Reflowable opto-electronic module
View Patent ↗An optical proximity sensor module includes a substrate, a light emitter mounted on a first surface of the substrate, the light emitter being operable to emit light at a first wavelength, and a light detector mounted on the first surface of the substrate, the light detector being operable to detect light at the first wavelength. The module includes an optics member disposed substantially parallel to the substrate, and a separation member, wherein the separation member is disposed between the substrate and the optics member. Multiple modules can be fabricated in a wafer-level process and can be composed of reflowable materials so that the modules can be incorporated more easily into devices whose manufacture occurs, at least in part, at elevated temperatures when the module is integrated into the device or during subsequent manufacturing processes.
1. An optical proximity sensor module comprising:
a substrate;
a light emitter mounted on a first surface of the substrate, the light emitter operable to emit light at a first wavelength;
a light detector mounted on the first surface of the substrate, the light detector operable to detect light at the first wavelength;
an optics member composed of a first polymer material and disposed substantially parallel to the substrate, wherein the optics member comprises first and second transparent portions that are transparent to light at the first wavelength, the optics member further comprising a blocking portion that substantially attenuates or blocks incident light at the first wavelength, and wherein the first transparent portion is disposed above the light emitter and the second transparent portion is disposed above the light detector; and
a separation member composed of a second polymer material, wherein the separation member is disposed between, and in contact with, the substrate and the optics member, and wherein the separation member surrounds the light emitter and the light detector,
wherein the first polymer material and the second polymer material are each thermally stable up to at least 260° C.
2. The optical proximity sensor module of claim 1 wherein at least one of the first polymer material or the second polymer material comprises a thermosetting polymer.
3. The optical proximity sensor module of claim 2 wherein at least one of the first polymer material or the second polymer material comprises a thermally-cured epoxy.
4. The optical proximity sensor module of claim 2 wherein at least one of the first polymer material or the second polymer material comprises an ultraviolet (UV)-cured epoxy.
5. The optical proximity sensor module of claim 1 wherein at least one of the first polymer material or the second polymer material comprises a thermoplastic polymer.
6. The optical proximity sensor module of claim 5 wherein a glass transition temperature of the thermoplastic polymer is above about 260° C.
7. The optical proximity sensor module of claim 1 wherein each of the first transparent portion and the second transparent portion comprises a lens.
8. The optical proximity sensor module of claim 7 wherein each lens is composed of a third polymer material that is thermally stable up to at least 260° C.
9. The optical proximity sensor module of claim 8 wherein the third polymer material is a thermosetting polymer or a thermoplastic polymer.
10. The optical proximity sensor module of claim 8 wherein the third polymer material comprises a thermally-cured epoxy material.
11. The optical proximity sensor module of claim 8 wherein the third polymer material comprises a UV-cured epoxy.
12. The optical proximity sensor module of claim 8 wherein the third polymer material is transparent to light at the first wavelength.