Optical device with through-hole cavity
View Patent ↗A light-emitting device having a through-hole cavity is disclosed. The optical device may contain a plurality of conductors, a light source die, a body and a transparent encapsulant material. The body may have a top surface and a bottom surface. A cavity is formed within the body extending from the bottom surface to the top surface and defining therein a bottom opening and a top opening, respectively. Optionally, the light-emitting device may comprise a lens. During manufacturing process, liquid or semi-liquid form transparent material is injected from the bottom surface into the cavity, encapsulating the light source die and forming a lens. The shape of the lens is defined by a mold aligned to the top opening of the body. In yet another embodiment, optical devices having a cavity or multiple cavities are disclosed. The optical devices may include a proximity sensor, an opto-coupler, an encoder and other similar sensors.
1. An optical device, comprising:
a plurality of conductors;
die attach areas formed on portions of the plurality of conductors;
a light source die attached on a first die attach area, wherein the light source die is configured to emit light;
a receiver die attached on a second die attach area;
a body encapsulating parts of the plurality of conductors extending through the body, the body having a top surface, a bottom surface and at least one side surface, wherein the at least one of the plurality of conductors extends through the at least one side surface;
a first cavity extending from the bottom surface to the top surface of the body, and defining therein an opening at each of the top and bottom surfaces;
a second cavity extending from the bottom surface to the top surface of the body and within which the receiver die is located, wherein the bottom surface further defines a second opening interconnected to the second cavity;
a transparent encapsulant formed within the cavity encapsulating the light source die, die attach areas and portions of the plurality of conductors within the cavity.
2. The optical device of claim 1 , wherein the transparent encapsulant extends over and above the top surface forming a lens.
3. The optical device of claim 1 , wherein a portion of the at least one of the plurality of conductors defines a cup shape configured to direct the light emitted from the light source die towards the top surface.
4. The optical device of claim 1 , wherein the first cavity extends vertically from the bottom surface to the top surface.
5. The optical device of claim 4 , wherein the first die attach area further comprises a horizontal flat planar surface on the portion of the at least one of the plurality of conductors.
6. The optical device of claim 1 , wherein the body comprises at least an internal wall configured to direct light toward the top surface of the body.
7. The optical device of claim 1 , wherein the transparent encapsulant is formed by injecting a liquid form encapsulant through the opening of the bottom surface followed by a curing process to solid form.
8. The optical device of claim 1 , wherein the optical device is a light-emitting device.
9. The optical device of claim 1 , wherein the transparent encapsulant defines a dome shape configured to direct the light emitted from the light source die to the receiver die.
10. The optical device of claim 1 , wherein a light barrier is located between the light source die and the receiver die.
11. The optical device of claim 1 , wherein the optical device forms a portion of a proximity sensor.
12. The optical device of claim 1 , wherein the optical device forms a portion of an optical encoder.