| 摘要 |
本发明系揭示一种光学取像镜头，包含四片透镜，由物侧至像侧依序为第一透镜、第二透镜、第三透镜及第四透镜。第一透镜具有正光焦度。第二透镜具有负光焦度。第三透镜具有正光焦度。第四透镜具有负光焦度，其像侧光学面设有至少一反曲点。其中，第一至第四透镜皆包含至少一非球面表面。光学取像镜头另包含光圈及影像感测元件。光圈设置于被摄物与第二透镜之间，影像感测元件设置于成像面。第一透镜物侧光学面到成像面于光轴上的距离为TTL，光学取像镜头之整体光学系统焦距为f，从物侧方向以相对于光轴为45度之入射角通过该光圈中心后之光线，其投射于成像面之交点与光轴之垂直距离为Y1，光学取像镜头满足关系式：1.3<TTL/f<1.8、0.8<Y1/f<0.98。 This invention is disclosing an optical lens for image pickup, in order from an object side to an image side comprising a first lens, a second lens, a third lens and fourth lens. The first lens has positive refractive power. The second lens has negative refractive power. The third lens has positive refractive power. The fourth lens has negative refractive power with at least one inflection point on image-side surface. Wherein, each of the lens has at least one aspheric surface. The optical lens further comprises a stop and an image sensor. The stop disposed between the object and the second lens, and the image sensor disposed at the image-plane. TTL is the distance between the object-surface of the first lens to the image-plan, f is the focal length of the optical lens, the intersection point is formed by the light penetrating the center of the aperture with an incident angle of 45°;TTL/f<1.8、0.8<Y1/f<0.98. |
