| 摘要 |
An image scanner employs sliding elements to keep a regular depth of field between a scanning module and a scanned object. The image scanner comprises a housing, a scanning plate for holding scanned object, a plurality of sliding elements, a movable carriage, a scanning module and a driving device. The sliding elements pinch at the both sides of scanning plate and slide freely lengthwise along the scanning plate and the carriage is fixed at the sliding elements. Because the scanning plate is the same reference base for both carriage and scanned object, it is easy to keep the regular distance between carriage and scanned object.
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