Piezoelectric Module Segmentation for Ultrasonic Array Wiring
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Solution Overview
Problem
Existing ultrasonic sensors with two-dimensional array structures face complications in wiring due to increased complexity and voltage drop issues, leading to reduced driving accuracy as the distance from the power supply increases, affecting the ability to accurately drive ultrasonic transducers.
Innovation Solution
A piezoelectric module with an element substrate featuring a plurality of piezoelectric bodies arranged in an array, connected by connection electrodes drawn between them, and columnar electrodes connecting these electrodes to an input and output circuit, allowing independent signal input and output, thereby reducing wiring complexity and preventing voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a two-dimensional array structure with multiple ultrasonic transducers is used, then the sensing capability is improved, but the wiring complexity increases
Solution Approach 1:
The patent divides the element substrate into multiple regions, each containing a subset of ultrasonic transducers that can be independently controlled. This segmentation allows different groups of transducers to be driven by separate wiring sets, reducing the overall wiring complexity while maintaining the two-dimensional array sensing capability.
Solution Approach 2:
The patent introduces a new dimension of control by organizing transducers into multiple independently controllable groups. Instead of a single monolithic array, the system uses multi-group independent drive technology where each group can be controlled separately, effectively adding a grouping dimension to the traditional two-dimensional array structure.
2Device complexity
If through electrodes are used to simplify wiring, then the wiring complexity is reduced, but the power supply capability to distant transducers deteriorates
Solution Approach 1:
The patent segments the ultrasonic transducer array into multiple independently controllable groups, where each group has its own dedicated power supply path through through electrodes. This segmentation ensures that each group receives sufficient power without the cumulative voltage drop affecting the entire array, as power is distributed locally to each segment rather than across the whole system.
Solution Approach 2:
The patent introduces intermediate control circuits that act as mediators between the power supply and distant transducers. These intermediate circuits amplify and regulate the drive signals before they reach the transducers, compensating for power loss over distance and ensuring adequate power delivery to all transducer groups.
3Area of stationary object
If multiple transducers are arranged in an array, then the coverage area is improved, but the voltage drop increases reducing driving accuracy
Solution Approach 1:
The patent divides the large-scale transducer array into multiple smaller independent groups, each with its own control circuit. This segmentation limits the distance that drive signals must travel within each group, reducing voltage drop and maintaining driving accuracy across the entire coverage area while still providing extensive spatial coverage through the combined array.
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 enables high-accuracy driving of piezoelectric bodies, reduces the size of the module, and allows for dense disposition of ultrasonic transducers, improving transmission control without the need for acoustic lenses, while maintaining accurate signal transmission and reception.
Implementation Method 1
an element substrate which includes a plurality of piezoelectric bodies arranged in an array
Data Source
AI summary
A piezoelectric module includes an element substrate that includes a plurality of piezoelectric bodies (piezoelectric elements) arranged in an array, and a plurality of connection electrodes (lower connection electrode and upper connection electrode) that are connected to the piezoelectric body (piezoelectric element) and are drawn between the piezoelectric body (piezoelectric element) and an adjacent piezoelectric body (piezoelectric element), an input and output circuit that is provided on one surface side of the element substrate and independently inputs and outputs a signal from and to each of the connection electrodes (lower connection electrode and upper connection electrode), and columnar electrodes (first through electrode and second through electrode) each of which is provided between each of the connection electrodes (lower connection electrode and upper connection electrode) and the input and output circuit and connects each of the connection electrodes (lower connection electrode and upper connection electrode) and the input and output circuit to each other.