Lower-Surface Brush Cleaning Mechanism for Substrate Processing
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Solution Overview
Problem
The cleanliness of a brush in substrate cleaning devices degrades over time, leading to inefficient cleaning of substrates, and it is challenging to maintain brush cleanliness without reducing throughput.
Innovation Solution
A substrate cleaning device is designed with a substrate holder, a lower-surface brush for cleaning the substrate's lower surface, a brush cleaner for maintaining the brush's cleanliness, and a lifting-lowering driver that moves the brush between a processing position and a waiting position overlapping with the substrate in the up-and-down direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a brush is used to clean the lower surface of a substrate, then cleaning effectiveness is improved, but brush cleanliness degrades over time requiring maintenance that reduces throughput
Solution Approach 1:
The brush cleaner is positioned to clean the brush before it contacts the substrate, preventing contamination buildup that would require interrupting the cleaning process. This preliminary cleaning action maintains brush effectiveness without reducing substrate processing throughput.
Solution Approach 2:
A separate brush cleaner component acts as an intermediary device that maintains the cleanliness of the lower-surface brush. This mediator allows the brush to be cleaned independently without interrupting the substrate cleaning cycle, resolving the conflict between maintaining cleaning effectiveness and preserving throughput.
2Productivity
If a relatively large lower-surface brush is used to clean the substrate efficiently, then cleaning speed is improved, but device footprint increases
Solution Approach 1:
The brush cleaner is positioned in the vertical dimension below the substrate holding position rather than expanding the horizontal footprint. This allows a large brush to be used for efficient cleaning while the cleaning mechanism occupies vertical space, resolving the contradiction between cleaning speed and device footprint.
Solution Approach 2:
The brush cleaner is nested within or below the substrate holding area, allowing the large brush to operate in the horizontal plane while the cleaning mechanism is vertically integrated. This nesting arrangement enables efficient substrate cleaning with a large brush without significantly increasing the overall device footprint.
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 configuration allows for efficient cleaning of the substrate's lower surface using a relatively large brush without significantly increasing the device's footprint, thereby maintaining throughput while ensuring the brush's cleanliness is maintained.
Implementation Method 1
a brush cleaner that cleans the lower-surface brush
Implementation Method 2
a lower-surface brush lifting-lowering driver that lifts and lowers the lower-surface brush between the processing position and the waiting position
Data Source
AI summary
A substrate is held in a horizontal attitude by a substrate holder. At a processing position, a lower surface of the substrate held by the substrate holder is cleaned by a lower-surface brush. The lower-surface brush is cleaned by a brush cleaner at a waiting position that overlaps with the substrate held by the substrate holder in an up-and-down direction and is below a processing position. The lower-surface brush is lifted and lowered by a lower-surface brush lifting-lowering driver between the processing position and the waiting position.