• Korean Journal of Optics and Photonics
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• v.34 no.6
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• pp.276-282
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• 2023

In this paper, we designed a lighting optical system using a freeform lens as a substitute for expensive gobo lighting. Unlike gobo lighting, freeform lens lighting does not use an image mask, and it can form and project an image directly on the lens surface using only a single lens, thus reducing the cost compared to gobo lighting. In order to verify the performance of freeform lens lighting with these advantages, we conducted an illuminance simulation. As a result, it was confirmed that it can replace gobo lighting because it has an illuminance distribution similar to the image we want to irradiate and a light efficiency of 47% similar to the performance of gobo lighting.

• Korean Journal of Optics and Photonics
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• v.34 no.2
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• pp.61-65
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• 2023

This paper studies a method of applying pre-distortion to the image mask of the gobo illumination optical system to correct an irradiated image and irradiate a clear image. In the case of the gobo illumination optical system, since it is generally irradiated with a tilt, distortion in the upper and lower directions occurs severely in the image. To solve this problem, the correction coordinates of the image were derived using a proportional equation, and the distortion was corrected by applying them to the image mask. As a result, it was confirmed that the distortion was reduced by 64.5% compared to the case of using the existing image mask.