Method and structure for alignment of lens to optical product at PCBA level
An optical package includes: a Printed Circuit Board including a plurality of cut-out sections; a lens, including a first plurality of protrusions corresponding respectively to the plurality of cut-out sections, wherein when the lens is placed under the PCB, the protrusions will pass through the cut-out sections; and a sensor for attaching on to the lens and the PCB. The first plurality of protrusions has a shape from the group including: snap features, guide posts and guide posts with tight-fit ribs.
1. An optical package, comprising:
a Printed Circuit Board (PCB) comprising a plurality of cut-out sections;
a lens, comprising a first plurality of protrusions corresponding respectively to the plurality of cut-out sections, wherein the first plurality of protrusions comprises three protrusions being snap features, a first protrusion of the first plurality of protrusions is formed on a first side of the lens, and a second protrusion of the first plurality of protrusions is formed on a second side of the lens opposite to the first side, and when the lens is placed under the PCB, the first plurality of protrusions will pass through the cut-out sections; and
a sensor for attaching on to the lens and the PCB;
wherein the snap features comprise inward-facing protrusions which attach to the top of the sensor.
2. The optical package of claim 1 , wherein the at least two protrusions are of a different shape from each other.
3. The optical package of claim 1 , wherein the first plurality of protrusions further comprises a third protrusion having a different shape from the at least two protrusions.
4. The optical package of claim 3 , wherein the first plurality of protrusions has a shape from the group comprising: snap features, guide posts and guide posts with tight-fit ribs.
5. The optical package of claim 4 , wherein at least one of the first plurality of protrusions is guide posts, and the guide posts are heat staked to the PCB.
6. The optical package of claim 4 , wherein at least one of the first plurality of protrusions is guide posts, and the guide posts are glued to the PCB.
7. The optical package of claim 6 , wherein the guide posts are glued to the PCB using an epoxy.
8. The optical package of claim 4 , wherein at least one of the first plurality of protrusions is snap features, and the snap features comprise outward-facing protrusions which attach to the PCB.
9. The optical package of claim 1 , wherein the lens further comprises a first feature and the sensor has a protrusion, wherein the first feature is designed to correspond to the protrusion for fixing the lens to the sensor.
10. The optical package of claim 9 , wherein the first feature is cylindrical and corresponds to a shape of the lens.
11. The optical package of claim 1 , wherein the first plurality of protrusions is snap features, and the snap features comprise inward-facing protrusions which attach to the top of the sensor.
12. A method for designing an optical package, comprising:
forming a lens comprising a first plurality of protrusions and a first feature;
forming a Printed Circuit Board (PCB) comprising a plurality of cut-out sections corresponding respectively to the first plurality of protrusions;
placing the lens under the PCB so that the first plurality of protrusions pass through the plurality of cut-out sections; and
attaching a sensor on to the lens and the PCB, wherein the sensor comprises a protrusion, the step of attaching the sensor on to the lens and the PCB comprising:
attaching the sensor on to the lens so that the protrusion corresponds to the first feature.
13. The method of claim 12 , wherein the first plurality of protrusions comprises at least two protrusions.
14. The method of claim 13 , wherein a first protrusion of the first plurality of protrusions is formed on a first side of the lens, and a second protrusion of the first plurality of protrusions is formed on a second side of the lens opposite to the first side.
15. The method of claim 13 , wherein the at least two protrusions are of a same shape.
16. The method of claim 15 , wherein the first plurality of protrusions further comprises a third protrusion having a same shape as the at least two protrusions.
17. The method of claim 15 , wherein the first plurality of protrusions further comprises a third protrusion having a different shape from the at least two protrusions.
18. The method of claim 17 , wherein the first plurality of protrusions has shapes from the group comprising: snap features, guide posts and guide posts with tight-fit ribs.
19. The optical package of claim 18 , wherein at least one of the first plurality of protrusions is guide posts, and the method further comprises:
heat-staking the guide posts to the PCB.
20. The optical package of claim 18 , wherein at least one of the first plurality of protrusions is guide posts, and the method further comprises:
gluing the guide posts to the PCB.
21. The optical package of claim 20 , wherein the guide posts are glued to the PCB using an epoxy.
22. The optical package of claim 18 , wherein at least one of the first plurality of protrusions is snap features, and the snap features comprise outward-facing protrusions which attach to the PCB.
23. The method of claim 13 , wherein the at least two protrusions are of a different shape from each other.
24. The method of claim 12 , wherein the first feature is cylindrical and corresponds to a shape of the lens.