Electromechanical Transducer Stress Relaxation Layer
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Solution Overview
Problem
Capacitance type electromechanical transducers used for receiving photoacoustic waves face noise issues due to light incidence, leading to degradation in sensitivity and bandwidth, as existing solutions do not effectively manage the stress and deformation caused by light reflection members.
Innovation Solution
Incorporating a stress relaxation layer on the vibration film and a light reflection layer on the stress relaxation layer, with the light reflection layer positioned to prevent light incidence on the receiving face, reducing deformation and maintaining mechanical characteristics, and using a supporting layer to enhance the adhesion and stiffness of the light reflection layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light reflection layer is provided directly on the vibration film to prevent light incidence, then light blocking effectiveness is improved, but stress and deformation of the vibration film increase causing sensitivity degradation and bandwidth reduction
Solution Approach 1:
A stress relaxation layer is introduced as an intermediary between the light reflection layer and the vibration film. This intermediate layer absorbs and relaxes the stress generated by the light reflection layer, preventing direct stress transmission to the vibration film while maintaining the light blocking function.
Solution Approach 2:
The structure is segmented into distinct functional layers: the vibration film for acoustic wave reception, the stress relaxation layer for stress management, and the light reflection layer for light blocking. This segmentation allows each layer to optimize its specific function without interfering with the others.
2Object-affected harmful factors
If the light reflection layer is made larger to ensure complete light blocking, then light incidence prevention is improved, but deformation dispersion of the vibration film increases
Solution Approach 1:
The stress relaxation layer acts as a buffer that decouples the size mismatch between the light reflection layer and the vibration film, allowing the light reflection layer to be sufficiently large for complete light blocking without causing deformation dispersion in the vibration film.
3Object-affected harmful factors
If the light reflection layer is positioned close to the vibration film to prevent light incidence, then light blocking effectiveness is improved, but stress impact on the vibration film increases
Solution Approach 1:
The stress relaxation layer is positioned between the light reflection layer and the vibration film, allowing the light reflection layer to remain close to the vibration film for effective light blocking while the intermediate layer absorbs the stress impact.
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 reduces noise and maintains sensitivity and bandwidth by minimizing the impact of the light reflection layer on the vibration film, allowing for efficient reception of photoacoustic waves while preventing light from reaching the receiving face, and enabling the transducer to be downsized for easier integration.
Implementation Method 1
a light reflection layer provided on the stress relaxation layer
Implementation Method 2
a capacitance type electromechanical transducer which is used as an ultrasonic transducer... can transmit and receive an acoustic wave such as an ultrasonic wave by using the vibration of a vibration film
Implementation Method 3
a stress relaxation layer provided on the vibration film
Data Source
AI summary
The present invention provides an electromechanical transducer which can prevent light from being incident on a receiving face, without deteriorating mechanical characteristics of a vibration film. The electromechanical transducer has at least one cell 2 in which the vibration film 7 containing one electrode 8 out of two electrodes 3 and 8 that are provided so as to interpose a space 5 therebetween is vibratably supported. The electromechanical transducer has a stress relaxation layer 9 formed on the vibration film 7, which has an acoustic impedance matching that of the vibration film 7, and has a light reflection layer 6 formed on the stress relaxation layer 9.