Multi-Axis Sensor Circuit Spatial Separation
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Solution Overview
Problem
Existing multi-axis acceleration sensors face challenges in achieving excellent detection characteristics due to signal interference between closely disposed signal processing circuits for different axes, leading to noise contamination and reduced accuracy in force detection.
Innovation Solution
A sensor device configuration with a base body having recessed sections for each circuit, allowing for maximum separation of first and second circuits processing signals from piezoelectric elements, reducing noise interference and enabling accurate signal processing, and incorporating a lid body to seal and protect the components, which can be stacked with quartz piezoelectric elements for enhanced sensitivity and dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If signal processing circuits for multiple axes are disposed close to one another on another substrate, then device integration is improved, but signal interference increases causing noise contamination
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement where circuits are stacked on another substrate to a three-dimensional configuration where circuits are disposed on opposite surfaces of the same substrate. This spatial separation in the third dimension (depth/thickness) effectively reduces signal interference while maintaining integration, as circuits for different axes are physically separated by the substrate thickness rather than being layered closely in two dimensions.
2Adaptability or versatility
If piezoelectric elements for multi-axis detection are disposed on a substrate with processing circuits on another substrate, then multi-axis detection capability is achieved, but signal interference between axes increases
Solution Approach 1:
The patent segments the signal processing circuits for different axes onto separate surfaces of the substrate rather than concentrating them on a single substrate or stacking them closely. This segmentation spatially separates the processing paths for different axes, reducing cross-axis signal interference and noise contamination while preserving multi-axis detection functionality.
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
The configuration effectively prevents noise interference, allowing for accurate detection of external forces in multiple axes, improving the sensor's detection characteristics and maintaining circuit integrity by protecting against moisture-induced deterioration.
Implementation Method 1
a force detection element disposed in the recessed section and including a first element that outputs a first signal according to an external force in a first direction and a second element that outputs a second signal according to an external force in a second direction different from the first direction
Data Source
AI summary
A sensor device includes a base body including a recess, a lid body configured to close an opening of the recess, a force detection element disposed in the recess and including a first element that outputs a first signal according to an external force in a first axis and a second element that stacks on the first element and outputs a second signal according to an external force in a second axis; a first circuit disposed in the recess and configured to process the first signal, and a second circuit disposed in the recess and configured to process the second signal.