Non-Planar Polycrystalline Diamond Speaker Dome Thickness Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Non-planar diamond speaker domes with varying thickness suffer from reduced breakup frequency and mechanical integrity issues, leading to potential cracking and weakness, which impairs their performance in handling a wide range of frequencies.
Innovation Solution
A non-planar polycrystalline CVD diamond body with a controlled radius of curvature and segment angle is fabricated using a microwave plasma CVD process, ensuring a reduced variation in thickness and enhanced mechanical handling, while maintaining an adequate breakup frequency, by growing the diamond on a substrate with specific dimensions and using careful processing techniques to achieve uniform thickness and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the diamond diaphragm is made thinner to reduce mass and improve flexibility, then the breakup frequency increases, but the mechanical integrity and strength decrease significantly
Solution Approach 1:
The patent applies local quality by varying the thickness of the diamond diaphragm at different locations. The apex region is made thicker (3-10 μm) to provide structural strength and resistance to cracking, while the peripheral regions are made thinner (1-3 μm) to reduce mass and increase flexibility. This non-uniform thickness distribution allows the diaphragm to achieve both high breakup frequency and adequate mechanical integrity.
2Adaptability or versatility
If the diamond diaphragm has variable thickness to handle wider frequency range, then the frequency response improves, but the manufacturing precision and uniformity deteriorate
Solution Approach 1:
The patent implements local quality by creating specific thickness zones: a thicker apex region (3-10 μm) for structural stability and a thinner peripheral region (1-3 μm) for flexibility. This controlled variation in thickness at different locations enables the diaphragm to respond effectively across a wider frequency spectrum while maintaining manufacturability through CVD processes.
Solution Approach 2:
The patent applies parameter changes by systematically varying the thickness parameter across different regions of the diaphragm. The apex thickness is controlled at 3-10 μm while the periphery is controlled at 1-3 μm. This controlled parameter variation optimizes both the frequency response and the feasibility of manufacturing through chemical vapour deposition techniques.
3Speed
If the diamond diaphragm is made thinner to reduce mass, then the breakup frequency increases, but the risk of cracking and pinholes increases
Solution Approach 1:
The patent applies local quality by making the apex region thicker (3-10 μm) to provide structural reinforcement and resistance to cracking, while keeping the peripheral regions thinner (1-3 μm) to maintain flexibility. This localized thickening at the apex prevents cracking in the most critical area where cracks would propagate most easily, while still allowing the overall diaphragm to be thin enough for high-frequency operation.
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 diamond speaker dome with improved breakup frequency and mechanical integrity, capable of handling a wider range of frequencies without significant thickness variation, thus enhancing sound reproduction quality and durability.
Implementation Method 1
growing the diamond on a substrate with specific dimensions and using careful processing techniques to achieve uniform thickness and quality
Implementation Method 2
fabricated using a microwave plasma CVD process
Data Source
AI summary
A non-planar chemical vapour deposition polycrystalline diamond body has a dome body having an apex and an outer periphery. The dome body has an average radius of curvature in a range of 4 mm to 25 mm and a maximum linear dimension at the outer periphery of the dome body of no more than 26 mm. The average radius of curvature is no less than 0.6 times the maximum linear dimension at the outer periphery. A method of fabricating the non-planar diamond body is also disclosed.