Catalytic Planarization via Reciprocating Pad Motion
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Solution Overview
Problem
Existing planarization processing methods using catalyst-aided chemical processing are inefficient and costly due to the need for large-diameter pads, which result in high processing times and risk of workpiece damage from excessive rotary force.
Innovation Solution
A method and device where the workpiece and pad with a catalyst layer are brought into contact, with one rotating and the other moving parallel to the surface in a controlled reciprocating motion, allowing for precise planarization without the need for a large-diameter pad, thus minimizing the risk of workpiece damage and reducing processing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large-diameter pad is used for planarization processing, then the processing precision is improved, but the device size increases and processing time is extended
Solution Approach 1:
The invention applies dynamic reciprocating motion to the pad in addition to rotation, enabling effective planarization with a smaller pad diameter. The pad moves back and forth in the radial direction while rotating, creating dynamic contact patterns that achieve uniform processing without requiring the pad to be twice the workpiece diameter as in conventional static rotation methods
Solution Approach 2:
The reciprocating motion of the pad creates periodic contact and separation cycles during planarization processing. This periodic action allows the same pad area to process different regions of the workpiece surface repeatedly, achieving comprehensive coverage and uniform planarization with a smaller pad diameter, thereby reducing both device size and processing time
2Manufacturing precision
If a large-diameter pad is used for planarization processing, then the processing precision is improved, but the device becomes more complex and costly
Solution Approach 1:
The invention replaces the conventional large-diameter rotating pad with a smaller pad that incorporates reciprocating motion capability. This dynamic mechanism allows the smaller pad to achieve the same effective processing area coverage as a much larger stationary pad, thereby simplifying device structure and reducing costs while maintaining processing precision
Solution Approach 2:
The invention adds the reciprocating motion dimension to the traditional rotation motion, transforming the pad's movement from purely rotational (one degree of freedom) to combined rotational and reciprocating motion (two degrees of freedom). This dimensional enhancement allows a smaller pad to achieve comprehensive surface coverage that would otherwise require a much larger pad, reducing device complexity
3Stability of the object's composition
If the workpiece is pressed against the pad surface with back pressure, then processing stability is improved, but the water-adhesion effect causes the workpiece to be pulled toward the pad surface resulting in damage risk
Solution Approach 1:
The invention applies dynamic reciprocating motion to the pad, creating continuous changes in contact pressure and separation during processing. This dynamic action prevents the workpiece from being continuously pulled toward the pad surface by water adhesion, as the periodic separation phases allow the workpiece to return to its holder, maintaining processing stability while eliminating damage risk
Solution Approach 2:
The reciprocating motion mechanism preemptively counteracts the water-adhesion effect by periodically separating the pad from the workpiece surface. This preliminary anti-action prevents the cumulative pulling force from building up to dangerous levels, thereby protecting the workpiece from damage while maintaining stable processing conditions
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 approach enables miniaturization of the processing device, reduces the risk of workpiece damage, and achieves precise planarization while maintaining low processing costs by eliminating the need for large-diameter pads and minimizing circumferential rotary force.
Implementation Method 1
supplying a liquid necessary for a catalytic reaction between a surface of the workpiece and a surface of the pad that are in contact with or in proximity to each other
Implementation Method 2
supplying a liquid necessary for the catalytic reaction between the surface of the workpiece and the surface of the pad that are in contact with or in proximity to each other
Data Source
AI summary
A method for planarizing a workpiece includes bringing a surface of the workpiece and a surface of a pad having a catalyst layer at least on the surface thereof into contact with or proximal to each other, rotating a first one of the workpiece and the pad in a plane of the surface of the first one around a central axis that intersects the surface of the first one while supplying a liquid that supports a catalytic reaction between the surface of the workpiece and the catalyst layer on the surface of the pad, and simultaneously reciprocally moving a second one of the workpiece and the pad in a direction parallel to the surface of the second one by at least an amount that makes possible planarization of the surface of the workpiece based on the catalytic reaction.