Optical Sensing Assembly Asymmetric Surface Geometry
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Solution Overview
Problem
Conventional optical sensing assemblies experience optical crosstalk due to light reflection from surfaces with different refractive indices, leading to misjudgment of object distance, and increasing the distance between light emitting and sensing elements to reduce crosstalk results in higher costs or larger sizes.
Innovation Solution
The optical sensing assembly features a light emitting surface arranged nonparallel to a light receiving surface, with the structures encapsulating these elements positioned side by side and the light emitting surface located on side surfaces of the first structure, while the light receiving surface is on the top surface of the second structure, allowing for effective distance sensing without parallel alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the light emitting element and the light sensing element is increased to reduce optical crosstalk, then the optical crosstalk is decreased, but the assembly cost increases or the volume increases
Solution Approach 1:
The light emitting surface and light receiving surface are arranged in a non-parallel asymmetric configuration. The light emitting surface is located on the side surface of the first structure while the light receiving surface is on the top surface of the second structure, creating an asymmetric light path that prevents direct reflection from reaching the sensing element, thereby reducing optical crosstalk without increasing assembly volume.
2Measurement precision
If the distance between the light emitting element and the light sensing element is increased to reduce optical crosstalk, then the optical crosstalk is decreased, but the assembly cost increases
Solution Approach 1:
The asymmetric arrangement of light emitting and receiving surfaces on different faces of the encapsulating structures eliminates the need for increased separation distance or additional light shielding components. This simplifies the manufacturing process and reduces assembly cost while effectively reducing optical crosstalk.
3Device complexity
If the light emitting surface is arranged parallel to the light receiving surface, then the structure is simplified, but optical crosstalk occurs due to light reflection from surfaces with different refractive indices
Solution Approach 1:
By arranging the light emitting surface and light receiving surface in a non-parallel asymmetric configuration (side surface vs. top surface), the patent prevents direct reflection paths while maintaining relatively simple encapsulating structures. This asymmetric geometry inherently blocks reflected light from reaching the sensing element without requiring complex additional components.
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 configuration significantly reduces optical crosstalk even in compact designs, enhancing distance detection accuracy while maintaining a small size and reducing costs.
Implementation Method 1
a light emitting element... a light is emitted by the light emitting element to outside of the optical sensing assembly via the light emitting surface
Implementation Method 2
the light reflected by the to-be-detected object is received by the light sensing element via the light receiving surface, the light sensing element is configured to perform distance sensing
Implementation Method 3
the light emitting surface is not parallel to the light receiving surface... significantly reduces optical crosstalk
Data Source
AI summary
There are provided an optical sensing assembly, a method for manufacturing an optical sensing assembly, and an optical sensing system. In the optical sensing assembly, a light emitting surface of a light emitting element is arranged in nonparallel to a light receiving surface of a light sensing element. Further, the optical sensing system is formed by the optical sensing assembly and a light guide assembly. Therefore, a distance between light emitted by the light emitting element to a to-be-detected object and light received by the light sensing element is increased, so that optical crosstalk can be greatly suppressed even if the optical sensing assembly has a small size, thereby improving distance detection accuracy.