Lens and an illumination device having the lens

An illumination device comprising a lens

• the lens comprising:
• a bottom surface;
• and
• a first side surface and a second side surface which respectively extend inclinedly upwards from two sides of the bottom surface and converge,
• wherein the bottom surface comprises a supporting surface and an incident surface, the incident surface defining an accommodation cavity for accommodating a light source of the illumination device,
• wherein the first side surface comprises a first emergent surface and a first reflective surface, the second side surface comprises a second emergent surface, wherein a first part of light from the incident surface emerges from the first emergent surface, and a second part of light from the incident surface at least emerges from the second emergent surface after reflected by the first reflective surface, such that the emergent light is distributed at an angle of 360°,
• wherein the supporting surface of the lens is supported on the other side of the heat sink, and the second side surface of the lens is arranged such that a projection of the second side surface on the other side of the heat sink does not overlap a projection of the heat sink.

A lens for an illumination device, in a cross section, the lens comprising:

• a bottom surface;
• and
• a first side surface and a second side surface which respectively extend inclinedly upwards from two sides of the bottom surface and converge,
• wherein the bottom surface comprises a supporting surface and an incident surface, the incident surface defining an accommodation cavity for accommodating a light source of the illumination device,
• wherein the first side surface comprises a first emergent surface and a first reflective surface, the second side surface comprises a second emergent surface,
• wherein a first part of light from the incident surface emerges from the first emergent surface, and a second part of light from the incident surface at least emerges from the second emergent surface after reflected by the first reflective surface, such that the emergent light is distributed at an angle of 360°,
• wherein the lens is configured to be a ring shape, and is rotationally symmetrical with respect to an axis which is perpendicular to the bottom surface,
• wherein the second side surface further comprises a second reflective surface, the second part of light from the incident surface at least partially emerges from the second emergent surface after reflected by the second reflective surface and the first reflective surface in sequence,
• wherein the incident surface comprises a first incident surface portion, a second incident surface portion, and a third incident surface portion, wherein a first part of light from the light source incidents into the first incident surface portion and emerges after refracted by the first emergent surface, and one part of a second part of light from the light source incidents into the second incident surface portion and emerges from the second emergent surface after reflected by the first reflective surface, and the other part of the second part of light from the light source incidents into the third incident surface portion and emerges from the second emergent surface after reflected by the second reflective surface and the first reflective surface in sequence.