| 摘要 |
<p>A scanner powered by the limited power available on a peripheral bus (34) can operate within the 2.2 watts provided over a USB connector. The scanner uses a CIS sensor (100) which uses optics to distribute light from each light emitter to multiple pixel positions, using a single LED for each color. An electric motor (220) for driving the platen uses rare earth magnets to limit the power required. Instead of the traditional method of biasing the CIS scanner against the platen with a spring, the platen itself (210) is spring-biased (240). The helical thread of the worm gear has a single point of contact with a gear on the platen, further limiting the friction and allowing the platen to move up and down with respect to the stationary motor.</p> |
