LENS SYSTEM, IMAGE CAPTURING DEVICE, AND MOBILE BODY

• Main Authors: INUKAI TAKESHI, MATSUNAGA SHIGEHIKO, OHATA ATSUSHI
• Format: Patent
• Language: English; Japanese
• Published: 07.10.2021
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

To provide a compact imaging lens system which offers high resolution and is well corrected for magnification chromatic aberration.SOLUTION: A lens system 100 comprises a first lens group G1 having negative refractive power, an aperture stop ST, and a second lens group G2 having positive refractive power arranged in order from the object side. The first lens group comprises, in order from the object side, a negative lens L11 with a convex object-side surface disposed on the most object side, a negative lens L12 with a convex object-side surface disposed right next to the negative lens, and a cemented triplet TC obtained by cementing a negative lens CL1, a positive lens CL2, and a negative lens CL3 in order from the object side, the cemented triplet having positive refractive power. The lens system satisfies a condition expressed as: 3.6<L/Y<5.5, where L represents an optical axial distance from a most object-side lens surface to an imaging position, and Y represents a maximum image height.SELECTED DRAWING: Figure 1 【課題】小型、高解像度で、倍率色収差が良好に補正された撮像レンズ系を提供する。【解決手段】レンズ系１００は、物体側より順に、負の屈折力を有する第１レンズ群Ｇ１と、開口絞りＳＴと、正の屈折力を有する第２レンズ群Ｇ２とを備える。第１レンズ群は、物体側から順に、最も物体側に配置された物体側に凸面を向けた負レンズＬ１１と、負レンズに連続して配置された物体側に凸面を向けた負レンズＬ１２と、物体側から順に負レンズＣＬ１と、正レンズＣＬ２と、負レンズＣＬ３の、３枚のレンズを接合してなる３枚接合レンズＴＣとを備え、３枚接合レンズは、正の屈折力を有する。Ｌを最も物体側のレンズ面から結像位置までの光軸上の距離、Ｙを最大像高として、条件式３．６＜Ｌ／Ｙ＜５．５、を満足する。【選択図】図１