LED light source device
By adopting a bilayer lens structure with different refractive indexes and a reflection surface design in the LED light source device, the problems of large light energy loss and large volume are solved, and an efficient utilization of light energy and miniaturization of LED light source devices are achieved.
Patent Information
- Application Number
- CN202410096660.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-24
- Publication Date
- 2025-07-29
AI Technical Summary
The existing LED light source devices have problems of large energy loss and large volume, especially the total reflection of light at a large divergence angle in the lens, resulting in light energy loss, and the light energy utilization rate is low.
A bilayer lens structure is adopted, wherein the refractive index of the first lens is smaller than that of the second lens, the exit surface of the first lens is connected to the incident surface of the second lens, the incident surface of the second lens is arranged at intervals between the incident surface of the second lens, and the light control is performed using the refractive principle of different refractive index media, and the surrounding sides of the first lens are arranged as the reflection surface of large-angle light at the reflecting edge.
The light energy utilization rate has been improved, the light source volume is reduced, the brightness is improved, the light shaping effect is good, the light control is accurate, and the light energy loss is reduced.
Smart Images
Figure CN120390495A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of semiconductor lighting, and more particularly, 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 volume, low power consumption, long service life, and high brightness. The LED light source is one of the common semiconductor light sources. The natural light emitted by the LED light source presents a Lambert distribution, with the energy being the strongest at the center and gradually decreasing towards the periphery. The energy is not concentrated, the remote light spot is relatively large, and there is a waste of light energy, which cannot meet the needs of the application scenario. [[ID=,10]]
[0003] To control the light-emitting angle of the LED light source, in the existing LED light source technology, refer to Figure 2 , a light-emitting chip 2 is disposed on a substrate 1, a first lens 3 is coated on the light-emitting chip 2, and a second lens 4 is disposed above the first lens 3. A cavity structure 5 is provided between the second lens 4 and the substrate 1, and the first optical lens 3 is disposed in the cavity structure 5 and is spaced apart from the second lens 4. By using the principle of refraction of light when propagating in the first lens 3, the cavity structure 5, and the second lens 4 with different refractive indices, the light-emitting angle of the light-emitting chip 2 is controlled.
[0004] Problems existing in the prior art: When light is incident from the first lens 3 to the cavity structure 5, refer to Figure 3 , for the propagation from an optically denser medium to an optically thinner medium, part of the light will undergo total internal reflection in the first lens 3. The light with a larger emission angle is more likely to undergo total internal reflection. Part of the light after total internal reflection is incident on the surface of the light-emitting chip 2 and is absorbed, resulting in a large energy loss of the light in the first lens 3 and low light efficiency. At the same time, the volume of the existing technology is relatively large.
[0005] Based on the above, the problems to be solved currently are: to provide an LED light source device with good light control effect, high light energy utilization rate, and small volume. Summary of the Invention
[0006] The purpose of the present invention is to provide an LED light source device, aiming to solve the problems of large energy loss and large volume in the prior art with a double-lens structure.
[0007] The LED light source device of the present invention is implemented as follows and includes:
[0008] A 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 first lens is disposed within the cavity structure. The exit surface of the first lens includes a first optical interface in the middle and a second optical interface around the periphery. The first optical interface is connected to the incident surface of the second lens, and the second optical interface is spaced from the incident surface of the second lens;
[0014] The refractive index of the first lens is less 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 peripheral side surfaces of the first lens are provided as reflecting surfaces for reflecting large-angle light at the edges.
[0017] Compared with the prior art, the LED light source device provided by the present invention has the following beneficial effects:
[0018] Refer to Figure 2-3 , for the light with a large divergence angle at the edge of the light-emitting chip 2 in the prior art, after being reflected by the peripheral side surfaces of the first lens 3, it reaches the interface between the middle of the exit surface 31 and the cavity structure 5. The refractive index of the cavity structure 5 is less than the refractive index of the first lens 3, that is, the light propagates from an optically denser medium to an optically thinner medium, and total internal reflection is likely to occur when the incident angle is large. After several total internal reflections, the light is incident on the upper surface of the light-emitting chip 2 and absorbed, resulting in large light energy loss.
[0019] Refer to Figure 1 , for the LED light source device provided by the present invention, the first optical interface 311 of the first lens 3 is connected to the incident surface 41 of the second lens 4, that is, the light incident on this connection area directly enters the second lens 4 from the first lens 3 without passing through the cavity structure 5. This setting has the following compared with the prior art: 1. The height of the LED light source device is reduced, and thus the volume is reduced; 2. The refractive index of the first lens 3 is less than the refractive index of the second lens 4. Refer to Figure 4 , when the large-angle light at the edge is reflected by the reflecting surface 32 and reaches the interface where the first optical interface 311 and the incident surface 41 are connected to each other, the light propagates from an optically thinner medium to an optically denser medium, and total internal reflection does not occur. The light can directly enter the second lens 4 through the first lens 3 and be utilized by the second lens 4, with small light energy loss, improved light efficiency, and a significant increase in brightness.
[0020] Meanwhile, the second optical interface 312 is spaced from the incident surface 41. Most of the light emitted from the light-emitting chip 2 around it is emitted after passing through the first lens 3, the cavity structure 5, and the second lens 4 in sequence. Since the refractive indices of the cavity structure 5, the first lens 3, and the second lens 4 increase in sequence, the principle of refraction of light when it propagates at the interface of different refractive index media is utilized to control the light emitted around, so as to achieve the effect of converging and shaping the edge light. The LED light source device of the present invention realizes zonal light control with precise light control, higher light energy utilization rate, and smaller volume of the LED light source device. Description of the Drawings
[0021] Figure 1 is a schematic cross-sectional structure diagram of the LED light source device provided by the present invention;
[0022] Figure 2 is a schematic cross-sectional structure diagram of the LED light source device of the prior art;
[0023] Figure 3 is an optical path diagram of the large divergence angle light at the edge of the LED light source device of the prior art;
[0024] Figure 4 is an optical path diagram of the large divergence angle light at the edge of the LED light source device provided by the present invention.
[0025] In the figure: 1 - substrate; 2 - light-emitting chip; 3 - first lens; 31 - exit surface; 311 - first optical interface; 312 - second optical interface; 32 - reflecting surface; 4 - second lens; 41 - incident surface; 42 - second exit surface; 5 - cavity structure; 6 - gold wire. Detailed Embodiments
[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to 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 used to limit the present invention.
[0027] The implementation of the present invention will be described in detail below with reference to specific embodiments.
[0028] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This 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 orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.
[0029] Referring to Figure 1-4 as shown, it is a preferred embodiment provided by the present invention.
[0030] The LED light source device includes a substrate 1, a light-emitting chip 2, a first lens 3 and a second lens 4. Referring to Figure 1 . The light-emitting chip 2 is fixed on the substrate 1. The first lens 3 at least covers the upper surface of the light-emitting chip 2, and can be set such that the first lens 3 covers the upper surface of the light-emitting chip 2 or covers the upper surface and the side surface of the light-emitting chip 2. The second lens 4 is disposed above the first lens 3 and covers the first lens 3. The bottom of the periphery of the second lens 4 is connected to the substrate 1. A cavity structure 5 is further provided between the second lens 4 and the substrate 1, and the cavity structure 5 is used for light propagation. The light-emitting chip 2 and the first lens 3 are disposed in the cavity structure 5. The refractive index of the medium (generally air) in the cavity structure 5 is less than that of the first lens 3 and the second lens 4. By using the principle that light refracts when propagating in adjacent media with different refractive indices, the angle of the light emitted by the light-emitting chip 2 is controlled. Preferably, the refractive indices of the cavity structure 5, the first lens 3, and the second lens 4 increase in sequence.
[0031] The exit surface 31 of the first lens 3 includes a first optical interface 311 in the middle and a second optical interface 312 around. The first optical interface 311 is connected to the incident surface 41 of the second lens 4. 1. The volume of the light source can be reduced as a whole; 2. The refractive index of the first lens 3 is less than that of the second lens 4. Referring to Figure 4 , when light enters the incident surface 41 from the mutually connected first optical interface 311, it belongs to light propagating from an optically thinner medium to an optically denser medium and total internal reflection will not occur. Light with a large divergence angle can directly enter the second lens 4 after being reflected by the first lens 3 and be utilized by the second lens 4, with small light energy loss, which can improve the light efficiency and greatly enhance the brightness. Referring to Figure 2 and Figure 3, light with a large divergence angle at the edge of the prior art reaches the interface between the middle of the exit surface 31 and the cavity structure 5 after being reflected by the peripheral side surfaces of the first lens 3. The refractive index of the cavity structure 5 is less than that of the first lens 3, and total internal reflection is likely to occur when the incident angle is large. After several total internal reflections by the first lens 3, the light is incident on the upper surface of the light-emitting chip 2 and absorbed, resulting in large light energy loss.
[0032] Meanwhile, the second optical interface 312 is spaced from the incident surface 41 of the second lens 4 to control the light emitted from the periphery of the light-emitting chip 2. Most of the light emitted from the periphery of the light chip 2 is emitted after passing through the first lens 3, the cavity structure 5, and the second lens 4 in sequence. Since the refractive indices of the cavity structure 5, the first lens 3, and the second lens 4 increase in sequence, the principle of refraction of light when propagating at the interface of different refractive index media is utilized to control the light emitted from the periphery to achieve the effect of converging the edge light. The LED light source device of the present invention realizes zonal light control with precise light control, higher light energy utilization rate, and smaller volume of the LED light source device.
[0033] Preferably, the first lens 3 and / or the second lens 4 is a convex lens
[0034] In a specific embodiment, the first lens 3 is a convex lens, and the first optical interface 311 is connected to the incident surface 41 of the second lens 4. The second optical interface 312 is spaced from the incident surface 41 of the second lens 4. The second optical interface 312 can be set as a convex curved surface. The second lens 4 can also be set as a convex lens. The second lens 4 further includes a second exit surface 42 for outputting light, and the second exit surface 42 can be set as a free-form surface or a plane. The light in the middle of the first lens 3 enters the second lens 4 after being refracted by the first optical interface 311, with small energy loss, and the light in the middle exits at a small angle with concentrated energy. The light around the first lens 3 is roughly divided into two parts for emission. One part of the light is emitted after being refracted by the first lens 3, the cavity structure 5, and the second lens 4, which is equivalent to being emitted after being refracted by three layers of lenses. Such a setting enables the emitted light to accurately reach the preset emission angle with good light control effect; the other part of the light with a large divergence angle enters the second lens 4 directly after being refracted by the first lens 3, which can improve the light emission brightness of the LED light source device and the light energy utilization rate. The entire LED light source device realizes zonal and precise light control, with high light energy utilization rate, high overall brightness, and good light shaping effect.
[0035] The natural light emitted by the light-emitting chip 2 presents a Lambertian distribution, with the energy being the strongest at the center and gradually decreasing towards the periphery. The light at large angles at the edge cannot be utilized, resulting in light energy loss. In view of the above, the peripheral side surfaces of the first lens 3 are provided with reflecting surfaces 32 for reflecting the light at large angles at the edge. The reflecting surfaces 32 can be set as planes or curved surfaces at a certain angle to the upper surface of the light-emitting chip 2, and the cross-sectional area surrounded by the peripheral reflecting surfaces 32 gradually increases in the direction away from the light-emitting chip 2. The reflecting surface 32 is the interface between the first lens 3 and the cavity structure 5. When the light at large angles at the edge is incident on the reflecting surface 32, total internal reflection is likely to occur as it is incident from an optically denser medium to an optically rarer medium. After total internal reflection occurs, the light at large angles at the edge will propagate towards the optical axis direction, improving the light energy utilization rate.
[0036] The LED light source device further includes a gold wire 6 for electrically connecting the substrate 1 and the light-emitting chip 2. The gold wire 6 is disposed in the cavity structure 5 and extends at one end into the first lens 3 to be connected to the light-emitting chip 2.
[0037] The present invention is not limited thereto. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
Claims
1. An LED light source device, characterized in that, Comprising: A 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) disposed between the second lens (4) and the substrate (1); The first lens (3) is disposed within the cavity structure (5), and the exit surface (31) of the first lens (3) includes a first optical interface (311) in the middle and a second optical interface (312) around the periphery; the first optical interface (311) is connected to the incident surface (41) of the second lens (4), and the second optical interface (312) is spaced from the incident surface (41) of the second lens (4); The refractive index of the first lens (3) is less than the refractive index of the second lens (4).
2. 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.
3. The LED light source device according to claim 1, wherein, The peripheral side surface of the first lens (3) is provided as a reflecting surface (32) for reflecting large-angle light at the edge.