| 摘要 |
An optical sensor in a sheet transport system for detecting a sheet along a paper path. The sensor includes a light beam disposed in an interference relationship with a paper path, the light beam providing a plurality of crossings of the paper path and including a light emitter, a light detector disposed at the end of the light beam path, the light detector responsive to light projected along the light beam path to provide a signal, the signal providing an indication of the presence or absence of a sheet in the light beam path, and an optical fiber providing a portion of the light beam path for redirecting the light beam across the paper path. The light beam is projected at an angle with respect to the paper path, the angle being at least 10 degrees from the perpendicular to the paper path.
|
