| 摘要 |
In an endoscope having a focusing ocular, a disposable probe includes a transfer module assembly with one or more relay modules (28, 30, 32), and an objective group (24) comprised of a distal glass window (34), a molded plastic prism (36) and three molded plastic lenses (38, 40, 42). Each relay module contains an entry glass rod, an intermediate glass rod, and an exit glass rod, each rod having flat end surfaces, and two identical molded plastic doublets. In certain embodiments, each relay module further includes identical molded entry and exit field lenses. In one preferred embodiment, the ocular comprises several glass elements, including an axially movable focusing element and two non-movable doublets. The disposable probe introduces predetermined optical aberration into the image, and the focusing ocular specifically corrects this aberration. The ocular is typically not disposable. A single curved surface is formed on the distal glass window of the probe; all other curved optical surfaces of the disposable probe are formed on molded plastic members, thereby reducing the cost of the probe sufficiently to be cost-effective for single patient, disposable use. |
