MEMS Microphone Shield Case with Thickened Side Plates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Miniaturization of MEMS microphones has reduced the size and thickness of shield cases, making it difficult to secure adequate areas for gasket adherence and chucking while maintaining airtightness and structural integrity, leading to potential sound signal leakage and weak adhesive strength.
Innovation Solution
A shield case design with thicker side plates than the top plate, featuring a cornered bent portion and R-shaped end portions, allows for increased gasket adherence area and improved solder fixation without altering the chucking area's position or size, enhancing airtightness and structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the shield case is miniaturized to reduce size and thickness, then the overall dimensions are reduced, but the area for gasket adherence and chucking becomes insufficient
Solution Approach 1:
The shield case employs varying thickness across different regions: the top plate maintains a first thickness while the side plates have a greater second thickness. This local quality differentiation allows the side plates to provide sufficient gasket adherence area and structural support even when the overall case size is miniaturized, resolving the contradiction between reduced volume and maintained adherence area.
2Volume of moving object
If the shield case thickness is reduced for miniaturization, then the overall size is reduced, but the structural integrity and adhesive strength become weak
Solution Approach 1:
The side plates are designed with greater thickness than the top plate, creating local structural reinforcement. This thicker configuration in critical areas maintains adhesive strength and structural integrity while allowing the overall case to be miniaturized, as the increased thickness is localized only where needed for strength.
3Reliability
If the gasket adherence area is increased to secure airtightness, then the distances from sound hole to end portions must be increased, but the chucking area becomes limited
Solution Approach 1:
By concentrating the increased thickness in the side plates rather than uniformly increasing all dimensions, the design allows sufficient distance from the sound hole to the end portions for gasket adherence while preserving chucking area. The localized thickness enhancement provides the necessary adherence area without expanding the overall footprint that would encroach on the chucking region.
Data Source
AI summary
To provide a shield case and an MEMS microphone having the shield case which can secure on a top plate the minimum distance for adhering with a gasket in a view point of airtightness.The shield case according to the invention is a shield case for shielding an MEMS chip mounted on a board from the outside, which includes a top plate and a plurality of side plates and the thickness of each of the plurality of side plates is larger than that of the top plate. According to this configuration, the area of the top plate can be made larger as compared with a conventional shield case having a uniform thickness. Thus, the area for adhering the gasket to the top plate can be secured without changing the position, size and range etc. of the chucking area from those of the conventional shield case.