Acoustic Transducer Segmented Vibratile Portion
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Solution Overview
Problem
Conventional acoustic transducers suffer from reduced sensitivity and signal-to-noise ratio due to uneven deformation of the vibrating membrane, which is exacerbated by the central part deforming more than the peripheral part, leading to a smaller effective sensing area.
Innovation Solution
Incorporating a positioning member connected to the vibrating membrane and surrounding elastic members to restrict central deformation, allowing the vibratile portion to perform nearly parallel vertical vibrations, thereby increasing rigidity without altering the membrane's thickness or dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the vibrating membrane is increased to prevent arched deformation, then the rigidity of the vibrating membrane is improved, but the manufacturing process complexity and manufacturing cost increase
Solution Approach 1:
The vibrating membrane is segmented into a central vibratile portion and a peripheral fixed portion by the positioning member. This segmentation allows the central portion to maintain higher rigidity through reduced deformable width while the peripheral portion remains fixed, preventing arched deformation without requiring increased overall thickness throughout the membrane.
Solution Approach 2:
The positioning member creates a local structural modification at the center of the vibrating membrane, reducing the deformable width specifically in the vibratile portion. This local quality change increases rigidity where needed without altering the overall membrane thickness or dimensions, avoiding increased manufacturing complexity.
2Strength
If the total area of the vibrating membrane is reduced to increase rigidity, then the rigidity is improved, but the effective sensing area is further reduced, negatively impacting sensitivity
Solution Approach 1:
The vibrating membrane is divided into a central vibratile portion and a peripheral fixed portion. The vibratile portion has a smaller deformable width which increases its rigidity, while the overall working area of the membrane is maintained. This segmentation ensures that the effective sensing area is maximized within the vibratile portion without compromising rigidity.
Solution Approach 2:
The positioning member creates a local structural modification that increases rigidity in the central vibratile portion by reducing its deformable width. This local quality change allows the central portion to perform parallel movement without arching, while the peripheral portions contribute to the overall sensing area, thus maintaining a large effective sensing area while improving rigidity where needed.
3Strength
If the deformable width of the vibratile portion is reduced, then the rigidity is increased and parallel movement is achieved, but the structural complexity increases due to additional positioning members and elastic members
Solution Approach 1:
The positioning member segments the vibrating membrane into distinct vibratile and fixed portions, creating a clear boundary that defines the reduced deformable width. This segmentation is achieved through simple structural elements (positioning member and elastic members) that are integrated into the existing transducer structure, minimizing additional complexity while achieving the desired rigidity increase.
Solution Approach 2:
The elastic members act as intermediaries between the positioning member and the vibrating membrane. These elastic members provide the necessary support and constraint to achieve parallel movement and increased rigidity in the vibratile portion, while their elastic nature allows for simple integration without requiring complex rigid structures. The intermediary elements simplify the overall structural design by providing flexible yet effective constraint.
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 acoustically receiving sensitivity and signal-to-noise ratio while maintaining process stability and reducing manufacturing costs by ensuring even deformation and movement of the vibratile portion.
Implementation Method 1
the elastic members deform prior to the vibratile portion, in order to enable the vibratile portion perform vertical vibration
Implementation Method 2
the vibrating membrane 83 vibrates and changes its distance from the electrode unit 85, causing change of capacitance
Data Source
AI summary
An acoustic transducer with high sensitivity includes a base plate, a back plate and a vibrating membrane. The vibrating membrane is peripherally fixed to the base plate and covers an opening of the base plate. The back plate has a positioning member connected between the back plate and the vibrating membrane, so as to define at least one vibratile portion that is arranged annularly by a plurality of elastic members. Thereby, the vibratile portion has a reduced deformable width and increased rigidity, so can effectively improve its acoustically receiving sensitivity and signal-to-noise ratio.