With the rapid development of the LED industry in recent years, the LED lens industry is also booming. There are many entrepreneurs and related people engaged in LED optical lenses who have a certain understanding and superb technology of LED optical lenses, so I would like to explain to you below. Some content about the reflection and refraction of LED lens, welcome to read!
The LED lens is generally a plastic lens, because the plastic has high temperature resistance (it can also be reflowed), so it is often directly packaged on the LED chip. Generally, silicone lenses are small in size, 3-10mm in diameter. And the LED lens is generally closely related to the LED, which helps to improve the light output efficiency of the LED, and the lens changes the optical system of the light field distribution of the LED.
Compared with traditional light sources, LED light sources have many advantages, which has become a consensus, but LED chips are small in size and compact in structure, and their light-emitting area is relatively small. It is a Lambertian light source with a 180-degree angle. The light intensity distribution is proportional to the cosine of the light exit angle, that is, the illuminance formed by the light emitted by the LED light source on the illuminated surface decreases rapidly with the increase of the exit angle. Obviously, such light source characteristics are difficult to meet the actual needs of outdoor lighting applications. Therefore, in the application of LED outdoor lighting, we must carry out secondary optical design according to the characteristics of the LED light source according to different applications and needs, so as to realize the shaping and change of the light emitted by the LED chip, especially the light intensity distribution. Such a secondary optical design process actually belongs to the category of non-imaging optical design.
In the non-imaging optical design of LED lighting system, the basic optical components are mainly lenses, aspherical mirrors and refractive plates. The lens can make the light emitted by the point light source converge or diverge, and play the role of changing the size of the beam angle, so as to achieve the purpose of changing the illumination area and illuminance value of the illuminated surface. The shape of aspherical mirrors is usually a rotating quadratic surface, and its working principle is completely different from that of lenses and mirrors. Lenses use the principle of refraction, and mirrors use the principle of reflection or total reflection. Their aperture angles are generally below 40 degrees. The aperture angle of the aspherical reflector can reach more than 130 degrees, that is, its ability to collect light can be greatly enhanced.
As for the main function of the reflector, it is to change the outgoing direction of the light or change the angle of the beam in a specific direction. In fact, it is the peripheral plastic panel of the common and familiar LED light source system. This plastic panel is classified according to its structure. Each tooth of the tooth-shaped refractor plate is equivalent to a wedge-shaped mirror, and its surface refraction can deflect the light, but it will not change the size of the beam angle, and it mainly plays the role of changing the beam exit direction. The trapezoidal refractive plate is equivalent to the combination of flat glass and wedge mirror. It can divide a beam of light into three directions, and the light intensity ratio of the beam in the three directions is controlled by the area ratio of its plane and inclined plane. Cylindrical refractive plate, also known as fly eye lens, is composed of a series of cylindrical surfaces, each of which is equivalent to a lens. , the function of the lens makes convergence or divergence in all directions, so as to achieve the purpose of expanding the beam angle.
That's all for today, thank you for your patience in reading!
Xiangshun Optics (www.ledlensxs.com) has a dedicated optical design department, and has independently developed and designed a variety of lenses, including LED street light lenses, magnetic line light lenses, flashlight lenses, downlight lenses, cob holder, VR projection lens etc. Imported raw materials for optical grade, in line with environmental protection requirements, to meet the needs of offices, enterprises, roads, factories, homes and other occasions.
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