Composite Sensor Housing as Multilayer Circuit Board
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Solution Overview
Problem
Conventional composite sensors for detecting angular velocity and acceleration are bulky due to the need for separate circuit boards for wiring, which hinders their miniaturization for use in posture control and navigation systems of movable bodies.
Innovation Solution
A composite sensor design that integrates angular velocity and acceleration detecting elements with signal processing ICs within a multilayered circuit board housing, eliminating the need for separate circuit boards and allowing direct electrical connections, thereby downsizing the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If separate circuit boards are used for wiring in conventional composite sensors, then electrical connections between detecting elements and signal processing ICs are established, but the sensor size increases and miniaturization is hindered
Solution Approach 1:
The patent merges the circuit board function directly into the housing structure by forming conductive patterns on the inner surface of the housing's bottom wall. This integration eliminates the need for separate circuit boards and reduces the number of wiring components, thereby decreasing overall sensor size while maintaining electrical connection functionality between detecting elements and signal processing ICs
Solution Approach 2:
The housing is designed to serve multiple functions: it provides structural enclosure, acts as a mounting surface for detecting elements, and functions as a circuit board through conductive patterns on its inner surface. This multi-functionality reduces the number of separate components needed, enabling miniaturization while maintaining all necessary electrical connections
2Volume of moving object
If multiple separate components (detecting elements, circuit board, signal processing ICs) are used, then functional requirements are met, but the overall sensor structure becomes bulky
Solution Approach 1:
The patent combines multiple separate components into an integrated structure where the housing serves as both enclosure and circuit board. Detecting elements are mounted directly on the housing's outer surface, and electrical connections are established through conductive patterns on the housing's inner surface, eliminating the need for separate circuit boards and simplifying the assembly process
Solution Approach 2:
The patent utilizes the three-dimensional space within the housing by forming conductive patterns on the inner surface of the bottom wall and using vertical mounting of detecting elements. This spatial arrangement allows electrical connections to be made through the housing thickness rather than requiring lateral wiring on separate circuit boards, enabling compact integration
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 solution results in a compact composite sensor that effectively processes angular velocity and acceleration signals without the bulkiness of conventional designs, enhancing its suitability for use in navigation systems of aircrafts and vehicles.
Implementation Method 1
When element 41 rotates at angular velocity ω on the center axis (detecting axis) along the longitudinal direction, Coriolis force F=2 mv×ω is generated on first arm section 41A and second arm section 41B
Implementation Method 2
Piezoelectric layer 44 is formed of a thin film of lead zirconate titanate (PZT) on the top face of common GND electrode 43
Data Source
AI summary
A composite sensor for detecting angular velocity and acceleration includes an angular velocity detecting element, an acceleration detecting element, an angular velocity signal processing IC, an acceleration signal processing IC, and a housing. The housing is formed of a multilayered circuit board and accommodates the angular velocity detecting element, the acceleration detecting element, the angular velocity signal processing IC, and the acceleration signal processing IC. The housing connects the angular velocity detecting element electrically to the angular velocity signal processing IC, and also connects the acceleration detecting element electrically to the acceleration signal processing IC.