Lens group and light source device using same

Abstract

A lens group comprises a lens and a micro lens group matched with the lens. The lens comprises a light incoming face and a light outgoing face opposite to the light incoming face. The lens is provided with a central shaft. The light incoming face and the light outgoing face of the lens are respectively symmetrical relative to the central shaft. The micro lens group is arranged on the light outgoing face of the lens. The micro lens group comprises a plurality of annular micro lens units which are arranged on the light outgoing face of the lens in a circle by circle manner. Each annular micro lens unit comprises a first scattering face and a second scattering face connecting with the first scattering face. The first scattering face and the second scattering face of each annular micro lens unit are inclined relative to the central shaft of the lens. The lens group has the advantages that the micro lens group is disposed on the light outgoing face of the lens, light of areas near the optical axis of an LED light source is scattered out of the lens group by the micro lens units and is transmitted in various directions, optical field central area energy is lowered, and optical field central bright spots are eliminated. The invention further relates to a light source device using the lens group.

Description

technical field [0001] The invention relates to a lens group and a light source device using the lens group. Background technique [0002] Light emitting diode (light emitting diode, LED), as an efficient light source, has many characteristics such as environmental protection, power saving, and long life, and has been widely used in various fields, especially the field of backlighting. In the field of backlighting, in order to uniform the light, the LED light source is usually used with a diffusion lens, so that the light of the LED light source can be emitted at a larger angle, so as to achieve the effect of large-area lighting. [0003] However, in actual use, after the light emitted by the LED light source is diffused by the lens, because the light is relatively concentrated near the optical axis of the LED light source, it cannot completely eliminate the hot spot in the center of the light field. When it is used in backlighting will reduce the overall lighting effect. ...

AI Technical Summary

Problems solved by technology

[0003] However, in actual use, after the light emitted by the LED light source is diffused by the lens, because the light is relatively concentrated near the optical axis of the LED light source, it cannot completely eliminate the hot spot in the center of the light field. When it is used in backlighting will reduce the overall light effect

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