成像镜头组;IMAGING LENS

摘要

本发明系为一种成像镜头组，系包含有一光圈和一光学组，该光学组由物侧至像侧依序包含：一第一透镜，具有正屈折力，其物侧表面近光轴处为凸面、像侧表面近光轴处为凹面，其物侧表面及像侧表面皆为非球面；一第二透镜，具有正屈折力，且为塑胶材质，其像侧表面近光轴处为凹面，其物侧表面及像侧表面皆为非球面；一第三透镜，具有正屈折力，且为塑胶材质，其物侧表面及像侧表面皆为非球面；一第四透镜，具有负屈折力，其物侧表面近光轴处为凹面、像侧表面近光轴处为凸面；一第五透镜，具有正屈折力，且为塑胶材质，其物侧表面近光轴处为凸面、像侧表面近光轴处为凹面，其物侧表面及像侧表面皆为非球面，且其物侧表面及像侧表面皆具有一个以上反曲点；其中，该第三透镜的物侧表面曲率半径为R5，该第三透镜的像侧表面曲率半径为R6，该第一透镜的物侧表面至成像面于光轴上的距离为TL，该成像镜头组的最大成像高度对角线的一半为ImgH，并满足下列条件：0.3<(R5+R6)/(R5-R6)<1.15；1.2<TL/ImgH<1.65。藉以达到具大视角、大光圈、高解析能力、短镜头长度的目的。; a plastic second lens element with a positive refractive power having an aspheric object-side surface and an aspheric image-side surface being concave near the optical axis; a plastic third lens element with a positive refractive power having an aspheric object-side surface and an aspheric image-side surface; a fourth lens element with a negative refractive power having an object-side surface being concave near the optical axis and an image-side surface being convex near the optical axis; a plastic fifth lens element with a positive refractive power having an aspheric object-side surface being convex near the optical axis and an aspheric image-side surface being concave near the optical axis, and more than one inflection point being formed on the object-side and image-side surfaces of the fifth lens element; wherein a radius of curvature of the object-side surface of the third lens element is R5, a radius of curvature of the image-side surface of the third lens element is R6, a distance from the object-side surface of the first lens element to an image plane along the optical axis is TL, a half of the maximum diagonal imaging height of the optical lens system is ImgH, and they satisfy the relation: 0.3 < (R5 + R6)/(R5 - R6) < 1.15; 1.2 < TL/ImgH < 1.65.