An LED lens with multi-functional light distribution

Abstract

The present invention discloses an LED lens with multi-functional light distribution, which includes an outer curved surface, an inner curved surface and a concave cavity. The outer curved surface is a smooth surface and constitutes the light-emitting surface. The inner curved surface is the incident surface, and the LED light source is placed in the concave cavity to form a light source cavity. The LED lens is divided into four quadrants. The first quadrant is for specific area lighting, the second quadrant is for ambient lighting, and the third and fourth quadrants are for road lighting. The outgoing light direction of the specific area lighting is consistent with the vehicle driving direction. Pleats are sequentially spliced on the incident surfaces of the road lighting and the specific area lighting, and the light distribution curve is adjusted by adjusting parameters such as the length and angle of the pleats to achieve the required light distribution. The present invention provides an LED lens with multi-functional light distribution. Designed in modules according to different requirements, it can not only achieve large-area road lighting, but also perform specific area lighting for moving vehicles, and can also use a part of the light for spatial environment lighting, realizing the effect of multiple light distribution uses of one lens.

Description

Technical Field

[0001] The present invention belongs to the technical field of LED lenses, and specifically refers to an LED lens with multi-functional light distribution. Background Art

[0002] Traditional road lighting usually uses lamp posts with a height of 10 - 12 meters and a spacing of 20 meters for medium and high pole lighting. This lighting method has the following disadvantages: ① The gradient distribution of illuminance is unreasonable, resulting in ineffective lighting. Drivers are concerned about the road surface, and the less they pay attention as they go higher. However, the medium and high pole lighting method is exactly the opposite, being brighter as it goes higher and darker towards the ground; ② The lighting area is not reasonable enough. For highways, there are some areas that do not require lighting but are still lit. In view of this, low-level lighting technology came into being.

[0003] The main feature of low-level lighting is that the installation height is lower than the height of the driver's eyes. According to the regulations of CNE, the height of the driver's eyes is approximately 1.4 - 1.5 meters, that is, the installation height of low-level lighting is lower than 1.4 meters. For low-level lighting, to achieve road functional lighting, there are relatively high requirements for the light distribution of the lamps, meeting the requirements of the road surface brightness, overall brightness uniformity U0, longitudinal brightness uniformity UI, and glare threshold TI. However, currently used low-level lighting lamps generally have problems such as overly concentrated irradiation light and too small an irradiation area, with a short irradiation distance, making the middle part of the road darker and affecting the driver's line of sight. Currently, more low-level lighting lamps are installed on the road to solve the problem, but this not only wastes power but also increases management costs. And currently, the light distribution design of low-level lighting is only for road lighting, without a specific light distribution for irradiating moving vehicles. It is very difficult for drivers to observe the license plate and other information of the vehicle in front, greatly increasing the potential safety hazards during driving. Summary of the Invention

[0004] In order to solve the technical problems of the existing low-level lighting with a small irradiation area, short irradiation distance, and no specific area lighting for vehicles, the present invention proposes an LED lens with multi-functional light distribution, which can meet the large-area lighting of the road while taking into account the spatial environment lighting and specific area lighting, achieving the effect of multiple light distribution uses for one lens.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a multifunctional light-distributing LED lens, including an outer curved surface, an inner curved surface and a concave cavity. The outer curved surface is a smooth surface, constituting the light-emitting surface 1. The inner curved surface is the incident surface 2. The LED light source is placed in the concave cavity, constituting the light source cavity 3. The LED lens is divided into four quadrants. The first quadrant is for specific area lighting, the second quadrant is for ambient lighting, and the third and fourth quadrants are for road lighting. The outgoing light direction of the specific area lighting is consistent with the vehicle driving direction. The light-emitting surface 1 includes a first light-emitting surface 11, a second light-emitting surface 12 and a third light-emitting surface 13. The incident surface 2 includes a first incident surface 21, a second incident surface 22 and a third incident surface 23. The first light-emitting surface 11 and the first incident surface 21 are the light-emitting surface and the incident surface for specific area lighting. The second light-emitting surface 12 and the second incident surface 22 are the light-emitting surface and the incident surface for ambient lighting. The third light-emitting surface 13 and the third incident surface 23 are the light-emitting surface and the incident surface for road lighting. The second incident surface 22 is a smooth curved surface. The first incident surface 21 and the third incident surface 23 are both provided with wrinkles 24 spliced in sequence. The wrinkles 24 include a cross-section 241 and a light-distributing surface 242. The cross-section 241 and the light-distributing surface 242 are connected. By adjusting parameters such as the curvature, length, and angle of the light-distributing surface 242, the light-distribution curve is adjusted to achieve the required light distribution.

[0006] Preferably, the multifunctional light-distributing LED lens is a hollow hemisphere or a hollow semi-ellipsoid or other suitable shapes, which can be completely fitted to the surface of the guardrail tube without damaging the landscape, integrity and harmony of the original circular guardrail tube, and is beautiful and generous.

[0007] Preferably, the surface of the second light-emitting surface 12 is a frosted surface, and the upward space ambient lighting light is softer and not dazzling, reducing the contrast between road lighting and space ambient lighting and improving the visual comfort of drivers.

[0008] Preferably, the first light-emitting surface 11 and the third light-emitting surface 13 are smooth curved surfaces, which improve the light transmittance of the light source and are used for large-area road lighting, effectively utilizing the light energy.

[0009] Preferably, the LED light source is placed at the center of the bottom surface of the light source cavity 3. The LED light sources are arranged in a rectangular shape, and the number of LED light sources is at least 1, and the outgoing light irradiation is more uniform.

[0010] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0011] A multifunctional light - distribution LED lens provided by the present invention is vertically installed on one side of the road. The lens is divided into four quadrants with separate light - distribution designs. The first quadrant is for specific - area lighting, and its light - emitting direction is the same as the vehicle - driving direction, used to illuminate the driving vehicles, facilitating the driver to observe the license plates and other information of the vehicles in front, and can avoid strong light directly entering the human eyes to the greatest extent, greatly improving driving safety. The second quadrant is for ambient lighting, with a Lambertian light - distribution. The emitted light diffuses in all directions, and the second light - emitting surface is a frosted surface, making the upward - directed ambient - lighting light softer and not dazzling, reducing the contrast between road lighting and ambient - space lighting, and improving the visual comfort of drivers. The third and fourth quadrants are for road lighting, adopting a segmented light - distribution design with precise light - distribution, projecting more light onto road lighting to achieve large - area road lighting.

[0012] A multifunctional light - distribution LED lens provided by the present invention is designed in modules according to different lighting requirements. It can not only achieve large - area road lighting, but also provide specific - area lighting for driving vehicles, greatly improving driving safety. It can also use a part of the light for upward ambient - space lighting, reducing the contrast between road lighting and ambient - space lighting, and improving the visual comfort of drivers, achieving the effect of multiple light - distribution uses with one lens.

[0013] The multifunctional light - distribution LED lens provided by the present invention is in the shape of a solid or hollow semi - ellipsoid or other suitable shapes, and can be completely attached to the surface of the guardrail tube without damaging the landscape, integrity and harmony of the original circular guardrail tube, being beautiful and generous.

[0014] The multifunctional light - distribution LED lens provided by the present invention has a smooth light - emitting surface, which is not easy to hide dust and is easy to clean. Natural wind and rain can achieve a certain cleaning effect, reducing manual operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three - dimensional view of a multifunctional light - distribution LED lens.

[0016] Figure 2 It is a light - ray tracing diagram of a multifunctional light - distribution LED lens.

[0017] Figure 3 It is a light - distribution curve diagram of a multifunctional light - distribution LED lens.

[0018] Reference numerals in the drawings: 1, light - emitting surface; 11, first light - emitting surface; 12, second light - emitting surface; 13, third light - emitting surface; 2, incident surface; 21, first incident surface; 22, second incident surface; 23, third incident surface; 24, fold; 241, cross - section; 242, light - distribution surface; 3, light - source cavity. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following will be further described in conjunction with the accompanying drawings and specific embodiments.

[0020] See the attached Figure 1 , a multi-functional light-distributing LED lens, including an outer curved surface, an inner curved surface and a concave cavity. The outer curved surface is a smooth surface, constituting the light-emitting surface 1. The inner curved surface is the incident surface 2. The LED light source is placed in the concave cavity, constituting the light source cavity 3. The LED lens is divided into four quadrants. The first quadrant is for specific area illumination, the second quadrant is for ambient illumination, and the third and fourth quadrants are for road illumination. The outgoing light direction of the specific area illumination is consistent with the vehicle driving direction. The light-emitting surface 1 includes a first light-emitting surface 11, a second light-emitting surface 12 and a third light-emitting surface 13. The incident surface 2 includes a first incident surface 21, a second incident surface 22 and a third incident surface 23. The first light-emitting surface 11 and the first incident surface 21 are the light-emitting surface and the incident surface for specific area illumination. The second light-emitting surface 12 and the second incident surface 22 are the light-emitting surface and the incident surface for ambient illumination. The third light-emitting surface 13 and the third incident surface 23 are the light-emitting surface and the incident surface for road illumination. The second incident surface 22 is a smooth curved surface. The first incident surface 21 and the third incident surface 23 are both provided with folds 24 spliced in sequence. The fold 24 includes a cross-section 241 and a light-distributing surface 242. The cross-section 241 and the light-distributing surface 242 are connected. By adjusting parameters such as the curvature, length, and angle of the light-distributing surface 242, the light-distribution curve is adjusted to achieve the required light distribution.

[0021] Furthermore, the multi-functional light-distributing LED lens is a hollow hemisphere or a hollow semi-ellipsoid or other suitable shapes, which can be completely attached to the surface of the guardrail tube without damaging the landscape, integrity and harmony of the original circular guardrail tube, and is beautiful and generous.

[0022] Furthermore, the surface of the second light-emitting surface 12 is a frosted surface, and the upward space ambient illumination light is softer and not dazzling, reducing the contrast between road surface illumination and space ambient illumination and improving the visual comfort of drivers.

[0023] Furthermore, the first light-emitting surface 11 and the third light-emitting surface 13 are smooth curved surfaces, improving the light transmittance of the light source and being used for large-area road illumination to effectively utilize light energy.

[0024] Furthermore, the LED light source is placed at the center of the bottom surface of the light source cavity 3. The LED light sources are arranged in a rectangular shape, and the number of LED light sources is at least 1, and the outgoing light irradiation is more uniform.

[0025] Place the LED point light source at the center of the bottom surface of the lens light source cavity 3, and use TracePro software to perform ray tracing on the system to obtain the ray tracing diagram and the light distribution curve diagram of the lens, as shown in the attached Figure 2 and the attached Figure 3 . Take the lamp post erection direction as the z-axis direction and the lamp installation direction as the x-axis direction.Figure 2 In the figure, the upper part of the light is the light emitted through the first light emitting surface 11 and the second light emitting surface 12, which are used for ambient lighting and specific area lighting respectively. The light of ambient lighting is weaker and the light intensity is smaller, which can minimize the intensity of glare, reduce the contrast between road lighting and spatial ambient lighting, and improve the visual comfort of drivers; the light of specific area lighting is stronger and the light intensity is larger. Its light emission direction is consistent with the direction of vehicle travel, which is used to illuminate moving vehicles, making it convenient for drivers to observe the license plate and other information of the vehicle in front, and can minimize the strong light from directly entering the human eye, greatly improving driving safety. The lower part of the light is the light emitted through the second light emitting surface 13, which is used to illuminate the road. The effects of road lighting and specific area lighting can be achieved by adjusting the length and position of each fold in the 3rd, 4th and 1st quadrant lenses.

[0026] The above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many similar modifications are possible. All modifications that can be directly derived or associated with the contents disclosed by a person skilled in the art should be considered as the scope of protection of the present invention.

Claims

1. An LED lens with multi-functional light distribution, comprising an outer curved surface, an inner curved surface and a concave cavity. The outer curved surface is a smooth surface, forming the light-emitting surface (1), the inner curved surface is the incident surface (2), and the LED light source is placed in the concave cavity, forming the light source cavity (3). It is characterized in that: The LED lens is divided into four quadrants. The first quadrant is for specific area lighting, the second quadrant is for ambient lighting with a Lambertian light distribution where the emitted light spreads around, and the third and fourth quadrants are for road lighting. The emitted light direction of the specific area lighting is consistent with the vehicle driving direction; the light-emitting surface (1) includes a first light-emitting surface (11), a second light-emitting surface (12), and a third light-emitting surface (13), and the incident surface (2) includes a first incident surface (21), a second incident surface (22), and a third incident surface (23); the first light-emitting surface (11) and the first incident surface (21) are the light-emitting surface and the incident surface for specific area lighting, the second light-emitting surface (12) and the second incident surface (22) are the light-emitting surface and the incident surface for ambient lighting, and the third light-emitting surface (13) and the third incident surface (23) are the light-emitting surface and the incident surface for road lighting; the second incident surface (22) is a smooth curved surface, and wrinkles (24) are sequentially spliced on the first incident surface (21) and the third incident surface (23). The wrinkles (24) include a cross-section (241) and a light distribution surface (242), and the cross-section (241) is connected to the light distribution surface (242). The light distribution curve is adjusted by adjusting the light distribution surface (242); the surface of the second light-emitting surface (12) is a frosted surface, and the first light-emitting surface (11) and the third light-emitting surface (13) are smooth curved surfaces.

2. The multifunctional light-distributing LED lens according to claim 1, wherein: The LED lens with multi-functional light distribution is a hollow hemisphere or a hollow semi-ellipsoid.

3. The multifunctional light-distributing LED lens according to claim 1, characterized in that: The LED light sources in the light source cavity (3) are arranged in a rectangle, and the number of LED light sources is at least 1. The LED light sources are placed at the center of the bottom surface of the light source cavity (3).

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