| 摘要 |
一种光学成像镜头沿着一光轴从物侧至像侧依序包含一第一透镜、一光圈、一第二、三、四、五透镜，各透镜都具有一物侧面及一像侧面；该第一透镜的该像侧面具有一位于圆周附近区域的凹面部；该第二透镜的该物侧面具有一位于圆周附近区域的凸面部，该第二透镜的该像侧面具有一位于圆周附近区域的凸面部；该第三透镜为塑胶材质；该第四透镜的该像侧面具有一位于圆周附近区域的凸面部；及该第五透镜的该物侧面具有一位于圆周附近区域的凹面部，并满足(G12+G45)/T3≧1.5及T3/G12≦1.1。 An imaging lens comprises a first lens element, an aperture stop, a second lens element, a third lens element, a fourth lens element, and a fifth lens element arranged in order from an object side to an image side along an optical axis of said imaging lens, each of said first lens element, said second lens element, said third lens element, said fourth lens element, and said fifth lens element have an object-side surface facing toward the object side and an image-side surface facing toward the image side. Said image-side surface of said first lens element has a concave portion in a vicinity of a periphery of said first lens element. Said object-side surface of said second lens element has a convex portion in a vicinity of a periphery of said second lens element, and Said image-side surface of said second lens element has a convex portion in a vicinity of a periphery of said second lens element. Said third lens element is made of plastics. Said image-side surface of said fourth lens element has a convex portion in a vicinity of a periphery of said fourth lens element. Said object-side surface of said fifth lens element has a concave portion in a vicinity of a periphery of said fifth lens element. Said imaging lens satisfies (G12+G45)/T3 ≧ 1.5 and T3/G12 ≦ |
