Mustek Systems Inc.

Albert Lu

Jenn-Tsair Tsai

Emmet Chen

The present invention provides a scanning device. The scanning device comprises a document plate for placing a document, at least a sliding guide placed at one side of the document plate, a scanning module which is in front of the document plate for scanning the document along the direction of the sliding guide, a first light source assembled in the scanning module for providing light to scan documents, and a driving module electrically connected to the scanning module for driving the scanning module to perform scanning procedure to the document.

Apparatus for scanning documents in front of a document plate

Before assembling a scanning module, the type of the scanning module is predetermined. When the scanning module is predetermined, the shape of MTF-DF curve is therefore fixed. The scanning module includes a glass plate, lens and an image generating means. During the assembly, the image generating means and the glass plate are mounted. A correction document is placed on the glass plate. The position of the lens is adjusted in order to reflect a point at the lowest point of the tolerant range of the depth of scanning field in the MTF-DF curve. The position of the lens is then fixed. An increased depth of scanning field in a scanning device is thusly obtained.

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Shinchu, Taiwan

Albert Lu