Interchangeable Spin Chuck with Threaded Base
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spin chuck systems for microelectronic substrates face challenges in securely holding substrates of varying sizes and heights, often requiring specialized tools and parts that can be lost or causing inconsistencies in coating quality due to improper seating and chemical damage.
Innovation Solution
A novel spin chuck system with a base and interchangeable spin chucks that securely attach to a spindle using a threaded connection, ensuring proper seating through visual indicators and requiring a minimum force of 5 in·lbs for removal, allowing for easy adaptation and consistent substrate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a screw mechanism is used to attach the spin chuck to the spindle, then the spin chuck can be securely attached, but specialized tools are required and the screw can be lost causing delays
Solution Approach 1:
The attachment mechanism is divided into two segments: a male threaded portion on the spin chuck and a corresponding female threaded portion on the spindle. This segmentation allows the components to screw together securely while enabling tool-free operation through simple hand-tightening, eliminating the need for specialized tools and lost screws.
Solution Approach 2:
The threaded attachment mechanism serves multiple functions: it provides secure attachment, enables easy installation and removal by hand, and ensures consistent positioning. The universal threaded design allows the same mechanism to work across different spin chuck sizes and configurations.
2Reliability
If o-rings are used to transfer vacuum and hold the spin chuck, then vacuum transfer is achieved, but chemical or wear damage can cause vacuum or process failure
Solution Approach 1:
The patent replaces durable but vulnerable o-rings with a rigid threaded mechanical connection that is resistant to chemical and wear damage. The threaded interface provides a permanent, tool-free attachment that does not degrade over time like elastomeric seals, eliminating vacuum failures due to chemical or wear damage.
3Adaptability or versatility
If different spin chucks are machined to different heights, then various substrate sizes can be accommodated, but variations in coating quality and thickness occur
Solution Approach 1:
The system allows dynamic adjustment of spin chuck height through the threaded attachment mechanism. Each spin chuck can be independently adjusted to the correct height by screwing it onto the spindle until it reaches the proper position, ensuring consistent coating quality across different substrate sizes without requiring precision machining to different fixed heights.
Solution Approach 2:
The patent incorporates visual indicators (such as colored rings or markings) on the spin chucks and spindle that change appearance or align when the spin chuck is at the correct height. This allows operators to quickly verify proper seating and height alignment, ensuring consistent coating quality across different substrate sizes.
4Reliability
If a recessed area is created in the center of the spin chuck for vacuum transfer, then vacuum can be pulled across the substrate, but a dimple is created in the center of the substrate
Solution Approach 1:
The patent removes the recessed area from the spin chuck design and replaces it with a flat surface that interfaces with the substrate. Vacuum transfer is achieved through the threaded connection between the spin chuck and spindle, eliminating the need for a central recess that would create a dimple in the substrate.
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
The system enables secure and consistent spin coating of substrates of various sizes and shapes without the need for specialized tools, reducing delays and inconsistencies in coating quality by providing a visually confirmable seating mechanism and ensuring consistent substrate positioning.
Implementation Method 1
The spin chuck has upper and lower sides, with the upper side being configured to support a substrate, and the lower side being removably connected to the base upper end. The spin chuck is not removable from the base by a force of less than about 5 in·lbs being applied to one of the spin chuck and base.
Implementation Method 2
Vacuum is transferred to the substrate via grooves or holes in the spin chuck that are connected to a vacuum source, usually through an opening in the spindle of the spin coater.
Data Source
AI summary
A novel interchangeable spin chuck system is provided that allows the user to quickly change substrate sizes and spin chuck styles without any extra tools. This system has a two-piece design and overcomes many of the drawbacks of previous spin chuck designs, such as difficulty in seating the spin chuck and ensuring that the spin chuck is at a consistent flatness and height. Furthermore, this spin chuck system allows the spin chucks to be manufactured at a lower cost. Thus, rather than restricting users to “make do” with incorrect spin chucks due to budget limitations, this economical design gives users access to a wider range of spin chuck sizes and styles.