Cup Plating Paddle Magnetic Support to Prevent Sagging
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Solution Overview
Problem
In cup type plating apparatuses, the central portion of the paddle tends to hang down due to gravity, leading to potential interference with ionically resistive elements and particle generation.
Innovation Solution
The plating apparatus incorporates a paddle with a first magnet at its distal end and a second magnet opposed to it in the plating tank, which exert a magnetic force to lift the central portion of the paddle, keeping it close to the substrate surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnets are disposed at the distal end portion of the paddle and plating tank to support the distal end portion, then the distal end portion is stabilized, but the central portion of the paddle hangs down due to gravity
Solution Approach 1:
A third magnet is introduced as an intermediary element positioned between the base end portion and the central portion of the paddle. This intermediary magnet, working in conjunction with the fourth magnet on the ionically resistive element, creates a magnetic force that lifts the central portion of the paddle, preventing it from hanging down while maintaining the stability provided by the other magnets.
Solution Approach 2:
The magnetic force generated by the third and fourth magnets acts as a counterbalancing force against gravity. This magnetic lift force compensates for the gravitational pull on the central portion of the paddle, effectively creating an anti-gravity effect that prevents the paddle from sagging while the other magnets provide structural stability.
2Shape
If the central portion of the paddle hangs down, then gravity acts on the paddle structure, but the paddle interferes with ionically resistive elements and generates particles
Solution Approach 1:
The third and fourth magnets are positioned in advance to create a magnetic field that preemptively counteracts gravity on the central portion of the paddle. This preliminary magnetic support prevents the paddle from ever reaching a position where it would interfere with ionically resistive elements or generate particles, rather than correcting the problem after it occurs.
3Ease of operation
If base end portion is physically supported, then the paddle can be reciprocated, but the central portion sags under gravity
Solution Approach 1:
The mechanical support system is augmented with a magnetic field-based support system. Instead of relying solely on physical mechanical support at the base end, magnetic forces from the third and fourth magnets provide distributed support along the paddle length, eliminating sagging while preserving the mechanical reciprocation capability driven by the base end support.
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
This configuration effectively suppresses the central portion of the paddle from hanging down, preventing interference with ionically resistive elements and reducing particle generation, while maintaining efficient stirring of the plating solution.
Implementation Method 1
The first magnet and the second magnet are configured to exert a magnetic force on one another so as to cause a central portion between the base end portion and a distal end portion of the paddle to approach the surface to be plated of the substrate
Data Source
AI summary
To suppress a central portion of a paddle from hanging down in a cup type plating apparatus.A plating apparatus includes a plating tank 410 for housing a plating solution, an anode disposed inside the plating tank 410, a substrate holder configured to hold a substrate Wf with a surface to be plated Wf-a facing downward, a paddle 460 disposed between the anode and the substrate Wf, a driving mechanism 462 configured to support a base end portion 460A of the paddle 460 and reciprocate the paddle 460 along the surface to be plated Wf-a of the substrate Wf, a first magnet 464 disposed in the paddle 460, and a second magnet 468 disposed to be opposed to the first magnet 464. The first magnet 464 and the second magnet 468 are configured to exert a magnetic force on one another so as to cause a central portion 460C between the base end portion 460A and a distal end portion 460B of the paddle 460 to approach the surface to be plated Wf-a of the substrate Wf.