Optical sensor
The present disclosure relates to an optical sensor module, an optical sensing accessory, and an optical sensing device. An optical sensor module comprises a light source, a photodetector, and a substrate. The light source is configured to convert electric power into radiant energy and emit light to an object surface. The photodetector is configured to receive the light from an object surface and convert radiant energy into electrical current or voltage. An optical sensing accessory and an optical sensing device comprise the optical sensor module and other electronic modules to have further applications.
1. An optical sensor module, comprising:
a substrate;
a light source disposed on the substrate;
a first encapsulant formed over the light source;
a photodetector disposed on the substrate;
a second encapsulant formed over the photodetector; and
a partition coupled to the substrate and located between the light source and the photodetector, wherein at least one of the first encapsulant and the second encapsulant comprises multiple different refractive index layers, wherein each refractive index layer has a different refractive index;
a first microstructure disposed on a top surface of the first encapsulant, wherein the first microstructure is a set of concave concentric arcs facing towards the photodetector; and
a second microstructure disposed on a top surface of the second encapsulant, wherein the second microstructure is a set of concentric circles,
wherein light emitted by the light source and passed through the first microstructure and the second microstructure is concentrated toward a direction from the light source toward the photodetector.
2. The optical sensor module of claim 1 , wherein the one of the first and the second encapsulants with multiple refractive index layers comprises a first refractive index layer proximal to the substrate having a first refractive index that is substantially larger than a second refractive index of a second refractive index layer.
3. The optical sensor module of claim 1 , wherein the multiple refractive index layers comprise two refractive index layers that are adjacent to one another and a curvature lens is disposed between the two adjacent refractive index layers.
4. The optical sensor module of claim 1 , wherein the multiple refractive index layers comprise two refractive index layers that are adjacent to one another and the first microstructure is disposed between the multiple refractive index layers.
5. The optical sensor module of claim 1 , wherein the multiple refractive index layers comprise two refractive index layers that are adjacent to one another and a curvature lens is disposed on a top surface of the multiple refractive index layers.
6. The optical sensor module of claim 1 , wherein the optical sensor module further comprises a packaging wall coupled to the substrate to define an area surrounding the light source, the partition, and the photodetector.
7. The optical sensor module of claim 6 , wherein the optical sensor module further comprises a cover disposed on the packaging wall.
8. The optical sensor module of claim 7 , wherein the cover is configured with a curvature lens.
9. The optical sensor module of claim 7 , wherein the cover is configured with a third microstructure.
10. The optical sensor module of claim 7 , wherein the cover is coated with an anti-scratch thin film, an anti-reflective thin film, or a filter thin film.
11. The optical sensor module of claim 1 , wherein the optical sensor module further comprises at least one of an analogue front end, a microcontroller, an operational amplifier, or a light source driver.
12. An optical sensing accessory for detecting optical properties comprising:
at least one optical sensor module of claim 1 ;
a communication module electrically connected to the optical sensor module; and
a housing containing the optical sensor module and the communication module.
13. An optical sensing device for detecting optical properties comprising:
at least one optical sensor module of claim 1 ;
a microprocessor electrically connected to the optical sensor module;
a memory electrically connected to the optical sensor module and the microprocessor;
a power supply electrically connected to the optical sensor module and the memory; and
a housing containing the optical sensor module, the memory and the power supply.
14. The optical sensor module of claim 1 , wherein a distal portion of each of the refractive index layers is narrower than a proximal portion near to the light source or the photodetector.
15. The optical sensor module of claim 14 , wherein the distal portion is substantially parallel to the proximal portion.
16. The optical sensor module of claim 1 , wherein the first encapsulant and the second encapsulant are separately constructed of in a trapezoidal shape with a narrower upper part of first encapsulant and the second encapsulant.
17. The optical sensor module of claim 1 , wherein the arrangement of the first encapsulant and the second encapsulant form a reflectional symmetric pattern.
18. The optical sensor module of claim 1 , wherein the microstructure is a refractive microstructure or a diffractive microstructure.