| 摘要 |
<p>Optical systems for endoscopes, borescopes, dental scopes, and the like, having three groups of lenses of positive optical power and an external entrance pupil (P). Typically, all three groups are displaced from the pupil (P) and focal planes (F). The displaced groups participate in the image transfer and pupil transfer. Optical power can be shifted from one group to another, distributing and reducing the overall power requirement, and aberration correction can be shared among these groups. The first group, which conventionally has the highest optical power and associated aberrations, can thus transfer some of the aberration correction to other groups. The sharing of these optical functions results in a fully integrated optical system. The total optical power is so reduced that a line-of-sight deviating prism (2) can be accommodated between the entrance pupil and the first lens group. The resulting simplicity makes the optical system suitable as a disposable item.</p> |
