Biological Sound Sensor Soft Interface for Noise Suppression
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Solution Overview
Problem
Existing biological sound sensors suffer from noise interference due to the open end of the container contacting the human body, which hinders accurate detection of biological sounds.
Innovation Solution
A biological sound sensor design featuring a diaphragm with a piezoelectric element and a soft member that is softer than the diaphragm, where the soft member contacts the body and the housing is kept away, reducing noise interference by minimizing contact with the body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the container has an open end around the sound wave input surface to allow sound transmission, then sound detection capability is improved, but noise occurs due to contact between the open end and human body surface
Solution Approach 1:
The patent introduces a soft member as an intermediary between the diaphragm and the human body. This soft member has a contact surface that contacts the body and a non-contact surface that bonds to the diaphragm. The intermediary structure allows sound transmission while preventing direct contact between the rigid housing/open end and the body, thereby eliminating noise generation.
Solution Approach 2:
The patent uses a flexible soft member (soft polymer material) that can deform and adapt to the body surface contour. This flexible structure maintains intimate contact with the body for sound transmission while the rigid housing remains separated, preventing noise-generating contact between hard surfaces.
2Object-affected harmful factors
If the soft member is made softer than the diaphragm to improve contact with the body, then noise suppression is improved, but the structural integrity and vibration transmission may be compromised
Solution Approach 1:
The patent carefully controls the hardness parameter of the soft member, making it softer than the diaphragm (Shore A hardness 10-80) to ensure body contact and noise suppression, while maintaining sufficient vibrational coupling. The diaphragm itself has controlled thickness (0.01-0.5mm) and material properties to balance flexibility and strength.
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 design effectively suppresses noise, allowing for accurate detection of biological sounds by ensuring the housing does not contact the body and the soft member accurately transmits vibrations.
Implementation Method 1
a piezoelectric element disposed on the first plate surface of the diaphragm and configured to detect a vibration of the diaphragm
Implementation Method 2
The soft member has a contact surface that is configured to be in contact with a biological body... The soft member is softer than the diaphragm
Data Source
AI summary
A biological sound sensor includes a housing, a diaphragm having a plate shape with a first plate surface and a second plate surface on opposite sides, and a piezoelectric element and a soft member. The diaphragm is vibratable along a thickness direction. The piezoelectric element is on the first plate surface of the diaphragm and is configured to detect a vibration of the diaphragm. The soft member has a contact surface that is configured to contact a biological body and a non-contact surface that is configured to be away from the biological body. The soft member is softer than the diaphragm. In some examples, the housing holds one of the first plate surface or the non-contact surface, and the second plate surface is bonded, from a center to a circumferential edge of the second plate surface, to the non-contact surface of the soft member.