Polishing Pad Alignment Feature for CMP Orientation

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Solution Overview

Problem

Conventional polishing pads in chemical mechanical polishing (CMP) lack effective alignment features that persist throughout their polishing life, interfering with pad quality measurements and vacuum application, and do not indicate the orientation in the molding process.

Innovation Solution

Polishing pads with alignment features, such as radial or circumferential segment grooves or interruptions, are designed to be visible and non-interfering, providing traceability and indicating the pad's orientation during manufacturing, while being integrated into the polishing surface without disrupting the pad's functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If conventional polishing pads are used without alignment features, then the polishing surface is uniform and functional, but traceability and orientation indication are lost

Engineering Contradiction:

ImprovetraceabilityVSAvoidpolishing pad structure

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent introduces alignment features with asymmetric geometries (such as radial grooves, circumferential grooves, or interruptions in the groove pattern) that break the rotational symmetry of the polishing pad surface. These asymmetric features serve as unique identifiers that indicate the pad's orientation during manufacturing and provide traceability, while being integrated into the polishing surface without disrupting its overall functionality.

Inventive Principle:

Principle #4Asymmetry

2Loss of information

If alignment features are added to the polishing surface, then traceability and orientation indication are improved, but pad quality measurements and vacuum application may be interfered with

Engineering Contradiction:

Improveorientation informationVSAvoidpolishing performance

Core Design Contradiction:

Loss of informationVSReliability

Solution Approach 1:

The patent applies local quality by concentrating alignment features in specific regions of the polishing pad surface rather than uniformly distributing them across the entire surface. The alignment features are positioned in locations that provide sufficient orientation indication and traceability while minimizing their impact on the overall polishing surface area, ensuring that pad quality measurements and vacuum application are not significantly interfered with.

Inventive Principle:

Principle #3Local quality

3Duration of action of stationary object

If alignment features are integrated into the polishing surface, then persistent traceability is achieved, but the groove pattern complexity increases

Engineering Contradiction:

Improvepolishing pad service lifeVSAvoidgroove pattern

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The patent merges the alignment feature formation with the existing groove patterning process. The alignment features are integrated into the groove pattern through techniques such as varying groove depths, adding supplementary grooves, or creating interruptions in the groove pattern during the same manufacturing process. This merging approach ensures persistent traceability throughout the pad's service life while avoiding the need for separate, complex post-processing steps.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9249273B2Polishing pad with alignment feature

Publication Date: 2016.02.02 CMC MATERIALS INC

AI summary

Polishing pads with alignment marks are described. Methods of fabricating polishing pads with alignment marks are also described.