Optical imaging system

An optical imaging system according to an embodiment of the present invention comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in order from an object side. The first lens has positive refractive power, the second lens has ne...

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Bibliographic Details
Main Authors LEE JI SU, JANG DONG HYUK, PARK IL YONG
Format Patent
LanguageEnglish
Korean
Published 19.01.2023
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Summary:An optical imaging system according to an embodiment of the present invention comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in order from an object side. The first lens has positive refractive power, the second lens has negative refractive power, and TTL/(2 × IMG HT) < 0.6 and -0.1 < SAG42/TTL < 0 are satisfied. TTL is a distance from an object-side surface of the first lens to an imaging plane on the optical axis, IMG HT is equal to half the diagonal length of the imaging plane, and SAG42 is a SAG value at the end of an effective aperture of an image-side surface of the fourth lens. Therefore, an optical system according to an embodiment of the present invention may have a reduced size while implementing high resolution. 본 발명의 일 실시예에 따른 촬상 광학계는 물체측으로부터 순서대로 배치된 제1 렌즈, 제2 렌즈, 제3 렌즈, 제4 렌즈, 제5 렌즈, 제6 렌즈 및 제7 렌즈;를 포함하고, 상기 제1 렌즈는 정의 굴절력을 갖고, 상기 제2 렌즈는 부의 굴절력을 가지며, TTL/(2×IMG HT) < 0.6; 및 -0.1 < SAG42/TTL < 0;을 만족하고, TTL은 상기 제1 렌즈의 물체측 면으로부터 촬상면까지의 광축 상 거리이고, IMG HT는 상기 촬상면의 대각길이의 절반이며, SAG42는 상기 제4 렌즈의 상측 면의 유효경 끝단에서의 SAG 값이다.
Bibliography:Application Number: KR20210176902