OPTICAL IMAGING SYSTEM

An optical imaging system includes a first lens, as second lens, a third lens, a fourth lens, and a fifth lens. The first lens includes a positive refractive power and a convex image-side surface. The second lens includes a positive refractive power, and the third lens includes a negative refractive power. The fourth lens includes a positive refractive power, and the fifth lens includes a positive refractive power. The first to fifth lenses are sequentially disposed from an object side toward an imaging plane. 提供种光学成像系统，所述光学成像系统包括第透镜、第二透镜、第三透镜、第四透镜和第五透镜。所述第透镜具有正屈光力和呈凸面的像方表面。所述第二透镜具有正屈光力，所述第三透镜具有负屈光力。所述第四透镜具有正屈光力，所述第五透镜具有正屈光力。从物方朝向成像面顺序地设置第透镜至第五透镜。