Lens and illuminating device having the lens

摘要

The present invention relates to a lens (100) for an illuminating device, wherein the lens (100) has a bottom surface (1) and an emergent surface (2) protruding from the bottom surface (1), the bottom surface (1) comprises a recessed region (3) that forms an incident surface (4), characterized in that the emergent surface and the incident surface are configured in such a manner that light is incident upon the incident surface and emits from the emergent surface, the light emitted from the emergent surface forms symmetrical light spots at both sides of a first section (V1) defined by an optical axis (A) of a light source (5) of the illuminating device and a first straight line perpendicular to the optical axis (A), and forms asymmetrical light spots at both sides of a second section (V2) defined by the optical axis (A) and a second straight line perpendicular to the first straight line, wherein light emitted from the emergent surface (2) produces uniform luminance (L) after reflected by various positions of an illuminated surface (S). The present invention further relates to an illuminating device having the above lens (100).