Micromechanical Sensor Packaging With Through-Opening Acoustic Sealing
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Solution Overview
Problem
Existing semiconductor devices with micromechanical components face challenges in manufacturing efficiency and are prone to acoustic leakage paths, which affect yield and sensitivity of pressure and sound detection.
Innovation Solution
The semiconductor device integrates a micromechanical component into a through-opening of an injection-molded body, forming an airtight and gas-tight contact with the lateral wall, allowing overmolding to create a robust structure that prevents acoustic leakage and enables high sensitivity pressure and sound detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the micromechanical component is integrated into the injection-molded body with overmolding, then manufacturing cost and complexity are reduced, but acoustic leakage paths may form affecting detection sensitivity
Solution Approach 1:
The housing is divided into two functional parts: the injection-molded body providing structural support and the separate micromechanical component providing the sensing function. This segmentation allows each component to be optimized independently while reducing overall manufacturing complexity through integration.
Solution Approach 2:
An acoustic seal layer is introduced as an intermediary element between the micromechanical component and the housing. This specialized layer ensures acoustic sealing without requiring complex mechanical bonding, thus maintaining reliability while simplifying the manufacturing process.
2Productivity
If standard semiconductor manufacturing techniques are used, then manufacturing cost and productivity increase, but acoustic leakage paths may occur reducing yield
Solution Approach 1:
The manufacturing process parameters are optimized to include specific acoustic sealing steps. The acoustic seal layer is applied with controlled thickness and material properties to ensure acoustic sealing while maintaining compatibility with standard semiconductor manufacturing techniques, thus achieving high productivity without compromising reliability.
3Measurement precision
If the micromechanical component is tightly sealed to prevent acoustic leakage, then detection sensitivity improves, but manufacturing precision requirements increase
Solution Approach 1:
An acoustic seal layer in the form of a flexible thin film is used to create the sealing interface. This flexible film can conform to slight variations in the micromechanical component surfaces, achieving effective acoustic sealing without requiring extremely tight manufacturing tolerances, thus maintaining high detection sensitivity while reducing manufacturing precision requirements.
4Measurement precision
If the deformable membrane is allowed to deform freely for pressure measurement, then measurement precision improves, but acoustic leakage paths may form
Solution Approach 1:
The acoustic seal layer serves as a mediator that allows the deformable membrane to move freely for pressure measurement while preventing acoustic leakage. The seal layer is positioned to accommodate membrane deformation without creating leakage paths, thus maintaining both measurement precision and acoustic sealing.
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 solution results in a cost-effective manufacturing process with increased yield and sensitivity, reducing the risk of acoustic leakage and allowing for sensitive membrane deformation without counter-pressure, enhancing the performance of pressure and sound sensors.
Implementation Method 1
a pressure difference between the pressure p in the interior space 12 and the reference pressure p0 should be measurable by means of a voltage or capacitance applied between the deformable membrane 24 and an associated counter electrode 26
Data Source
AI summary
A semiconductor device. The semiconductor device includes a micromechanical component, an injection-molded body with at least one recess formed on the injection-molded body, which is framed by a lateral wall region of the injection-molded body and is at least partially covered by a base region of the injection-molded body on a first side of the recess, and a lid which is fastened directly or via at least one intermediate component to the lateral wall region and covers the recess on its second side. A through-opening is formed on the base region of the injection-molded body. The at least one lateral wall of which extends from the recess to an outer base surface of the base region faces away from the recess. The micromechanical component is arranged in the through-opening such that the micromechanical component mechanically contacts the at least one lateral wall of the through-opening.