Polishing Pad Replacement Mechanism for Semiconductor Manufacturing
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Solution Overview
Problem
Conventional polishing apparatuses face significant downtime and reduced yield rates due to lengthy pad replacement times, wastefulness of damaged pads, and potential damage to the polishing head during manual pad replacement, which limits flexibility in semiconductor manufacturing processes.
Innovation Solution
The implementation of a polishing apparatus with first and second clamping elements and a pad-replacing box allows for automated and tool-free replacement of polishing pads, reducing replacement time and increasing pad utilization efficiency while preventing damage to the polishing head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual pad replacement is used with tools, then the polishing pad can be removed, but the polishing head may be damaged and replacement time is long
Solution Approach 1:
The patent introduces a pad replacement tool as an intermediary device that clamps the polishing pad and enables tool-free removal. This mediator transfers the removal force from the operator to the pad without directly contacting the polishing head, preventing damage while facilitating quick replacement
Solution Approach 2:
The patent extracts the polishing pad removal function from the polishing head system by using a separate replacement tool. The pad is removed through the replacement tool's clamping and pulling action, separating the removal process from the polishing head to prevent damage to the head
2Strength
If adhesive is used to attach polishing pad, then the pad is firmly fixed, but the replacement process becomes complex and time-consuming
Solution Approach 1:
The patent extracts the attachment mechanism from adhesive-based bonding to a mechanical interlocking system. The replacement tool clamps the pad and pulls it off without needing to dissolve or remove adhesive, simplifying the replacement process while maintaining firm attachment during operation
Solution Approach 2:
The patent segments the pad attachment and removal functions: during polishing, the pad is firmly attached to the head; during replacement, the replacement tool provides a separate mechanical interface to clamp and remove the pad without affecting the attachment mechanism
3Manufacturing precision
If polishing pad is replaced when worn out, then polishing quality is maintained, but the pad and apparatus are underutilized
Solution Approach 1:
The patent enables the polishing apparatus to serve itself by implementing quick pad replacement that minimizes downtime. The simplified replacement process allows the apparatus to rapidly return to operation, maximizing its productive utilization while maintaining polishing quality through timely pad changes
Data Source
AI summary
A polishing apparatus and a pad replacing method thereof are provided. The polishing apparatus includes a first clamping element, a second clamping element and a polishing head. The first clamping element includes a first upper clamper and a first lower clamper for clamping a first area of a first polishing pad. The second clamping element includes a second upper clamper and a second lower clamper for clamping a second area of the first polishing pad, the first area and the second area are opposite to each other. When the first polishing pad will be disconnected from the bottom surface of the polishing head and replaced by a second polishing pad, the first clamping element and the second clamping element are released from the first polishing pad.