| 摘要 |
An imaging lens consists of, in order from the object side, a front group, a stop, and a rear group, wherein
the front group includes, in order from the most-object side, a positive first lens, a negative second lens, a negative third lens which are adjacently disposed, and further includes a final lens of the front group adjacent to the stop, with the surface toward the stop being convex toward the image side,the rear group includes, in order from the image side, two sets of cemented lenses having positive refractive powers, which are adjacently disposed,the object-side cemented lens of the two sets of cemented lenses is formed by cementing a positive lens and a negative meniscus lens together, andthe image-side cemented lens is formed by cementing a negative meniscus lens and a positive lens together. |
| 主权项 |
1. An imaging lens consisting of, in order from the object side, a front group, a stop, a rear group, wherein
the front group includes, in order from the most-object side, a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a negative refractive power, and a final lens of the front group adjacent to the stop, with the surface toward the stop St being convex toward the image side, which are adjacently disposed, the rear group includes, in order from the most-image side, two sets of cemented lenses having positive refractive powers, which are adjacently disposed, the object-side cemented lens of the two sets of cemented lenses is formed by cementing, in order from the object side, a positive lens with a convex surface toward the image side and a negative meniscus lens together, and the image-side cemented lens of the two sets of cemented lenses is formed by cementing, in order from the object side, a negative meniscus lens with a concave surface toward the image side and a positive lens together. |
