Image sensing device with cap and related methods
View Patent ↗An image sensing device may include an interconnect layer and grid array contacts carried by the interconnect layer, and an image sensor IC carried by the interconnect layer and coupled to the grid array contacts, the image sensor IC having an image sensing surface. The image sensing device may include a transparent plate carried by the image sensor IC and aligned with the image sensing surface, and a cap carried by the interconnect layer and having an opening aligned with the image sensing surface. The cap may have an upper wall spaced above the interconnect layer and the image sensor IC to define an internal cavity, and the cap may define an air vent coupled to the internal cavity.
1. An image sensing device comprising:
an interconnect layer and a plurality of grid array contacts carried thereby;
an image sensor integrated circuit (IC) carried by said interconnect layer and coupled to said plurality of grid array contacts, said image sensor IC having an image sensing surface;
a transparent plate carried by said image sensor IC and aligned with the image sensing surface; and
a cap carried by said interconnect layer and having an opening aligned with the image sensing surface;
said cap having an upper wall spaced above said interconnect layer and said image sensor IC to define an internal cavity;
said cap defining an air vent directly coupled between the internal cavity and an external atmospheric environment so that the internal cavity is freely and fluidly coupled to the external atmospheric environment and so that said image sensor IC remains exposed to the external atmospheric environment;
said cap having an inner peripheral edge spaced from adjacent portions of said transparent plate to define the air vent.
2. The image sensing device of claim 1 wherein said inner peripheral edge extends laterally over the adjacent portions of said transparent plate.
3. The image sensing device of claim 1 further comprising a plurality of bond wires extending between said image sensor IC and said interconnect layer.
4. The image sensing device of claim 3 further comprising encapsulation material covering a portion of said plurality of bond wires.
5. The image sensing device of claim 1 further comprising a first adhesive layer between said cap and said interconnect layer, and a second adhesive layer between said transparent plate and said image sensor IC.
6. The image sensing device of claim 1 wherein the air vent has a vertical gap of 250-500 microns.
7. The image sensing device of claim 1 further comprising a surface mounted component (SMC) carried by said interconnect layer.
8. The image sensing device of claim 1 wherein said image sensor IC comprises a substrate defining the image sensing surface on an upper surface of the substrate.
9. An image sensing device comprising:
an interconnect layer and a plurality of ball grid array (BGA) contacts carried thereby;
an image sensor integrated circuit (IC) carried by said interconnect layer and coupled to said plurality of BGA contacts, said image sensor IC having an image sensing surface;
a transparent plate carried by said image sensor IC and aligned with the image sensing surface;
a cap carried by said interconnect layer and having an opening aligned with the image sensing surface;
a plurality of bond wires extending between said image sensor IC and said interconnect layer; and
encapsulation material covering a portion of said plurality of bond wires;
said cap having an upper wall spaced above said interconnect layer and said image sensor IC to define an internal cavity;
said cap defining an air vent directly coupled between the internal cavity and an external atmospheric environment so that the internal cavity is freely and fluidly coupled to the external atmospheric environment and so that said image sensor IC remains exposed to the external atmospheric environment;
said cap having an inner peripheral edge spaced from adjacent portions of said transparent plate to define the air vent.
10. The image sensing device of claim 9 wherein said inner peripheral edge extends laterally over the adjacent portions of said transparent plate.
11. The image sensing device of claim 9 wherein the air vent has a vertical gap of 250-500 microns.
12. The image sensing device of claim 9 further comprising a surface mounted component (SMC) carried by said interconnect layer.
13. The image sensing device of claim 9 wherein said image sensor IC comprises a substrate defining the image sensing surface on an upper surface of the substrate.
14. A method for making an image sensing device comprising:
coupling an image sensor integrated circuit (IC) to an interconnect layer and to a plurality of grid array contacts carried by the interconnect layer, the image sensor IC having an image sensing surface;
coupling a transparent plate to the image sensor IC and aligned with the image sensing surface; and
coupling a cap to the interconnect layer and having an opening aligned with the image sensing surface, the cap having an upper wall spaced above the interconnect layer and the image sensor IC to define an internal cavity, and the cap defining an air vent directly coupled between the internal cavity and an external atmospheric environment so that the internal cavity is freely and fluidly coupled to the external atmospheric environment and so that the image sensor IC remains exposed to the external atmospheric environment;
the cap having an inner peripheral edge spaced from adjacent portions of the transparent plate to define the air vent.
15. The method of claim 14 wherein the inner peripheral edge extends laterally over the adjacent portions of the transparent plate.
16. The method of claim 14 wherein the air vent has a vertical gap of 250-500 microns.
17. The method of claim 14 further comprising positioning a surface mounted component (SMC) on the interconnect layer.
18. The method of claim 14 wherein the image sensor IC comprises a substrate defining the image sensing surface on an upper surface of the substrate.