A LENS AND A LIGHTING UNIT USING THE LENS
FIG5 shows a clearer plan view of the lens design of FIG4
FIG5 shows a clearer plan view, which shows the annular array 82 of light sources 83 more clearly, which are aligned with the central portions 36 of the beam shaping portions 62a, 62b. The annular Fresnel teeth are shown as the ridges 84.
plan view
84
ridges
34
82
annular array
36
central portion central portions portions portion
70
whole lens example from about angle 52b maybe
83
light sources
['1. A lens (30) for providing wide beam illumination from a light source (40), comprising: a lens body (31) comprising a light entry side (33) and a light exit side (32), wherein in cross section the lens body comprises a beam shaping portion having an optical axis (35), wherein a light source location (40) is defined in the vicinity of the light entry side (33), wherein the beam shaping portion comprises: a central portion (36), with respect to the optical axis, on the light entry side (33) facing the light source location and adapted to direct light output from the light source location (40) as a diverging beam; and Fresnel tooth portions (42a, 42b; 44a, 44b; 46a, 46b) on the light entry side (33) and on both lateral sides of the optical axis (35), wherein the Fresnel tooth portions are adapted to direct light output from the light source location (40) as a reflected beam which converges towards the optical axis (35), wherein tooth portions on opposite sides of the central portion (36) are adapted to direct light output from the light source location (40) as converging beams which converge to a set of different convergence locations (60) on the light exit side (32).', '12. A lighting unit comprising: a lens as claimed in claim 8, 9 or 10; and an annular array (82) of light sources (83) aligned with the central portions (36) of the beam shaping portions.']