Diaphragm Assembly Stiffening via Frame Bending
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Solution Overview
Problem
Existing diaphragm assemblies for miniature acoustical transducers face challenges in achieving both sufficient audio performance and ruggedness for handling, as frames made of aluminum are too fragile, while using nickel requires glue, which is difficult to apply accurately and leads to manufacturing complexities.
Innovation Solution
A diaphragm assembly with a movable element made of a material like aluminum and a frame with a higher Young's modulus, where the frame is stiffened by bending or adding a stiffening element, allowing for integral construction without the need for glue, ensuring both audio performance and handling robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a frame is made of aluminum with the same thickness as the movable element, then the diaphragm assembly achieves good audio performance with lightweight construction, but the frame becomes too fragile for handling during manufacture and assembly
Solution Approach 1:
The frame is designed with non-uniform thickness, having a first thickness in the region connecting to the movable element and a second, greater thickness in the region forming the hinge. This local variation in quality allows the frame to be lightweight where strength is sufficient while providing enhanced strength where needed for handling and hinge formation.
Solution Approach 2:
The hinge portion of the frame extends in a direction substantially perpendicular to the plane of the movable element, creating a three-dimensional structure. This dimensional change provides structural strength and rigidity for handling while maintaining the overall lightweight design of the diaphragm assembly.
2Strength
If a nickel frame is used instead of aluminum, then the frame becomes sufficiently strong for handling, but glue is required as a connection element which makes the manufacturing complicated and error-prone
Solution Approach 1:
The hinge and the frame are formed as a single integral piece from the same sheet material, eliminating the need for separate connection elements like glue. This merging of components simplifies manufacturing by allowing the entire diaphragm assembly to be formed from a single sheet in one operation, significantly improving ease of manufacture.
Solution Approach 2:
The frame's own material is used to form the hinge portion, allowing the structure to create its own connection mechanism without external materials. The hinge is self-formed from the frame material itself, eliminating dependency on additional components or assembly steps.
3Strength
If the frame is made thicker to increase strength, then the frame becomes robust for handling, but the gap between the frame and movable element increases, potentially deteriorating the acoustic properties
Solution Approach 1:
The frame thickness is optimized locally: it is thicker in the hinge region for structural strength and handling, while maintaining appropriate thickness in other regions to control the gap dimensions. This localized quality variation allows simultaneous achievement of mechanical strength and acoustic performance.
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 provides a diaphragm assembly that is both lightweight and stiff, enabling effective audio performance while being robust enough for handling and assembly, without the complications of glue application, by using a frame with increased stiffness through bending or additional stiffening elements, made from the same material as the movable element.
Implementation Method 1
a diaphragm assembly (20) comprising a movable element (24) and a frame (26) wherein the frame (26) comprises a first portion (261, 262) connected to the movable element (24) and outer portions (262) bent at least substantially at an angle to a plane defined by the movable element (24)
Data Source
Figure 1~3C
Figure 4~5
Figure 6~8
AI summary
A diaphragm assembly for a miniature acoustical transducer having a sufficiently light paddle to allow good audio performance and a sufficiently stiff frame to allow handling. The paddle may be made of a thin sheet of aluminium and the frame of thicker aluminium or a bent sheet of aluminium.