Rotating Plating Fixture for Uniform Electroforming in Deep Cavities
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Solution Overview
Problem
Long plating times and turbulent flow in electroforming processes lead to non-uniform plating in deep cavities, which affects the efficiency and quality of the electroplating process.
Innovation Solution
A rotating plating fixture with a stepper motor, bevel gear, and substrate holder system that controls the orientation and rotation of the substrate during electroplating, using a controller to manage the rotation speed and direction to minimize turbulence and ensure uniform plating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If long plating times are used to fill deep cavities with electroformed structures, then the cavity filling is improved, but turbulent flow causes adverse effects on plating height variation
Solution Approach 1:
The patent applies the Dynamics principle by rotating the substrate holder during electroplating to change the orientation of deep cavities relative to the plating bath. This dynamic movement prevents stagnant turbulent flow in deep cavities while maintaining uniform plating deposition, resolving the contradiction between achieving complete cavity filling and maintaining plating height uniformity.
2Quantity of substance
If turbulent flow is present during plating, then material transport is improved, but plating height variation is exacerbated
Solution Approach 1:
By continuously rotating the substrate holder, the system dynamically changes the orientation of cavities and surfaces relative to the plating bath, preventing stagnant turbulent flow patterns while ensuring uniform material distribution. This maintains adequate material transport without exacerbating plating height variation.
3Manufacturing precision
If the substrate remains stationary during plating, then the setup is simple, but non-uniform plating occurs in deep cavities
Solution Approach 1:
The patent introduces a rotating substrate holder mechanism that dynamically changes substrate orientation during plating. This relatively simple rotational movement achieves uniform plating in deep cavities without requiring complex multi-axis positioning systems or multiple fixtures.
Solution Approach 2:
The rotating substrate holder serves multiple functions: it prevents stagnant flow in deep cavities, ensures uniform plating deposition, and can accommodate various substrate configurations. This single multi-functional component achieves uniform plating without requiring multiple specialized fixtures.
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 system achieves uniform plating across deep cavities by reducing turbulent flow, thereby improving the efficiency and quality of the electroplating process.
Implementation Method 1
In order to fill deep cavities with electroformed structures, long plating times are required
Data Source
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Figure 1C
AI summary
A rotating plating fixture changes an orientation of the substrate throughout a plating cycle. The plating fixture changes the orientation by precisely controlling a rotation speed and position of the substrate. A stepper motor changes the orientation in response to control signals from a controller. The plating fixture includes a stepper motor (110) fixed to a hanger (102), a shaft (108) coupled to the stepper motor, a pinion gear (106) coupled to the shaft such that rotation of the shaft by the stepper motor causes rotation of the pinion gear, and a bevel gear (104) meshing with the pinion gear.