavity structure is arranged between the second lens and the substrate. The incident plane of the second lens is provided with a first optical interface recessed towards the interior of the second lens. The emergent face of the first lens comprises a second optical interface in the middle and a third optical interface on the periphery. The second optical interface extends into the recessed cavity structure below the first optical interface. The LED light source device is provided with the concave first optical interface, and the second optical interface extends into the concave cavity structure below the first optical interface, so that the size of the LED light source device is reduced, the divergence angle of emergent light in the area is enlarged, and the light distribution is more uniform; partitioned precise light control is achieved, and the service life of the product is long.

Description

Technical Field

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

[0002] Semiconductor light-emitting devices are widely used in various lighting equipment, especially in various electronic devices, because of their advantages such as small size, low power consumption, long service life, and high brightness. LED light source is one of the common semiconductor light sources. The natural light emitted by LED light source has a Lambertian distribution, with the strongest energy in the center and gradually weakening around. The energy is not concentrated, the remote light spot is large, and the light energy is wasted, which cannot meet the needs of application scenarios.

[0003] In order to control the light output angle of the LED light source, the LED light source of the prior art refers to Figure 4 A light emitting chip 2 is arranged on a substrate 1, a first lens 3 is coated on the light emitting chip 2, and a second lens 4 is arranged above the first lens 3. A cavity structure 5 is arranged between the second lens 4 and the substrate 1, and the first optical lens 3 is arranged in the cavity structure 5 and is spaced apart from the second lens 4. The light emitting angle of the light emitting chip 2 is controlled by utilizing the principle of refraction of light propagating through the first lens 3, the cavity structure 5 and the second lens 4 with different refractive indices.

[0004] The problem with the prior art is that the LED light source uses a double-layer lens setting, which is relatively large in size, and the light-emitting chip 2 is relatively far away from the second lens 4, so that the divergence angle range of the middle part of the LED light source is small, so the brightness of the middle part is high and the light emission is uneven.

[0005] Based on the above, the problem to be solved at present is: to provide an LED light source device with precise light control in different zones, uniform light emission, small size and long life. Utility Model Content

[0006] The utility model aims to provide an LED light source device, aiming to solve the problems in the prior art that the double-layer lens structure has a large volume, a small angle range of divergent light, and a poor heat conduction effect.

[0007] The utility model is an LED light source device implemented in this way, comprising:

[0008] substrate;

[0009] a light emitting chip disposed on the substrate;

[0010] a first lens covering at least the upper surface of the light emitting chip;

[0011] a second lens disposed above the first lens;

[0012] a cavity structure disposed between the second lens and the substrate;

[0013] The exit surface of the first lens is spaced apart from the incident surface of the second lens; the incident surface of the second lens is provided with a first optical interface recessed toward the interior of the second lens; the exit surface of the first lens includes a second optical interface in the middle and third optical interfaces around it, and the second optical interface extends into a recessed cavity structure below the first optical interface.

[0014] Furthermore, the refractive index of the first lens is smaller than the refractive index of the second lens.

[0015] Furthermore, the first lens and / or the second lens is a convex lens.

[0016] Furthermore, the exit surface is a convex surface.

[0017] Furthermore, the outer surface of the second lens is a second exit surface, and the second exit surface is a plane or a free-form surface.

[0018] Compared with the prior art, the LED light source device provided by the utility model has the following beneficial effects:

[0019] The utility model is provided with a concave first optical interface 411 on the incident surface 41 of the second lens 4, and the second optical interface 311 extends into the concave cavity structure 5 below the first optical interface 411. The arrangement 1. adds a space for accommodating the second optical interface 311, thereby reducing the volume of the LED light source; 2. within one focal length of the second lens 4, the closer the light emitting chip 2 is to the second lens 4, the larger the divergence angle range of the local (middle) part is, so that the brighter light in the middle part is refracted to the surroundings, making the brightness of the local (middle) part more uniform, and the light of the edges around the edges converges to the center, with high energy utilization. Figure 3 ; 3. The different settings of the incident surface 41 corresponding to the second optical interface 311 and the third optical interface 312 realize partitioning and local light control, the light distribution is more uniform, and the overall light control effect is good; 4. The exit surface 31 and the incident surface 41 are spaced apart, and air is usually provided at the interval, which can effectively conduct heat to the air at the interval, thereby reducing the heat conducted to the second lens 4 and extending the life of the second lens 4. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of the LED light source device provided by the utility model;

[0021] Figure 2 It is a schematic cross-sectional structure diagram of another LED light source device provided by the utility model;

[0022] Figure 3This is a light path diagram of the LED light source device provided by the utility model;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of an LED light source device in the prior art.

[0024] In the figure: 1-substrate; 2-light-emitting chip; 3-first lens; 31-exit surface; 311-second optical interface; 312-third optical interface; 4-second lens; 41-incident surface; 411-first optical interface; 42-second exit surface; 5-cavity structure; 6-gold wire. DETAILED DESCRIPTION

[0025] 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.

[0026] The implementation of the present utility model 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 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.

[0028] Reference Figure 1-3 As shown, it is a preferred embodiment provided by the utility model.

[0029] The LED light source device includes a substrate 1, a light emitting chip 2, a first lens 3, a second lens 4 and a cavity structure 5. Figure 1. The light-emitting chip 2 is fixed on the substrate 1. The first lens 3 covers at least the upper surface of the light-emitting chip 2, and can be set so that the first lens 3 covers the upper surface of the light-emitting chip 2 or covers the upper surface and the side of the light-emitting chip 2. The second lens 4 is arranged above the first lens 3 and covers the first lens 3. The bottom of the second lens 4 is connected to the substrate 1. A cavity structure 5 is also provided between the second lens 4 and the substrate 1. The cavity structure 5 is used for light propagation. The cavity structure 5 can be filled with gas, liquid or solid, preferably with air. The light-emitting chip 2 and the first lens 3 are arranged in the cavity structure 5. The refractive indexes of the cavity structure 5, the first lens 3 and the second lens 4 increase successively. The angle of the light emitted by the light-emitting chip 2 is controlled by utilizing the principle of refraction of light when propagating in adjacent media with different refractive indices.

[0030] The exit surface 31 of the first lens 3 is spaced from the incident surface 41 of the second lens 4, so that the heat generated by the first lens 3 will not be directly transferred to the second lens 4, and the second lens 4 is not easily brittle. The incident surface 41 of the second lens 4 is provided with a first optical interface 411 which is recessed toward the inside of the second lens 4. The first optical interface 411 surrounds a recessed accommodation area in the cavity structure 5, which is used to accommodate part of the exit surface 31 of the first lens 3. The exit surface 31 of the first lens 3 includes a second optical interface 311 in the middle and a third optical interface 312 around it. The second optical interface 311 extends into the recessed cavity structure 5 below the first optical interface 411.

[0031] The second optical interface 311 extends into the cavity structure 5 below the first optical interface 411. The second optical interface 311 in the middle of the exit surface 31 of the first lens 3 and the third optical interface 312 around it are configured differently (refer to Figure 3 ): 1. Realize zoned light control, the light divergence angle in the middle is increased, the energy distribution is more uniform, the light at the edges around converges to the center, and the energy utilization rate is high; 2. The overall volume of the light source can be reduced; 3. The light-emitting chip 2 is closer to the second lens 4, and the divergence angle of the local (middle) emergent light is larger, so that the uniformity of the central light field is better; 4. A gap is set between the second optical interface 311 and the first optical interface 411 to extend the service life of the second lens 4.

[0032] Preferably, the first optical interface 411 can be set as a plane or a free-form surface, preferably a micro-arc surface. Figure 1 , the first optical interface 411 is a free-form surface and is directly connected to the incident surfaces 41 on all sides; Figure 2 The first optical interface 411 is a free-form surface, which is connected to the incident surfaces 41 on all sides through vertical planes.

[0033] Further, the first lens 3 and / or the second lens 4 is a convex lens. The light emitting chip 2 is within one focal length of the second lens 4. The closer the light emitting chip 2 is to the second lens 4, the greater the divergence angle of the light emitted by the second lens 4. The exit surface 31 of the first lens 3 is preferably a convex surface. The outer surface of the second lens 4 is the second exit surface 42, and the second exit surface 42 is preferably a convex surface.

[0034] The LED light source device is also provided with a gold wire 6 for electrically connecting the substrate 1 and the light-emitting chip 2. The gold wire 6 is arranged in the cavity structure 5. One end of the gold wire 6 extends into the first lens 3 and is connected to the light-emitting chip 2, and the other end is connected to the substrate 1.

[0035] This does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED light source device, characterized in that: include: substrate(1); A light-emitting chip (2) disposed on the substrate (1); A first lens (3) at least covering the upper surface of the light-emitting chip (2); a second lens (4) disposed above the first lens (3); A cavity structure (5) provided between the second lens (4) and the substrate (1); The exit surface (31) of the first lens (3) and the incident surface (41) of the second lens (4) are arranged at intervals; the incident surface (41) of the second lens (4) is provided with a first optical interface (411) recessed toward the interior of the second lens (4); the exit surface (31) of the first lens (3) comprises a second optical interface (311) in the middle and third optical interfaces (312) on the periphery, and the second optical interface (311) extends into a recessed cavity structure (5) below the first optical interface (411).

2. The LED light source device according to claim 1, characterized in that: The refractive index of the first lens (3) is smaller than the refractive index of the second lens (4).

3. The LED light source device according to claim 1, characterized in that: The first lens (3) and / or the second lens (4) is a convex lens.

4. The LED light source device according to claim 1 or 3, characterized in that: The exit surface (31) is a convex surface.

5. The LED light source device according to claim 1 or 3, characterized in that: The outer surface of the second lens (4) is a second exit surface (42), and the second exit surface (42) is a plane or a free-form surface.

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