| Summary: | 碩士 === 國立中央大學 === 機械工程研究所碩士在職專班 === 99 === As the population of digital camera, people are more familiar with the photography. Recording everything in our daily life conveniently has become one part of our lives. Built-in flash module is one of the important parts of digital camera to increase the lighting of main subject. In order to producing high-energy filling light effect, we must gather light more efficiency.
Most of designs on flash module focus on gathering light efficiency. By exporting high-energy light, we make the planar illumination narrow and concentrated. One the other hand, photo’s quality will decreased by concentrated light due to overexposing, low resolution, and dark corners. In order to improve this question, we need to increase the wise of planar illumination by redesigning the flash light module.
In this study, the flash module of built- in digital camera lens is using xenon lamp and white LED as light source. We separated one light source into multi-region light source. For the distribution of light within the region, we change the structure of micro lens and integrate them into the compound lens. By the simulation software through the optical lens, in the effective distance of 2.5m and effective range of 2x1.5m, we get the following results: When using xenon light as light source, the uniformity of the compound lens is 82.6%; when using white LED light as light source, the uniformity of the compound lens is 85%.
In conclusion, compound lens has a better illumination uniformity and significant upgrade comparing to the simulation results of existing flash lens.
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