UV Light Irradiation Device with Feedback Control
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Solution Overview
Problem
Light irradiation devices used for curing ultraviolet cure resins and inks experience a decrease in optical power output over time, leading to incomplete curing or the need for readjustment of curing conditions, necessitating a solution to maintain consistent optical power.
Innovation Solution
A light irradiation device with a substrate featuring recesses for light-emitting and detecting elements, along with a heat-dissipating member and ultraviolet shield, which includes a system for detecting ultraviolet light intensity and adjusting the driving current to maintain initial optical power levels, using a constant current control section and driving current computing section to compensate for changes in irradiation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light irradiation device operates continuously for curing, then productivity increases, but optical power output decreases due to accumulation of irradiation time
Solution Approach 1:
The patent implements a feedback control system where a detecting element continuously monitors the optical power output of the light-emitting element. The driving control section receives detection results and adjusts the driving current in real-time to maintain consistent optical power output, thereby resolving the contradiction between continuous operation and power consistency.
Solution Approach 2:
The patent changes the driving current parameter dynamically based on irradiation time and detection results. By adjusting the driving current through the constant current control section, the system compensates for power degradation and maintains optimal curing conditions throughout continuous operation.
2Productivity
If irradiation time accumulates without correction, then productivity increases, but curing quality deteriorates due to incomplete curing
Solution Approach 1:
The detecting element provides continuous feedback on optical power output, enabling the driving control section to adjust driving current to maintain curing quality. This ensures complete curing even during prolonged operation without compromising manufacturing precision.
Solution Approach 2:
The system performs preliminary detection of optical power output and adjusts driving current in advance before power degradation affects curing quality. This proactive adjustment prevents incomplete curing and maintains manufacturing precision throughout continuous operation.
3Device complexity
If optical power output is not adjusted, then device complexity remains low, but curing performance degrades over time
Solution Approach 1:
The patent introduces a feedback control loop with detection and adjustment components. Although this increases device complexity, it ensures reliable and consistent curing performance by continuously monitoring and adjusting optical power output based on real-time conditions.
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 device ensures consistent optical power output over time, preventing incomplete curing and the need for readjustment by continuously monitoring and adjusting the light intensity, thereby maintaining effective curing performance.
Implementation Method 1
a light-emitting element 20 located in the first recess 12a and emitting ultraviolet light
Implementation Method 2
a detecting element 18 located in the second recess 12b and capable of detecting ultraviolet light
Implementation Method 3
heat-dissipating member
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(b)
AI summary
There are provided a light irradiation device and a light irradiation system which are capable of correcting changes in optical power output. A light irradiation device (100) includes: a substrate having an upper surface provided with a first recess and a second recess; a light-emitting element located in the first recess, the light-emitting element emitting ultraviolet light; and a detecting element located in the second recess, the detecting element being capable of detecting ultraviolet light.