A LENS AND AN ASYMMETRICAL LIGHT DISTRIBUTION ILLUMINATING DEVICE HAVING SUCH LENS

摘要

The present invention relates to a lens for a linear light source comprising a top and a bottom, the bottom comprising an incident surface (1), and a first supporting surface (4a) and a second supporting surface (4b) at both sides of the incident surface (1), and the top comprising an emergent surface (2), wherein the top further comprises a total internally reflective surface (3), and wherein in a cross section, the emergent surface (2) is connected with the first supporting surface (4a), the total internally reflective surface (3) is connected with the second supporting surface (4b), one part of light from the linear light source emerges after refracted by the incident surface (1) and the emergent surface (2), and the other part of light is refracted by the incident surface (1) to the total internally reflective surface (3) to be total internally reflected and emerges after refracted by the emergent surface (2). In addition, the present invention further relates to an asymmetrical light distribution illuminating device having such lens.