Insulated Main Roller Bias Control in Roll-to-Roll Vacuum Deposition
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Solution Overview
Problem
In film deposition systems using roll-to-roll processing, electrical short-circuits can occur due to electrostatic charging of masking materials, leading to unstable bias potentials on the main roller during film deposition.
Innovation Solution
A vacuum treatment apparatus and method that includes a main roller with at least part of its outer circumferential surface coated with an insulating material, ensuring stable application of a bias potential by preventing electrostatic charges from reaching the roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If masking base material is used to cover part of base material for film deposition, then film deposition precision is improved, but electrical short-circuit occurs causing bias potential instability
Solution Approach 1:
An insulating layer is introduced as an intermediary between the masking base material and the main roller. This insulating layer prevents direct electrical contact, blocking the transfer of electrostatic charges from the masking material to the roller while still allowing the masking material to perform its film deposition function. The insulating layer acts as a mediator that decouples the electrical interference from the mechanical masking function.
Solution Approach 2:
The patent applies an insulating coating to the main roller, creating a surface layer that copies the electrical insulation properties needed to prevent short-circuits. This coating layer replicates the electrical isolation function without requiring fundamental changes to the roller's mechanical structure or the masking material's function.
2Productivity
If masking base material is peeled off from film deposition target, then masking function is completed, but electrostatic charging causes electrical short-circuit
Solution Approach 1:
The patent converts the potentially harmful electrostatic charging phenomenon into a beneficial insulation mechanism. By applying an insulating layer to the main roller, the electrostatic charges that build up on the masking material during peeling are prevented from discharging through the roller. The insulation transforms the harmful short-circuit effect into a controlled electrical isolation that maintains process stability.
Solution Approach 2:
The insulating layer on the main roller serves as an intermediary that blocks the harmful electrostatic discharge path. During the peeling process, this insulating layer mediates between the charged masking material and the roller, preventing charge transfer while allowing the mechanical peeling operation to complete successfully.
3Manufacturing precision
If bias potential is applied to main roller during film deposition, then film deposition quality is improved, but electrostatic short-circuit makes bias potential unstable
Solution Approach 1:
The insulating layer on the main roller acts as an intermediary that allows the bias potential to be applied for improved film deposition quality while preventing electrostatic short-circuits from disrupting the potential stability. The insulation layer decouples the electrical field generation function from the charge accumulation problem.
Solution Approach 2:
The patent changes the electrical parameter of the main roller surface by applying an insulating coating. This parameter change allows the roller to maintain a stable bias potential during film deposition by preventing charge leakage and short-circuits, thereby preserving the electrical field needed for high-quality film formation.
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 solution stabilizes the bias potential on the main roller during film deposition, preventing electrical short-circuits and maintaining consistent electrostatic adhesion forces, thus ensuring smooth and unwrinkled conveyance of base materials.
Implementation Method 1
an electrical short-circuit where electric charges with which the masking base material is charged due to electrostatic charging flow down to the main roller can occur
Implementation Method 2
at least a part of the outer circumferential surface, which is uncovered with the first base material, being coated with an insulating material
Implementation Method 3
a film deposition system using roll-to-roll processing that forms a film on an elongated film deposition target base material (band-like film) while winding the base material through a main roller in a pressure-reduced atmosphere
Implementation Method 4
has an outer circumferential surface that is held in contact with the non-film deposition surface, and winds and conveys the first base material
Data Source
AI summary
A vacuum treatment apparatus including: a first wind-off roller paying out a first base material; a first wind roller winding the first base material; a main roller having an outer circumferential surface in contact with a non-film deposition surface, and winding and conveying the first base material, at least a part of the outer circumferential surface, which is uncovered with the first base material, being coated with an insulating material; a deposition source facing the outer circumferential surface of the main roller; a second wind-off roller paying out a second base material that is wound and conveyed by the main roller and covers a part of a film deposition surface of the first base material on the outer circumferential surface of the main roller; a second wind roller winding the second base material; and a power source applying a bias potential to the main roller.