Electroplating Chuck Assembly Segmentation for Remote Maintenance
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Solution Overview
Problem
The frequent maintenance requirements for electrical contacts and seals in electroplating processors reduce the throughput and efficiency of the electroplating process, as these components need frequent cleaning and deplating, causing the processor to be idle during maintenance procedures.
Innovation Solution
A chuck assembly with a built-in contact ring that moves through the electroplating system, allowing maintenance to be performed outside the processor, featuring a ring with electrical contact fingers connected to a ring bus bar, a wafer seal to prevent plating liquid from reaching the contacts, and centering pins for precise alignment with the processor, ensuring secure mechanical and electrical engagement of the wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrical contacts and seals are integrated into the electroplating processor, then the processor can perform electroplating operations, but frequent maintenance is required causing the processor to be idle during cleaning procedures
Solution Approach 1:
The system is divided into two independent parts: a removable chuck assembly containing the contact ring and seal, and the stationary processor. This segmentation allows the chuck assembly to be easily removed for maintenance while the processor continues to operate, resolving the contradiction between productivity and maintenance downtime.
Solution Approach 2:
The contact ring and seal are extracted from the processor and integrated into the chuck assembly that moves with the wafer. This extraction allows maintenance of these components to be performed outside the processor, eliminating the need to idle the processor during cleaning procedures and thus improving throughput.
2Productivity
If the chuck assembly moves with the wafer through the electroplating system, then contact ring maintenance can be performed elsewhere leaving the processor available, but the chuck assembly must be precisely aligned with the processor and securely engage the wafer
Solution Approach 1:
Magnetic attraction is used to replace complex mechanical alignment and securing mechanisms. The magnetic chuck assembly is attracted to and held by the magnetic processor, providing precise alignment and secure engagement without complex mechanical linkages that would require careful alignment.
Solution Approach 2:
The magnetic field strength is adjusted to control the attraction force between the chuck assembly and processor. By changing the magnetic field parameter, the system achieves both precise alignment during operation and easy removal for maintenance, resolving the contradiction between productivity and alignment precision.
3Ease of operation
If the chuck assembly is magnetically attracted to the processor, then alignment and secure engagement are simplified, but the chuck assembly must be easily removable for maintenance
Solution Approach 1:
The magnetic attraction force is made dynamically adjustable, allowing strong attraction during operation for secure engagement and precise alignment, and reduced attraction during maintenance for easy removal. This dynamic control resolves the contradiction between ease of operation and ease of repair.
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 design allows continuous operation of the electroplating processor during maintenance, improving throughput by enabling precise alignment and secure engagement of the wafer, reducing downtime and enhancing efficiency.
Implementation Method 1
The chuck assembly, however, must be precisely aligned with the processor, and must also securely engage the wafer, both mechanically and electrically.
Implementation Method 2
The ring has contact fingers electrically connected to a ring bus bar, and with the ring bus bar electrically connected to a power source in the processor via the backing plate
Implementation Method 3
an electrical field causes metal ions in the plating liquid to plate out onto the wafer, forming a metal layer
Implementation Method 4
A wafer seal on the ring overlies the contact fingers
Data Source
AI summary
A wafer is placed into a chuck assembly within an electroplating system. The chuck assembly includes a backing plate assembly engageable with a ring. A hub may be provided on one side of the backing plate assembly for attaching the chuck assembly to a rotor of a processor for electroplating a wafer. A wafer plate may be provided on the other side of the backing plate assembly. The ring has contact fingers electrically connected to a ring bus bar, and with the ring bus bar electrically connected to a power source in the processor via the backing plate assembly when the ring is engaged to the backing plate assembly. A wafer seal on the ring overlies the contact fingers. A chuck seal may be provided around a perimeter. Maintenance of the electrical contacts and the seal is performed remotely from the processors.