Light Irradiation Apparatus with Shielding for Mode Transition Stability
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Solution Overview
Problem
Light irradiation apparatuses using LED driving circuits can cause unintended structural transformations in process-target objects due to unstable light output levels, leading to issues like color change, melting, and shape change, especially when the light output level is not suitable for processing.
Innovation Solution
A light irradiation apparatus with a light source, a driving circuit, and a controller that adjusts the light output level and beam spot energy density, including a transition mode where the energy density is set lower than in other modes to prevent structural transformations during mode changes, and a light shielding member to control light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light output level is changed using the LED driving circuit, then the light output can be adjusted, but unintended structural transformation may occur due to unstable light output during transition
Solution Approach 1:
The light shielding member is positioned to block light before the transition mode begins, preventing harmful light from reaching the process-target object during the unstable transition period. This preliminary protective action occurs before the light output becomes stable, avoiding structural transformation.
Solution Approach 2:
The light shielding member acts as an intermediary between the light source and the process-target object during mode transitions. It temporarily blocks the light path, mediating the interaction to prevent direct exposure to unstable light output that could cause structural transformation.
2Productivity
If the light output level is increased for processing, then the processing efficiency improves, but structural transformation such as melting and shape change may occur
Solution Approach 1:
The system dynamically adjusts the light shielding member's position based on the operation mode. During transition modes, the shielding member is positioned to block light, while during stable operation modes, it can be retracted to allow light exposure. This dynamic adaptation enables high light output for efficient processing while preventing structural transformation during unstable periods.
Solution Approach 2:
The control device monitors the operation mode and automatically positions the light shielding member accordingly. When detecting a transition mode, the system activates the shielding mechanism, providing feedback-based protection against structural transformation while allowing full light output during stable processing modes.
3Adaptability or versatility
If the light output transitions between modes, then different processing functions can be achieved, but color change and melting may occur due to unsuitable light output levels
Solution Approach 1:
The light shielding member is activated in advance during mode transitions to prevent harmful light exposure before the new operation mode stabilizes. This preliminary protection measures prevents color change and melting that would otherwise occur during the transition period between different processing functions.
Solution Approach 2:
The light shielding member serves as a protective intermediary during mode transitions, temporarily blocking the light path to prevent direct interaction between unstable light output and the process-target object. This mediation allows safe switching between different processing functions while maintaining manufacturing precision.
Data Source
AI summary
A light irradiation apparatus includes an irradiation unit including a light source to emit light to a process-target object, a light source driving circuit to drive the light source, a light source controller to control the light source driving circuit to change a light output level of the light source, and a light spot controller to control energy or energy density of a beam spot of the light on the process-target object depending on an operation mode, and a transition mode that one operation mode is being changed to another mode. The light spot controller sets the energy or energy density during the transition mode lower compared to either of the energy or energy density during the one operation mode before the transition mode and the energy or energy density during the another mode after the transition mode.