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UV–Vis Spectrometers

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.

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Design of a collimated UV-LED exposure unit based on light spread function method.

Shin-Hong Kuo, Chi-Feng Chen

|October 20, 2017

Summary

A new light spread function (LSF) method ensures uniform irradiance for UV-LED exposure units (EU) in printed circuit board manufacturing. This technique achieves 98.23% uniformity, optimizing UV curing processes.

Area of Science:

Optoelectronics
Photolithography
Materials Science

Background:

Uniform irradiance is critical for printed circuit board (PCB) manufacturing using UV-LED exposure units (EU).
Traditional methods struggle to accurately calculate source-to-source distances for optimal uniformity.
Achieving consistent UV exposure is essential for reliable PCB fabrication.

Purpose of the Study:

To develop and validate a novel method for achieving uniform irradiance in collimated UV-LED exposure units.
To introduce a regional maximally flat condition for the light spread function (LSF) to enhance irradiance calculations.
To verify the effectiveness of the proposed LSF method through optical simulations and experimental validation.

Main Methods:

Investigation of a collimated UV-LED exposure unit (EU) using the light spread function (LSF) method.

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Proposal of a regional maximally flat condition for the LSF to accurately determine source-to-source distances.

Implementation of the proposed condition within optical simulation software for LSF calculations.

Verification of design results through simulation and analysis of irradiance distribution.

Main Results:

The proposed LSF method, incorporating the regional maximally flat condition, accurately calculates parameters for uniform irradiance.
Simulations demonstrated the effectiveness of the method, achieving a uniformity of 98.23%.
The average irradiance achieved was 43.32 mW/cm², indicating high efficiency.

Conclusions:

The developed light spread function (LSF) method is highly effective for designing collimated UV-LED exposure units.
The regional maximally flat condition provides a robust approach to achieving uniform irradiance distributions.
This research offers a significant advancement for optimizing UV curing processes in printed circuit board manufacturing.