| 摘要 |
An imaging lens consists of a first lens group, a second lens group, an aperture stop and a third lens group that has positive refractive power in this order from an object side. The first lens group consists of an L11 lens having positive refractive power, an L12 lens having negative refractive power, an L13 meniscus lens having negative refractive power with its concave surface facing an image side, an L14 lens having negative refractive power with its concave surface facing the object side and two or three lenses, each having positive refractive power, in this order from the object side. The second lens group consists of an L2p lens having positive refractive power and an L2n lens having negative refractive power. |
| 主权项 |
1. An imaging lens consisting of:
a first lens group; a second lens group; a stop; and a third lens group that has positive refractive power in this order from an object side, wherein the first lens group consists of a first lens (L11) having positive refractive power, a second lens (L12) having negative refractive power, a third, meniscus lens (L13) having negative refractive power with its concave surface facing an image side, a fourth lens (L14) having negative refractive power, and two or three further lenses (L15, L16, L17), each having positive refractive power, in this order from the object side, the concave surface of the fourth lens (L14) facing the object side and facing the two or three further lenses, and wherein the second lens group consists of two lenses of an L2p lens having positive refractive power and an L2n lens having negative refractive power, and wherein the third lens group includes a cemented lens of a lens having positive refractive power and a lens having negative refractive power cemented together, a lens having negative refractive power, and a cemented lens of a lens having positive refractive power and a lens having negative refractive power cemented together consecutively in this order from the object side. |
