Exposure Head Sealing Layout for Higher Light Utilization
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Solution Overview
Problem
The existing exposure heads face a reduction in light utilization efficiency due to the need for sealing materials that increase the distance between light emitting areas and lens arrays, compromising the light condensation efficiency.
Innovation Solution
The exposure head design includes a staggered arrangement of light emitting element array chips with a sealing material that minimizes the distance between the light emitting areas and the lens array, ensuring efficient light condensation by optimizing the positioning of the sealing area relative to the light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing material is added to cover the light emitting area and side face, then moisture and oxygen protection is improved, but the distance between light emitting area and lens array increases, reducing light utilization efficiency
Solution Approach 1:
The patent uses a sealing material in the form of a thin film that conformally covers the light emitting area and its side face. This thin film structure provides moisture and oxygen protection while minimizing the increase in distance between the light emitting area and lens array, thus reducing the negative impact on light utilization efficiency.
Solution Approach 2:
The sealing structure is designed to nest around the light emitting area, with the sealing material wrapping around the side face and covering the light emitting face. This nested configuration provides comprehensive protection while maintaining a compact overall structure that minimizes distance increase.
2Ease of manufacture
If light emitting element array chips are arranged in a staggered manner, then manufacturing cost is reduced, but the distance from light emitting area to lens array center increases, reducing light utilization efficiency
Solution Approach 1:
The patent employs an asymmetric arrangement where light emitting element array chips are positioned at different distances from the lens array center. Specifically, chips in different rows are offset from each other, creating an asymmetric pattern that reduces manufacturing complexity while the overall asymmetric configuration is optimized to maintain acceptable light utilization efficiency.
Solution Approach 2:
Different regions of the light emitting element array have different positioning characteristics. Chips in certain rows are positioned closer to the lens array center while others are offset, creating local variations in positioning that balance manufacturing ease with light utilization efficiency in different areas of the array.
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 design effectively suppresses the reduction in light utilization efficiency by minimizing the distance between the light emitting areas and the lens array, enhancing the overall light condensation process.
Implementation Method 1
a lens array configured to condense light emitted from the light emitting area
Implementation Method 2
a plurality of organic ELs (electro-luminescences) serving as light sources
Data Source
AI summary
An exposure head includes a plurality of light emitting element array chips. A first distance from a first side which is one of two long sides of each of the plurality of light emitting element array chips to one long side of a sealing area which is parallel to and proximate to the first side is shorter than a second distance from a second side which is another one of the two long sides to another long side of the sealing area which is parallel to and proximate to the second side, and a third distance from the first side to one long side of a light emitting area which is parallel to and proximate to the first side is shorter than a fourth distance from the second side to another long side of the light emitting area which is parallel to and proximate to the second side.