Acoustic Transducer Unit with Embedded Shielding and Inverted Mounting
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Solution Overview
Problem
Existing acoustic transducer units face challenges in reducing size and height due to the need for wiring space, complex and costly multilayer substrates, and manufacturing complexities that lead to performance variations.
Innovation Solution
An acoustic transducer unit design featuring a first member with an embedded electromagnetic-shielding member and terminal members, formed by insert molding, which reduces size and height while simplifying manufacturing and reducing costs, with a second member providing conductivity and an acoustic path to prevent foreign matter entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the element is mounted face up on a multilayer substrate, then the electrical connection is established, but the size and height cannot be reduced due to wiring space requirements
Solution Approach 1:
The patent inverts the conventional mounting orientation by mounting the acoustic transducer element face down on the substrate. This inversion eliminates the need for wiring space above the element, allowing direct electrical connection through the substrate and enabling significant reduction in the overall size and height of the acoustic transducer unit.
2Reliability
If the multilayer substrate and cap member are made to have electromagnetic shielding function, then the electromagnetic sealing is improved, but the structure becomes complex and costs increase due to plating treatment
Solution Approach 1:
The patent merges the electromagnetic shielding function into a separate dedicated shield member that is positioned between the substrate and the cap member. This consolidation approach provides effective electromagnetic sealing without requiring complex multilayer substrate structures or plating treatments on the cap member, thereby reducing structural complexity and manufacturing costs.
3Reliability
If the acoustic path is formed in the multilayer substrate, then the acoustic communication is established, but the manufacturing method becomes complex and performance variation increases due to adhesive seepage or deformation
Solution Approach 1:
The patent extracts the acoustic path formation from the multilayer substrate manufacturing process. Instead of forming the acoustic path within the substrate during its fabrication, the acoustic path is created as a separate cavity or channel in the housing structure, allowing independent optimization of substrate manufacturing and acoustic path formation, thereby reducing manufacturing complexity and performance variation.
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 allows for a compact acoustic transducer unit with improved sealing and sensitivity characteristics, reduced manufacturing costs, and enhanced acoustic performance by eliminating unnecessary volume and complex substrate formation.
Implementation Method 1
an electromagnetic-shielding member disposed inside the body and having conductivity
Implementation Method 2
an acoustic path communicating between the internal space and an external space of the housing
Data Source
AI summary
An acoustic transducer unit includes a first member having a recess, and a plate-like second member having main surfaces. The second member is bonded to the first member so as to cover the recess and form a housing. A microphone element, which is an acoustic transducer, is accommodated in an internal space of the housing, and an acoustic path is provided between the internal space and an external space of the housing. A conductive electromagnetic-shielding member and terminal members for electrically connecting the microphone element and an external circuit are embedded in a resin body of the first member by insert molding. An electromagnetic shield layer of the second member is electrically connected to the electromagnetic-shielding member.