Movable Shield for Ghost Image Prevention in Dual-Side Exposure
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Solution Overview
Problem
Existing exposure apparatus for printing plate precursors face challenges in avoiding ghost images and minimizing heating caused by light reflection, particularly when using multiple light sources for front and backside exposure.
Innovation Solution
The apparatus employs a movable shield that travels with a second light source to absorb and redirect light, preventing reflections that could cause ghost images and reducing heating of the first light source and its components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a second light source is used to illuminate the second side of the relief precursor, then exposure completeness is improved, but ghost images are generated due to light reflection
Solution Approach 1:
A movable shield is introduced as an intermediary element between the first and second light sources. The shield captures and absorbs light from the second light source that would otherwise reflect off the relief precursor and create ghost images. The shield is positioned to block reflected light paths while allowing the second light source to effectively illuminate the second side of the relief precursor for complete exposure.
2Manufacturing precision
If a second light source is used to illuminate the second side of the relief precursor, then exposure completeness is improved, but heating of the first light source increases due to light absorption
Solution Approach 1:
The movable shield serves as a thermal barrier by intercepting light from the second light source before it can reach and be absorbed by the first light source. This prevents unnecessary heating of the first light source and its surrounding components, maintaining stable operating temperatures while still enabling complete two-sided exposure of the relief precursor.
3Object-generated harmful factors
If a movable shield is introduced to capture reflected light, then ghost images are prevented, but device complexity increases
Solution Approach 1:
The shield is designed to be movable rather than fixed, allowing it to be positioned and repositioned as needed during the exposure process. This dynamic configuration enables the shield to adapt to different exposure scenarios and relay precursor positions, effectively preventing ghost images without requiring a completely fixed and complex apparatus structure. The movability provides flexibility while maintaining operational simplicity.
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 solution effectively prevents ghost images and reduces heating, ensuring more accurate and efficient exposure of printing plate precursors, particularly when exposing from both sides.
Implementation Method 1
The movable shield is located between the first light source and the second light source and configured to capture at least a portion of the light from the second light source transmitted through the relief precursor
Implementation Method 2
the plate is exposed through the mask with radiation such that the photosensitive layer undergoes polymerization or crosslinking
Implementation Method 3
a first light source for back exposure and a second light source for front exposure
Data Source
AI summary
An apparatus for exposure of a relief precursor includes a substrate layer and at least one photosensitive layer. The apparatus includes a first light source configured to illuminate a first side of the relief precursor, a movable second light source configured to illuminate a second side of the relief precursor opposite the first side, a movable shield located between the first light source and the second light source and configured to capture at least a portion of the light of the second light source transmitted through the relief precursor, and a moving means configured to move the movable shield simultaneously with the second light source.