Measurement Sensor Package with Recessed Substrate for Noise Reduction
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Solution Overview
Problem
Measurement sensors for blood flow face challenges in accurately measuring biological information due to electromagnetic noise interference, which affects measurement accuracy and sensitivity.
Innovation Solution
A measurement sensor package with a substrate featuring recesses for a light emitter and receiver, including connection pads and a ground conductor layer, is designed to minimize electromagnetic interference by positioning the pads to shield electromagnetic waves and reduce optical cross-talk, while the ground conductor layer and via conductors manage electric charge to prevent noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light emitter and light receiver are arranged close to each other on the substrate, then the device size is reduced and integration is improved, but electromagnetic noise interference increases and measurement accuracy deteriorates
Solution Approach 1:
The substrate is divided into functionally independent regions: a light emitter region with connection pads, a light receiver region with connection pads, and a ground conductor layer. The recesses physically separate the light emitter and light receiver, creating spatial segmentation that reduces electromagnetic interference while maintaining compact integration.
Solution Approach 2:
Different regions of the substrate are assigned different functional qualities: the first and second recesses provide localized shielding and positioning for the light emitter and light receiver, the connection pads are positioned to minimize electromagnetic coupling, and the ground conductor layer provides localized electromagnetic shielding in specific areas to protect sensitive measurements.
2Ease of operation
If connection pads are positioned for electrical connection, then ease of connection is improved, but electromagnetic waves enter the pads and generate noise reducing measurement accuracy
Solution Approach 1:
The recesses act as intermediary structures between the connection pads and the external environment. These recesses with light-shielding bonds create a protective interface that allows electrical connections to be made while simultaneously blocking electromagnetic waves from directly reaching the connection pads, thus preventing noise generation.
Solution Approach 2:
The ground conductor layer and light-shielding bonds are positioned in advance to counteract electromagnetic interference before it can reach the connection pads. This preliminary protective arrangement prevents electromagnetic waves from entering the signal wiring conductors and generating noise, ensuring measurement accuracy is maintained.
3Object-affected harmful factors
If a light-shielding bond is used to surround the illuminator and light receiver, then electromagnetic shielding is improved, but the device structure becomes more complex
Solution Approach 1:
The light-shielding bond serves multiple functions simultaneously: it provides electromagnetic shielding for the light emitter and light receiver, it creates the recesses for mounting components, and it establishes the structural framework for the substrate. This merging of shielding and structural functions reduces overall device complexity while maintaining effective electromagnetic protection.
Solution Approach 2:
The ground conductor layer performs multiple roles: it provides electromagnetic shielding, serves as a reference potential for electrical connections, and acts as a structural element of the substrate. This multi-functionality reduces the need for separate dedicated shielding components, thereby simplifying the overall device structure.
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 enhances measurement accuracy by reducing electromagnetic noise and improving sensitivity by shielding electromagnetic waves and managing electric charge effectively, leading to more precise biological information measurement.
Implementation Method 1
an illuminator arranged on the substrate to illuminate blood with light
Implementation Method 2
When blood is illuminated with light, the light is scattered by blood cells, such as red blood cells
Implementation Method 3
Measurement of blood flow uses, for example, the Doppler effect of light. The frequency of the illuminating light and the frequency of the scattered light are used to calculate the traveling speed of the blood cells
Data Source
AI summary
A measurement sensor package and a measurement sensor reduce susceptibility to noise and enable highly accurate measurement. A measurement sensor package includes a substrate. The substrate includes a first recess including a first bottom surface on which a light emitter is mountable, and a first step surface having a first connection pad thereon, a second recess including a second bottom surface on which a light receiver is mountable, and a second step surface having a second connection pad thereon. In a direction connecting a center of the first bottom surface and a center of the second bottom surface in a plan view, the first step surface is located outward from the first bottom surface and the second step surface is located outward from the second bottom surface.