Optical Sensor Package Recesses for Crosstalk Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optical crosstalk in optical sensing modules remains a challenge as they shrink in size, with existing designs failing to adequately reduce direct light transmission from the emitter to the detector, leading to increased production costs and reduced sensing precision.
Innovation Solution
The optical sensing apparatus features a base with independent circuit regions for the emitter and detector, covered by a package structure with strategically designed recess portions that alter the light transmission path, including a first recess portion between the emitter and detector and a second recess portion on the detector, to reduce direct light transmission and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal mask component is adopted to provide optical isolation between emitter and detector, then optical crosstalk is minimized, but production cost increases
Solution Approach 1:
The patent removes the metal mask component from the optical sensing module and replaces it with a scattering layer integrated into the package structure. This extraction of the harmful metal mask eliminates the need for additional components while maintaining optical isolation through the scattering effect of the alternative material layer.
Solution Approach 2:
The patent introduces a scattering layer as an intermediary substance between the emitter and detector. This scattering layer serves as a mediator that provides optical isolation through light scattering mechanisms, replacing the metal mask's isolation function with a different physical mechanism that is more cost-effective and integrable into the package structure.
2Volume of moving object
If the optical sensing apparatus is made smaller in size, then miniaturization is achieved, but optical crosstalk reduction becomes insufficient
Solution Approach 1:
The patent changes the optical parameters of the package structure by introducing a scattering layer with specific scattering properties. This parameter change allows the maintenance of effective optical isolation in a reduced-size configuration, where the scattering characteristics of the layer compensate for the reduced physical distance between emitter and detector that would otherwise allow more crosstalk.
Solution Approach 2:
The patent applies local quality enhancement by positioning the scattering layer specifically in regions where light scattering is most needed to prevent crosstalk. The scattering layer is strategically placed and configured to provide localized optical isolation where it is most effective, allowing miniaturization while maintaining crosstalk reduction performance in critical areas.
3Device complexity
If a simple opening is formed between emitter and detector to reduce crosstalk, then structure is simplified, but direct light transmission is not sufficiently blocked
Solution Approach 1:
The patent uses a scattering layer that can be integrated into the existing package structure, effectively copying or replicating the optical isolation function of more complex structures in a simpler, more integrated form. The scattering layer provides the necessary light blocking function without requiring complex multi-component assemblies.
Solution Approach 2:
The patent employs composite material strategies by integrating the scattering layer into the package structure, creating a composite optical path control system. The scattering layer is combined with the package substrate to form an integrated structure that provides both mechanical support and optical isolation functions, maintaining simplicity while effectively blocking direct light transmission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively decreases direct light transmission to the detector, enhancing sensing precision and reducing optical crosstalk, thereby improving the overall performance of the optical sensing apparatus.
Implementation Method 1
a scattering path of light generated from the emitter of the package structure is altered through the first recess portion and the second recess portion
Data Source
AI summary
An optical sensing apparatus includes a base, and an emitter and a detector that are respectively disposed on the base. A package structure covers the emitter and the detector, a first recess portion divides the emitter and the detector, and a second recess portion is located on the detector. A scattering path of light generated by the emitter is altered by the first recess portion and the second recess portion.