Light Irradiator Trace Routing for Illuminance Uniformity
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Solution Overview
Problem
The existing printing apparatuses experience unevenness in illuminance among light emitting elements due to differences in trace length and current flow, caused by the presence of fixing holes on the light source substrates, leading to inconsistent light distribution during liquid curing processes.
Innovation Solution
A light irradiator design featuring a substrate with multiple light source rows, where the fixing part is strategically placed between light sources in one row but not in another, and traces are configured with circumventing parts to equalize resistance and minimize unevenness, ensuring consistent current distribution across all light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a fixing hole is provided in the light source substrate to fix the heat sink, then the heat dissipation is improved, but the trace length among light emitting elements becomes uneven, leading to uneven illuminance
Solution Approach 1:
The patent applies local quality by providing different trace configurations for different light source rows. Specifically, the first light source row has traces that bypass the fixing hole area, while the second light source row has traces that do not bypass, creating localized trace length compensation where needed to maintain uniform illuminance across all light emitting elements
Solution Approach 2:
The patent uses asymmetry by intentionally creating unequal trace lengths for different light source rows. The first light source row's traces are designed to be longer (bypassing the fixing hole) to compensate for the current reduction caused by the fixing hole's proximity, while the second row's traces remain shorter, creating an asymmetric trace configuration that balances current distribution and achieves uniform illuminance
2Strength
If the fixing part is arranged between adjacent light sources in one row, then the heat sink can be fixed to the substrate, but the trace must circumvent the fixing part, increasing trace length and resistance
Solution Approach 1:
The patent applies local quality by providing different trace configurations for different light source rows. Specifically, the first light source row has traces that bypass the fixing hole area, while the second light source row has traces that do not bypass, creating localized trace length compensation where needed to maintain uniform illuminance across all light emitting elements
Solution Approach 2:
The patent changes the trace configuration parameter (bypassing vs. non-bypassing) for different light source rows to compensate for the fixing part's impact on current distribution, thereby maintaining uniform illuminance despite the presence of the fixing structure
Data Source
AI summary
There is provided a light irradiator including: light sources forming first and second light source rows; a heat sink; a substrate including first and second traces connected to the first and second light source rows, respectively; and a fixing part configured to fix the heat sink to the substrate. The fixing part is arranged between adjacent light sources included in the first light source row and adjacent in the first light source row; and the fixing part is not arranged between adjacent light sources included in the second light source row and adjacent in the second light source row. The first trace includes a first circumventing part configured to circumvent the fixing part; and the second trace includes a second circumventing part configured to circumvent the fixing part and having a directional component different from the first direction.