Foil Transfer Device Velocity-Based Laser Power Control
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Solution Overview
Problem
Conventional foil transfer methods using laser beams result in uneven transfer due to non-constant power during acceleration and deceleration, causing heat-induced expansion and uneven application of foil films.
Innovation Solution
A foil transfer device with a controller that adjusts the power of the light emitter based on velocity indication values during acceleration and deceleration periods, ensuring consistent heat application by varying the electric current, thereby maintaining even transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the irradiation unit is linearly moved from the start point to the end point at a predetermined velocity, then the foil film can be transferred to the substrate, but the velocity is non-constant during acceleration and deceleration causing uneven transfer
Solution Approach 1:
The patent changes the parameter of laser beam power dynamically during the scanning process. Specifically, the controller adjusts the power of the laser beam based on the velocity of the irradiation unit, increasing power during acceleration and deceleration phases to compensate for the non-constant velocity, thereby maintaining uniform foil transfer across the entire scanning area.
2Power
If the power of the laser beam is kept constant throughout the movement, then the laser emitter operation is simplified, but the foil film experiences excessive heat during acceleration and deceleration causing expansion and uneven transfer
Solution Approach 1:
The patent dynamically changes the power parameter of the laser beam during operation. The controller adjusts the laser power based on the velocity indication value, reducing power during acceleration and deceleration phases when the irradiation unit slows down, thereby preventing excessive heat accumulation and foil film expansion while maintaining adequate power during constant velocity phases for effective transfer.
3Speed
If the velocity indication value is adjusted during acceleration and deceleration, then the irradiation unit moves non-uniformly, but the laser beam power should be adjusted accordingly to maintain constant heat application
Solution Approach 1:
The patent implements a feedback control mechanism where the controller receives the velocity indication value from the driver and uses it to adjust the laser beam power. The controller continuously monitors the velocity changes during acceleration and deceleration and dynamically adjusts the laser power in response, ensuring that the heat application remains consistent despite velocity variations, thereby maintaining uniform foil transfer quality.
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 reduces uneven transfer during acceleration and deceleration, preventing foil film expansion and ensuring consistent application across the entire transfer area.
Implementation Method 1
a light emitter that emits the light; a driver to perform the scanning with the light by moving one or both of an irradiator and the substrate relative to each other to cause the irradiator to cast the light emitted by the light emitter
Implementation Method 2
a controller that controls the light emitter so as to cause the light emitter to change power of the light according to a velocity indication value during at least one of an acceleration period and a deceleration period
Data Source
AI summary
A foil transfer device includes a light emitter that emits light, a driver that causes scanning to be performed with the light by moving one or both of an irradiator and a substrate relative to each other, the irradiator casting the light emitted by the light emitter, and a controller that causes the light emitter to change power of the light according to a velocity indication value during at least one of an acceleration period from a time when at least one of the irradiator and the substrate begins to move to a time when a velocity thereof becomes constant and a deceleration period from a time when the velocity is constant to a time when at least one of the irradiator and the substrate stops.