근적외선 차단렌즈의 광학적 성능과 개발 방향에 관한 고찰 = Consideration on Optical Performance and Development Direction of Near-infrared Blocking Lens

국문 초록 (Abstract)

목적 : 적외선 차단렌즈의 근적외선 차단율과 시감투과율을 제조방식 및 근적외선 차단제 첨가 여부에 따라 조사하고, 근적외선 차단렌즈의 개발 방향에 대하고 논하였다.
방법 : 시중에서 유통되고 있는 국내외 브랜드의 근적외선 차단렌즈 20종(C-type 10종, M-type 5종, TMtype 5종)을 대상으로 가시광선에서 근적외선에 이르는 380~1,400 nm 영역에서 5 nm 간격으로 투과율을 측정한후, KS B ISO 13666 표준에 따라 근적외선 차단율과 시감투과율 구하였다.
결과 : 근적외선 차단율은 TM—type이 평균 62.3%로 가장 우수하였지만, 착색렌즈에 미러코팅을 한 관계로 시감투과율은 평균 20.2%로 매우 낮았다. M—type의 경우는 근적외선 차단제의 첨가로 인한 근적외선 차단효과가명확하게 나타나기는 했지만, 근적외선 차단제를 첨가하지 않은 C-type의 렌즈의 근적외선 차단율보다 그 성능이떨어졌고, 시감투과율 또한 낮았다. 근적외선 차단제가 첨가되지 않은 C-type의 렌즈들에서 근적외선 차단율은 우수하였을 뿐만 아니라, 시감투과율 또한 무반사 렌즈 수준으로 높게 나타났다.
결론 : 최적화된 코팅설계가 적용되면 AR 렌즈 수준의 높은 시감투과율을 보이면서 TM-type의 근적외선 차단율을 능가하는 우수한 근적외선 차단렌즈를 개발할 수 있다는 점에서 근적외선 차단렌즈의 설계 방향은 C-type이가장 효과적이라 할 수 있다.

다국어 초록 (Multilingual Abstract)

Purpose : The near-infrared blocking rate and luminous transmittance of near-infrared blocking lenses were investigated according to the manufacturing method and the addition of near-infrared blocking additive, and the development direction of near-infrared blocking lenses was discussed.
Methods : The spectral transmittances of 20 types of near-infrared blocking lenses (10 types of C-type, 5 types of M-type, and 5 types of TM-type) of domestic and foreign brands on the market were measured at 5 nm intervals in the 380~1,400 nm range from visible light to near infrared, and the near-infrared blocking rate and luminous transmittance were calculated according to the KS B ISO 13666 standard.
Results : TM-type lenses have the best near-infrared blocking rate with an average of 62.3%, but due to the mirror coating on the tinted lenses, the luminous transmittances were very low with an average of 20.2%. In the case of M-type lenses, the near-infrared blocking effects were clearly shown due to the addition of the near infrared blocking additive, but in reality, the near-infrared blocking performances were lower than those of C-type lenses without the addition of the near-infrared blocking additive, and the luminous transmittances were also low.
In C-type lenses without the addition of a near-infrared blocking additive, not only were the near-infrared blocking rates excellent, but the luminous transmittances were also as high as that of AR lens.
Conclusion : If an optimized coating design is applied, it is possible to develop excellent near-infrared blocking lenses that exceed the near-infrared blocking rates of TM-type lenses while showing a high luminous transmittance similar to that of AR lens. Therefore It can be concluded that C-type lenses are the most effective model for near-infrared blocking lenses.