| 摘要 |
<p>A rigid endoscope comprises a high refractive index (HRI) tunnel rod (1), preferably made of glass, for transfer of image light from a distal end to a proximal end of the device, such HRI tunnel rod is provided with a blackened surface (7) so that a minimum of light is scattered and reflected within the rod. The HRI tunnel rod shortens the apparent distance from the proximal to the distal end by virtue of its refractive index being greater than that of air, and also provides a light tunnel (25) which can carry the image over a relatively long distance by virtue of its modified inside walls. Relatively simple lenses (5, 17) are incorporated at the ends of the rod for image formation so as to cover a wide object field and to relay the image to a video camera (3). Stereo measuring embodiments of the endoscope provides dual optical paths for yielding two images containing parallax data.</p> |
