LENS SYSTEM AND OPTICAL COMPRISING THE SAME

The present invention relates to a lens system, and an optical apparatus including the lens system. The lens system comprises: a second lens group having a positive refractive power from an object side to an image side along an optical axis; and a first lens group having an aperture stop and a posit...

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Bibliographic Details
Main Authors YUN, HYUN SIK, PARK, JONG YOUNG
Format Patent
LanguageEnglish
Korean
Published 15.05.2017
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Summary:The present invention relates to a lens system, and an optical apparatus including the lens system. The lens system comprises: a second lens group having a positive refractive power from an object side to an image side along an optical axis; and a first lens group having an aperture stop and a positive refractive power. The second lens group comprises: a meniscus-type first lens having a convex surface toward the object side; a cemented lens consisting of a biconvex second lens and a biconcave third lens; and a cemented lens consisting of a biconvex fourth lens and a biconcave fifth lens. The first lens group comprises: a meniscus-type sixth lens having a convex surface toward the object side; a biconvex seventh lens; a cemented lens consisting of a biconvex eighth lens and a biconcave ninth lens; and a cemented lens consisting of a meniscus-type tenth lens having a convex surface toward the object side and a biconvex eleventh lens. The lens system satisfies specific equations 1 and 2; thereby maintaining excellent optical performance, and may be reduced in size and weight. 본 발명은 렌즈계 및 이를 포함하는 광학 기기에 관한 것으로서, 보다 상세하게는 광축을 따라 물체측에서 이미지측순으로 정의 굴절력을 갖는 제2렌즈군, 개구 조리개 및 정의 굴절력을 갖는 제1렌즈군을 포함하고, 상기 제2렌즈군은 물체측면이 볼록한 매니스커스형 제1렌즈; 양볼록형 제2렌즈와 양오목형 제3렌즈가 접합된 접합렌즈; 및 양볼록형 제4렌즈와 양오목형 제5렌즈가 접합된 접합렌즈를 포함하고, 상기 제1렌즈군은 물체측면이 볼록한 매니스커스형 제6렌즈; 양오목형 제7렌즈; 양볼록형 제8렌즈와 양오목형 제9렌즈가 접합된 접합렌즈; 및 물체측면이 볼록한 매니스커스형 제10렌즈와 양볼록형 제11렌즈가 접합된 접합렌즈를 포함하며, 특정의 수학식 1 및 2를 만족함으로써, 우수한 광학성능을 유지하고, 렌즈계 전체의 소형 경량화를 실현할 수 있는 렌즈계 및 이를 포함하는 광학 기기에 관한 것이다.
Bibliography:Application Number: KR20150155317