Light guide element and light source device using the light guide element

摘要

A light guide element and a light source device using the same are provided. The light guide element has a main body. The main body has a hollow portion with a cone shape and a microstructure pattern formed on the main body. The cone-shaped hollow portion has a bottom portion and a top portion. The bottom portion is located on the bottom surface of the main body, and has a first hollow cross section area. The top portion is opposite to the bottom surface, and has a second cross section area smaller than the first cross section area. The microstructure pattern includes high-density areas and low-density areas to improve a light distribution caused by the cone-shaped hollow portion. The light source device includes the light guide element and a ht emitting diode (LED). The LED is used to emit light into the cone-shape hollow portion through the bottom portion.

主权项

1. A light guide element, comprising:
a main body having:
an upper optic surface;a lower optic surface opposite to the upper optic surface; anda cross-sectional cone-shaped hollow portion located at the lower optic surface and used to receive exterior light;wherein at least one of the upper optic surface and the lower optic surface has a first microstructure pattern comprising a plurality of high-density areas and a plurality of low-density areas, and the high-density areas and the low-density areas are arranged alternately, and the high-density areas have microstructures designed with a density higher than a density of microstructures in the low-density areas;wherein the cross-sectional cone-shaped hollow portion comprises:a bottom portion located at the lower optic surface, and having a first hollow cross-sectional area; anda top portion opposite to the bottom portion, and having a second hollow cross-sectional area, wherein the second hollow cross-sectional area is smaller than the first hollow cross-sectional area, and a center of concentric circles formed by the low-density areas and the high-density areas is located on the top portion.