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  • Wuxi Kinglux Glass Lens Co.Ltd
  • ADD:No.286,Changjiang North Rd,New Dist,Wuxi,JS prov,China
  • Tel: 86-510-66759801
  • Fax: 86-510-84602998
  • Mobile phone: 86-18168862789
  • E-mail: ledglasslens@163.com
  • Contact person: Huimin Zhang
  • Talking about the lens design of LED crystal light source
    Nov 09, 2018

    [Introduction] The incident surface at the top of the inner cone chamber is a convex arc surface, which can diverge the light incident from the incident surface; the entrance surface of the sidewall is a revolving plane having a certain inclination from the bottom to the top, which can Light incident from the incident surface diverges.


    At present, the crystal light source is mainly incandescent or halogen bulb, which has the advantage of large illumination angle, but the crystal lamp usually needs 10-20 light sources, and even more, and consumes a large amount of electricity. Only when the crystal light source realizes a large illumination angle, the surrounding crystal can be brightened, showing a crystal clear optical effect and achieving a decorative effect. In actual use, a light source with an illumination angle of about 250° can basically meet the requirements.



    Due to the advantages of high luminous efficiency and low loss, LEDs have successively introduced LED light source crystal lamps, but the LED light intensity is distributed in Lambertian, and the light exit angle is 110°-130°. To achieve an exit angle of more than 250°, it must be carried out. Secondary optical design. At present, most LED crystal lamps have an illumination angle of only 60°-160°. By using a secondary optical lens and a common LED, an exit angle of about 250° can be achieved. The design principle is as follows:


    The top of the lens is designed as a concave free-form curved surface, the outer side of the outer contour is an arc exit surface, and the bottom is the entrance surface of the cone-shaped circular cavity. The light is emitted from the LED light source and is incident from the inner cone of the lens at the bottom of the lens. A part of the light is incident on the concave free surface at the top of the lens. A small amount of light is directly reflected and emitted. Most of the light is reflected to the side of the outer contour and is refracted, and the other part of the light is reflected. Directly reflected from the side of the outer contour.


    The top incident surface of the inner cone circular table cavity is a convex curved surface, which can diverge the light incident from the incident surface; the sidewall incident surface is a rotating surface which gradually tapers from bottom to top and has a certain inclination, which can be incident from the incident surface The incident light is diverging.


    The concave free-form surface of the lens is concave and is formed by the Snell's law. The light incident from the bottom of the lens is totally reflected at the free surface, and the small-angle light is reflected to the side of the lens to increase the angle of the lens. Compared with the specular reflection. Specular reflection loss can be effectively avoided. The side of the outer contour gradually retracts from bottom to top, which increases the exit angle of the exiting light from the side.


    The bottom of the lens is designed with a screw thread that can be tightly connected to the heat sink for easy and reasonable assembly. At the same time, after the lens is screwed with the heat sink, the PCB can be pressed against the plane of the lower end surface of the lens screw to reduce the gap between the PCB board and the heat sink and the heat conductive silicone, thereby eliminating the problem of fixing the PCB board and the heat sink. While achieving the optical requirements, the connection and heat dissipation of the luminaires are rationally designed.


    The design of a crystal light source lens using the principle of free-form surface enables the LED to replace the traditional light source such as incandescent lamp and halogen lamp to be applied to the crystal lamp. The performance of the LED single lamp is stable, and the system life and reliability are higher.