Multilayer Substrate Converter for Photoacoustic Signal Shielding
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Solution Overview
Problem
Conventional converters used in photoacoustic techniques face challenges in reducing external noise, electrical signal loss, and crosstalk due to the use of film wires and via wires in the backing member, which complicates impedance control and shielding, resulting in lower ultrasonic wave intensity compared to conventional ultrasonic detection.
Innovation Solution
A converter with a piezoelectric section fixed to a multilayer substrate that includes signal wires and a shield portion to electromagnetically shield the signal wires, where the piezoelectric section is inclined relative to the detection surface, effectively reducing signal crosstalk and noise by using a multilayer substrate with alternating signal and ground layers for efficient signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If film wires and via wires in the backing member are used to transmit electrical signals, then the converter structure is simplified, but impedance control becomes difficult and signal crosstalk increases
Solution Approach 1:
The patent introduces a multilayer substrate as an intermediary component between the piezoelectric elements and the external circuitry. This substrate provides a controlled impedance environment with dedicated signal transmission paths, replacing the problematic film wires and via wires while maintaining structural simplicity. The multilayer substrate acts as a mediator that ensures reliable signal transmission without the crosstalk and impedance control issues of the previous approach.
2Measurement precision
If the converter is designed for high sensitivity to detect low-intensity ultrasonic waves, then measurement precision improves, but the converter becomes more susceptible to external noise and electrical signal loss
Solution Approach 1:
The patent converts the potential harm of signal crosstalk and external noise into benefit by implementing a shielding structure within the multilayer substrate. The ground layers are strategically positioned to create electromagnetic shielding that protects the signal lines from external noise while the controlled impedance paths minimize signal loss. This approach transforms the challenging environment into one that actively protects the sensitive measurements.
Solution Approach 2:
The multilayer substrate provides different local qualities for different functions: signal layers for low-impedance signal transmission, ground layers for shielding and reference potential, and power layers for stable power supply. Each layer is optimized for its specific function, creating a locally optimized environment that enhances detection sensitivity while minimizing noise and signal loss.
3Ease of manufacture
If the piezoelectric section is fixed perpendicular to the detection surface, then manufacturing is simpler, but signal transmission accuracy deteriorates due to increased crosstalk and noise
Solution Approach 1:
The patent resolves the contradiction by moving the solution to another dimension - rather than changing the orientation of the piezoelectric section, the multilayer substrate is designed with multiple conductive layers positioned at different heights and orientations. This three-dimensional arrangement of signal and ground layers provides effective shielding and controlled impedance paths without requiring the piezoelectric elements to be oriented differently, thus maintaining manufacturing simplicity while improving signal accuracy.
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 enhances the accuracy and efficiency of signal transmission by minimizing signal loss and crosstalk, improving the detection of low-intensity ultrasonic waves in photoacoustic techniques, allowing for more precise measurement of internal structures.
Implementation Method 1
a piezoelectric section including a plurality of piezoelectric elements that each convert a sound wave detected by a detection surface into one of the electrical signals
Implementation Method 2
a shield portion that electromagnetically shields at least a portion of the signal wires
Implementation Method 3
a periodic temperature change in the measurement target is created by the radiated light, and detecting the ultrasonic waves caused by fluctuation of the measurement target
Data Source
AI summary
Provided is a converter that converts sound waves into electrical signals, comprising a piezoelectric section including a plurality of piezoelectric elements that each convert a sound wave detected by a detection surface into one of the electrical signals; and a multilayer substrate to which the piezoelectric section is fixed. The multilayer substrate includes a plurality of signal wires that correspond respectively to the piezoelectric elements and each transmit the electrical signal output by the corresponding piezoelectric element; and a shield portion that electromagnetically shields at least a portion of the signal wires. The piezoelectric section is fixed to the multilayer substrate such that a surface of the multilayer substrate on which the piezoelectric elements are fixed is inclined with respect to the detection surfaces of the piezoelectric elements.