US 7,746,513 B2 · Scanner and method thereof

Abstract

A scanner including a light source, an optical module, a driving device, and a control unit is provided. The light source emits a light beam to the to-be-scanned document. The optical module includes a photo sensing device for receiving the light beam reflected by the to-be-scanned document. The driving device includes a position detecting device, for detecting a position of the optical module relative to the to-be-scanned document, and outputting a position feedback signal accordingly. The control unit includes a light source controller and a timer. The scanning method includes the steps of setting the value of K to 1; moving the optical module to read the Kth scan line and adjusting the luminance of the light source to compensate exposure level of the (K+1)th scan line; and determining if K is smaller than N.

Claims16

Dependent claims

A scanner, comprising:

a light source, for emitting a light beam to a to-be-scanned document;
an optical module, comprising a photo sensing device for receiving the light beam reflected by the to-be-scanned document, for reading a plurality of scan lines of the to-be-scanned document;
a driving device for generating a relative movement between the optical module and the to-be-scanned document, wherein the driving device comprises a position detecting device for detecting a position of the optical module relative to the to-be-scanned document and outputting a position feedback signal accordingly;
and
a control unit, comprising a light source controller for controlling the luminance of the light source, and a timer for controlling the light source controller according to the position feedback signal, so that exposure level for each of the scan lines remains the same.

2 more elements

A scanning method for a scanner, for scanning a to-be-scanned document, the method comprising:

emitting a light beam to the to-be-scanned document by a light source;
receiving the light beam reflected by the to-be-scanned document by a photo sensing device of an optical module;
reading the N scan lines of the to-be-scanned document where N is a natural number by the photo sensing device;
generating a relative movement between the optical module and the to-be-scanned document and outputting a position feedback signal according to a position of the optical module relative to the to-be-scanned document by a driving device;
setting a K value to 1;
reading a Kth scan line of the to-be-scanned document by the photo sensing device;
obtaining Kth exposure time for the Kth scan line by a timer;
adjusting the luminance of the light source according to the Kth exposure time to compensate exposure level for a (K+1)th scan line by a light source controller;
and
increasing K by 1 if the value of K is smaller than N and returning to the step of reading the Kth scan line of the to-be-scanned document by the control unit.

7 more elements

Dependencies are inferred from the claim text.

Scanner and method thereof

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Scanner and method thereof

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Abstract

Claims16