OPTICAL SYSTEM AND CAMERA MODULE COMPRISING SAME

• Main Author: SEO, Eun Sung
• Format: Patent
• Language: English; French; Korean
• Published: 22.06.2023
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

An optical system disclosed in an embodiment of the present invention comprises first to eighth lenses arranged along an optical axis, wherein the first to eighth lenses have positive and negative refractive powers, the object-side surface of the first lens is convex, the sensor-side surface of the first lens is concave, the object-side surface of the fifth lens is concave, the sensor-side surface of the fifth lens is convex, the object-side surface of the third lens has the minimum effective diameter from among those of lens surfaces, the sensor-side surface of the eighth lens has the maximum effective diameter from among those of the lens surfaces, the mean value of the effective diameters of both surfaces of the second lens is less than the mean value of the effective diameters of both surfaces of the third lens, the sensor-side surface of the eighth lens is concave and has a critical point, and the mathematical formula: 0.5 < TTL / ImgH < 3 can be satisfied (TTL denotes the distance on the optical axis from the peak point of the object-side surface of the first lens to the image surface of an image sensor, and ImgH denotes 1/2 the maximum diagonal length of the image sensor). Un système optique décrit dans un mode de réalisation de la présente invention comprend des première à huitième lentilles disposées le long d'un axe optique, les première à huitième lentilles ayant des réfringences positives et négatives, la surface côté objet de la première lentille étant convexe, la surface côté capteur de la troisième lentille étant concave, la surface côté objet de la cinquième lentille étant concave, la surface côté capteur de la cinquième lentille ayant le diamètre effectif maximal parmi ceux des surfaces de lentille, la valeur moyenne des diamètres effectifs des deux surfaces de la deuxième lentille étant inférieure à la valeur moyenne des diamètres effectifs des deux surfaces de la troisième lentille, la surface côté capteur de la huitième lentille étant concave et ayant un point critique, et la formule mathématique : 0,5 < TTL/ImgH < 3 peut être satisfaite (TTL désigne la distance sur l'axe optique à partir du point de crête de la surface côté objet de la première lentille à la surface d'image d'un capteur d'image, et ImgH désigne 1/2 la longueur diagonale maximale du capteur d'image). 발명의 실시 예에 개시된 광학계는 광축을 따라 배치된 제1 내지 제8 렌즈를 포함하고, 상기 제1,8 렌즈는 양, 음의 굴절력을 가지고, 상기 제1 렌즈의 물체측 면은 볼록하며 센서측 면은 오목하며, 상기 제5 렌즈의 물체측 면은 오목하며 센서측 면은 볼록하며, 상기 제3 렌즈의 물체측 면은 렌즈 면들 중 최소 유효경을 가지며, 상기 제8 렌즈의 센서측 면은 렌즈 면들 중 최대 유효경을 가지며, 상기 제2 렌즈의 양측 면의 유효경의 평균 값은 상기 제3 렌즈의 양측 면의 유효경의 평균 값보다 작고, 상기 제8 렌즈의 센서 측 면은 오목하며 임계점을 가지며, 수학식: 0.5 < TTL / ImgH < 3을 만족할 수 있다(TTL은 상기 제1 렌즈의 물체 측 면의 정점으로부터 이미지 센서의 상면까지의 광축 거리이고, ImgH는 상기 이미지 센서의 최대 대각 방향 길이의 1/2이다).