| 摘要 |
The present invention relates to the secondary optical technology for LED (Solid Semiconductor Illumination), in particular, to a secondary optical lens for a LED projector. The lens of the projector comprises at least one or more lens units, characterized in that: the lens unit consists of a refraction portion in the centre and a total reflection portion on the outer ring thereof; the central refraction portion has a convex surface on the bottom and is attached with a plurality of micro lenses; the bottom attached with a micro lens array, besides functioning as light converging, may correct the projected square shadow of the LED chip to a circular light spot , and meanwhile effects light mixing; the total reflection portion on the outer ring of the lens unit comprises a cylindrical light incident surface with a slight draft angle, and a total reflection surface on the outer side thereof, which adopts a diamondoid polyhedral flake design and thereby effects light mixing so as to remove the color temperature difference in the centre and at the edge of the light spot; the top of the lens unit is a smooth plane surface used as the light emitting surface. |
