Composite Sensor Terminal Segmentation for Noise Isolation
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Solution Overview
Problem
Existing composite sensors face detection accuracy deterioration due to electrical noise, particularly when the input and output terminals of acceleration and angular velocity sensors are in close proximity, leading to interference between their signals.
Innovation Solution
The sensors are arranged such that input terminals for noise-prone signals are on one side of a virtual line, and output terminals susceptible to noise are on the other side, with a circuit board connecting them, to isolate the adverse effects of input signals on output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the acceleration sensor and angular velocity sensor are mounted close to each other on a common mount member, then the device size is reduced and integration is improved, but detection accuracy deteriorates due to electrical noise interference between input and output terminals
Solution Approach 1:
The mount member is divided into multiple regions by a virtual line, with input terminals placed in one region and output terminals in another. This spatial segmentation separates noise-generating input signals from noise-sensitive output signals, reducing electrical interference while maintaining compact integration of both sensors on the same mount member.
Solution Approach 2:
A virtual line acts as an intermediary boundary that defines the spatial relationship between input and output terminals. This conceptual mediator organizes the terminal placements to ensure proper separation without requiring physical barriers or complex shielding structures.
2Device complexity
If input terminals of sensors are placed close to output terminals for compact wiring, then connection complexity is reduced, but signal integrity deteriorates due to noise coupling
Solution Approach 1:
The terminal placement is segmented into distinct zones separated by a virtual line on the mount member surface. Input terminals occupy one zone while output terminals occupy another, creating natural spatial separation that reduces electromagnetic coupling and noise interference without complicating the wiring architecture.
Solution Approach 2:
Different regions of the mount member are assigned different functional qualities: one region is optimized for input terminal placement (noise tolerance), while another region is optimized for output terminal placement (noise sensitivity). This local differentiation of functional zones ensures signal integrity while maintaining overall compactness.
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 effectively restricts the deterioration of detection accuracy by separating noise sources from sensitive output terminals, enhancing the overall performance of the composite sensor system.
Implementation Method 1
The angular velocity sensor is of, for example, a piezoelectric type using a piezoelectric effect of a piezoelectric body. During a vibrating state of a drive vibrating reed, the angular velocity sensor outputs a sensor signal (electric charges) corresponding to an angular velocity applied to the sensor.
Implementation Method 2
a capacitive acceleration sensor has a movable electrode and a fixed electrode opposing the movable electrode and either one of the movable electrode and the fixed electrode has predetermined amplitude and frequency. That is to say, an input signal (carrier wave) is applied to the one electrode, and acceleration is detected according to electric charges (sensor signal) generated at the other electrode.
Data Source
AI summary
A composite sensor includes a first sensor outputting a first sensor signal, a second sensor outputting a second sensor signal, a circuit board electrically connected to the first and second sensors, and a mount member having one surface on which the first and second sensors and the circuit board are disposed. The first and second sensors have respective input terminals to which respective input signals are inputted, and have respective output terminals from which the first and second sensor signals are outputted. When a virtual straight line passing respective centers of the first and second sensors parallel to an arrangement direction of the sensors is defined, the respective input terminals of the first and second sensors are disposed in one of two regions divided by the virtual line, and the respective output terminals of the first and second sensors are disposed in a remaining one of the two regions.