Lens for LED illumination
View Patent ↗A lens may include a light incident surface, a first light emergent surface and side surfaces joining the light incident surface and the first light emergent surface. The light incident surface defines a space for accommodating light sources. The side surface includes at least one total-internal reflection surface and at least one second light emergent surface, a first part of light passing through the light incident surface is refracted by the first light emergent surface and emerges to generate first emergent light, a second part of light passing through the light incident surface is reflected by the total-internal reflection surfaces to the first light emergent surface and is refracted by the first light emergent surface and emerges to generate second light emergent light, and a third part of light passing through the light incident surface is refracted by the second light emergent surfaces and emerges to generate third emergent light.
1. A lens, comprising:
a light incident surface,
a first light emergent surface and
side surfaces facing away from an optical axis in a direction perpendicular to the optical axis, the side surfaces joining the light incident surface and the first light emergent surface,
wherein the light incident surface defines a space for accommodating light sources,
wherein each side surface comprises at least one total-internal reflection surface and at least one second light emergent surface, a first part of light passing through the light incident surface is refracted by the first light emergent surface and emerges to generate first emergent light, a second part of light passing through the light incident surface is reflected by the total-internal reflection surfaces to the first light emergent surface and is refracted by the first light emergent surface and emerges to generate second emergent light, and a third part of light passing through the light incident surface is refracted by the second light emergent surfaces and emerges to generate third emergent light,
wherein a plurality of total-internal reflection surfaces are spaced apart from each other, and adjacent total-internal reflection surfaces define the second light emergent surfaces therebetween,
wherein a cross sectional shape of each second light emergent surface is a groove recessed away from an optical axis in a direction perpendicular to the optical axis,
wherein respective second light emergent surface comprises a transmission portion parallel to the optical axis and a joining portion perpendicular to the optical axis.
2. The lens according to claim 1 ,
wherein any of the total-internal reflection surfaces are spline-curve sections intercepted in sequence in cross section from a spline curve from the light incident surface to the first light emergent surface.
3. The lens according to claim 1 ,
wherein the light incident surface has an arc-shaped first incident surface and second incident surfaces joining the first incident surface and the side surfaces, and the first incident surface and the second incident surfaces define a cavity recessed towards the first light emergent surface in a direction of the optical axis.
4. The lens according to claim 3 ,
wherein a cross-sectional shape of the first incident surface is a circular arc.
5. The lens according to claim 3 ,
wherein a cross-sectional shape of the first incident surface is a spline curve.
6. The lens according to claim 3 ,
wherein respective second incident surface defines a cylinder symmetrical with respect to the optical axis.
7. The lens according to claim 1 ,
wherein the lens is elongated and symmetrical with respect to a plane where the optical axis is located.
8. The lens according to claim 1 ,
further comprising joining surface parallel to the first light emergent surface between the light incident surface and each side surface.
9. The lens according to claim 1 ,
wherein the first light emergent surface is a planar surface perpendicular to the optical axis.
10. An illuminating device, comprising light sources, and a lens,
the lens comprising:
a light incident surface,
a first light emergent surface, and
side surfaces facing generally away from an optical axis in a direction perpendicular to the optical axis, the side surfaces joining the light incident surface and the first light emergent surface,
wherein the light incident surface defines a space for accommodating light sources,
wherein each side surface comprises at least one total-internal reflection surface and at least one second light emergent surface, wherein a first part of light passing through the light incident surface is refracted by the first light emergent surface and emerges to generate first emergent light, a second part of light passing through the light incident surface is reflected by the total-internal reflection surfaces to the first light emergent surface and is refracted by the first light emergent surface and emerges to generate second emergent light, and a third part of light passing through the light incident surface is refracted by the second light emergent surfaces and emerges to generate third emergent light,
wherein a plurality of total-internal reflection surfaces are spaced apart from each other, and adjacent total-internal reflection surfaces define the second light emergent surfaces therebetween,
wherein a cross sectional shape of each second light emergent surface is a groove recessed away from an optical axis in a direction perpendicular to the optical axis,
wherein respective second light emergent surface comprises a transmission portion parallel to the optical axis and a joining portion perpendicular to the optical axis.
11. The illuminating device according to claim 10 , wherein the light sources are LED chips.
12. A lens, comprising:
a light incident surface,
a first light emergent surface and
side surfaces joining the light incident surface and the first light emergent surface, wherein the light incident surface defines a space for accommodating light sources,
wherein each side surface comprises at least one total-internal reflection surface and at least one second light emergent surface, a first part of light passing through the light incident surface is refracted by the first light emergent surface and emerges to generate first emergent light, a second part of light passing through the light incident surface is reflected by the total-internal reflection surfaces to the first light emergent surface and is refracted by the first light emergent surface and emerges to generate second emergent light, and a third part of light passing through the light incident surface is refracted by the second light emergent surfaces and emerges to generate third emergent light;
wherein a plurality of total-internal reflection surfaces are spaced apart from each other, and adjacent total-internal reflection surfaces define the second light emergent surfaces therebetween;
wherein a cross sectional shape of each second light emergent surface is a groove recessed away from an optical axis in a direction perpendicular to the optical axis; and
wherein respective second light emergent surface comprises a transmission portion parallel to the optical axis and a joining portion perpendicular to the optical axis.
13. The lens according to claim 12 ,
wherein the light incident surface has an arc-shaped first incident surface and second incident surfaces joining the first incident surface and the side surfaces, and the first incident surface and the second incident surfaces define a cavity recessed towards the first light emergent surface in a direction of the optical axis.
14. The lens according to claim 13 ,
wherein a cross-sectional shape of the first incident surface is a circular arc.
15. The lens according to claim 13 ,
wherein a cross-sectional shape of the first incident surface is a spline curve.
16. The lens according to claim 13 ,
wherein respective second incident surface defines a cylinder symmetrical with respect to the optical axis.
17. The lens according to claim 12 ,
wherein the first light emergent surface is a planar surface perpendicular to the optical axis.