Lens having multiple conic sections for LEDs and proximity sensors
View Patent ↗A lens element comprising a base, a plurality of lens sections and a top lens section is disclosed. The plurality of lens sections are formed above a planar parallel to the base with each of the lens sections being positioned rotationally symmetric about an optical axis. The lens sections define a dome shape with every adjoining lens sections being conjugated with each other. A top lens section is formed at the center above the other lens sections and conjugated therewith. All of the lens sections are conjugated with each of its neighboring lens sections. Each of the lens sections has a optical property to direct light towards a target point. The target point may be positioned along the optical axis.
1. A light source package having a die encapsulated by a lens element used for directing light along an optical axis, the lens element comprising:
a base encapsulating the die;
a plurality of lens sections formed above and planarly parallel to the base; wherein the plurality of lens sections comprise four lens sections having dome shape and the plurality of lens sections are positioned rotationally symmetric about the optical axis with successive lens sections being conjugated;
a top lens section formed overlappingly above the lens sections and conjugating top portions of the lens sections; and,
a filler section formed at intersections of the top lens section and the plurality of lens sections.
2. The light source package of claim 1 , wherein the base, the plurality of lens sections, and the top lens section are coaxially aligned.
3. The light source package of claim 1 , wherein the plurality of lens sections are configured to illuminate target points positioned at a planar perpendicular to the optical axis.
4. The light source package of claim 1 , wherein the plurality of lens sections are configured to illuminate target points positioned along the optical axis.
5. The light source package of claim 1 , wherein the lens element is fabricated from an optically transmissive material that encapsulates the lens element interior volume.
6. The light source package of claim 1 , wherein the base has an extended portion forming a flange.
7. The light source package of claim 1 , wherein all of the lens sections has similar size.
8. The light source package of claim 7 , wherein the top lens has a diameter ranging between 0.2 to 5 times of the lens sections.
9. The light source package of claim 1 , wherein the lens element forms a portion of a proximity sensor.
10. A proximity sensor having a substrate, a transmitter die for emitting light, a receiver die, a first lens element encapsulating the transmitter die, a second lens element encapsulating the receiver die, at least one of the first and second lens elements comprising:
a base;
a plurality of lens sections formed above and planarly parallel to the base, the plurality of lens sections being positioned rotationally symmetric about an optical axis perpendicular to the substrate with successive lens sections being conjugated;
a top lens section overlappingly above the lens sections and conjugating top portions of the plurality of lens sections; and,
a filler section located at intersections of the top lens section and the plurality of lens sections;
wherein the plurality of lens sections comprise four lens sections having dome shape.
11. The proximity sensor of claim 10 , wherein the base, the plurality of lens sections, and the top lens section are coaxially aligned.
12. The proximity sensor of claim 10 , wherein the plurality of lens sections are configured to illuminate target points positioned along the optical axis.
13. The proximity sensor of claim 10 , wherein the plurality of lens sections are configured to illuminate target points positioned at a surface parallel to the substrate.
14. The proximity sensor of claim 10 , wherein the first and second lens element are fabricated from an optically transmissive material that encapsulates the first and second lens elements interior volume respectively.
15. The proximity sensor of claim 10 , wherein all of the lens sections has similar size in diameter and the top lens has a diameter ranging between 0.2 to 5 times of the lens sections.
16. The proximity sensor of claim 10 , wherein the other one of at least one of the first and the second lens element defines a dome shape.
17. The proximity sensor of claim 10 , wherein the base has an extended portion forming a flange.
18. The proximity sensor of claim 10 , wherein the first lens element and the transmitter die are housed in a first package; the second lens element and the receiver die are housed in a second package; and the first and second packages are attached to the substrate.
19. The proximity sensor of claim 10 , wherein the plurality of lens sections are configured to redirect the light emitted from the transmitter die to a plurality of different target points distanced from the package.