HIGH LENS NUMERICAL APERTURE PROJECTION OPTICAL SYSTEM WITH DOE SURFACE FOR AUTOMOTIVE LIGHTING GRILLE

The present invention relates to a projection optical system for a vehicle lighting grill, which is provided to adjust light distribution concerning an LED light source, and transfers and displays a beam pattern, which is controlled to be distributed, at a lighting grill unit provided as a transmission-type grill on the front surface side of a vehicle. To this end, the present invention is characterized by comprising: a first lens which is a lens structure arranged at the front side of the light source, and equipped with a diffractive optical element Fresnel (DOE-Fresnel) surface to prevent color blurring with respect to the incident light of the light source; a second lens which is a lens structure arranged to be close to the front side of the first lens, and performs a high refractive processing and a penetration function with respect to the incident light; a third lens which is a lens structure arranged to be close to the front side of the second lens, and removes spherical aberration with respect to the incident light; an aperture arranged to be close to the front side of the third lens; a fourth lens which is a lens structure arranged at the front side of the aperture, and removes spherical aberration while collecting the incident light to the center; a fifth lens which is a lens structure which is arranged at an interval while maintaining a predetermined distance at the front side of the fourth lens, and removes off-axis aberration and off-axis chromatic aberration with respect to the incident light; and a sixth lens which is a lens structure arranged to be close to the front side of the fifth lens, removes the off-axis aberration and off-axis chromatic aberration along with the fifth lens, and discharges the ultimate exiting light of the controlled beam pattern which is transferred to the lighting grill unit of the vehicle. Therefore, brightness may be improved. 본 발명은 LED 광원에 대해 배광분포를 조정하여주는 것으로서, 자동차의 전면 측 투과형 그릴로 구비되는 라이팅 그릴부에 배광 제어된 빔 패턴을 전사하여 디스플레이하기 위한 자동차 라이팅 그릴용 프로젝션 광학계에 관한 것으로서, 상기 광원의 앞쪽에 배치되는 렌즈구조체로서, 광학회절소자 프레넬(DOE-Fresnel) 표면을 구비하여 광원의 입사광에 대해 색 번짐을 방지하는 제1렌즈; 상기 제1렌즈의 앞쪽에 근접 배치되는 렌즈구조체로서, 입사광에 대해 고굴절 처리 및 투과 기능을 수행하는 제2렌즈; 상기 제2렌즈의 앞쪽에 근접 배치되는 렌즈구조체로서, 입사광에 대해 구면수차를 제거하는 제3렌즈; 상기 제3렌즈의 앞쪽에 근접 배치되는 조리개; 상기 조리개의 앞쪽에 배치되는 렌즈구조체로서, 입사광을 중앙으로 모아주면서 구면수차를 제거하는 제4렌즈; 상기 제4렌즈의 앞쪽에 일정거리를 유지한 채로 간격 배치되는 렌즈구조체로서, 입사광에 대해 비축 수차 및 비축 색수차를 제거하는 제5렌즈; 상기 제5렌즈의 앞쪽에 밀착 배치되는 렌즈구조체로서, 제5렌즈와 함께 비축 수차 및 비축 색수자를 제거하며, 자동차의 라이팅 그릴부로 전사되는 제어된 빔 패턴의 최종 출사광을 내보