Patent ID: 7564597

Claim:
An image sensor mounted in an image scanning device to expose and read a plurality of scan lines of a to-be-scanned document, the image scanning device comprising a motor for driving the image sensor to move relative to the to-be-scanned document along a specific axis, the image sensor comprising: P red-light photosensors; P green-light photosensors; and P blue-light photosensors, wherein: P is a positive integer, P≧2; when the image sensor acquires a colored image of the to-be-scanned document, the P red-light photosensors, the P green-light photosensors and the P blue-light photosensors read 3P adjacent scan lines respectively in each exposure; the image sensor reads 3P corresponding adjacent scan lines in each step of the motor, where the motor moves the image sensor by P scan lines relative to the to-be-scanned document along the specific axis, and continues reading until all the scan lines have been read.