Indoor Lighting can be improved by using a refractive lens. This lens is a flat-plate, and patterns are engraved on its surface. The engraved patterns are designed to refract sun's rays. In this study, two patterns have been suggested. The one is designed to refract sun's rays in one direction. The another is designed to refract sun's rays in 4 directions. The designed patterns were machined with a diamond tool and engraved on an experimental Poly Methyl Meta Acrylate flat-plate. Optical experiments have been done by using a laser rays and natural sun's rays. The results showed that sun's rays refracted in one or 4 directions effectively. The refracted rays also improved indoor lighting.

Abstract
 1. 서론
 2. 굴절 패턴 설계
  2.1 한 방향 굴절 패턴 설계
  2.2 분산 굴절 패턴 설계
 3. 평판형 굴절렌즈의 시제작
  3.1 패턴의 설계
  3.2 공작물 및 공구
  3.3 공작기계 및 가공방법
 4. 렌즈의 평가
  4.1 레이저 포인터 광선에 의한 평가
  4.2 자연광에 의한 평가
 5. 결론
 참고문헌

• 심충건(주성대학 컴퓨터응용기계과) | C. G. SIM