Scanner which takes samples from different positions of a document to increase its resolution

A scanning device comprising:

• a housing having a transparent platform installed on its top for placing a document;
• a scanning module installed inside the housing slidable along a front-and-rear direction for scanning the document, the scanning module comprising:
• a carrier;
• a sensor installed inside the carrier slidable along a left-right direction, the sensor comprising a plurality of sensing units linearly arranged along a left-right direction for taking image samples of the document;
• and
• a positioning device for fixing the sensor inside the carrier;
• and
• a driving device for driving the scanning module forward and backward to scan the document;
• wherein when the scanning module scans the document along the front-and-rear direction, the positioning device fixes the plurality of sensing units of the sensor at non-repeating sampling positions inside the carrier such that the position of each sensing unit inside the carrier in a forward pass is different from that in a backward pass so as to increase the resolution of the sensor.

A scanning device comprising:

• a housing having a transparent platform installed on its top for placing a document;
• a scanning module installed inside the housing slidable along a front-and-rear direction for scanning the document, the scanning module comprising:
• a carrier;
• a sensor installed inside the carrier slidable along a left-right direction, the sensor comprising a plurality of sensing units linearly arranged along a left-right direction for taking image samples of the document;
• and
• a positioning device for fixing the sensor inside the carrier;
• and
• a driving device for driving the scanning module forward and backward to scan the document;
• wherein when the scanning module scans the document along the front-and-rear direction, the positioning device fixes the plurality of sensing units of the sensor at non-repeating sampling positions inside the carrier such that the position of each sensing unit inside the carrier alternates along a left-right direction as the scanning module moves along the front-and-rear direction step by step so as to increase the resolution of the sensor.